TY  - CONF
AU  - Zečević, Bojana
AU  - Maksimović, Ana
AU  - Milović, Ljubica
AU  - Aleksić, Vujadin
AU  - Grbović, Aleksandar
AU  - Bulatović, Srđan
PY  - 2022
UR  - http://rims.institutims.rs/handle/123456789/624
AB  - Steel grade 14MoV6 3 is used for manufacturing of boilers and steam pipelines designed for steam temperatures up to 560°C. This paper presents the numerical simulation of a CT-specimen, using the finite element method. The analysis was performed using Ansys Workbench R21, and represents the initial stage of extensive research involving the behaviour of 14MoV6 3 steel. The goal was to simulate the real experimental conditions, including boundary conditions and loads, which were defined in accordance with relevant standards, and to obtain representative results. The temperature dependent mechanical properties needed for the simulation of plastic behaviour of such specimens under tensile loads were obtained from the experimental data and the literature.
PB  - Elsevier B.V.
C3  - 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity
T1  - Numerical simulation of 14Mov6-3 steel CT-specimen Fracture Behavior
VL  - 42
DO  - 10.1016/j.prostr.2022.12.189
ER  - 

@conference{
author = "Zečević, Bojana and Maksimović, Ana and Milović, Ljubica and Aleksić, Vujadin and Grbović, Aleksandar and Bulatović, Srđan",
year = "2022",
abstract = "Steel grade 14MoV6 3 is used for manufacturing of boilers and steam pipelines designed for steam temperatures up to 560°C. This paper presents the numerical simulation of a CT-specimen, using the finite element method. The analysis was performed using Ansys Workbench R21, and represents the initial stage of extensive research involving the behaviour of 14MoV6 3 steel. The goal was to simulate the real experimental conditions, including boundary conditions and loads, which were defined in accordance with relevant standards, and to obtain representative results. The temperature dependent mechanical properties needed for the simulation of plastic behaviour of such specimens under tensile loads were obtained from the experimental data and the literature.",
publisher = "Elsevier B.V.",
journal = "23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity",
title = "Numerical simulation of 14Mov6-3 steel CT-specimen Fracture Behavior",
volume = "42",
doi = "10.1016/j.prostr.2022.12.189"
}

Zečević, B., Maksimović, A., Milović, L., Aleksić, V., Grbović, A.,& Bulatović, S.. (2022). Numerical simulation of 14Mov6-3 steel CT-specimen Fracture Behavior. in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity
Elsevier B.V.., 42.
https://doi.org/10.1016/j.prostr.2022.12.189

Zečević B, Maksimović A, Milović L, Aleksić V, Grbović A, Bulatović S. Numerical simulation of 14Mov6-3 steel CT-specimen Fracture Behavior. in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity. 2022;42.
doi:10.1016/j.prostr.2022.12.189 .

Zečević, Bojana, Maksimović, Ana, Milović, Ljubica, Aleksić, Vujadin, Grbović, Aleksandar, Bulatović, Srđan, "Numerical simulation of 14Mov6-3 steel CT-specimen Fracture Behavior" in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity, 42 (2022),
https://doi.org/10.1016/j.prostr.2022.12.189 . .

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  - JOUR
AU  - Hemer, Abubkr
AU  - Milović, Ljubica
AU  - Grbović, Aleksandar
AU  - Aleksić, Bojana
AU  - Aleksić, Vujadin
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/378
AB  - Most of the serious weldment failures lead to catastrophic consequences in terms of damage of other equipment, loss of production, and risks to workers' health and safety. Hence, there is motivation to find margin between safety and disaster. This necessitates guaranteeing the integrity of a welded structure even if a crack is present. Therefore, influence of the material inhomogeneity and residual stresses on deformation and fracture behavior needs to be described precisely. Fracture mechanics parameters J - integral and CTOD have attracted great interest in recent years. Two three point bending specimens of base metal (BM) and weld metal (WM) were tested according to standard BS EN ISO 15653. Than, a two dimensional finite element analysis was performed in Ansys Workbench software to calculate J-integral, and compare with experimental results. The aim of this work is to explore the possibility of using the test results in the reliable prediction of weldment fracture.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Numerical determination and experimental validation of the fracture toughness of welded joints
VL  - 107
DO  - 10.1016/j.engfailanal.2019.104220
ER  - 

@article{
author = "Hemer, Abubkr and Milović, Ljubica and Grbović, Aleksandar and Aleksić, Bojana and Aleksić, Vujadin",
year = "2020",
abstract = "Most of the serious weldment failures lead to catastrophic consequences in terms of damage of other equipment, loss of production, and risks to workers' health and safety. Hence, there is motivation to find margin between safety and disaster. This necessitates guaranteeing the integrity of a welded structure even if a crack is present. Therefore, influence of the material inhomogeneity and residual stresses on deformation and fracture behavior needs to be described precisely. Fracture mechanics parameters J - integral and CTOD have attracted great interest in recent years. Two three point bending specimens of base metal (BM) and weld metal (WM) were tested according to standard BS EN ISO 15653. Than, a two dimensional finite element analysis was performed in Ansys Workbench software to calculate J-integral, and compare with experimental results. The aim of this work is to explore the possibility of using the test results in the reliable prediction of weldment fracture.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Numerical determination and experimental validation of the fracture toughness of welded joints",
volume = "107",
doi = "10.1016/j.engfailanal.2019.104220"
}

Hemer, A., Milović, L., Grbović, A., Aleksić, B.,& Aleksić, V.. (2020). Numerical determination and experimental validation of the fracture toughness of welded joints. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 107.
https://doi.org/10.1016/j.engfailanal.2019.104220

Hemer A, Milović L, Grbović A, Aleksić B, Aleksić V. Numerical determination and experimental validation of the fracture toughness of welded joints. in Engineering Failure Analysis. 2020;107.
doi:10.1016/j.engfailanal.2019.104220 .

Hemer, Abubkr, Milović, Ljubica, Grbović, Aleksandar, Aleksić, Bojana, Aleksić, Vujadin, "Numerical determination and experimental validation of the fracture toughness of welded joints" in Engineering Failure Analysis, 107 (2020),
https://doi.org/10.1016/j.engfailanal.2019.104220 . .

TY  - JOUR
AU  - Aleksić, Bojana
AU  - Grbović, Aleksandar
AU  - Milović, Ljubica
AU  - Hemer, Abubkr
AU  - Aleksić, Vujadin
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/370
AB  - In order to prevent the premature failure of steam pipeline produced of molybdenum-vanadium steel, the experimental tests were performed to measure fracture toughness and to determine the mechanical behaviour of cracked pipes. A finite element method was used to calculate the fracture behaviour of the pressurized pipeline made of 14MoV6-3 steel based on the J-integral computation. The J-R curves were experimentally obtained by the elastic unloading compliance method for the single edge notched bend specimens and compared with those obtained using finite element method. A two dimensional finite element analysis was performed in Ansys Workbench software to determine the stress distribution and calculate J-integral values for the selected specimen geometry. Special attention was paid to the influence of applied boundary conditions on the accuracy of J-integral values, as well as to the influence of mesh density. It is shown that numerically obtained J-values significantly depend on the number of nodes used to apply displacements. However, if recommendations proposed in this paper are implemented, the accuracy of calculated values is satisfactory and successful failure analysis can be carried out. This approach can be useful in engineering applications where time saving and costs reducing are required.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Numerical simulation of fatigue crack propagation: A case study of defected steam pipeline
VL  - 106
DO  - 10.1016/j.engfailanal.2019.104165
ER  - 

@article{
author = "Aleksić, Bojana and Grbović, Aleksandar and Milović, Ljubica and Hemer, Abubkr and Aleksić, Vujadin",
year = "2019",
abstract = "In order to prevent the premature failure of steam pipeline produced of molybdenum-vanadium steel, the experimental tests were performed to measure fracture toughness and to determine the mechanical behaviour of cracked pipes. A finite element method was used to calculate the fracture behaviour of the pressurized pipeline made of 14MoV6-3 steel based on the J-integral computation. The J-R curves were experimentally obtained by the elastic unloading compliance method for the single edge notched bend specimens and compared with those obtained using finite element method. A two dimensional finite element analysis was performed in Ansys Workbench software to determine the stress distribution and calculate J-integral values for the selected specimen geometry. Special attention was paid to the influence of applied boundary conditions on the accuracy of J-integral values, as well as to the influence of mesh density. It is shown that numerically obtained J-values significantly depend on the number of nodes used to apply displacements. However, if recommendations proposed in this paper are implemented, the accuracy of calculated values is satisfactory and successful failure analysis can be carried out. This approach can be useful in engineering applications where time saving and costs reducing are required.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Numerical simulation of fatigue crack propagation: A case study of defected steam pipeline",
volume = "106",
doi = "10.1016/j.engfailanal.2019.104165"
}

Aleksić, B., Grbović, A., Milović, L., Hemer, A.,& Aleksić, V.. (2019). Numerical simulation of fatigue crack propagation: A case study of defected steam pipeline. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 106.
https://doi.org/10.1016/j.engfailanal.2019.104165

Aleksić B, Grbović A, Milović L, Hemer A, Aleksić V. Numerical simulation of fatigue crack propagation: A case study of defected steam pipeline. in Engineering Failure Analysis. 2019;106.
doi:10.1016/j.engfailanal.2019.104165 .

Aleksić, Bojana, Grbović, Aleksandar, Milović, Ljubica, Hemer, Abubkr, Aleksić, Vujadin, "Numerical simulation of fatigue crack propagation: A case study of defected steam pipeline" in Engineering Failure Analysis, 106 (2019),
https://doi.org/10.1016/j.engfailanal.2019.104165 . .

TY  - CHAP
AU  - Aleksić, Bojana
AU  - Aleksić, Vujadin
AU  - Milović, Ljubica
AU  - Grbović, Aleksandar
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/772
PB  - Springer
T2  - Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture
T1  - Determination of the Region of Stabilization of Low-Cycle Fatigue HSLA Steel from Test Data
EP  - 112
SP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_rims_772
ER  - 

@inbook{
author = "Aleksić, Bojana and Aleksić, Vujadin and Milović, Ljubica and Grbović, Aleksandar",
year = "2018",
publisher = "Springer",
journal = "Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture",
booktitle = "Determination of the Region of Stabilization of Low-Cycle Fatigue HSLA Steel from Test Data",
pages = "112-101",
url = "https://hdl.handle.net/21.15107/rcub_rims_772"
}

Aleksić, B., Aleksić, V., Milović, L.,& Grbović, A.. (2018). Determination of the Region of Stabilization of Low-Cycle Fatigue HSLA Steel from Test Data. in Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture
Springer., 101-112.
https://hdl.handle.net/21.15107/rcub_rims_772

Aleksić B, Aleksić V, Milović L, Grbović A. Determination of the Region of Stabilization of Low-Cycle Fatigue HSLA Steel from Test Data. in Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture. 2018;:101-112.
https://hdl.handle.net/21.15107/rcub_rims_772 .

Aleksić, Bojana, Aleksić, Vujadin, Milović, Ljubica, Grbović, Aleksandar, "Determination of the Region of Stabilization of Low-Cycle Fatigue HSLA Steel from Test Data" in Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture (2018):101-112,
https://hdl.handle.net/21.15107/rcub_rims_772 .

TY  - CHAP
AU  - Zečević, Bojana
AU  - Grbović, Aleksandar
AU  - Hemer, Abubkr
AU  - Milović, Ljubica
AU  - Aleksić, Vujadin
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/776
PB  - Springer
T2  - Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture
T1  - Evaluation of Stress Intensity Factors (SIFs) Using Extended Finite Element Method (XFEM)
EP  - 369
SP  - 355
UR  - https://hdl.handle.net/21.15107/rcub_rims_776
ER  - 

@inbook{
author = "Zečević, Bojana and Grbović, Aleksandar and Hemer, Abubkr and Milović, Ljubica and Aleksić, Vujadin",
year = "2018",
publisher = "Springer",
journal = "Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture",
booktitle = "Evaluation of Stress Intensity Factors (SIFs) Using Extended Finite Element Method (XFEM)",
pages = "369-355",
url = "https://hdl.handle.net/21.15107/rcub_rims_776"
}

Zečević, B., Grbović, A., Hemer, A., Milović, L.,& Aleksić, V.. (2018). Evaluation of Stress Intensity Factors (SIFs) Using Extended Finite Element Method (XFEM). in Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture
Springer., 355-369.
https://hdl.handle.net/21.15107/rcub_rims_776

Zečević B, Grbović A, Hemer A, Milović L, Aleksić V. Evaluation of Stress Intensity Factors (SIFs) Using Extended Finite Element Method (XFEM). in Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture. 2018;:355-369.
https://hdl.handle.net/21.15107/rcub_rims_776 .

Zečević, Bojana, Grbović, Aleksandar, Hemer, Abubkr, Milović, Ljubica, Aleksić, Vujadin, "Evaluation of Stress Intensity Factors (SIFs) Using Extended Finite Element Method (XFEM)" in Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture (2018):355-369,
https://hdl.handle.net/21.15107/rcub_rims_776 .

TY  - CONF
AU  - Aleksić, Bojana
AU  - Milović, Ljubica
AU  - Grbović, Aleksandar
AU  - Hemer, Abubkr
AU  - Aleksić, Vujadin
AU  - Zrilić, Milorad
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/349
AB  - Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This grade is designed mainly for power industry applications, withstanding operating at elevated temperatures.In this paper, mechanical properties of steel grade 14MoV6-3 and methodology of calculation of critical values of the J-integral are presented. The level of damage is determined by analyzing the virgin material of the same grade. The focus of presented investigation is on the experimental J integral determination, where critical values of the J-integral (J(IC)) are compared with the values obtained by using the finite element methods (FEM). FEM model was defined on the basis of experimental conditions and obtained numerical values should confirm our experimental results.
PB  - Elsevier Science Bv, Amsterdam
C3  - ECF22 - Loading and Environmental Effects on Structural Integrity
T1  - Experimental and numerical investigations of the critical values of J-integral for the steel of steam pipelines
EP  - 1594
SP  - 1589
VL  - 13
DO  - 10.1016/j.prostr.2018.12.335
ER  - 

@conference{
author = "Aleksić, Bojana and Milović, Ljubica and Grbović, Aleksandar and Hemer, Abubkr and Aleksić, Vujadin and Zrilić, Milorad",
year = "2018",
abstract = "Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This grade is designed mainly for power industry applications, withstanding operating at elevated temperatures.In this paper, mechanical properties of steel grade 14MoV6-3 and methodology of calculation of critical values of the J-integral are presented. The level of damage is determined by analyzing the virgin material of the same grade. The focus of presented investigation is on the experimental J integral determination, where critical values of the J-integral (J(IC)) are compared with the values obtained by using the finite element methods (FEM). FEM model was defined on the basis of experimental conditions and obtained numerical values should confirm our experimental results.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "ECF22 - Loading and Environmental Effects on Structural Integrity",
title = "Experimental and numerical investigations of the critical values of J-integral for the steel of steam pipelines",
pages = "1594-1589",
volume = "13",
doi = "10.1016/j.prostr.2018.12.335"
}

Aleksić, B., Milović, L., Grbović, A., Hemer, A., Aleksić, V.,& Zrilić, M.. (2018). Experimental and numerical investigations of the critical values of J-integral for the steel of steam pipelines. in ECF22 - Loading and Environmental Effects on Structural Integrity
Elsevier Science Bv, Amsterdam., 13, 1589-1594.
https://doi.org/10.1016/j.prostr.2018.12.335

Aleksić B, Milović L, Grbović A, Hemer A, Aleksić V, Zrilić M. Experimental and numerical investigations of the critical values of J-integral for the steel of steam pipelines. in ECF22 - Loading and Environmental Effects on Structural Integrity. 2018;13:1589-1594.
doi:10.1016/j.prostr.2018.12.335 .

Aleksić, Bojana, Milović, Ljubica, Grbović, Aleksandar, Hemer, Abubkr, Aleksić, Vujadin, Zrilić, Milorad, "Experimental and numerical investigations of the critical values of J-integral for the steel of steam pipelines" in ECF22 - Loading and Environmental Effects on Structural Integrity, 13 (2018):1589-1594,
https://doi.org/10.1016/j.prostr.2018.12.335 . .