TY  - JOUR
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Mladenović, Mladen
AU  - Savić, Zoran
AU  - Grabulov, Vencislav
AU  - Radosavljević, Zoran
AU  - Rakin, Marko
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/381
AB  - Topic of this work is the integrity assessment of the pipeline section from hydropower plant Pirot. Crack-like defect size, maximum depth, is determined based on non-destructive evaluation - the largest crack depth is taken as the initial value for load carrying capacity estimation. Also, the crack dimensions (both length and depth) are varied. Limit pressure values are determined from 3D and 2D models of pipes with axial cracks on external surface. The influence of tensile loading on the load carrying capacity of the pipes with circumferential cracks is also examined. Integrity of pipes with both types of defects (axial and circumferential) is assessed through application of FAD diagrams.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'
EP  - 86
IS  - 1
SP  - 82
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4567
ER  - 

@article{
author = "Međo, Bojan and Arsić, Miodrag and Mladenović, Mladen and Savić, Zoran and Grabulov, Vencislav and Radosavljević, Zoran and Rakin, Marko",
year = "2020",
abstract = "Topic of this work is the integrity assessment of the pipeline section from hydropower plant Pirot. Crack-like defect size, maximum depth, is determined based on non-destructive evaluation - the largest crack depth is taken as the initial value for load carrying capacity estimation. Also, the crack dimensions (both length and depth) are varied. Limit pressure values are determined from 3D and 2D models of pipes with axial cracks on external surface. The influence of tensile loading on the load carrying capacity of the pipes with circumferential cracks is also examined. Integrity of pipes with both types of defects (axial and circumferential) is assessed through application of FAD diagrams.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'",
pages = "86-82",
number = "1",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4567"
}

Međo, B., Arsić, M., Mladenović, M., Savić, Z., Grabulov, V., Radosavljević, Z.,& Rakin, M.. (2020). Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 20(1), 82-86.
https://hdl.handle.net/21.15107/rcub_technorep_4567

Međo B, Arsić M, Mladenović M, Savić Z, Grabulov V, Radosavljević Z, Rakin M. Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'. in Structural Integrity and Life. 2020;20(1):82-86.
https://hdl.handle.net/21.15107/rcub_technorep_4567 .

Međo, Bojan, Arsić, Miodrag, Mladenović, Mladen, Savić, Zoran, Grabulov, Vencislav, Radosavljević, Zoran, Rakin, Marko, "Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'" in Structural Integrity and Life, 20, no. 1 (2020):82-86,
https://hdl.handle.net/21.15107/rcub_technorep_4567 .

TY  - JOUR
AU  - Dramicanin, M.
AU  - Balos, Sebastian
AU  - Janjatović, P.
AU  - Zabunov, I
AU  - Grabulov, Vencislav
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/358
AB  - In this work, the presence of TiO2 nanoparticle-based activated flux combined with orbital welding of seamless thick-walled pipes of stainless steel and low-cycle pulse current was done, representing a novel combination of welding processes parameters. Control specimens were welded without flux and consumable material, and without flux with the consumable material. Experimental welding with different welding parameters was done. Special attention was given to characterize the flux by zetasizer method, representing a new approach, versus the conventional approach where the nominal oxide particle size is reported. The obtained welds were visually tested, macroanalyzed, their microstructures examined, and their tensile and bending properties determined. The results show that the flux influences a significant increase in penetration depth, up to full penetration, which has a positive effect on the increase in the tensile and bending properties of the weld metal. Material beahvior model was developed, based on microstructural features of the near weld-line. Without the flux, grain enlargement occurred near the surface, while with flux, it occurred under the weld, which can be attributed to recrystallization and a reversed Marangoni convection.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Activated flux tig welding of stainless-steel pipes
EP  - 360
IS  - 4
SP  - 353
VL  - 25
DO  - 10.2298/CICEQ181229013D
ER  - 

@article{
author = "Dramicanin, M. and Balos, Sebastian and Janjatović, P. and Zabunov, I and Grabulov, Vencislav",
year = "2019",
abstract = "In this work, the presence of TiO2 nanoparticle-based activated flux combined with orbital welding of seamless thick-walled pipes of stainless steel and low-cycle pulse current was done, representing a novel combination of welding processes parameters. Control specimens were welded without flux and consumable material, and without flux with the consumable material. Experimental welding with different welding parameters was done. Special attention was given to characterize the flux by zetasizer method, representing a new approach, versus the conventional approach where the nominal oxide particle size is reported. The obtained welds were visually tested, macroanalyzed, their microstructures examined, and their tensile and bending properties determined. The results show that the flux influences a significant increase in penetration depth, up to full penetration, which has a positive effect on the increase in the tensile and bending properties of the weld metal. Material beahvior model was developed, based on microstructural features of the near weld-line. Without the flux, grain enlargement occurred near the surface, while with flux, it occurred under the weld, which can be attributed to recrystallization and a reversed Marangoni convection.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Activated flux tig welding of stainless-steel pipes",
pages = "360-353",
number = "4",
volume = "25",
doi = "10.2298/CICEQ181229013D"
}

Dramicanin, M., Balos, S., Janjatović, P., Zabunov, I.,& Grabulov, V.. (2019). Activated flux tig welding of stainless-steel pipes. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Savez hemijskih inženjera, Beograd., 25(4), 353-360.
https://doi.org/10.2298/CICEQ181229013D

Dramicanin M, Balos S, Janjatović P, Zabunov I, Grabulov V. Activated flux tig welding of stainless-steel pipes. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2019;25(4):353-360.
doi:10.2298/CICEQ181229013D .

Dramicanin, M., Balos, Sebastian, Janjatović, P., Zabunov, I, Grabulov, Vencislav, "Activated flux tig welding of stainless-steel pipes" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 25, no. 4 (2019):353-360,
https://doi.org/10.2298/CICEQ181229013D . .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Grabulov, Vencislav
AU  - Mladenović, Mladen
AU  - Savić, Zoran
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/339
AB  - Hidroelektrana Pirot, koja je izgrađena 1990 godine, je akumulaciona elektrana derivacionog tipa, koja se sastoji od dva nadzemna vertikalna agregata sa Francis turbinama nominalne snage 41,5 MW, proizvedene u Češkoj Republici, tunela i ukopanog cevovoda ukupne dužine 2030 m i prečnika od O 3000 mm do O 3500 mm. Cevovod debljine lima 22 mm je izrađen od čelika kvaliteta S275J2G3 (stara oznaka Č.0462). Maksimalni pritisak u njemu ispred turbinskog zatvarača je 2,5 MP. Na cevovodu se u kontinuitetu od završetka izgradnje i puštanja u rad sprovode geodetska merenja kada je cevovod prazan i neopterećen hidrostatičkim pritiskom i kada je cevovod pun. Pregledom i analizom dobijenih podataka o pomeranjima duž trase cevovoda utvrđeno je da od 2003-2004 godine postoje znatno veće razlike u pomeranjima za pun i prazan cevovod, nego u prethodnom periodu. U radu je izvršena analiza trenutnog stanja i ocena čvrstoče cevovoda kao celine na osnovu rezultata ispitivanja sučeonih zavarenih spojeva i ukrsnih masta metodama bez razaranja u zoni preloma na stacionaži - dužini cevovoda 1+263m (vizuelno ispitivanje, ispitivanje magnetnim česticama, ispitivanje penetrantima, ispitivanje ultrazvukom, radiografsko ispitivanje, metalografsko ispitivanje metodom replika).
AB  - Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regarding the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period. This paper contains the analysis of current state and strength evaluation of the pipeline as a whole on the basis of results of non-destructive tests performed on the vital butt - welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing).
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Analiza trenutnog stanja i ocena čvrstoće cevovoda na hidroelektrani Pirot
T1  - Analysis of current state and strength evaluation of the pipeline at hydro power plant 'Pirot'
EP  - 22
IS  - 1
SP  - 17
VL  - 63
DO  - 10.5937/zzk1801017A
ER  - 

@article{
author = "Arsić, Miodrag and Grabulov, Vencislav and Mladenović, Mladen and Savić, Zoran",
year = "2018",
abstract = "Hidroelektrana Pirot, koja je izgrađena 1990 godine, je akumulaciona elektrana derivacionog tipa, koja se sastoji od dva nadzemna vertikalna agregata sa Francis turbinama nominalne snage 41,5 MW, proizvedene u Češkoj Republici, tunela i ukopanog cevovoda ukupne dužine 2030 m i prečnika od O 3000 mm do O 3500 mm. Cevovod debljine lima 22 mm je izrađen od čelika kvaliteta S275J2G3 (stara oznaka Č.0462). Maksimalni pritisak u njemu ispred turbinskog zatvarača je 2,5 MP. Na cevovodu se u kontinuitetu od završetka izgradnje i puštanja u rad sprovode geodetska merenja kada je cevovod prazan i neopterećen hidrostatičkim pritiskom i kada je cevovod pun. Pregledom i analizom dobijenih podataka o pomeranjima duž trase cevovoda utvrđeno je da od 2003-2004 godine postoje znatno veće razlike u pomeranjima za pun i prazan cevovod, nego u prethodnom periodu. U radu je izvršena analiza trenutnog stanja i ocena čvrstoče cevovoda kao celine na osnovu rezultata ispitivanja sučeonih zavarenih spojeva i ukrsnih masta metodama bez razaranja u zoni preloma na stacionaži - dužini cevovoda 1+263m (vizuelno ispitivanje, ispitivanje magnetnim česticama, ispitivanje penetrantima, ispitivanje ultrazvukom, radiografsko ispitivanje, metalografsko ispitivanje metodom replika)., Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regarding the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period. This paper contains the analysis of current state and strength evaluation of the pipeline as a whole on the basis of results of non-destructive tests performed on the vital butt - welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing).",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Analiza trenutnog stanja i ocena čvrstoće cevovoda na hidroelektrani Pirot, Analysis of current state and strength evaluation of the pipeline at hydro power plant 'Pirot'",
pages = "22-17",
number = "1",
volume = "63",
doi = "10.5937/zzk1801017A"
}

Arsić, M., Grabulov, V., Mladenović, M.,& Savić, Z.. (2018). Analiza trenutnog stanja i ocena čvrstoće cevovoda na hidroelektrani Pirot. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 63(1), 17-22.
https://doi.org/10.5937/zzk1801017A

Arsić M, Grabulov V, Mladenović M, Savić Z. Analiza trenutnog stanja i ocena čvrstoće cevovoda na hidroelektrani Pirot. in Zavarivanje i zavarene konstrukcije. 2018;63(1):17-22.
doi:10.5937/zzk1801017A .

Arsić, Miodrag, Grabulov, Vencislav, Mladenović, Mladen, Savić, Zoran, "Analiza trenutnog stanja i ocena čvrstoće cevovoda na hidroelektrani Pirot" in Zavarivanje i zavarene konstrukcije, 63, no. 1 (2018):17-22,
https://doi.org/10.5937/zzk1801017A . .

TY  - JOUR
AU  - Burzić, Zijah
AU  - Burzić, Meri
AU  - Grabulov, Vencislav
AU  - Perković, Srđa
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/328
AB  - Primena čelika visoke čvrstoće kod projektovanja zavarenih konstrukcija zahteva podatke o svojstvima istih pri različitim uslovima opterećenja. Zahvaljujući visokom naponu tečenja debljina zida može se smanjiti u poređenju sa opštim konstrukcijskim čelicima, a shodno tome, dimenzije zavarenog spoja, potrošnja dodatnog materijala za zavarivanje i vreme za izradu zavarenih spojeva će biti minimizirani. Ovo je od značaja za opremu pod pritiskom, ali i za druge industrijske grane (kranove, bagere). Kompletna karakterizacija zavarenog spoja mora uključiti podatke za osnovni metal, ali takođe su neophodne osobine metala šava i zone uticaja toplote (ZUT), bar da bi ih uporedili sa svojstvima osnovnog metala. Ovo je od posebnog značaja zbog heterogenosti strukture u ZUT-u. .
AB  - The application of high strength steels in design of heavy duty welded structures requires data about properties in different loading conditions. Thanks to high yield stress the wall thickness can be reduced compared to mild structural steels, and accordingly welded joint cross-sections, welding consumables consumption and time for welded joints manufacturing will be minimized. This is of importance for pressurized equipment, but also for other industrial branches (cranes, excavator). Complete characterization of welded joint has to include data for parent metal, but also the properties for weld metal and the heat-affected-zone (HAZ) are necessary, at least in order to compare them with parent metal properties. This is of special importance because of heterogeneity structure in HAZ.
PB  - Vojnotehnički institut, Beograd
T2  - Scientific Technical Review
T1  - Uticaj prsline na karakteristike zavarenog spoja pri različitim vrstama opterećenja
T1  - Influence of crack on welded joint characteristics in different types of loads
EP  - 58
IS  - 1
SP  - 50
VL  - 68
DO  - 10.5937/str1801050B
ER  - 

@article{
author = "Burzić, Zijah and Burzić, Meri and Grabulov, Vencislav and Perković, Srđa",
year = "2018",
abstract = "Primena čelika visoke čvrstoće kod projektovanja zavarenih konstrukcija zahteva podatke o svojstvima istih pri različitim uslovima opterećenja. Zahvaljujući visokom naponu tečenja debljina zida može se smanjiti u poređenju sa opštim konstrukcijskim čelicima, a shodno tome, dimenzije zavarenog spoja, potrošnja dodatnog materijala za zavarivanje i vreme za izradu zavarenih spojeva će biti minimizirani. Ovo je od značaja za opremu pod pritiskom, ali i za druge industrijske grane (kranove, bagere). Kompletna karakterizacija zavarenog spoja mora uključiti podatke za osnovni metal, ali takođe su neophodne osobine metala šava i zone uticaja toplote (ZUT), bar da bi ih uporedili sa svojstvima osnovnog metala. Ovo je od posebnog značaja zbog heterogenosti strukture u ZUT-u. ., The application of high strength steels in design of heavy duty welded structures requires data about properties in different loading conditions. Thanks to high yield stress the wall thickness can be reduced compared to mild structural steels, and accordingly welded joint cross-sections, welding consumables consumption and time for welded joints manufacturing will be minimized. This is of importance for pressurized equipment, but also for other industrial branches (cranes, excavator). Complete characterization of welded joint has to include data for parent metal, but also the properties for weld metal and the heat-affected-zone (HAZ) are necessary, at least in order to compare them with parent metal properties. This is of special importance because of heterogeneity structure in HAZ.",
publisher = "Vojnotehnički institut, Beograd",
journal = "Scientific Technical Review",
title = "Uticaj prsline na karakteristike zavarenog spoja pri različitim vrstama opterećenja, Influence of crack on welded joint characteristics in different types of loads",
pages = "58-50",
number = "1",
volume = "68",
doi = "10.5937/str1801050B"
}

Burzić, Z., Burzić, M., Grabulov, V.,& Perković, S.. (2018). Uticaj prsline na karakteristike zavarenog spoja pri različitim vrstama opterećenja. in Scientific Technical Review
Vojnotehnički institut, Beograd., 68(1), 50-58.
https://doi.org/10.5937/str1801050B

Burzić Z, Burzić M, Grabulov V, Perković S. Uticaj prsline na karakteristike zavarenog spoja pri različitim vrstama opterećenja. in Scientific Technical Review. 2018;68(1):50-58.
doi:10.5937/str1801050B .

Burzić, Zijah, Burzić, Meri, Grabulov, Vencislav, Perković, Srđa, "Uticaj prsline na karakteristike zavarenog spoja pri različitim vrstama opterećenja" in Scientific Technical Review, 68, no. 1 (2018):50-58,
https://doi.org/10.5937/str1801050B . .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
PY  - 2017
UR  - http://rims.institutims.rs/handle/123456789/318
AB  - U radu su predstavljeni rezultati strukturnih i mehaničkih ispitivanja sučeonih spojeva raznorodnih aluminijumskih legura AlCu4,5Mg (AA2024) i AlMg4,5Mn (AA5083) zavarenih postupkom FSW. Primenom optimizovang alata za zavarivanje, spojene su ploče debljine 6 mm. Međusobni položaj ploča u spoju je variran tako da je u prvom slučaju ploča od AA2024 pozicionirana na strani napredovanja a ploča od AA5083 na povratnoj strani spoja. U drugom slučaju položaj ploča je bio obrnut. Korišćeni su sledeći parametri zavarivanja: brzina rotacije alata nije menjana i iznosila je 750 obr/min a brzina zavarivanja iznosila je 73 i 93 mm/min. Dobijeni su spojevi bez prisustva grešaka i sa glatkom odnosno prihvatljivo ravnom površinom spoja. Analiziran je uticaj parametra zavarivanja na dobijenu strukturu i mehanička svojstva spoja. Oblik grumena i u njemu prisutnih koncentričnih krugova, zavisi od brzine zavarivanja i položaja ploča u spoju. Do loma uvek dolazi na strani spoja gde je pozicionirana ploča od legure AA5083. Karakteristično je da se lom uvek dešava na rastojanju od oko 21 mm od centra spoja.
AB  - In this work, the structural and mechanical properties of friction stir welded dissimilar butt joints of AA2024-T351 to AA5083-H112 aluminum alloys were evaluated. Plates of 6 mm thick were friction stir welded with optimized tool. In the first case, plate of AA2024 was positioned on the advancing and plate of AA5083 was on the retreating side of the weld. In second case, position of the plate was opposite. Specimens were welded using rotation rate of 750 rpm and welding speed of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface. The effects of rotation and lateral speed of the welding tool were related to structural features and mechanical properties. The structural appearances of concentric rings in the nugget zone were controlled by tool speed and plate position. Structural analysis of the joint cross-section, revealed the distinct lamellar bands. The joints consistently failed on the AA5083 aluminum alloy plate. Failures were observed through the heat-affected zone at distance of approximately 21 mm from weld center.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom
T1  - Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys
EP  - 18
IS  - 1
SP  - 11
VL  - 62
DO  - 10.5937/zzk1701011R
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Radović, Nenad and Grabulov, Vencislav",
year = "2017",
abstract = "U radu su predstavljeni rezultati strukturnih i mehaničkih ispitivanja sučeonih spojeva raznorodnih aluminijumskih legura AlCu4,5Mg (AA2024) i AlMg4,5Mn (AA5083) zavarenih postupkom FSW. Primenom optimizovang alata za zavarivanje, spojene su ploče debljine 6 mm. Međusobni položaj ploča u spoju je variran tako da je u prvom slučaju ploča od AA2024 pozicionirana na strani napredovanja a ploča od AA5083 na povratnoj strani spoja. U drugom slučaju položaj ploča je bio obrnut. Korišćeni su sledeći parametri zavarivanja: brzina rotacije alata nije menjana i iznosila je 750 obr/min a brzina zavarivanja iznosila je 73 i 93 mm/min. Dobijeni su spojevi bez prisustva grešaka i sa glatkom odnosno prihvatljivo ravnom površinom spoja. Analiziran je uticaj parametra zavarivanja na dobijenu strukturu i mehanička svojstva spoja. Oblik grumena i u njemu prisutnih koncentričnih krugova, zavisi od brzine zavarivanja i položaja ploča u spoju. Do loma uvek dolazi na strani spoja gde je pozicionirana ploča od legure AA5083. Karakteristično je da se lom uvek dešava na rastojanju od oko 21 mm od centra spoja., In this work, the structural and mechanical properties of friction stir welded dissimilar butt joints of AA2024-T351 to AA5083-H112 aluminum alloys were evaluated. Plates of 6 mm thick were friction stir welded with optimized tool. In the first case, plate of AA2024 was positioned on the advancing and plate of AA5083 was on the retreating side of the weld. In second case, position of the plate was opposite. Specimens were welded using rotation rate of 750 rpm and welding speed of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface. The effects of rotation and lateral speed of the welding tool were related to structural features and mechanical properties. The structural appearances of concentric rings in the nugget zone were controlled by tool speed and plate position. Structural analysis of the joint cross-section, revealed the distinct lamellar bands. The joints consistently failed on the AA5083 aluminum alloy plate. Failures were observed through the heat-affected zone at distance of approximately 21 mm from weld center.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom, Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys",
pages = "18-11",
number = "1",
volume = "62",
doi = "10.5937/zzk1701011R"
}

Radisavljević, I., Živković, A., Radović, N.,& Grabulov, V.. (2017). Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 62(1), 11-18.
https://doi.org/10.5937/zzk1701011R

Radisavljević I, Živković A, Radović N, Grabulov V. Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom. in Zavarivanje i zavarene konstrukcije. 2017;62(1):11-18.
doi:10.5937/zzk1701011R .

Radisavljević, Igor, Živković, Aleksandar, Radović, Nenad, Grabulov, Vencislav, "Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom" in Zavarivanje i zavarene konstrukcije, 62, no. 1 (2017):11-18,
https://doi.org/10.5937/zzk1701011R . .

TY  - CONF
AU  - Grabulov, Vencislav
PY  - 2017
UR  - http://rims.institutims.rs/handle/123456789/311
AB  - Development of fracture mechanics and structural integrity in South East Europe has been presented and analysed. As the starting point, the Magister thesis of Prof. Stojan Sedmak, 48 years ago (1968), has been taken, followed by his Doctoral thesis and some of the most important achievements afterwards, including International Fracture Mechanics Summer Schools and USA-ExYu project "Weldment Fracture Mechanics".
PB  - Springer-Verlag Berlin, Berlin
C3  - Fracture at all Scales
T1  - 48 Years of Fracture Mechanics and Structural Integrity in South East Europe
EP  - 17
SP  - 1
DO  - 10.1007/978-3-319-32634-4_1
ER  - 

@conference{
author = "Grabulov, Vencislav",
year = "2017",
abstract = "Development of fracture mechanics and structural integrity in South East Europe has been presented and analysed. As the starting point, the Magister thesis of Prof. Stojan Sedmak, 48 years ago (1968), has been taken, followed by his Doctoral thesis and some of the most important achievements afterwards, including International Fracture Mechanics Summer Schools and USA-ExYu project "Weldment Fracture Mechanics".",
publisher = "Springer-Verlag Berlin, Berlin",
journal = "Fracture at all Scales",
title = "48 Years of Fracture Mechanics and Structural Integrity in South East Europe",
pages = "17-1",
doi = "10.1007/978-3-319-32634-4_1"
}

Grabulov, V.. (2017). 48 Years of Fracture Mechanics and Structural Integrity in South East Europe. in Fracture at all Scales
Springer-Verlag Berlin, Berlin., 1-17.
https://doi.org/10.1007/978-3-319-32634-4_1

Grabulov V. 48 Years of Fracture Mechanics and Structural Integrity in South East Europe. in Fracture at all Scales. 2017;:1-17.
doi:10.1007/978-3-319-32634-4_1 .

Grabulov, Vencislav, "48 Years of Fracture Mechanics and Structural Integrity in South East Europe" in Fracture at all Scales (2017):1-17,
https://doi.org/10.1007/978-3-319-32634-4_1 . .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Grabulov, Vencislav
AU  - Radović, Nenad
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/282
AB  - U radu je ispitivano kakav zajednički, kombinovani uticaj brzina rotacije alata, brzina zavarivanja i mala promena u geometriji trna alata imaju na zavarljivost, mehaničke i strukturne karakteristike sučeonog spoja Al legure 2024-T351 zavarene primenom FSW (zavarivanje trenjem alatom) postupka zavarivanja. Zavarivane su ploče dimenzija 260 mm×65 mm×6 mm. Ploče su pre zavarivanja mašinski obrađene i kruto stegnute za potpornu ploču. Zavarivanje je izvedeno u pravcu valjanja ploča, na alatnoj glodalici prilagođenoj postupku FSW. Dužina svakog zavarenog spoja iznosila je oko 210 mm. Korišćena su dva alata sa veoma slično profilisanim trnovima. Razlika u dizajnu trna alata je u obliku zavojnice, normalna (klasična) kod alata oznake 310 odnosno zaobljena za alat 310-O. Zavarivanje je izvedeno pri brzini rotacije alata od 750 o/min i brzinama zavarivanja 73 i 93 mm/min. Ukupno su zavarene četiri kombinacije spojeva. U svim slučajevima dobijen je zavareni spoj bez prisustva grešaka, sa glatkom odnosno delimično hrapavom površinom zavara. Prisutne su tri različite oblasti u spoju - grumen, zona termomehaničkog uticaja i zona uticaja toplote. Promene u dizajnu trna alata imaju znatnog uticaja na makrostrukturu spoja i raspodelu tvrdoće kroz spoj. Mapiranjem spoja, na osnovu raspodele tvrdoće, određene su oblasti sa najnižim vrednostima tvrdoće a nalaze se u neposrednoj blizini grumena, tačnije na liniji dodira grumena i zone termomehaničkog uticaja. Položaj oblasti najmanje tvrdoće je u saglasnosti sa mestom preloma zateznih epruveta. Efikasnost spoja, kao ocena kvaliteta spoja, je veća kod spojeva zavarenih alatom 310. U zavisnosti od alata, pri istim parametrima zavarivanja dobijene su različite vrednosti zateznih čvrstoća a razlika iznosi do 13%. Pokazano je da mala modifikacija u dizajnu trna alata ima velikog uticaja na formiranje spoja i njegove mehaničke karakteristike.
AB  - The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface, in all four cases. Modification in pin design showed strong influence on macro structure and hardness distribution. Weak places are identified as low hardness zone, close to the nugget zone and are in good agreement with fracture location in tensile testing. Weld efficiency, as a measure of weld quality, is better in case of 310 tool, while UTS values can differ up to 13% for the equal welding parameters. Therefore, it can be assumed that small modification in tool design, particularly in pin geometry, can have great influence on weld formation and mechanical properties.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW
T1  - Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy
EP  - 330
IS  - 3
SP  - 323
VL  - 69
DO  - 10.2298/HEMIND131206020R
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Grabulov, Vencislav and Radović, Nenad",
year = "2015",
abstract = "U radu je ispitivano kakav zajednički, kombinovani uticaj brzina rotacije alata, brzina zavarivanja i mala promena u geometriji trna alata imaju na zavarljivost, mehaničke i strukturne karakteristike sučeonog spoja Al legure 2024-T351 zavarene primenom FSW (zavarivanje trenjem alatom) postupka zavarivanja. Zavarivane su ploče dimenzija 260 mm×65 mm×6 mm. Ploče su pre zavarivanja mašinski obrađene i kruto stegnute za potpornu ploču. Zavarivanje je izvedeno u pravcu valjanja ploča, na alatnoj glodalici prilagođenoj postupku FSW. Dužina svakog zavarenog spoja iznosila je oko 210 mm. Korišćena su dva alata sa veoma slično profilisanim trnovima. Razlika u dizajnu trna alata je u obliku zavojnice, normalna (klasična) kod alata oznake 310 odnosno zaobljena za alat 310-O. Zavarivanje je izvedeno pri brzini rotacije alata od 750 o/min i brzinama zavarivanja 73 i 93 mm/min. Ukupno su zavarene četiri kombinacije spojeva. U svim slučajevima dobijen je zavareni spoj bez prisustva grešaka, sa glatkom odnosno delimično hrapavom površinom zavara. Prisutne su tri različite oblasti u spoju - grumen, zona termomehaničkog uticaja i zona uticaja toplote. Promene u dizajnu trna alata imaju znatnog uticaja na makrostrukturu spoja i raspodelu tvrdoće kroz spoj. Mapiranjem spoja, na osnovu raspodele tvrdoće, određene su oblasti sa najnižim vrednostima tvrdoće a nalaze se u neposrednoj blizini grumena, tačnije na liniji dodira grumena i zone termomehaničkog uticaja. Položaj oblasti najmanje tvrdoće je u saglasnosti sa mestom preloma zateznih epruveta. Efikasnost spoja, kao ocena kvaliteta spoja, je veća kod spojeva zavarenih alatom 310. U zavisnosti od alata, pri istim parametrima zavarivanja dobijene su različite vrednosti zateznih čvrstoća a razlika iznosi do 13%. Pokazano je da mala modifikacija u dizajnu trna alata ima velikog uticaja na formiranje spoja i njegove mehaničke karakteristike., The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface, in all four cases. Modification in pin design showed strong influence on macro structure and hardness distribution. Weak places are identified as low hardness zone, close to the nugget zone and are in good agreement with fracture location in tensile testing. Weld efficiency, as a measure of weld quality, is better in case of 310 tool, while UTS values can differ up to 13% for the equal welding parameters. Therefore, it can be assumed that small modification in tool design, particularly in pin geometry, can have great influence on weld formation and mechanical properties.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW, Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy",
pages = "330-323",
number = "3",
volume = "69",
doi = "10.2298/HEMIND131206020R"
}

Radisavljević, I., Živković, A., Grabulov, V.,& Radović, N.. (2015). Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 69(3), 323-330.
https://doi.org/10.2298/HEMIND131206020R

Radisavljević I, Živković A, Grabulov V, Radović N. Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW. in Hemijska industrija. 2015;69(3):323-330.
doi:10.2298/HEMIND131206020R .

Radisavljević, Igor, Živković, Aleksandar, Grabulov, Vencislav, Radović, Nenad, "Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW" in Hemijska industrija, 69, no. 3 (2015):323-330,
https://doi.org/10.2298/HEMIND131206020R . .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Vistać, Brane
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Savić, Zoran
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/248
AB  - Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’. During the refurbishment of hydropower plant experimental non-destructive tests were performed in order to determine the state of turbine components. During the course of testing damage was detected at sleeves and welded shields of guide vanes, which occurred as a consequence of turbine shaft vibrations. 1782 mm long guide vane sleeves were made of cast steel 25L (GOST standard), 260 mm long sleeve was made of forged steel St 25 (GOST standard), while welded shields of guide vanes were made of austenitic steel 08X18H10T (GOST standard). Results of experimental tests and methodology for reparation of damaged surfaces of sleeves and welded shields of guide vanes are presented in this paper. It was necessary, due to the structural solution used for the design of guide vanes and their function during service, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of vanes through the use of reparation methodology for welding/surface welding of sleeves and welded shields. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.
PB  - Trans Tech Publications Ltd
C3  - Advanced Materials Research
T1  - Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1
EP  - 13
SP  - 8
VL  - 1029
DO  - 10.4028/www.scientific.net/AMR.1029.8
ER  - 

@conference{
author = "Arsić, Miodrag and Vistać, Brane and Bošnjak, Srđan and Grabulov, Vencislav and Savić, Zoran",
year = "2014",
abstract = "Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’. During the refurbishment of hydropower plant experimental non-destructive tests were performed in order to determine the state of turbine components. During the course of testing damage was detected at sleeves and welded shields of guide vanes, which occurred as a consequence of turbine shaft vibrations. 1782 mm long guide vane sleeves were made of cast steel 25L (GOST standard), 260 mm long sleeve was made of forged steel St 25 (GOST standard), while welded shields of guide vanes were made of austenitic steel 08X18H10T (GOST standard). Results of experimental tests and methodology for reparation of damaged surfaces of sleeves and welded shields of guide vanes are presented in this paper. It was necessary, due to the structural solution used for the design of guide vanes and their function during service, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of vanes through the use of reparation methodology for welding/surface welding of sleeves and welded shields. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.",
publisher = "Trans Tech Publications Ltd",
journal = "Advanced Materials Research",
title = "Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1",
pages = "13-8",
volume = "1029",
doi = "10.4028/www.scientific.net/AMR.1029.8"
}

Arsić, M., Vistać, B., Bošnjak, S., Grabulov, V.,& Savić, Z.. (2014). Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1. in Advanced Materials Research
Trans Tech Publications Ltd., 1029, 8-13.
https://doi.org/10.4028/www.scientific.net/AMR.1029.8

Arsić M, Vistać B, Bošnjak S, Grabulov V, Savić Z. Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1. in Advanced Materials Research. 2014;1029:8-13.
doi:10.4028/www.scientific.net/AMR.1029.8 .

Arsić, Miodrag, Vistać, Brane, Bošnjak, Srđan, Grabulov, Vencislav, Savić, Zoran, "Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1" in Advanced Materials Research, 1029 (2014):8-13,
https://doi.org/10.4028/www.scientific.net/AMR.1029.8 . .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Veljović, Aleksandar
AU  - Savić, Zoran
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/238
AB  - Stable supply tank, with volume V = 250 m3 and operating pressure p = 1,5 MPa, of generation unit 6 at thermal power plant 'Nikola Tesla A' in Obrenovac, is designed for water-steam working fluid. It was made of steel Č 1204 as a single-part welded structure with a single wall. Cylindrical tank shell consists of 8 segments, while torispherical deep bottoms consist of 3 segments. The tank is in the horizontal position and it lays on 4 supports. There are five manometers installed at the tank for pressure control, as well as 5 spring-loaded safety valves. In this paper results of non-destructive tests performed on the tank are presented. Mechanical damages on parent material, up to 1.5 mm deep, were detected at the outer surface of the cylindrical section of the right bottom (as seen from the boiler) and on the inner surface of the shell, as well as sporadic pitting corrosion, up to 0.5 mm deep, and 2 mm misalignment of sheet metals in areas where shell segments are joined. Crack type linear indications were detected on the surface of welded joints through the use of magnetic particle testing. Through ultrasonic and radiographic testing it was determined that the homogeneity of welded joints is satisfactory. Hardness testing was performed on all segments of the tank, and obtained values were in the range between 118 and 130 HB. Metallographic examination, performed on specimens of all segments of the tank, showed that microstructure of material is either fine-grained or striped ferrite-pearlite. On the basis of test results the repair technology for shell and bottom segments was made, while on the basis of the analytical calculation of tank strength the integrity evaluation was carried out for the upcoming period of service, depending on the category of the vessel.
PB  - Trans Tech Publications Ltd
C3  - Advanced Materials Research
T1  - Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac
EP  - 19
SP  - 14
VL  - 1029
DO  - 10.4028/www.scientific.net/AMR.1029.14
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Veljović, Aleksandar and Savić, Zoran",
year = "2014",
abstract = "Stable supply tank, with volume V = 250 m3 and operating pressure p = 1,5 MPa, of generation unit 6 at thermal power plant 'Nikola Tesla A' in Obrenovac, is designed for water-steam working fluid. It was made of steel Č 1204 as a single-part welded structure with a single wall. Cylindrical tank shell consists of 8 segments, while torispherical deep bottoms consist of 3 segments. The tank is in the horizontal position and it lays on 4 supports. There are five manometers installed at the tank for pressure control, as well as 5 spring-loaded safety valves. In this paper results of non-destructive tests performed on the tank are presented. Mechanical damages on parent material, up to 1.5 mm deep, were detected at the outer surface of the cylindrical section of the right bottom (as seen from the boiler) and on the inner surface of the shell, as well as sporadic pitting corrosion, up to 0.5 mm deep, and 2 mm misalignment of sheet metals in areas where shell segments are joined. Crack type linear indications were detected on the surface of welded joints through the use of magnetic particle testing. Through ultrasonic and radiographic testing it was determined that the homogeneity of welded joints is satisfactory. Hardness testing was performed on all segments of the tank, and obtained values were in the range between 118 and 130 HB. Metallographic examination, performed on specimens of all segments of the tank, showed that microstructure of material is either fine-grained or striped ferrite-pearlite. On the basis of test results the repair technology for shell and bottom segments was made, while on the basis of the analytical calculation of tank strength the integrity evaluation was carried out for the upcoming period of service, depending on the category of the vessel.",
publisher = "Trans Tech Publications Ltd",
journal = "Advanced Materials Research",
title = "Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac",
pages = "19-14",
volume = "1029",
doi = "10.4028/www.scientific.net/AMR.1029.14"
}

Arsić, M., Bošnjak, S., Grabulov, V., Veljović, A.,& Savić, Z.. (2014). Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac. in Advanced Materials Research
Trans Tech Publications Ltd., 1029, 14-19.
https://doi.org/10.4028/www.scientific.net/AMR.1029.14

Arsić M, Bošnjak S, Grabulov V, Veljović A, Savić Z. Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac. in Advanced Materials Research. 2014;1029:14-19.
doi:10.4028/www.scientific.net/AMR.1029.14 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Veljović, Aleksandar, Savić, Zoran, "Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac" in Advanced Materials Research, 1029 (2014):14-19,
https://doi.org/10.4028/www.scientific.net/AMR.1029.14 . .

TY  - JOUR
AU  - Veljić, Darko M.
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Bajić, Nikola S.
AU  - Međo, Bojan
AU  - Bajić, Darko R.
AU  - Grabulov, Vencislav
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/237
AB  - This paper presents experimental and numerical analysis of the change of temperature and force in the vertical direction during the friction stir welding of high-strength aluminium alloy 2024 T3. This procedure confirmed the correctness of the numerical model, which is subsequently used for analysis of the temperature field in the welding zone, where it is different to determine the temperature experimentally. 3D finite element model is developed using the software package Abaqus; arbitrary Lagrangian-Eulerian formulation is applied. Johnson-Cook material law and Coulomb's Law of friction are used for modelling the material behaviour. Temperature fields are symmetrical with respect to the welding line. The temperature values below the tool shoulder, i.e. in the welding zone, which are reached during the plunge stage, are approximately constant during the entire welding process and lie within the interval 430-502 degrees C. The temperature of the material in the vicinity of the tool is about 500 degrees C, while the values on the top surface of the welding plates (outside the welding zone, but close to the tool shoulder) are about 400 degrees C. The temperature difference between the top and bottom surface of the plates is small, 10-15 degrees C.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy
EP  - S38
SP  - S29
VL  - 18
DO  - 10.2298/TSCI130512171V
ER  - 

@article{
author = "Veljić, Darko M. and Sedmak, Aleksandar and Rakin, Marko and Bajić, Nikola S. and Međo, Bojan and Bajić, Darko R. and Grabulov, Vencislav",
year = "2014",
abstract = "This paper presents experimental and numerical analysis of the change of temperature and force in the vertical direction during the friction stir welding of high-strength aluminium alloy 2024 T3. This procedure confirmed the correctness of the numerical model, which is subsequently used for analysis of the temperature field in the welding zone, where it is different to determine the temperature experimentally. 3D finite element model is developed using the software package Abaqus; arbitrary Lagrangian-Eulerian formulation is applied. Johnson-Cook material law and Coulomb's Law of friction are used for modelling the material behaviour. Temperature fields are symmetrical with respect to the welding line. The temperature values below the tool shoulder, i.e. in the welding zone, which are reached during the plunge stage, are approximately constant during the entire welding process and lie within the interval 430-502 degrees C. The temperature of the material in the vicinity of the tool is about 500 degrees C, while the values on the top surface of the welding plates (outside the welding zone, but close to the tool shoulder) are about 400 degrees C. The temperature difference between the top and bottom surface of the plates is small, 10-15 degrees C.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy",
pages = "S38-S29",
volume = "18",
doi = "10.2298/TSCI130512171V"
}

Veljić, D. M., Sedmak, A., Rakin, M., Bajić, N. S., Međo, B., Bajić, D. R.,& Grabulov, V.. (2014). Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S29-S38.
https://doi.org/10.2298/TSCI130512171V

Veljić DM, Sedmak A, Rakin M, Bajić NS, Međo B, Bajić DR, Grabulov V. Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy. in Thermal Science. 2014;18:S29-S38.
doi:10.2298/TSCI130512171V .

Veljić, Darko M., Sedmak, Aleksandar, Rakin, Marko, Bajić, Nikola S., Međo, Bojan, Bajić, Darko R., Grabulov, Vencislav, "Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy" in Thermal Science, 18 (2014):S29-S38,
https://doi.org/10.2298/TSCI130512171V . .

TY  - CONF
AU  - Odanović, Zoran
AU  - Arsić, Miodrag
AU  - Grabulov, Vencislav
AU  - Đurđević, Mile
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/215
AB  - Metal materials are subjected to innumerable time-dependent degradation mechanisms when operate in power, petrochemical and refinery plant. These materials are subjected to multiaxial stresses, creep, fatigue, corrosion and abrasion. As a result of service especially at high temperatures and high pressures, can lead to forming cracks, damages or failures. In situation of breakdown in such systems there is a need for weld repair on plant components and repair work can be expensive and time-consuming. Most weld repairs of low alloy steels require high-temperature post weld heat treatment (PWHT); but in certain repairs, however, this is not always possible. Expenses of the repair work could be reduced if the weld repairing is performed on site. Also, application of the nickel based filler metal can be alternative to performing PWHT. These repair welding procedures with Ni based filler metal could be categorized as cold repair welding. Purpose of presented investigation was to compare a repair welding technology with filler austenite material based on Ni and without application of the PWHT, with a classical repair welding procedure with preheating and PWHT and using a filler metal with chemical composition similar to parent metal. Properties comparison of the welded joints obtained by these two repair welding technologies was performed for the Cr-Mo steel (13CrMo4-5) by the metal arc welding procedure with covered electrode (MMA - 111). Weldability analysis by the analytical equations and technological tests for determination of the sensitivity to crack forming for cold and hot cracks by the CTS and Y tests, were performed for both repair welding technologies. Tensile tests, absorbed energies tests, banding tests and hardness measurements were performed on trial joins. Light optical microscopy (LOM) was applied for microstructure analysis. The fracture toughness of welded joints obtained by both investigated technologies, were estimated by the calculated stress intensity factor KIc and dynamic stress intensity factor KId for weld metal and heat affected zone. All of the obtained results were analyzed and discussed. It was concluded that repair welding technology with Ni base filler material without PWHT, enables welded joints without the appearance of cracks, with a good mechanical properties, slightly higher hardness in the HAZ, but with lower expenses compared to standard repair welding technology. In applying this technology in emergency welding repairing on-site, on the equipment and industrial facilities with high security requirements, inspection using non destructive technique has to be frequently applied compared to standard procedures.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Structural Integrity of Welded Structures
T1  - Investigation of the Repair Welding Technology Using Ni Base Electrode
EP  - 32
SP  - 25
VL  - 814
DO  - 10.4028/www.scientific.net/AMR.814.25
ER  - 

@conference{
author = "Odanović, Zoran and Arsić, Miodrag and Grabulov, Vencislav and Đurđević, Mile",
year = "2013",
abstract = "Metal materials are subjected to innumerable time-dependent degradation mechanisms when operate in power, petrochemical and refinery plant. These materials are subjected to multiaxial stresses, creep, fatigue, corrosion and abrasion. As a result of service especially at high temperatures and high pressures, can lead to forming cracks, damages or failures. In situation of breakdown in such systems there is a need for weld repair on plant components and repair work can be expensive and time-consuming. Most weld repairs of low alloy steels require high-temperature post weld heat treatment (PWHT); but in certain repairs, however, this is not always possible. Expenses of the repair work could be reduced if the weld repairing is performed on site. Also, application of the nickel based filler metal can be alternative to performing PWHT. These repair welding procedures with Ni based filler metal could be categorized as cold repair welding. Purpose of presented investigation was to compare a repair welding technology with filler austenite material based on Ni and without application of the PWHT, with a classical repair welding procedure with preheating and PWHT and using a filler metal with chemical composition similar to parent metal. Properties comparison of the welded joints obtained by these two repair welding technologies was performed for the Cr-Mo steel (13CrMo4-5) by the metal arc welding procedure with covered electrode (MMA - 111). Weldability analysis by the analytical equations and technological tests for determination of the sensitivity to crack forming for cold and hot cracks by the CTS and Y tests, were performed for both repair welding technologies. Tensile tests, absorbed energies tests, banding tests and hardness measurements were performed on trial joins. Light optical microscopy (LOM) was applied for microstructure analysis. The fracture toughness of welded joints obtained by both investigated technologies, were estimated by the calculated stress intensity factor KIc and dynamic stress intensity factor KId for weld metal and heat affected zone. All of the obtained results were analyzed and discussed. It was concluded that repair welding technology with Ni base filler material without PWHT, enables welded joints without the appearance of cracks, with a good mechanical properties, slightly higher hardness in the HAZ, but with lower expenses compared to standard repair welding technology. In applying this technology in emergency welding repairing on-site, on the equipment and industrial facilities with high security requirements, inspection using non destructive technique has to be frequently applied compared to standard procedures.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Structural Integrity of Welded Structures",
title = "Investigation of the Repair Welding Technology Using Ni Base Electrode",
pages = "32-25",
volume = "814",
doi = "10.4028/www.scientific.net/AMR.814.25"
}

Odanović, Z., Arsić, M., Grabulov, V.,& Đurđević, M.. (2013). Investigation of the Repair Welding Technology Using Ni Base Electrode. in Structural Integrity of Welded Structures
Trans Tech Publications Ltd, Durnten-Zurich., 814, 25-32.
https://doi.org/10.4028/www.scientific.net/AMR.814.25

Odanović Z, Arsić M, Grabulov V, Đurđević M. Investigation of the Repair Welding Technology Using Ni Base Electrode. in Structural Integrity of Welded Structures. 2013;814:25-32.
doi:10.4028/www.scientific.net/AMR.814.25 .

Odanović, Zoran, Arsić, Miodrag, Grabulov, Vencislav, Đurđević, Mile, "Investigation of the Repair Welding Technology Using Ni Base Electrode" in Structural Integrity of Welded Structures, 814 (2013):25-32,
https://doi.org/10.4028/www.scientific.net/AMR.814.25 . .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/204
AB  - The influence of R/v ratio on joint quality in 2024-T351 aluminum alloy was studied. Specimens were subjected to friction stir welding with the rotation rates of 750, 950 and 1180 r/min and welding speed between 73 and 190 mm/min, providing R/v ratio between 5.00 and 10.27. The welded joints were tested by means of both non-destructive (visual, penetrant and X-ray inspection) and destructive (metallographic, tension and hardness) testing. In all specimens typical zones are revealed, with corresponding differences in grain size. Tensile efficiency of the joints obtained is in the range of 52.2% to 82.3%. The results show that the best quality is obtained at R/v ratio of 8.06, 10.17 and 10.27. This behavior is attributed to the assumption that the material flows around the pin with an optimal speed, i.e. sufficient amount of material is available to fill the gap and prevent tunnel formation. R/v ratio also showed influence on hardness distribution, onion features and crack initiation/propagation zones.
PB  - Elsevier, Amsterdam
T2  - Transactions of Nonferrous Metals Society of China
T1  - Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints
EP  - 3539
IS  - 12
SP  - 3525
VL  - 23
DO  - 10.1016/S1003-6326(13)62897-6
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Radović, Nenad and Grabulov, Vencislav",
year = "2013",
abstract = "The influence of R/v ratio on joint quality in 2024-T351 aluminum alloy was studied. Specimens were subjected to friction stir welding with the rotation rates of 750, 950 and 1180 r/min and welding speed between 73 and 190 mm/min, providing R/v ratio between 5.00 and 10.27. The welded joints were tested by means of both non-destructive (visual, penetrant and X-ray inspection) and destructive (metallographic, tension and hardness) testing. In all specimens typical zones are revealed, with corresponding differences in grain size. Tensile efficiency of the joints obtained is in the range of 52.2% to 82.3%. The results show that the best quality is obtained at R/v ratio of 8.06, 10.17 and 10.27. This behavior is attributed to the assumption that the material flows around the pin with an optimal speed, i.e. sufficient amount of material is available to fill the gap and prevent tunnel formation. R/v ratio also showed influence on hardness distribution, onion features and crack initiation/propagation zones.",
publisher = "Elsevier, Amsterdam",
journal = "Transactions of Nonferrous Metals Society of China",
title = "Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints",
pages = "3539-3525",
number = "12",
volume = "23",
doi = "10.1016/S1003-6326(13)62897-6"
}

Radisavljević, I., Živković, A., Radović, N.,& Grabulov, V.. (2013). Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints. in Transactions of Nonferrous Metals Society of China
Elsevier, Amsterdam., 23(12), 3525-3539.
https://doi.org/10.1016/S1003-6326(13)62897-6

Radisavljević I, Živković A, Radović N, Grabulov V. Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints. in Transactions of Nonferrous Metals Society of China. 2013;23(12):3525-3539.
doi:10.1016/S1003-6326(13)62897-6 .

Radisavljević, Igor, Živković, Aleksandar, Radović, Nenad, Grabulov, Vencislav, "Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints" in Transactions of Nonferrous Metals Society of China, 23, no. 12 (2013):3525-3539,
https://doi.org/10.1016/S1003-6326(13)62897-6 . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Arsić, Miodrag
AU  - Međo, Bojan
AU  - Stefanović, Ana
AU  - Grabulov, Vencislav
AU  - Rakin, Marko
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/202
AB  - Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined.
PB  - Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
T2  - Tehnički vjesnik
T1  - Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure
EP  - 290
IS  - 2
SP  - 285
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2515
ER  - 

@article{
author = "Dimić, Ivana and Arsić, Miodrag and Međo, Bojan and Stefanović, Ana and Grabulov, Vencislav and Rakin, Marko",
year = "2013",
abstract = "Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined.",
publisher = "Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek",
journal = "Tehnički vjesnik",
title = "Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure",
pages = "290-285",
number = "2",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2515"
}

Dimić, I., Arsić, M., Međo, B., Stefanović, A., Grabulov, V.,& Rakin, M.. (2013). Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure. in Tehnički vjesnik
Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek., 20(2), 285-290.
https://hdl.handle.net/21.15107/rcub_technorep_2515

Dimić I, Arsić M, Međo B, Stefanović A, Grabulov V, Rakin M. Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure. in Tehnički vjesnik. 2013;20(2):285-290.
https://hdl.handle.net/21.15107/rcub_technorep_2515 .

Dimić, Ivana, Arsić, Miodrag, Međo, Bojan, Stefanović, Ana, Grabulov, Vencislav, Rakin, Marko, "Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure" in Tehnički vjesnik, 20, no. 2 (2013):285-290,
https://hdl.handle.net/21.15107/rcub_technorep_2515 .

TY  - JOUR
AU  - Sadibašić, Damir
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
AU  - Zrilić, Milorad
PY  - 2012
UR  - http://rims.institutims.rs/handle/123456789/185
AB  - U radu je ispitan uticaj stanja osnovnog metala na osobine REL zavarenog spoja čelika 14MoV 6 3. Zavarene su tri kombinacije uzoraka: (i) nekorišćen; (ii) korišćen-korišćen; i (iii) korišćen nekorišćen. Korišćeni uzorci su bili u upotrebi preko 52000 sati. Utvrđeno je da do loma dolazi uvek u osnovnom metalu korišćenog uzorka. Pretpostavljeno je da kritični uslovi nastaju usled puzanjem izazvanog rasta zrna i/ili taloga. Najviši nivo zatezne čvrstoće je u kombinaciji dva nekorišćena uzorka.
AB  - The aim of this work was to establish the influence of initial state of base metal on properties of mma welded 14MoV 6 3 steel. Three combinations of specimens were welded: (i) virgin-virgin (N-N); (ii) used-used (S-S); (iii) virgin-used (N-S). Used specimens were 52000 hours in exploitation. It has been established that the fracture is initiated in the zone of used part. It is assumed that the critical conditions were achieved as the consequence of creep induced grain growth and particle coarsening. On the other hand, testing of unused specimens revealed the highest level of strength.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3
T1  - Influence of initial state on properties of mma welded 14mov 6 3 steel
EP  - 60
IS  - 2
SP  - 53
VL  - 57
UR  - https://hdl.handle.net/21.15107/rcub_rims_185
ER  - 

@article{
author = "Sadibašić, Damir and Radović, Nenad and Grabulov, Vencislav and Zrilić, Milorad",
year = "2012",
abstract = "U radu je ispitan uticaj stanja osnovnog metala na osobine REL zavarenog spoja čelika 14MoV 6 3. Zavarene su tri kombinacije uzoraka: (i) nekorišćen; (ii) korišćen-korišćen; i (iii) korišćen nekorišćen. Korišćeni uzorci su bili u upotrebi preko 52000 sati. Utvrđeno je da do loma dolazi uvek u osnovnom metalu korišćenog uzorka. Pretpostavljeno je da kritični uslovi nastaju usled puzanjem izazvanog rasta zrna i/ili taloga. Najviši nivo zatezne čvrstoće je u kombinaciji dva nekorišćena uzorka., The aim of this work was to establish the influence of initial state of base metal on properties of mma welded 14MoV 6 3 steel. Three combinations of specimens were welded: (i) virgin-virgin (N-N); (ii) used-used (S-S); (iii) virgin-used (N-S). Used specimens were 52000 hours in exploitation. It has been established that the fracture is initiated in the zone of used part. It is assumed that the critical conditions were achieved as the consequence of creep induced grain growth and particle coarsening. On the other hand, testing of unused specimens revealed the highest level of strength.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3, Influence of initial state on properties of mma welded 14mov 6 3 steel",
pages = "60-53",
number = "2",
volume = "57",
url = "https://hdl.handle.net/21.15107/rcub_rims_185"
}

Sadibašić, D., Radović, N., Grabulov, V.,& Zrilić, M.. (2012). Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 57(2), 53-60.
https://hdl.handle.net/21.15107/rcub_rims_185

Sadibašić D, Radović N, Grabulov V, Zrilić M. Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3. in Zavarivanje i zavarene konstrukcije. 2012;57(2):53-60.
https://hdl.handle.net/21.15107/rcub_rims_185 .

Sadibašić, Damir, Radović, Nenad, Grabulov, Vencislav, Zrilić, Milorad, "Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3" in Zavarivanje i zavarene konstrukcije, 57, no. 2 (2012):53-60,
https://hdl.handle.net/21.15107/rcub_rims_185 .

TY  - JOUR
AU  - Mijajlović, Miroslav
AU  - Milčić, Dragan
AU  - Đurđanović, Miroslav
AU  - Grabulov, Vencislav
AU  - Živković, Aleksandar
AU  - Perović, Milenko
PY  - 2012
UR  - http://rims.institutims.rs/handle/123456789/178
AB  - Zavarivanje trenjem sa mešanjem - ZTM (eng. Friction Stir Welding - FSW) je relativno mlad postupak zavarivanja u čvrstom stanju nastao na Institutu za zavarivanje (TWI) u Londonu, krajem 1991. godine. Prva primena ZTM postupka se vezuje za železnicu i zavarivanje aluminijuma i njegovih legura ali se sa vremenom proširio opseg primene tako da se danas ovim postupkom uspešno zavaruje veliki broj čistih metala, legura, ali i nemetala, u svim industrijskim granama (železnica. avioindustrija, automobilska, brodogradnja itd.). Dve decenije po nastajanju, ZTM postupak se ipak, najviše koristi za zavarivanje aluminijuma i njegovih legura, te nije iznenađujuće što su prvi koraci standardizacije ZTM postupka vezani za zavarivanje aluminijuma. Ovim radom se skreće pažnja na osnovne pojmove kod ZTM koji su dati u postojećim standardima i predlažu odgovarajući pojmovi na srpskom jeziku.
AB  - Friction Stir Welding is relatively young welding process in solid state which is created in The Welding Institute - London, during 1991 year. The first application is connected with railway and aluminum and aluminum alloys welding but later the application range is extended, so today this process successfully welded many pure metals, alloys also, non-metals in all industrial branches (railway, aircraft, automotive, shipyard etc). Two decades after formation, FSW process is the mostly used for aluminum and aluminum alloys welding, so it is not surprise that the first step in FSW standardization is connected to aluminum welding. The aim of this paper is to draw attention to basic terms for FSW which are presented in actual standards and suggested appropriated terms on Serbian language.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Osnovni pojmovi kod postupka zavarivanja trenjem sa mešanjem prema AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011
T1  - Basic terms in friction stir welding according to AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011
EP  - 68
IS  - 2
SP  - 61
VL  - 57
UR  - https://hdl.handle.net/21.15107/rcub_rims_178
ER  - 

@article{
author = "Mijajlović, Miroslav and Milčić, Dragan and Đurđanović, Miroslav and Grabulov, Vencislav and Živković, Aleksandar and Perović, Milenko",
year = "2012",
abstract = "Zavarivanje trenjem sa mešanjem - ZTM (eng. Friction Stir Welding - FSW) je relativno mlad postupak zavarivanja u čvrstom stanju nastao na Institutu za zavarivanje (TWI) u Londonu, krajem 1991. godine. Prva primena ZTM postupka se vezuje za železnicu i zavarivanje aluminijuma i njegovih legura ali se sa vremenom proširio opseg primene tako da se danas ovim postupkom uspešno zavaruje veliki broj čistih metala, legura, ali i nemetala, u svim industrijskim granama (železnica. avioindustrija, automobilska, brodogradnja itd.). Dve decenije po nastajanju, ZTM postupak se ipak, najviše koristi za zavarivanje aluminijuma i njegovih legura, te nije iznenađujuće što su prvi koraci standardizacije ZTM postupka vezani za zavarivanje aluminijuma. Ovim radom se skreće pažnja na osnovne pojmove kod ZTM koji su dati u postojećim standardima i predlažu odgovarajući pojmovi na srpskom jeziku., Friction Stir Welding is relatively young welding process in solid state which is created in The Welding Institute - London, during 1991 year. The first application is connected with railway and aluminum and aluminum alloys welding but later the application range is extended, so today this process successfully welded many pure metals, alloys also, non-metals in all industrial branches (railway, aircraft, automotive, shipyard etc). Two decades after formation, FSW process is the mostly used for aluminum and aluminum alloys welding, so it is not surprise that the first step in FSW standardization is connected to aluminum welding. The aim of this paper is to draw attention to basic terms for FSW which are presented in actual standards and suggested appropriated terms on Serbian language.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Osnovni pojmovi kod postupka zavarivanja trenjem sa mešanjem prema AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011, Basic terms in friction stir welding according to AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011",
pages = "68-61",
number = "2",
volume = "57",
url = "https://hdl.handle.net/21.15107/rcub_rims_178"
}

Mijajlović, M., Milčić, D., Đurđanović, M., Grabulov, V., Živković, A.,& Perović, M.. (2012). Osnovni pojmovi kod postupka zavarivanja trenjem sa mešanjem prema AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 57(2), 61-68.
https://hdl.handle.net/21.15107/rcub_rims_178

Mijajlović M, Milčić D, Đurđanović M, Grabulov V, Živković A, Perović M. Osnovni pojmovi kod postupka zavarivanja trenjem sa mešanjem prema AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011. in Zavarivanje i zavarene konstrukcije. 2012;57(2):61-68.
https://hdl.handle.net/21.15107/rcub_rims_178 .

Mijajlović, Miroslav, Milčić, Dragan, Đurđanović, Miroslav, Grabulov, Vencislav, Živković, Aleksandar, Perović, Milenko, "Osnovni pojmovi kod postupka zavarivanja trenjem sa mešanjem prema AWS D17.3/D17.3M:2010 i ISO 25239-1: 2011" in Zavarivanje i zavarene konstrukcije, 57, no. 2 (2012):61-68,
https://hdl.handle.net/21.15107/rcub_rims_178 .

TY  - JOUR
AU  - Odanović, Zoran
AU  - Grabulov, Vencislav
AU  - Arsić, Miodrag
AU  - Đurđević, Mile
AU  - Katavić, Boris
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/130
AB  - Najznačajniji delovi hidroelektrana, vratila turbina izložena su tokom rada visokim naprezanjima, puzamju, zamoru i koroziji. Zbog toga je korisno preduprediti oštećenja tokom rada, povećati pouzdanost i produžiti radni vek postrojenja. Eksploatacioni uslovi mogu da dovedu do prslina i loma u homogenom materijalu, tako da postoji potreba za reparaturom dela postrojenja. A ona može biti skupa ili dugotrajna. U okolnostima kada se reparatura izvodi na licu mesta, posebno pažljivo treba da se definiše tehnologija reparaturnog zavarivanja, parametri postupka, i izbor dodatnog materijala. U ovom istraživanju izbor dodatnog materijala je bio tema i dati su rezultati. Vratilo je izrađeno od čeličnog liva 20Mn5 i na njemu su metodama IBR, otkrivena oštećenja tipa prslina dužine do 400 mm i dubine do 20 mm. Kako je planirano da se reparatura izvede bez demontaže vratila, primena termičke obrade nije bila izvodljiva. Analiza zavarljivosti osnovnoog materijala urađena je korišćenjem analitičkih jednačina. Rezultati su pokazali da je zavarljivost ovog čelika ograničena. Za reparaturno zavarivanje izabran je postupak REL (111) i dve obložene austenitne elektrode sa ciljem određivanja pogodnosti za upotrebu kao potencijalnih dodatnih materijala za reparaturu. U ovom istraživanju ispitane su Fe-Ni-Cr-Mo elektroda i elektroda na bazi Ni i njihove osobine su upoređene. Ispitivanje zatezanjem, ispitivanje apsorbovane energije, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe, izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, 20Mn5, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, čelika 20Mn5, sa ispitivanim dodatnim materijalima. Dobijeni rezultati su analizirani i na osnovu toga, odabrana je elektroda na bazi Ni kao pogodnija za reparaturno zavarivanje.
AB  - The most significant components of hydropower plants are turbine shafts and generator rotors which undergo time-dependent processes such as high stresses, creep, fatigue and corrosion. It is therefore desirable to prevent in-service damages, improve reliability and extend the operational life of the plant. Plant operation can lead to cracking and failures in homogeneous materials, therefore a need for repair welding on plant components, which can be expensive and time-consuming, exists. In the circumstances when repair welding has to be carried out on site, special care has to be taken in defining repair welding technology, process parameters and selection of filler materials. In this research a selection of filler materials for repair welding on site of hydropower turbine shaft was performed and results were presented. The shaft was made of the cast steel 20Mn5 and presence of damages in the form of cracks which were up to 400 mm long and up to 20 mm deep was detected through the use of NDT methods. As the repairing was planned to be carried out without disassembling of the shaft, application of heat treatment procedures was not feasible. Weldability analysis of the base material was performed through the use of analytical equations. Results have shown that weldability of this steel is limited. For the repair welding a MMA (111) welding process was selected and two covered austenitic electrodes were analyzed in order to establish the feasibility of their use as potential filler material for repairing. In this research a Fe-Ni-Cr-Mo electrode and Ni based electrode were tested and their properties were compared. Tensile testing, absorbed energies tests, bending tests, hardness measurements and sensitivity tests such as 'CTS' and 'Y' were performed on test joints obtained by welding of base material, 20Mn5 steel, with investigated filler materials. Obtained results were analyzed and a Ni based electrode was selected as most suitable for repair welding.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta
T1  - Selection of the optimal filler material for on-site repair welding of the turbine shaft at the hydropower plant
EP  - 166
IS  - 4
SP  - 149
VL  - 56
UR  - https://hdl.handle.net/21.15107/rcub_rims_130
ER  - 

@article{
author = "Odanović, Zoran and Grabulov, Vencislav and Arsić, Miodrag and Đurđević, Mile and Katavić, Boris",
year = "2011",
abstract = "Najznačajniji delovi hidroelektrana, vratila turbina izložena su tokom rada visokim naprezanjima, puzamju, zamoru i koroziji. Zbog toga je korisno preduprediti oštećenja tokom rada, povećati pouzdanost i produžiti radni vek postrojenja. Eksploatacioni uslovi mogu da dovedu do prslina i loma u homogenom materijalu, tako da postoji potreba za reparaturom dela postrojenja. A ona može biti skupa ili dugotrajna. U okolnostima kada se reparatura izvodi na licu mesta, posebno pažljivo treba da se definiše tehnologija reparaturnog zavarivanja, parametri postupka, i izbor dodatnog materijala. U ovom istraživanju izbor dodatnog materijala je bio tema i dati su rezultati. Vratilo je izrađeno od čeličnog liva 20Mn5 i na njemu su metodama IBR, otkrivena oštećenja tipa prslina dužine do 400 mm i dubine do 20 mm. Kako je planirano da se reparatura izvede bez demontaže vratila, primena termičke obrade nije bila izvodljiva. Analiza zavarljivosti osnovnoog materijala urađena je korišćenjem analitičkih jednačina. Rezultati su pokazali da je zavarljivost ovog čelika ograničena. Za reparaturno zavarivanje izabran je postupak REL (111) i dve obložene austenitne elektrode sa ciljem određivanja pogodnosti za upotrebu kao potencijalnih dodatnih materijala za reparaturu. U ovom istraživanju ispitane su Fe-Ni-Cr-Mo elektroda i elektroda na bazi Ni i njihove osobine su upoređene. Ispitivanje zatezanjem, ispitivanje apsorbovane energije, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe, izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, 20Mn5, ispitivanje savijanjem, merenje tvrdoće i ispiivanje osetljivosti kao što su 'CTS' i 'Y' probe izvedeni su na ispitnim spojevima dobijenim zavarivanjem osnovnog materijala, čelika 20Mn5, sa ispitivanim dodatnim materijalima. Dobijeni rezultati su analizirani i na osnovu toga, odabrana je elektroda na bazi Ni kao pogodnija za reparaturno zavarivanje., The most significant components of hydropower plants are turbine shafts and generator rotors which undergo time-dependent processes such as high stresses, creep, fatigue and corrosion. It is therefore desirable to prevent in-service damages, improve reliability and extend the operational life of the plant. Plant operation can lead to cracking and failures in homogeneous materials, therefore a need for repair welding on plant components, which can be expensive and time-consuming, exists. In the circumstances when repair welding has to be carried out on site, special care has to be taken in defining repair welding technology, process parameters and selection of filler materials. In this research a selection of filler materials for repair welding on site of hydropower turbine shaft was performed and results were presented. The shaft was made of the cast steel 20Mn5 and presence of damages in the form of cracks which were up to 400 mm long and up to 20 mm deep was detected through the use of NDT methods. As the repairing was planned to be carried out without disassembling of the shaft, application of heat treatment procedures was not feasible. Weldability analysis of the base material was performed through the use of analytical equations. Results have shown that weldability of this steel is limited. For the repair welding a MMA (111) welding process was selected and two covered austenitic electrodes were analyzed in order to establish the feasibility of their use as potential filler material for repairing. In this research a Fe-Ni-Cr-Mo electrode and Ni based electrode were tested and their properties were compared. Tensile testing, absorbed energies tests, bending tests, hardness measurements and sensitivity tests such as 'CTS' and 'Y' were performed on test joints obtained by welding of base material, 20Mn5 steel, with investigated filler materials. Obtained results were analyzed and a Ni based electrode was selected as most suitable for repair welding.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta, Selection of the optimal filler material for on-site repair welding of the turbine shaft at the hydropower plant",
pages = "166-149",
number = "4",
volume = "56",
url = "https://hdl.handle.net/21.15107/rcub_rims_130"
}

Odanović, Z., Grabulov, V., Arsić, M., Đurđević, M.,& Katavić, B.. (2011). Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 56(4), 149-166.
https://hdl.handle.net/21.15107/rcub_rims_130

Odanović Z, Grabulov V, Arsić M, Đurđević M, Katavić B. Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta. in Zavarivanje i zavarene konstrukcije. 2011;56(4):149-166.
https://hdl.handle.net/21.15107/rcub_rims_130 .

Odanović, Zoran, Grabulov, Vencislav, Arsić, Miodrag, Đurđević, Mile, Katavić, Boris, "Izbor optimalnog dodatnog materijala za reparaturno zavarivanje vratila turbine hidrocentrale na licu mesta" in Zavarivanje i zavarene konstrukcije, 56, no. 4 (2011):149-166,
https://hdl.handle.net/21.15107/rcub_rims_130 .

TY  - JOUR
AU  - Balos, Sebastian
AU  - Grabulov, Vencislav
AU  - Šiđanin, Leposava
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/125
AB  - Present-day reliance on wheeled and tracked armour personnel carriers (APCs) and infantry fighting vehicles (IFVs), may be changed in the future. Shaped charge grenades and impovised explosive devices (IEDs) represent a considerable threat, even to well protected main battle tanks (MBTs). Paradoxically, the crew of wheeled and tracked troop-carrying vehicles is numerically three to four times larger than that of MBTs, however, their protection in all aspects is significantly lower. Therefore, heavier vehicles may get more attention in the future, where sharing the chassis and a number of components with MBTs could provide significant reductions in procurement costs and maintenance, as well as a simplified logistics in relation to the latest tracked. Obviously, the IFVs mobility of heavy vehicles would be lower than that of lighter vehicles. However, by applying various degrees of modular armour protection, a significant rise in strategic, operational, and tactical mobility could be achieved. Such heavy tracked vehicles, built on a common chassis as MBTs, may equip the future heavy brigades, which will be in contrast to the lighter wheeled vehicles included in rapid deployment brigades. As a result, tracked personnel carrying vehicles may extinct in the future.
PB  - Defence Scientific Information Documentation Centre, Delhi
T2  - Defence Science Journal
T1  - Future Armoured Troop Carrying Vehicles
EP  - 490
IS  - 5
SP  - 483
VL  - 60
DO  - 10.14429/dsj.60.550
ER  - 

@article{
author = "Balos, Sebastian and Grabulov, Vencislav and Šiđanin, Leposava",
year = "2010",
abstract = "Present-day reliance on wheeled and tracked armour personnel carriers (APCs) and infantry fighting vehicles (IFVs), may be changed in the future. Shaped charge grenades and impovised explosive devices (IEDs) represent a considerable threat, even to well protected main battle tanks (MBTs). Paradoxically, the crew of wheeled and tracked troop-carrying vehicles is numerically three to four times larger than that of MBTs, however, their protection in all aspects is significantly lower. Therefore, heavier vehicles may get more attention in the future, where sharing the chassis and a number of components with MBTs could provide significant reductions in procurement costs and maintenance, as well as a simplified logistics in relation to the latest tracked. Obviously, the IFVs mobility of heavy vehicles would be lower than that of lighter vehicles. However, by applying various degrees of modular armour protection, a significant rise in strategic, operational, and tactical mobility could be achieved. Such heavy tracked vehicles, built on a common chassis as MBTs, may equip the future heavy brigades, which will be in contrast to the lighter wheeled vehicles included in rapid deployment brigades. As a result, tracked personnel carrying vehicles may extinct in the future.",
publisher = "Defence Scientific Information Documentation Centre, Delhi",
journal = "Defence Science Journal",
title = "Future Armoured Troop Carrying Vehicles",
pages = "490-483",
number = "5",
volume = "60",
doi = "10.14429/dsj.60.550"
}

Balos, S., Grabulov, V.,& Šiđanin, L.. (2010). Future Armoured Troop Carrying Vehicles. in Defence Science Journal
Defence Scientific Information Documentation Centre, Delhi., 60(5), 483-490.
https://doi.org/10.14429/dsj.60.550

Balos S, Grabulov V, Šiđanin L. Future Armoured Troop Carrying Vehicles. in Defence Science Journal. 2010;60(5):483-490.
doi:10.14429/dsj.60.550 .

Balos, Sebastian, Grabulov, Vencislav, Šiđanin, Leposava, "Future Armoured Troop Carrying Vehicles" in Defence Science Journal, 60, no. 5 (2010):483-490,
https://doi.org/10.14429/dsj.60.550 . .

TY  - JOUR
AU  - Popović, Olivera
AU  - Prokić-Cvetković, Radica
AU  - Sedmak, Aleksandar
AU  - Grabulov, Vencislav
AU  - Burzić, Zijah
AU  - Rakin, Marko
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/123
AB  - In this paper microstructural and mechanical properties of high-carbon steel surface welded layer, obtained with self-shielded flux cored wire, are presented in the case of a standard rails and crossings. The testing results of tensile characteristics, hardness, toughness via instrumented Charpy pendulum, microstructural analysis and fatigue crack growth resistance of all characteristical zones are analysed in details, especially from the point of view of interaction between microstructure and properties. Obtained results indicate superior properties of repaired welded layers, due to their similarity to the new generation of bainitic steel, i.e., due to change of microstructure from original pearlitic structure to final bainitic structure. Finally, fatigue crack growth parameters have shown that deposite layer has higher resistance to the crack growth, improving overall reliability of rails and crossings.
T2  - Strojniski Vestnik/Journal of Mechanical Engineering
T1  - Characterisation of high-carbon steel surface welded layer
IS  - 5
VL  - 56
UR  - https://hdl.handle.net/21.15107/rcub_rims_123
ER  - 

@article{
author = "Popović, Olivera and Prokić-Cvetković, Radica and Sedmak, Aleksandar and Grabulov, Vencislav and Burzić, Zijah and Rakin, Marko",
year = "2010",
abstract = "In this paper microstructural and mechanical properties of high-carbon steel surface welded layer, obtained with self-shielded flux cored wire, are presented in the case of a standard rails and crossings. The testing results of tensile characteristics, hardness, toughness via instrumented Charpy pendulum, microstructural analysis and fatigue crack growth resistance of all characteristical zones are analysed in details, especially from the point of view of interaction between microstructure and properties. Obtained results indicate superior properties of repaired welded layers, due to their similarity to the new generation of bainitic steel, i.e., due to change of microstructure from original pearlitic structure to final bainitic structure. Finally, fatigue crack growth parameters have shown that deposite layer has higher resistance to the crack growth, improving overall reliability of rails and crossings.",
journal = "Strojniski Vestnik/Journal of Mechanical Engineering",
title = "Characterisation of high-carbon steel surface welded layer",
number = "5",
volume = "56",
url = "https://hdl.handle.net/21.15107/rcub_rims_123"
}

Popović, O., Prokić-Cvetković, R., Sedmak, A., Grabulov, V., Burzić, Z.,& Rakin, M.. (2010). Characterisation of high-carbon steel surface welded layer. in Strojniski Vestnik/Journal of Mechanical Engineering, 56(5).
https://hdl.handle.net/21.15107/rcub_rims_123

Popović O, Prokić-Cvetković R, Sedmak A, Grabulov V, Burzić Z, Rakin M. Characterisation of high-carbon steel surface welded layer. in Strojniski Vestnik/Journal of Mechanical Engineering. 2010;56(5).
https://hdl.handle.net/21.15107/rcub_rims_123 .

Popović, Olivera, Prokić-Cvetković, Radica, Sedmak, Aleksandar, Grabulov, Vencislav, Burzić, Zijah, Rakin, Marko, "Characterisation of high-carbon steel surface welded layer" in Strojniski Vestnik/Journal of Mechanical Engineering, 56, no. 5 (2010),
https://hdl.handle.net/21.15107/rcub_rims_123 .

TY  - JOUR
AU  - Balos, Sebastian
AU  - Šiđanin, Leposava
AU  - Sabo, Bela
AU  - Grabulov, Vencislav
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/118
AB  - Polimetilmetakrilat (PMMA), zbog svojih karakteristika, pre svega transparentnosti i relativno male gustine, predstavlja danas vrlo atraktivan materijal u inženjerstvu. Zbog toga, istražuju se nove mogućnosti spajanja ovog materijala u cilju dobijanja kompleksnijih i većih radnih predmeta. U ovom radu su prikazane tehnike zavarivanja i spajanja, koje imaju potencijal za primenu u proizvodnji: ultrazvučno zavarivanje, toplotno spajanje, mikrotalasno zavarivanje i tačkasto zavarivanje trenjem. Takođe, prikazani su i uporedne vrednosti smicajne čvrstoće, jednog od dominantnih pokazatelja kvaliteta zavarenog spoja. Na osnovu prikazanih rezultata, najveću smicajnu čvrstoću ima tačkasto zavarivanje trenjem, sledi mikrotalasno zavarivanje, dok najmanju nosivost zavarenog spoja imaju toplotno spajanje i ultrazvučno zavarivanje. Pored toga, na osnovu specifičnosti pojedinih tehnika zavarivanja, može da se konstatuje da je tačkasto zavarivanje trenjem pogodnije za veće radne predmete, dok je veličina radnog predmeta kod mikrotalasnog zavarivanja ograničena veličinom mikrotalasne komore.
AB  - Polymethylmethacrylate (PMMA) has attractive features, primarily its transparency and low density, which make it a very promising engineering material. Therefore, a novel bonding and welding techniques are being developed, to enable obtaining more complex and larger products. In this paper, perspective bonding and welding processes are presented: ultrasound welding, thermal bonding, microwave welding and friction spot welding. Furthermore, shear strengths of joints obtained by different techniques are shown. Shear strength of joints is commonly used to evaluate the quality of joints. The highest shear strength has friction spot welding, followed by microwave welding. The lowest shear strengths were obtained with thermal bonding and ultrasound welding. Specific characteristics of each joining technique determine their usefulness: friction spot welding is more suited to welding large pieces, while the work piece dimensions weldable by microwave welding is limited by microwave chamber size.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Tehnologija zavarivanja polimetilmetakrilata (PMMA)
T1  - Polymethylmethacrylate (PMMA) welding technology
EP  - 146
IS  - 4
SP  - 143
VL  - 55
UR  - https://hdl.handle.net/21.15107/rcub_rims_118
ER  - 

@article{
author = "Balos, Sebastian and Šiđanin, Leposava and Sabo, Bela and Grabulov, Vencislav",
year = "2010",
abstract = "Polimetilmetakrilat (PMMA), zbog svojih karakteristika, pre svega transparentnosti i relativno male gustine, predstavlja danas vrlo atraktivan materijal u inženjerstvu. Zbog toga, istražuju se nove mogućnosti spajanja ovog materijala u cilju dobijanja kompleksnijih i većih radnih predmeta. U ovom radu su prikazane tehnike zavarivanja i spajanja, koje imaju potencijal za primenu u proizvodnji: ultrazvučno zavarivanje, toplotno spajanje, mikrotalasno zavarivanje i tačkasto zavarivanje trenjem. Takođe, prikazani su i uporedne vrednosti smicajne čvrstoće, jednog od dominantnih pokazatelja kvaliteta zavarenog spoja. Na osnovu prikazanih rezultata, najveću smicajnu čvrstoću ima tačkasto zavarivanje trenjem, sledi mikrotalasno zavarivanje, dok najmanju nosivost zavarenog spoja imaju toplotno spajanje i ultrazvučno zavarivanje. Pored toga, na osnovu specifičnosti pojedinih tehnika zavarivanja, može da se konstatuje da je tačkasto zavarivanje trenjem pogodnije za veće radne predmete, dok je veličina radnog predmeta kod mikrotalasnog zavarivanja ograničena veličinom mikrotalasne komore., Polymethylmethacrylate (PMMA) has attractive features, primarily its transparency and low density, which make it a very promising engineering material. Therefore, a novel bonding and welding techniques are being developed, to enable obtaining more complex and larger products. In this paper, perspective bonding and welding processes are presented: ultrasound welding, thermal bonding, microwave welding and friction spot welding. Furthermore, shear strengths of joints obtained by different techniques are shown. Shear strength of joints is commonly used to evaluate the quality of joints. The highest shear strength has friction spot welding, followed by microwave welding. The lowest shear strengths were obtained with thermal bonding and ultrasound welding. Specific characteristics of each joining technique determine their usefulness: friction spot welding is more suited to welding large pieces, while the work piece dimensions weldable by microwave welding is limited by microwave chamber size.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Tehnologija zavarivanja polimetilmetakrilata (PMMA), Polymethylmethacrylate (PMMA) welding technology",
pages = "146-143",
number = "4",
volume = "55",
url = "https://hdl.handle.net/21.15107/rcub_rims_118"
}

Balos, S., Šiđanin, L., Sabo, B.,& Grabulov, V.. (2010). Tehnologija zavarivanja polimetilmetakrilata (PMMA). in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 55(4), 143-146.
https://hdl.handle.net/21.15107/rcub_rims_118

Balos S, Šiđanin L, Sabo B, Grabulov V. Tehnologija zavarivanja polimetilmetakrilata (PMMA). in Zavarivanje i zavarene konstrukcije. 2010;55(4):143-146.
https://hdl.handle.net/21.15107/rcub_rims_118 .

Balos, Sebastian, Šiđanin, Leposava, Sabo, Bela, Grabulov, Vencislav, "Tehnologija zavarivanja polimetilmetakrilata (PMMA)" in Zavarivanje i zavarene konstrukcije, 55, no. 4 (2010):143-146,
https://hdl.handle.net/21.15107/rcub_rims_118 .

TY  - JOUR
AU  - Svetel, Igor
AU  - Đurović, Aleksandar
AU  - Grabulov, Vencislav
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/116
AB  - The paper describes a redesign project undertaken in a short period to adapt a software system to user needs. Additional goals of the project included a shift to Open Source software and the selection of technology to enable sustainable system development. The paper chronologically describes all phases of the project and provides reasons for all decisions taken during the development process. The paper concludes with a discussion of the merits of the redesign methodology.
PB  - ComSIS Consortium
T2  - Computer Science and Information Systems
T1  - Prompt system redesign: Shifting to open source technology to satisfy user requirements
EP  - 457
IS  - 3
SP  - 441
VL  - 7
DO  - 10.2298/CSIS090422005S
ER  - 

@article{
author = "Svetel, Igor and Đurović, Aleksandar and Grabulov, Vencislav",
year = "2010",
abstract = "The paper describes a redesign project undertaken in a short period to adapt a software system to user needs. Additional goals of the project included a shift to Open Source software and the selection of technology to enable sustainable system development. The paper chronologically describes all phases of the project and provides reasons for all decisions taken during the development process. The paper concludes with a discussion of the merits of the redesign methodology.",
publisher = "ComSIS Consortium",
journal = "Computer Science and Information Systems",
title = "Prompt system redesign: Shifting to open source technology to satisfy user requirements",
pages = "457-441",
number = "3",
volume = "7",
doi = "10.2298/CSIS090422005S"
}

Svetel, I., Đurović, A.,& Grabulov, V.. (2010). Prompt system redesign: Shifting to open source technology to satisfy user requirements. in Computer Science and Information Systems
ComSIS Consortium., 7(3), 441-457.
https://doi.org/10.2298/CSIS090422005S

Svetel I, Đurović A, Grabulov V. Prompt system redesign: Shifting to open source technology to satisfy user requirements. in Computer Science and Information Systems. 2010;7(3):441-457.
doi:10.2298/CSIS090422005S .

Svetel, Igor, Đurović, Aleksandar, Grabulov, Vencislav, "Prompt system redesign: Shifting to open source technology to satisfy user requirements" in Computer Science and Information Systems, 7, no. 3 (2010):441-457,
https://doi.org/10.2298/CSIS090422005S . .

TY  - JOUR
AU  - Odanović, Zoran
AU  - Blačić, Ivo
AU  - Vracarić, D.
AU  - Grabulov, Vencislav
AU  - Burzić, Meri
AU  - Katavić, Boris
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/113
AB  - Metallurgical evaluation was performed on a fractured column tube of the reformer furnace in an ammonia plant. The tubes were manufactured from centrifugally cast heat resistant steel HK 40. Optical and scanning electron microscope (SEM) were used for microstructural and fracture analysis. For composition determination of the microconstituents energy dispersive X ray spectroscopy (EDS) was used. To evaluate mechanical properties, hardness and microhardness measurements were performed. Investigations based on the microstructural features with the idea to indicate suitability of weld repair of the column were performed in this study. It was observed that the crack initiation, caused by oxidation/corrosion and thermal stresses induced by temperature gradient, appeared in the inner side of the tube wall and propagation occurred along grain boundaries. The results clearly showed the presence of an irregular microstructure which contributed to crack propagation through the tube wall. An occurrence of precipitated needle-shaped carbides/carbonitrides and brittle a phase was also identified in the microstructure. Results of the microstructural and fracture analysis clearly indicate that reformer furnace columns made of heat resistant steel HK 40 were unsuitable for weld repair.
PB  - Consejo Superior Investigaciones Cientificas-Csic, Madrid
T2  - Revista de Metalurgia
T1  - Microstructural analysis as the indicator for suitability of weld repairing of the heat resistant Cr - Ni steel
EP  - 330
IS  - 4
SP  - 320
VL  - 46
DO  - 10.3989/revmetalm.0939
ER  - 

@article{
author = "Odanović, Zoran and Blačić, Ivo and Vracarić, D. and Grabulov, Vencislav and Burzić, Meri and Katavić, Boris",
year = "2010",
abstract = "Metallurgical evaluation was performed on a fractured column tube of the reformer furnace in an ammonia plant. The tubes were manufactured from centrifugally cast heat resistant steel HK 40. Optical and scanning electron microscope (SEM) were used for microstructural and fracture analysis. For composition determination of the microconstituents energy dispersive X ray spectroscopy (EDS) was used. To evaluate mechanical properties, hardness and microhardness measurements were performed. Investigations based on the microstructural features with the idea to indicate suitability of weld repair of the column were performed in this study. It was observed that the crack initiation, caused by oxidation/corrosion and thermal stresses induced by temperature gradient, appeared in the inner side of the tube wall and propagation occurred along grain boundaries. The results clearly showed the presence of an irregular microstructure which contributed to crack propagation through the tube wall. An occurrence of precipitated needle-shaped carbides/carbonitrides and brittle a phase was also identified in the microstructure. Results of the microstructural and fracture analysis clearly indicate that reformer furnace columns made of heat resistant steel HK 40 were unsuitable for weld repair.",
publisher = "Consejo Superior Investigaciones Cientificas-Csic, Madrid",
journal = "Revista de Metalurgia",
title = "Microstructural analysis as the indicator for suitability of weld repairing of the heat resistant Cr - Ni steel",
pages = "330-320",
number = "4",
volume = "46",
doi = "10.3989/revmetalm.0939"
}

Odanović, Z., Blačić, I., Vracarić, D., Grabulov, V., Burzić, M.,& Katavić, B.. (2010). Microstructural analysis as the indicator for suitability of weld repairing of the heat resistant Cr - Ni steel. in Revista de Metalurgia
Consejo Superior Investigaciones Cientificas-Csic, Madrid., 46(4), 320-330.
https://doi.org/10.3989/revmetalm.0939

Odanović Z, Blačić I, Vracarić D, Grabulov V, Burzić M, Katavić B. Microstructural analysis as the indicator for suitability of weld repairing of the heat resistant Cr - Ni steel. in Revista de Metalurgia. 2010;46(4):320-330.
doi:10.3989/revmetalm.0939 .

Odanović, Zoran, Blačić, Ivo, Vracarić, D., Grabulov, Vencislav, Burzić, Meri, Katavić, Boris, "Microstructural analysis as the indicator for suitability of weld repairing of the heat resistant Cr - Ni steel" in Revista de Metalurgia, 46, no. 4 (2010):320-330,
https://doi.org/10.3989/revmetalm.0939 . .

TY  - JOUR
AU  - Balos, Sebastian
AU  - Grabulov, Vencislav
AU  - Šiđanin, Leposava
AU  - Pantić, Mladen
AU  - Radisavljević, Igor
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/112
AB  - In this paper, the ballistic resistance of perforated plates made of different types of steel, mounting and geometry was investigated. Different types of steel in various heat treatment conditions were tested. Target mounting was also varied: rigid, oblique and hanging. Furthermore, four different perforated plate geometries were tested: two plate thicknesses and two hole diameters. Their behaviour was tested using impact from firing 12.7 mm M-8 API ammunition at eleven perforated plate samples. These samples were placed by means of a steel frame over a 13 mm RHA plate, at two distances. Damaged area on targets was correlated to ballistic resistance of the whole armour to find the optimal perforated plate. It was found that perforated plates, in optimized case offer a frequent fracture of the penetrating core in up to five parts. This debris is unable to penetrate the basic plate, offering mass effectiveness of the whole armour model of 1.76 and the mass effectiveness of the perforated plate of 5.91.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Geometry, mechanical properties and mounting of perforated plates for ballistic application
EP  - 2924
IS  - 6
SP  - 2916
VL  - 31
DO  - 10.1016/j.matdes.2009.12.031
ER  - 

@article{
author = "Balos, Sebastian and Grabulov, Vencislav and Šiđanin, Leposava and Pantić, Mladen and Radisavljević, Igor",
year = "2010",
abstract = "In this paper, the ballistic resistance of perforated plates made of different types of steel, mounting and geometry was investigated. Different types of steel in various heat treatment conditions were tested. Target mounting was also varied: rigid, oblique and hanging. Furthermore, four different perforated plate geometries were tested: two plate thicknesses and two hole diameters. Their behaviour was tested using impact from firing 12.7 mm M-8 API ammunition at eleven perforated plate samples. These samples were placed by means of a steel frame over a 13 mm RHA plate, at two distances. Damaged area on targets was correlated to ballistic resistance of the whole armour to find the optimal perforated plate. It was found that perforated plates, in optimized case offer a frequent fracture of the penetrating core in up to five parts. This debris is unable to penetrate the basic plate, offering mass effectiveness of the whole armour model of 1.76 and the mass effectiveness of the perforated plate of 5.91.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Geometry, mechanical properties and mounting of perforated plates for ballistic application",
pages = "2924-2916",
number = "6",
volume = "31",
doi = "10.1016/j.matdes.2009.12.031"
}

Balos, S., Grabulov, V., Šiđanin, L., Pantić, M.,& Radisavljević, I.. (2010). Geometry, mechanical properties and mounting of perforated plates for ballistic application. in Materials & Design
Elsevier Sci Ltd, Oxford., 31(6), 2916-2924.
https://doi.org/10.1016/j.matdes.2009.12.031

Balos S, Grabulov V, Šiđanin L, Pantić M, Radisavljević I. Geometry, mechanical properties and mounting of perforated plates for ballistic application. in Materials & Design. 2010;31(6):2916-2924.
doi:10.1016/j.matdes.2009.12.031 .

Balos, Sebastian, Grabulov, Vencislav, Šiđanin, Leposava, Pantić, Mladen, Radisavljević, Igor, "Geometry, mechanical properties and mounting of perforated plates for ballistic application" in Materials & Design, 31, no. 6 (2010):2916-2924,
https://doi.org/10.1016/j.matdes.2009.12.031 . .

TY  - JOUR
AU  - Balos, Sebastian
AU  - Grabulov, Vencislav
AU  - Šiđanin, Leposava
AU  - Pantić, Mladen
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/110
AB  - In this paper, the behaviour of wire fence was investigated for potential as applique armour. The wire fence used was made from commercial high-strength patented wire and the supporting frames were made of mild steel L-profiles. Both patented wire and L-profiles are of-the-shelf materials. The fence was tested by firing 12.7 min M8 API ammunition at four applique armour models: two of these models use a parallel wire arrangement, with one mounted at a 90 degrees angle from the incoming projectile and the other at 70 degrees; and two of these models use a zig-zag wire arrangement, one mounted at a firm 90 degrees, angle and the other is left in a hanging arrangement. Fence damage was correlated with RHA basic plate damage, on both the face and back. Wire fence has considerable potential as an improvised applique armour, except if the projectile impacts near the center of the wire or near the center between two wires. The latter case was successfully overcome by placing the armour model at an angle and by using a zig-zag wire arrangement. The lowest basic RHA plate damage level was found using the hanging armour model. However, from the point of view of ease of attachment, the most convenient was found to be the armour model with the zig-zag wire arrangement fixed at 90 degrees angle from the incoming projectile. SEM fracto graphy revealed that the fracture surface was predominantly ductile, with dimples filled with debris from the incendiary effect of the projectile.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Wire fence as applique armour
EP  - 1301
IS  - 3
SP  - 1293
VL  - 31
DO  - 10.1016/j.matdes.2009.09.013
ER  - 

@article{
author = "Balos, Sebastian and Grabulov, Vencislav and Šiđanin, Leposava and Pantić, Mladen",
year = "2010",
abstract = "In this paper, the behaviour of wire fence was investigated for potential as applique armour. The wire fence used was made from commercial high-strength patented wire and the supporting frames were made of mild steel L-profiles. Both patented wire and L-profiles are of-the-shelf materials. The fence was tested by firing 12.7 min M8 API ammunition at four applique armour models: two of these models use a parallel wire arrangement, with one mounted at a 90 degrees angle from the incoming projectile and the other at 70 degrees; and two of these models use a zig-zag wire arrangement, one mounted at a firm 90 degrees, angle and the other is left in a hanging arrangement. Fence damage was correlated with RHA basic plate damage, on both the face and back. Wire fence has considerable potential as an improvised applique armour, except if the projectile impacts near the center of the wire or near the center between two wires. The latter case was successfully overcome by placing the armour model at an angle and by using a zig-zag wire arrangement. The lowest basic RHA plate damage level was found using the hanging armour model. However, from the point of view of ease of attachment, the most convenient was found to be the armour model with the zig-zag wire arrangement fixed at 90 degrees angle from the incoming projectile. SEM fracto graphy revealed that the fracture surface was predominantly ductile, with dimples filled with debris from the incendiary effect of the projectile.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Wire fence as applique armour",
pages = "1301-1293",
number = "3",
volume = "31",
doi = "10.1016/j.matdes.2009.09.013"
}

Balos, S., Grabulov, V., Šiđanin, L.,& Pantić, M.. (2010). Wire fence as applique armour. in Materials & Design
Elsevier Sci Ltd, Oxford., 31(3), 1293-1301.
https://doi.org/10.1016/j.matdes.2009.09.013

Balos S, Grabulov V, Šiđanin L, Pantić M. Wire fence as applique armour. in Materials & Design. 2010;31(3):1293-1301.
doi:10.1016/j.matdes.2009.09.013 .

Balos, Sebastian, Grabulov, Vencislav, Šiđanin, Leposava, Pantić, Mladen, "Wire fence as applique armour" in Materials & Design, 31, no. 3 (2010):1293-1301,
https://doi.org/10.1016/j.matdes.2009.09.013 . .

TY  - JOUR
AU  - Sedmak, Stojan
AU  - Grabulov, Vencislav
AU  - Momčilović, Dejan
PY  - 2009
UR  - http://rims.institutims.rs/handle/123456789/87
AB  - U različitim vremenskim periodima dolazilo je do gubitka integriteta zavarenih konstrukcija zbog razvoja proizvodnih grešaka zavarenog spoja. Mehanizmi otkaza su bili različiti i uvek su predstavljali novo iskustvo, koje je zahtevalo nova znanja i drugačiji pristup u rešavanju problema. Opsežne analize svih otkaza razmatranih u radu i izvedeni zaključci ipak nisu dovoljni da se potpuno izbegnu proizvodne nesavršenosti i obezbedi integritet zavarenih konstrukcija u eksploataciji. Direktive, standardi i preporuke za izradu zavarenih konstrukcija značajno doprinose rešavanju problema, ali ga ne mogu potpuno eliminisati zbog složenosti i velikog broja uticajnih faktora.
AB  - At different time periods, loss in structural integrity occurs from initiation of manufacture defects in the welded joint. Failure mechanisms are different and present a new experience always requiring new knowledge and approach in solving the problem. Extended analyses of all failures considered here and derived conclusions are yet not sufficient in completely avoiding manufacture imperfections and assuring in-service integrity of welded structures. Directives, standards and recommendations for manufacturing welded structures significantly contribute in problem solving which they cannot completely eliminate due to the complexity and numerous influencing factors.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija
T1  - Chronology of lost structural integrity initiated from manufacturing defects in welded structures
EP  - 50
IS  - 1
SP  - 39
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_rims_87
ER  - 

@article{
author = "Sedmak, Stojan and Grabulov, Vencislav and Momčilović, Dejan",
year = "2009",
abstract = "U različitim vremenskim periodima dolazilo je do gubitka integriteta zavarenih konstrukcija zbog razvoja proizvodnih grešaka zavarenog spoja. Mehanizmi otkaza su bili različiti i uvek su predstavljali novo iskustvo, koje je zahtevalo nova znanja i drugačiji pristup u rešavanju problema. Opsežne analize svih otkaza razmatranih u radu i izvedeni zaključci ipak nisu dovoljni da se potpuno izbegnu proizvodne nesavršenosti i obezbedi integritet zavarenih konstrukcija u eksploataciji. Direktive, standardi i preporuke za izradu zavarenih konstrukcija značajno doprinose rešavanju problema, ali ga ne mogu potpuno eliminisati zbog složenosti i velikog broja uticajnih faktora., At different time periods, loss in structural integrity occurs from initiation of manufacture defects in the welded joint. Failure mechanisms are different and present a new experience always requiring new knowledge and approach in solving the problem. Extended analyses of all failures considered here and derived conclusions are yet not sufficient in completely avoiding manufacture imperfections and assuring in-service integrity of welded structures. Directives, standards and recommendations for manufacturing welded structures significantly contribute in problem solving which they cannot completely eliminate due to the complexity and numerous influencing factors.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija, Chronology of lost structural integrity initiated from manufacturing defects in welded structures",
pages = "50-39",
number = "1",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_rims_87"
}

Sedmak, S., Grabulov, V.,& Momčilović, D.. (2009). Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 9(1), 39-50.
https://hdl.handle.net/21.15107/rcub_rims_87

Sedmak S, Grabulov V, Momčilović D. Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija. in Integritet i vek konstrukcija. 2009;9(1):39-50.
https://hdl.handle.net/21.15107/rcub_rims_87 .

Sedmak, Stojan, Grabulov, Vencislav, Momčilović, Dejan, "Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija" in Integritet i vek konstrukcija, 9, no. 1 (2009):39-50,
https://hdl.handle.net/21.15107/rcub_rims_87 .

TY  - CONF
AU  - Grabulov, Vencislav
AU  - Jovicić, R.
AU  - Sedmak, Aleksandar
AU  - Odanović, Zoran
AU  - Petronić, S.
PY  - 2009
UR  - http://rims.institutims.rs/handle/123456789/106
AB  - An analysis of the influence of heterogeneity of the ferriteaustenite welded joint on its integrity has been performed. The Charpy specimens, with notch positioned in different regions of welded joint, have been tested using the instrumented pendulum to separate crack initiation and growth energy. In all cases tested (different heat input, room and low temperature, down to -60°C), weld metal had the lowest toughness, due to the presence of S ferrite, which was not the case in the heat affected zones, having surprisingly high toughness, including both crack initiation and growth energies. Finally, J-R curves have been obtained by using standard fracture mechanics testing procedure and compared with crack driving forces, obtained numerically using King's method, enabling estimation of influence of cracks on integrity of ferriteaustenite welded joints in cylindrical pressure vessel.
C3  - Welding in the World
T1  - An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure
EP  - 563
IS  - SPECIAL ISSUE
SP  - 559
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_rims_106
ER  - 

@conference{
author = "Grabulov, Vencislav and Jovicić, R. and Sedmak, Aleksandar and Odanović, Zoran and Petronić, S.",
year = "2009",
abstract = "An analysis of the influence of heterogeneity of the ferriteaustenite welded joint on its integrity has been performed. The Charpy specimens, with notch positioned in different regions of welded joint, have been tested using the instrumented pendulum to separate crack initiation and growth energy. In all cases tested (different heat input, room and low temperature, down to -60°C), weld metal had the lowest toughness, due to the presence of S ferrite, which was not the case in the heat affected zones, having surprisingly high toughness, including both crack initiation and growth energies. Finally, J-R curves have been obtained by using standard fracture mechanics testing procedure and compared with crack driving forces, obtained numerically using King's method, enabling estimation of influence of cracks on integrity of ferriteaustenite welded joints in cylindrical pressure vessel.",
journal = "Welding in the World",
title = "An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure",
pages = "563-559",
number = "SPECIAL ISSUE",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_rims_106"
}

Grabulov, V., Jovicić, R., Sedmak, A., Odanović, Z.,& Petronić, S.. (2009). An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure. in Welding in the World, 53(SPECIAL ISSUE), 559-563.
https://hdl.handle.net/21.15107/rcub_rims_106

Grabulov V, Jovicić R, Sedmak A, Odanović Z, Petronić S. An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure. in Welding in the World. 2009;53(SPECIAL ISSUE):559-563.
https://hdl.handle.net/21.15107/rcub_rims_106 .

Grabulov, Vencislav, Jovicić, R., Sedmak, Aleksandar, Odanović, Zoran, Petronić, S., "An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure" in Welding in the World, 53, no. SPECIAL ISSUE (2009):559-563,
https://hdl.handle.net/21.15107/rcub_rims_106 .