TY  - JOUR
AU  - Arsić, Miodrag
AU  - Arsić, Dušan
AU  - Flajs, Željko
AU  - Grbović, Aleksandar
AU  - Todić, Aleksandar
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/413
AB  - Loads at vital steel structures occur during their production and assembly (residual stresses), during the execution of functional tasks in exploitation (stationary and dynamic loads) and during the disturbed process of exploitation (non-stationary dynamic loads). Considering the fact that stress concentrators, corrosion and unpredictable effects that occur during exploitation must be taken into account as well, it is clear that loading of vital structures during the design phase can not be represented with a model in which the parameters change uniformly. Therefore only experimental non-destructive tests performed at large steel structures during exploitation enable the assessment of their current condition, need for particular repairs and assessment of integrity. In that way the data necessary for determination of causes of degradation of material and welded joints at structures, for the evaluation of mutual influence of equipment parts, as well as for determination of functionality and reliability of operation of drive systems. This primarily refers to vital steel structures of bucket-wheel excavators, dredgers and cranes, as well as to vital steel structures at hydroelectric equipment, thermal power plant equipment, bridges etc. This paper presents the analysis of causes for the occurrence of damages at the support structure of the boom of the bucket-wheel excavator, which is operating at the open pit coal mine near Kostolac (Serbia), that was executed on the basis of non-destructive tests. The paper also contains the procedure for the repair of damaged structure through the application of adequate welding, performed at existing and newly produced components, and the assessment of structural integrity after the repair based on non-compliances detected during the design process, as well as during the making of the support structure of the bucket-wheel excavator boom due to inadequate radiuses defined during the processes of design and production and due to the existence of flaws on the surface and within welded joints.
PB  - Pleiades Publishing Inc, New York
T2  - Russian Journal of Nondestructive Testing
T1  - Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures
EP  - 931
IS  - 10
SP  - 918
VL  - 57
DO  - 10.1134/S1061830921100053
ER  - 

@article{
author = "Arsić, Miodrag and Arsić, Dušan and Flajs, Željko and Grbović, Aleksandar and Todić, Aleksandar",
year = "2021",
abstract = "Loads at vital steel structures occur during their production and assembly (residual stresses), during the execution of functional tasks in exploitation (stationary and dynamic loads) and during the disturbed process of exploitation (non-stationary dynamic loads). Considering the fact that stress concentrators, corrosion and unpredictable effects that occur during exploitation must be taken into account as well, it is clear that loading of vital structures during the design phase can not be represented with a model in which the parameters change uniformly. Therefore only experimental non-destructive tests performed at large steel structures during exploitation enable the assessment of their current condition, need for particular repairs and assessment of integrity. In that way the data necessary for determination of causes of degradation of material and welded joints at structures, for the evaluation of mutual influence of equipment parts, as well as for determination of functionality and reliability of operation of drive systems. This primarily refers to vital steel structures of bucket-wheel excavators, dredgers and cranes, as well as to vital steel structures at hydroelectric equipment, thermal power plant equipment, bridges etc. This paper presents the analysis of causes for the occurrence of damages at the support structure of the boom of the bucket-wheel excavator, which is operating at the open pit coal mine near Kostolac (Serbia), that was executed on the basis of non-destructive tests. The paper also contains the procedure for the repair of damaged structure through the application of adequate welding, performed at existing and newly produced components, and the assessment of structural integrity after the repair based on non-compliances detected during the design process, as well as during the making of the support structure of the bucket-wheel excavator boom due to inadequate radiuses defined during the processes of design and production and due to the existence of flaws on the surface and within welded joints.",
publisher = "Pleiades Publishing Inc, New York",
journal = "Russian Journal of Nondestructive Testing",
title = "Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures",
pages = "931-918",
number = "10",
volume = "57",
doi = "10.1134/S1061830921100053"
}

Arsić, M., Arsić, D., Flajs, Ž., Grbović, A.,& Todić, A.. (2021). Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures. in Russian Journal of Nondestructive Testing
Pleiades Publishing Inc, New York., 57(10), 918-931.
https://doi.org/10.1134/S1061830921100053

Arsić M, Arsić D, Flajs Ž, Grbović A, Todić A. Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures. in Russian Journal of Nondestructive Testing. 2021;57(10):918-931.
doi:10.1134/S1061830921100053 .

Arsić, Miodrag, Arsić, Dušan, Flajs, Željko, Grbović, Aleksandar, Todić, Aleksandar, "Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures" in Russian Journal of Nondestructive Testing, 57, no. 10 (2021):918-931,
https://doi.org/10.1134/S1061830921100053 . .

TY  - CONF
AU  - Arsić, Dušan
AU  - Nikolić, Ružica
AU  - Lazić, Vukić
AU  - Arsić, Aleksandra
AU  - Savić, Zoran
AU  - Djacić, Slaviša
AU  - Hadzima, Branislav
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/372
AB  - Premature damages and fractures of components and structures of bucket-wheel excavators at open-pit mine often occur in exploitation, caused either by inadequate design or insufficient knowledge of the material properties, welded joints and flaws in component production technology. The bucket-wheel excavator, TAKRAF SRs 2000 x 32/5.0 was employed on the excavation of barren soil for 5.000 h (a few weeks more than a year after the assembly) when the fracture of the tooth of the girth gear, which enables the circular motion of the upper structure of the bucket-wheel excavator, occurred. The gear was, according to the manufacturer's certificate, made of the cast steel GS 40 MnCrSi3 V. The paper presents calculations of the stress variations cycles' number for one tooth, as well as of the fracture mechanics parameters - the critical stress intensity factor and critical crack length. It was established that the fracture of the tooth occurred due to an initial crack existing in its base, which originated during the gear's manufacturing, i.e. due to the so-called "manufacturing-in defect".
PB  - Elsevier, Amsterdam
C3  - 13th International Scientific Conference on Sustainable, Modern and Safe Transport (Transcom 2019)
T1  - Analysis of the cause of the girth gear tooth fracture occurrence at the bucket wheel excavator
EP  - 418
SP  - 413
VL  - 40
DO  - 10.1016/j.trpro.2019.07.060
ER  - 

@conference{
author = "Arsić, Dušan and Nikolić, Ružica and Lazić, Vukić and Arsić, Aleksandra and Savić, Zoran and Djacić, Slaviša and Hadzima, Branislav",
year = "2019",
abstract = "Premature damages and fractures of components and structures of bucket-wheel excavators at open-pit mine often occur in exploitation, caused either by inadequate design or insufficient knowledge of the material properties, welded joints and flaws in component production technology. The bucket-wheel excavator, TAKRAF SRs 2000 x 32/5.0 was employed on the excavation of barren soil for 5.000 h (a few weeks more than a year after the assembly) when the fracture of the tooth of the girth gear, which enables the circular motion of the upper structure of the bucket-wheel excavator, occurred. The gear was, according to the manufacturer's certificate, made of the cast steel GS 40 MnCrSi3 V. The paper presents calculations of the stress variations cycles' number for one tooth, as well as of the fracture mechanics parameters - the critical stress intensity factor and critical crack length. It was established that the fracture of the tooth occurred due to an initial crack existing in its base, which originated during the gear's manufacturing, i.e. due to the so-called "manufacturing-in defect".",
publisher = "Elsevier, Amsterdam",
journal = "13th International Scientific Conference on Sustainable, Modern and Safe Transport (Transcom 2019)",
title = "Analysis of the cause of the girth gear tooth fracture occurrence at the bucket wheel excavator",
pages = "418-413",
volume = "40",
doi = "10.1016/j.trpro.2019.07.060"
}

Arsić, D., Nikolić, R., Lazić, V., Arsić, A., Savić, Z., Djacić, S.,& Hadzima, B.. (2019). Analysis of the cause of the girth gear tooth fracture occurrence at the bucket wheel excavator. in 13th International Scientific Conference on Sustainable, Modern and Safe Transport (Transcom 2019)
Elsevier, Amsterdam., 40, 413-418.
https://doi.org/10.1016/j.trpro.2019.07.060

Arsić D, Nikolić R, Lazić V, Arsić A, Savić Z, Djacić S, Hadzima B. Analysis of the cause of the girth gear tooth fracture occurrence at the bucket wheel excavator. in 13th International Scientific Conference on Sustainable, Modern and Safe Transport (Transcom 2019). 2019;40:413-418.
doi:10.1016/j.trpro.2019.07.060 .

Arsić, Dušan, Nikolić, Ružica, Lazić, Vukić, Arsić, Aleksandra, Savić, Zoran, Djacić, Slaviša, Hadzima, Branislav, "Analysis of the cause of the girth gear tooth fracture occurrence at the bucket wheel excavator" in 13th International Scientific Conference on Sustainable, Modern and Safe Transport (Transcom 2019), 40 (2019):413-418,
https://doi.org/10.1016/j.trpro.2019.07.060 . .