TY  - JOUR
AU  - Jelić, Mirjana
AU  - Sedmak, Aleksandar
AU  - Folić, Boris
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
AU  - Folić, Radomir
AU  - Radu, Dorin
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7779
AB  - Belgrade fair hall 1 is well known for its dome, which is still the world largest self-supported construction made of pre-stressed concrete, with its diameter of 106 m. In this paper the Finite Element Method (FEM) was performed to analyze different loading and supporting conditions. At the same time, crack growth in a support column was simulated by the extended FEM (XFEM). Results of numerical calculations indicate ingenious design of such a complex structure which was based on “hand” calculation decades ago, without computers. In addition to classical engineering and more advanced numerical calculations, risk based analysis was performed taking into account artificially introduced crack and Failure Analysis Diagram, obtained using stress intensity factor and net stress, as well as fracture toughness and critical stress. This analysis, made for the first time for Belgrade fair hall 1, proved that its structural integrity is jeopardized only when a crack reaches half the thickness of a steel bar.
T2  - Frattura ed Integrita Strutturale
T1  - Structural integrity analysis of the pre-stressed concrete dome of the Belgrade fair hall 1
EP  - 351
IS  - 67
SP  - 337
VL  - 18
DO  - 10.3221/IGF-ESIS.67.24
ER  - 

@article{
author = "Jelić, Mirjana and Sedmak, Aleksandar and Folić, Boris and Sedmak, Simon and Aranđelović, Mihajlo and Folić, Radomir and Radu, Dorin",
year = "2024",
abstract = "Belgrade fair hall 1 is well known for its dome, which is still the world largest self-supported construction made of pre-stressed concrete, with its diameter of 106 m. In this paper the Finite Element Method (FEM) was performed to analyze different loading and supporting conditions. At the same time, crack growth in a support column was simulated by the extended FEM (XFEM). Results of numerical calculations indicate ingenious design of such a complex structure which was based on “hand” calculation decades ago, without computers. In addition to classical engineering and more advanced numerical calculations, risk based analysis was performed taking into account artificially introduced crack and Failure Analysis Diagram, obtained using stress intensity factor and net stress, as well as fracture toughness and critical stress. This analysis, made for the first time for Belgrade fair hall 1, proved that its structural integrity is jeopardized only when a crack reaches half the thickness of a steel bar.",
journal = "Frattura ed Integrita Strutturale",
title = "Structural integrity analysis of the pre-stressed concrete dome of the Belgrade fair hall 1",
pages = "351-337",
number = "67",
volume = "18",
doi = "10.3221/IGF-ESIS.67.24"
}

Jelić, M., Sedmak, A., Folić, B., Sedmak, S., Aranđelović, M., Folić, R.,& Radu, D.. (2024). Structural integrity analysis of the pre-stressed concrete dome of the Belgrade fair hall 1. in Frattura ed Integrita Strutturale, 18(67), 337-351.
https://doi.org/10.3221/IGF-ESIS.67.24

Jelić M, Sedmak A, Folić B, Sedmak S, Aranđelović M, Folić R, Radu D. Structural integrity analysis of the pre-stressed concrete dome of the Belgrade fair hall 1. in Frattura ed Integrita Strutturale. 2024;18(67):337-351.
doi:10.3221/IGF-ESIS.67.24 .

Jelić, Mirjana, Sedmak, Aleksandar, Folić, Boris, Sedmak, Simon, Aranđelović, Mihajlo, Folić, Radomir, Radu, Dorin, "Structural integrity analysis of the pre-stressed concrete dome of the Belgrade fair hall 1" in Frattura ed Integrita Strutturale, 18, no. 67 (2024):337-351,
https://doi.org/10.3221/IGF-ESIS.67.24 . .

TY  - JOUR
AU  - Aranđelović, Mihajlo
AU  - Đorđević, Branislav R.
AU  - Sedmak, Simon
AU  - Radu, Dorin
AU  - Petrović, Ana
AU  - Dikić, Stefan
AU  - Sedmak, Aleksandar
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7776
AB  - Failure analysis of welded joint with multiple defects was performed taking into account the effect of all defects, not just a dominant one. Four cases of multiple defects in welded joint under the uniaxial tensile loading were investigated using extended Finite Element Method. Two-dimensional Finite Element Models were made according to the tensile specimens with initial crack located in a critical area of welded joint. For each multiple defects case, numerical simulation was performed with three initial crack depth. Engineering Critical Analysis was made using Failure Assessment Diagrams for each defect that was determined as critical for its welded joint case. Numerical simulation showed that the geometry of the most prominent one from a point of view of structural integrity. It was concluded that the vertical misalignment in combination with a secondary defect, had the most adverse effect which can lead to failure of welded structure.
PB  - Elsevier
T2  - Engineering Failure Analysis
T1  - Failure analysis of welded joint with multiple defects by extended Finite Element Method and Engineering Critical Analysis
SP  - 108176
VL  - 160
DO  - 10.1016/j.engfailanal.2024.108176
ER  - 

@article{
author = "Aranđelović, Mihajlo and Đorđević, Branislav R. and Sedmak, Simon and Radu, Dorin and Petrović, Ana and Dikić, Stefan and Sedmak, Aleksandar",
year = "2024",
abstract = "Failure analysis of welded joint with multiple defects was performed taking into account the effect of all defects, not just a dominant one. Four cases of multiple defects in welded joint under the uniaxial tensile loading were investigated using extended Finite Element Method. Two-dimensional Finite Element Models were made according to the tensile specimens with initial crack located in a critical area of welded joint. For each multiple defects case, numerical simulation was performed with three initial crack depth. Engineering Critical Analysis was made using Failure Assessment Diagrams for each defect that was determined as critical for its welded joint case. Numerical simulation showed that the geometry of the most prominent one from a point of view of structural integrity. It was concluded that the vertical misalignment in combination with a secondary defect, had the most adverse effect which can lead to failure of welded structure.",
publisher = "Elsevier",
journal = "Engineering Failure Analysis",
title = "Failure analysis of welded joint with multiple defects by extended Finite Element Method and Engineering Critical Analysis",
pages = "108176",
volume = "160",
doi = "10.1016/j.engfailanal.2024.108176"
}

Aranđelović, M., Đorđević, B. R., Sedmak, S., Radu, D., Petrović, A., Dikić, S.,& Sedmak, A.. (2024). Failure analysis of welded joint with multiple defects by extended Finite Element Method and Engineering Critical Analysis. in Engineering Failure Analysis
Elsevier., 160, 108176.
https://doi.org/10.1016/j.engfailanal.2024.108176

Aranđelović M, Đorđević BR, Sedmak S, Radu D, Petrović A, Dikić S, Sedmak A. Failure analysis of welded joint with multiple defects by extended Finite Element Method and Engineering Critical Analysis. in Engineering Failure Analysis. 2024;160:108176.
doi:10.1016/j.engfailanal.2024.108176 .

Aranđelović, Mihajlo, Đorđević, Branislav R., Sedmak, Simon, Radu, Dorin, Petrović, Ana, Dikić, Stefan, Sedmak, Aleksandar, "Failure analysis of welded joint with multiple defects by extended Finite Element Method and Engineering Critical Analysis" in Engineering Failure Analysis, 160 (2024):108176,
https://doi.org/10.1016/j.engfailanal.2024.108176 . .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Radu, Dorin
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Bancila, Radu
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7777
AB  - Numerous roads and railways network steel bridges exist with more than 100 years in service, often of great historical value. The in-service safety assessment of these structures is a complex problem which requires interdisciplinary approaches – from civil engineering application of Eurocodes or European recommendation for fatigue life estimation, up to an in-depth assessment by means of fracture mechanics. This article emphasizes the importance of rehabilitating the structure of existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures. Toward this aim, the study case for a historical riveted steel bridge build in the beginning of the twentieth century is presented, with an assessment method considering the structural integrity by means of fracture mechanics. Based on this case study, the paper is proposing an algorithm to assess historical steel bridges. The results of in-depth XFEM analysis with different crack size in the area of a riveted joint are also presented, in order to validate the algorithm.
PB  - Elsevier
T2  - Engineering Fracture Mechanics
T1  - Residual life assessment of the historical road riveted bridges
SP  - 109960
VL  - 299
DO  - 10.1016/j.engfracmech.2024.109960
ER  - 

@article{
author = "Sedmak, Aleksandar and Radu, Dorin and Aranđelović, Mihajlo and Sedmak, Simon and Bancila, Radu",
year = "2024",
abstract = "Numerous roads and railways network steel bridges exist with more than 100 years in service, often of great historical value. The in-service safety assessment of these structures is a complex problem which requires interdisciplinary approaches – from civil engineering application of Eurocodes or European recommendation for fatigue life estimation, up to an in-depth assessment by means of fracture mechanics. This article emphasizes the importance of rehabilitating the structure of existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures. Toward this aim, the study case for a historical riveted steel bridge build in the beginning of the twentieth century is presented, with an assessment method considering the structural integrity by means of fracture mechanics. Based on this case study, the paper is proposing an algorithm to assess historical steel bridges. The results of in-depth XFEM analysis with different crack size in the area of a riveted joint are also presented, in order to validate the algorithm.",
publisher = "Elsevier",
journal = "Engineering Fracture Mechanics",
title = "Residual life assessment of the historical road riveted bridges",
pages = "109960",
volume = "299",
doi = "10.1016/j.engfracmech.2024.109960"
}

Sedmak, A., Radu, D., Aranđelović, M., Sedmak, S.,& Bancila, R.. (2024). Residual life assessment of the historical road riveted bridges. in Engineering Fracture Mechanics
Elsevier., 299, 109960.
https://doi.org/10.1016/j.engfracmech.2024.109960

Sedmak A, Radu D, Aranđelović M, Sedmak S, Bancila R. Residual life assessment of the historical road riveted bridges. in Engineering Fracture Mechanics. 2024;299:109960.
doi:10.1016/j.engfracmech.2024.109960 .

Sedmak, Aleksandar, Radu, Dorin, Aranđelović, Mihajlo, Sedmak, Simon, Bancila, Radu, "Residual life assessment of the historical road riveted bridges" in Engineering Fracture Mechanics, 299 (2024):109960,
https://doi.org/10.1016/j.engfracmech.2024.109960 . .

TY  - CONF
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Aleksandar
AU  - Petrović, Ana
AU  - Đorđević, Branislav
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6027
AB  - Simulation of crack initiation and propagation which occurred during the tensile
testing of real welded joint specimens made of low-alloyed low-carbon structural
steels is presented in this paper. Welded joints in questions were made with a
number of different defect combinations [1-3], such as excess weld metal, undercuts,
vertical misalignment and incomplete root penetration. Tensile tests were performed
on specimens divided into four groups according to their defect combinations, along
with numerical simulations using finite element method [4-6]. Once numerical models
which were valid in terms of stress and strain distribution were obtained, cracks were
introduced in the most critical locations, which corresponded to the real specimen
locations were failure of specimens initiated. The goal was to observe the behaviour
of models in the presence of these cracks, since in the case of experimental
specimens, fracture behaviour was often unconventional, due to complex geometry
which caused them to deform in unexpected manner. This geometry was influenced
by the presence of multiple different defects in the welded joint, and in some cases
even resulted in stress states that were not uniaxial, as is usually the case with
experiments and simulations like the one presented here
C3  - The 27th International Conference on Fracture and Structural Integrity
T1  - Numerical simulation of crack growth in welded joints in the presence of multiple defects
SP  - 178
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6027
ER  - 

@conference{
author = "Sedmak, Simon and Aranđelović, Mihajlo and Sedmak, Aleksandar and Petrović, Ana and Đorđević, Branislav",
year = "2023",
abstract = "Simulation of crack initiation and propagation which occurred during the tensile
testing of real welded joint specimens made of low-alloyed low-carbon structural
steels is presented in this paper. Welded joints in questions were made with a
number of different defect combinations [1-3], such as excess weld metal, undercuts,
vertical misalignment and incomplete root penetration. Tensile tests were performed
on specimens divided into four groups according to their defect combinations, along
with numerical simulations using finite element method [4-6]. Once numerical models
which were valid in terms of stress and strain distribution were obtained, cracks were
introduced in the most critical locations, which corresponded to the real specimen
locations were failure of specimens initiated. The goal was to observe the behaviour
of models in the presence of these cracks, since in the case of experimental
specimens, fracture behaviour was often unconventional, due to complex geometry
which caused them to deform in unexpected manner. This geometry was influenced
by the presence of multiple different defects in the welded joint, and in some cases
even resulted in stress states that were not uniaxial, as is usually the case with
experiments and simulations like the one presented here",
journal = "The 27th International Conference on Fracture and Structural Integrity",
title = "Numerical simulation of crack growth in welded joints in the presence of multiple defects",
pages = "178",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6027"
}

Sedmak, S., Aranđelović, M., Sedmak, A., Petrović, A.,& Đorđević, B.. (2023). Numerical simulation of crack growth in welded joints in the presence of multiple defects. in The 27th International Conference on Fracture and Structural Integrity, 178.
https://hdl.handle.net/21.15107/rcub_machinery_6027

Sedmak S, Aranđelović M, Sedmak A, Petrović A, Đorđević B. Numerical simulation of crack growth in welded joints in the presence of multiple defects. in The 27th International Conference on Fracture and Structural Integrity. 2023;:178.
https://hdl.handle.net/21.15107/rcub_machinery_6027 .

Sedmak, Simon, Aranđelović, Mihajlo, Sedmak, Aleksandar, Petrović, Ana, Đorđević, Branislav, "Numerical simulation of crack growth in welded joints in the presence of multiple defects" in The 27th International Conference on Fracture and Structural Integrity (2023):178,
https://hdl.handle.net/21.15107/rcub_machinery_6027 .

TY  - CONF
AU  - Dikić, Stefan
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Petrović, Ana
AU  - Đorđević, Branislav
PY  - 2023
UR  - https://www.sciencedirect.com/journal/procedia-structural-integrity/vol/48/suppl/C
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7103
AB  - This paper is based on extensive research about the influence of multiple different welded joint defects on the integrity of welded structures. In this particular case, the focus was on the heat affected zone and its different sub regions - up to this point, it was observed as a whole, with homogeneous mechanical properties along its cross-section. Due to the need to describe its behaviour in more detail, it was concluded that metallographic characterisation of the heat affected zone is necessary. Metallographic tests have provided a detailed insight into the micro-structures with the heat affected zone, which would be difficult to predict in this case, due to specific conditions, i.e., a welding technology which was adopted with the purpose of deliberately causing a number of defects in the welded joint. This would result in a more realistic distribution of mechanical properties along the heat affected zone, which in turn would provide more accurate input data for numerical simulations, since the use of finite element method will be the next step in this research.
PB  - Elsevier B.V.
C3  - Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023)
T1  - Metallographic characterization of the heat affected zone in welded joints with multiple defects
EP  - 265
SP  - 260
VL  - 48
DO  - 10.1016/j.prostr.2023.07.134
ER  - 

@conference{
author = "Dikić, Stefan and Aranđelović, Mihajlo and Sedmak, Simon and Petrović, Ana and Đorđević, Branislav",
year = "2023",
abstract = "This paper is based on extensive research about the influence of multiple different welded joint defects on the integrity of welded structures. In this particular case, the focus was on the heat affected zone and its different sub regions - up to this point, it was observed as a whole, with homogeneous mechanical properties along its cross-section. Due to the need to describe its behaviour in more detail, it was concluded that metallographic characterisation of the heat affected zone is necessary. Metallographic tests have provided a detailed insight into the micro-structures with the heat affected zone, which would be difficult to predict in this case, due to specific conditions, i.e., a welding technology which was adopted with the purpose of deliberately causing a number of defects in the welded joint. This would result in a more realistic distribution of mechanical properties along the heat affected zone, which in turn would provide more accurate input data for numerical simulations, since the use of finite element method will be the next step in this research.",
publisher = "Elsevier B.V.",
journal = "Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023)",
title = "Metallographic characterization of the heat affected zone in welded joints with multiple defects",
pages = "265-260",
volume = "48",
doi = "10.1016/j.prostr.2023.07.134"
}

Dikić, S., Aranđelović, M., Sedmak, S., Petrović, A.,& Đorđević, B.. (2023). Metallographic characterization of the heat affected zone in welded joints with multiple defects. in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023)
Elsevier B.V.., 48, 260-265.
https://doi.org/10.1016/j.prostr.2023.07.134

Dikić S, Aranđelović M, Sedmak S, Petrović A, Đorđević B. Metallographic characterization of the heat affected zone in welded joints with multiple defects. in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023). 2023;48:260-265.
doi:10.1016/j.prostr.2023.07.134 .

Dikić, Stefan, Aranđelović, Mihajlo, Sedmak, Simon, Petrović, Ana, Đorđević, Branislav, "Metallographic characterization of the heat affected zone in welded joints with multiple defects" in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023), 48 (2023):260-265,
https://doi.org/10.1016/j.prostr.2023.07.134 . .

TY  - JOUR
AU  - Vučetić, Filip
AU  - Đorđević, Branislav
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Milošević, Nenad
AU  - Radu, Dorin
AU  - Jeremić, Lazar
PY  - 2023
UR  - http://divk.inovacionicentar.rs/ivk/ivk23/OF2301-15.html
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7104
AB  - The research covers the investigation of mechanical properties of welded joint made on NiCr21Mo alloy (commercial trademark Incoloy 825), and joints of steels P355GH and X2CrNiMo17-12-2, as well as the influence of the achieved mechanical properties on structural integrity. Ongoing research is oriented on welded joints made of NiCr21Mo, i.e., the alloy to be introduced for certain parts (made of the aforementioned materials P355GH and X2CrNiMo17-12-2) of processing equipment exposed to elevated temperatures and high corrosive environment. Three preliminary welding technologies are presented in the first part of the paper. Tungsten inert gas (TIG) welding technique is used due to the type of filler material. The filler material features mechanical properties that provide an overmatching effect. After non-destructive tests (NDT), mechanical properties of all three welded joints are examined according to criteria that guarantee safe work and welded component integrity. In addition to mechanical tests (uniaxial tension, bending, impact toughness, hardness measurements), a microstructural analysis is performed to verify the applied preliminary welding technologies and evaluate the integrity of the obtained joints. After analysing all tests it is confirmed that the application of the preliminary welding technology has met all the requirements according to the applied criteria.
PB  - Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“, Institut za ispitivanje materijala (IMS), Beograd
T2  - Structural Integrity and Life
T1  - Integrity of Welded Joints Made of Alloy NiCr21Mo
EP  - 97
IS  - 1
SP  - 91
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7104
ER  - 

@article{
author = "Vučetić, Filip and Đorđević, Branislav and Aranđelović, Mihajlo and Sedmak, Simon and Milošević, Nenad and Radu, Dorin and Jeremić, Lazar",
year = "2023",
abstract = "The research covers the investigation of mechanical properties of welded joint made on NiCr21Mo alloy (commercial trademark Incoloy 825), and joints of steels P355GH and X2CrNiMo17-12-2, as well as the influence of the achieved mechanical properties on structural integrity. Ongoing research is oriented on welded joints made of NiCr21Mo, i.e., the alloy to be introduced for certain parts (made of the aforementioned materials P355GH and X2CrNiMo17-12-2) of processing equipment exposed to elevated temperatures and high corrosive environment. Three preliminary welding technologies are presented in the first part of the paper. Tungsten inert gas (TIG) welding technique is used due to the type of filler material. The filler material features mechanical properties that provide an overmatching effect. After non-destructive tests (NDT), mechanical properties of all three welded joints are examined according to criteria that guarantee safe work and welded component integrity. In addition to mechanical tests (uniaxial tension, bending, impact toughness, hardness measurements), a microstructural analysis is performed to verify the applied preliminary welding technologies and evaluate the integrity of the obtained joints. After analysing all tests it is confirmed that the application of the preliminary welding technology has met all the requirements according to the applied criteria.",
publisher = "Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“, Institut za ispitivanje materijala (IMS), Beograd",
journal = "Structural Integrity and Life",
title = "Integrity of Welded Joints Made of Alloy NiCr21Mo",
pages = "97-91",
number = "1",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7104"
}

Vučetić, F., Đorđević, B., Aranđelović, M., Sedmak, S., Milošević, N., Radu, D.,& Jeremić, L.. (2023). Integrity of Welded Joints Made of Alloy NiCr21Mo. in Structural Integrity and Life
Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“, Institut za ispitivanje materijala (IMS), Beograd., 23(1), 91-97.
https://hdl.handle.net/21.15107/rcub_machinery_7104

Vučetić F, Đorđević B, Aranđelović M, Sedmak S, Milošević N, Radu D, Jeremić L. Integrity of Welded Joints Made of Alloy NiCr21Mo. in Structural Integrity and Life. 2023;23(1):91-97.
https://hdl.handle.net/21.15107/rcub_machinery_7104 .

Vučetić, Filip, Đorđević, Branislav, Aranđelović, Mihajlo, Sedmak, Simon, Milošević, Nenad, Radu, Dorin, Jeremić, Lazar, "Integrity of Welded Joints Made of Alloy NiCr21Mo" in Structural Integrity and Life, 23, no. 1 (2023):91-97,
https://hdl.handle.net/21.15107/rcub_machinery_7104 .

TY  - JOUR
AU  - Aranđelović, Mihajlo
AU  - Petrović, Ana
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Dikić, Stefan
AU  - Radu, Dorin
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6010
AB  - The research represents the ongoing investigation of the welded joints behavior made
of low-carbon low-alloyed steel in the presence of different multiple defects. Following the initial
experimental and numerical analyses performed on low-grade steel, a set of experiments were
performed with specimens made of steel EN 1.0044 (commercial designation S275JR), along with
development of new numerical models. Four combinations were made, including defects like
undercuts, excess weld metal, misalignment, weld face sagging and incomplete root penetration,
considering that these defects are often encountered in practice, and can appear simultaneously. The finite element method (FEM) was used to simulate the experiments. Tensile properties of the HAZ and weld metal were calculated using strain measurements by the digital image correlation (DIC) method. The finite element method (FEM) results were in good agreement with the experimental ones.
PB  - MDPI
T2  - Sustainability
T1  - Effects of Multiple Defects on Welded Joint Behaviour under the Uniaxial Tensile Loading: Fem and Experimental Approach
IS  - 1
VL  - 15
DO  - doi.org/10.3390/su15010761
ER  - 

@article{
author = "Aranđelović, Mihajlo and Petrović, Ana and Đorđević, Branislav and Sedmak, Simon and Sedmak, Aleksandar and Dikić, Stefan and Radu, Dorin",
year = "2023",
abstract = "The research represents the ongoing investigation of the welded joints behavior made
of low-carbon low-alloyed steel in the presence of different multiple defects. Following the initial
experimental and numerical analyses performed on low-grade steel, a set of experiments were
performed with specimens made of steel EN 1.0044 (commercial designation S275JR), along with
development of new numerical models. Four combinations were made, including defects like
undercuts, excess weld metal, misalignment, weld face sagging and incomplete root penetration,
considering that these defects are often encountered in practice, and can appear simultaneously. The finite element method (FEM) was used to simulate the experiments. Tensile properties of the HAZ and weld metal were calculated using strain measurements by the digital image correlation (DIC) method. The finite element method (FEM) results were in good agreement with the experimental ones.",
publisher = "MDPI",
journal = "Sustainability",
title = "Effects of Multiple Defects on Welded Joint Behaviour under the Uniaxial Tensile Loading: Fem and Experimental Approach",
number = "1",
volume = "15",
doi = "doi.org/10.3390/su15010761"
}

Aranđelović, M., Petrović, A., Đorđević, B., Sedmak, S., Sedmak, A., Dikić, S.,& Radu, D.. (2023). Effects of Multiple Defects on Welded Joint Behaviour under the Uniaxial Tensile Loading: Fem and Experimental Approach. in Sustainability
MDPI., 15(1).
https://doi.org/doi.org/10.3390/su15010761

Aranđelović M, Petrović A, Đorđević B, Sedmak S, Sedmak A, Dikić S, Radu D. Effects of Multiple Defects on Welded Joint Behaviour under the Uniaxial Tensile Loading: Fem and Experimental Approach. in Sustainability. 2023;15(1).
doi:doi.org/10.3390/su15010761 .

Aranđelović, Mihajlo, Petrović, Ana, Đorđević, Branislav, Sedmak, Simon, Sedmak, Aleksandar, Dikić, Stefan, Radu, Dorin, "Effects of Multiple Defects on Welded Joint Behaviour under the Uniaxial Tensile Loading: Fem and Experimental Approach" in Sustainability, 15, no. 1 (2023),
https://doi.org/doi.org/10.3390/su15010761 . .

TY  - CONF
AU  - Petrović, Ana
AU  - Momčilović, Nikola
AU  - Aranđelović, Mihajlo
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6026
AB  - In this paper, a material characterization inverse methodology is used to obtain
structural parameters for all welded joint regions. Furthermore, such are applied for
the more realistic analysis of the pipeline numerical model structural response.
Material characterization methodology included tensile testing of specimen
containing welded joint. During the experiment strain field was continuously
measured using stereo cameras, and results are processed using system based on
Digital Image Correlation. Numerical computational model of test pipe is formed
using the same parameters, as in the experiment (shape of welded joint, boundary
conditions, loads, etc.). To improve numerical model, deformations of all regions of
welded joint (base material, weld metal, and heat affected zone) are imported into
numerical model. Consequently, material properties (Young’s modulus of elasticity,
yield strength, tensile strength) of all three welded joint regions were obtained.
Material properties are then used in analysis of welded joint influence to structural
integrity. Three different numerical computational models are produced. The first
model represents the classical approach in which the welded joint parameters are
not considered. The second model contained welded joints, but with orientational
mechanical properties of base and weld metal, and with heat affected zone having
properties same as base material. The third one included properties of all three
welded joint regions, obtained using inverse methodology. Results showed that there
is no difference between the models during service operations (elastic structural
behaviour). However, within the plastic deformation domain, which for instance,
accounts for hydraulic shocks, the differences are considerable. When orientational
mechanical properties of base and weld material are included, stress concentration
in welded joint is 1.59. When real properties of material are included, stress
concentration is decreased to 1.49, while stress gradient in welded joint area is
smaller than in previous model. Thus, welded joint modelling can vastly influence the
plastic domain structural behaviour of the pipeline structure.
C3  - The 27th International Conference on Fracture and Structural Integrity
T1  - Influence of mechanical properties of welded joint regions on pipeline structural integrity
EP  - 183
SP  - 182
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6026
ER  - 

@conference{
author = "Petrović, Ana and Momčilović, Nikola and Aranđelović, Mihajlo and Đorđević, Branislav and Sedmak, Simon",
year = "2023",
abstract = "In this paper, a material characterization inverse methodology is used to obtain
structural parameters for all welded joint regions. Furthermore, such are applied for
the more realistic analysis of the pipeline numerical model structural response.
Material characterization methodology included tensile testing of specimen
containing welded joint. During the experiment strain field was continuously
measured using stereo cameras, and results are processed using system based on
Digital Image Correlation. Numerical computational model of test pipe is formed
using the same parameters, as in the experiment (shape of welded joint, boundary
conditions, loads, etc.). To improve numerical model, deformations of all regions of
welded joint (base material, weld metal, and heat affected zone) are imported into
numerical model. Consequently, material properties (Young’s modulus of elasticity,
yield strength, tensile strength) of all three welded joint regions were obtained.
Material properties are then used in analysis of welded joint influence to structural
integrity. Three different numerical computational models are produced. The first
model represents the classical approach in which the welded joint parameters are
not considered. The second model contained welded joints, but with orientational
mechanical properties of base and weld metal, and with heat affected zone having
properties same as base material. The third one included properties of all three
welded joint regions, obtained using inverse methodology. Results showed that there
is no difference between the models during service operations (elastic structural
behaviour). However, within the plastic deformation domain, which for instance,
accounts for hydraulic shocks, the differences are considerable. When orientational
mechanical properties of base and weld material are included, stress concentration
in welded joint is 1.59. When real properties of material are included, stress
concentration is decreased to 1.49, while stress gradient in welded joint area is
smaller than in previous model. Thus, welded joint modelling can vastly influence the
plastic domain structural behaviour of the pipeline structure.",
journal = "The 27th International Conference on Fracture and Structural Integrity",
title = "Influence of mechanical properties of welded joint regions on pipeline structural integrity",
pages = "183-182",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6026"
}

Petrović, A., Momčilović, N., Aranđelović, M., Đorđević, B.,& Sedmak, S.. (2023). Influence of mechanical properties of welded joint regions on pipeline structural integrity. in The 27th International Conference on Fracture and Structural Integrity, 182-183.
https://hdl.handle.net/21.15107/rcub_machinery_6026

Petrović A, Momčilović N, Aranđelović M, Đorđević B, Sedmak S. Influence of mechanical properties of welded joint regions on pipeline structural integrity. in The 27th International Conference on Fracture and Structural Integrity. 2023;:182-183.
https://hdl.handle.net/21.15107/rcub_machinery_6026 .

Petrović, Ana, Momčilović, Nikola, Aranđelović, Mihajlo, Đorđević, Branislav, Sedmak, Simon, "Influence of mechanical properties of welded joint regions on pipeline structural integrity" in The 27th International Conference on Fracture and Structural Integrity (2023):182-183,
https://hdl.handle.net/21.15107/rcub_machinery_6026 .

TY  - CONF
AU  - Petrović, Ana
AU  - Momčilović, Nikola
AU  - Aranđelović, Mihajlo
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7287
AB  - Traditional approach in construction designing and structural integrity assessment implies
numerical calculations performed on the construction including construction elements that affect
rigidity and strength, without welded joints. That structure is evaluated in elastic response, and the
results are compared to yield strength, as shown in [1]. That approach is good enough for workloads
for most of the constructions. In that scenario, sudden overloading that led to structural collapse is
neglected. In those scenarios, within the plastic deformation domain, the differences in mechanical
properties of welded joint regions have vast influence to structural integrity. Mechanical properties
of welded joint regions are obtained using inverse methodology, that is mentioned in [2]. That
methodology included tensile testing of a specimen containing welded joint. During the experiment
strain field was continuously measured using stereo cameras, and results are processed using system
based on Digital Image Correlation. Numerical computational model of test specimen is formed using
the same parameters, as in the experiment (shape of welded joint, boundary conditions, loads, etc.).
To improve numerical model, deformations of all regions of welded joint (base material, weld metal,
and heat affected zone) are imported into numerical model. Consequently, material properties of all
three welded joint regions were obtained. Material properties are then used in analysis of welded joint
influence to structural integrity of several constructions, such as pipeline, pressure vessel, bucket
wheel excavator computational models. For all those constructions, two computational models are
made, the one without (classical approach) and the other containing welded joints. Results showed
that there is no difference between the two computational models during service operations (elastic
structural behaviour). However, within the plastic deformation domain, the differences between the
models are considerable. As extension of this research, plans are to perform experiments on real
constructions containing welded joints, applying the same inverse methodology. In that way,
considerable influence of mechanical properties of welded joint regions to structural integrity will be
confirmed. Also, dependence coefficient between tensile testing specimen and the real welded joint
regions on the real constructions can be formulated
C3  - ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering
T1  - Case-Study: Mechanical Properties of Welded Joint Regions Effects on Structural Integrity Assessment
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7287
ER  - 

@conference{
author = "Petrović, Ana and Momčilović, Nikola and Aranđelović, Mihajlo",
year = "2023",
abstract = "Traditional approach in construction designing and structural integrity assessment implies
numerical calculations performed on the construction including construction elements that affect
rigidity and strength, without welded joints. That structure is evaluated in elastic response, and the
results are compared to yield strength, as shown in [1]. That approach is good enough for workloads
for most of the constructions. In that scenario, sudden overloading that led to structural collapse is
neglected. In those scenarios, within the plastic deformation domain, the differences in mechanical
properties of welded joint regions have vast influence to structural integrity. Mechanical properties
of welded joint regions are obtained using inverse methodology, that is mentioned in [2]. That
methodology included tensile testing of a specimen containing welded joint. During the experiment
strain field was continuously measured using stereo cameras, and results are processed using system
based on Digital Image Correlation. Numerical computational model of test specimen is formed using
the same parameters, as in the experiment (shape of welded joint, boundary conditions, loads, etc.).
To improve numerical model, deformations of all regions of welded joint (base material, weld metal,
and heat affected zone) are imported into numerical model. Consequently, material properties of all
three welded joint regions were obtained. Material properties are then used in analysis of welded joint
influence to structural integrity of several constructions, such as pipeline, pressure vessel, bucket
wheel excavator computational models. For all those constructions, two computational models are
made, the one without (classical approach) and the other containing welded joints. Results showed
that there is no difference between the two computational models during service operations (elastic
structural behaviour). However, within the plastic deformation domain, the differences between the
models are considerable. As extension of this research, plans are to perform experiments on real
constructions containing welded joints, applying the same inverse methodology. In that way,
considerable influence of mechanical properties of welded joint regions to structural integrity will be
confirmed. Also, dependence coefficient between tensile testing specimen and the real welded joint
regions on the real constructions can be formulated",
journal = "ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering",
title = "Case-Study: Mechanical Properties of Welded Joint Regions Effects on Structural Integrity Assessment",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7287"
}

Petrović, A., Momčilović, N.,& Aranđelović, M.. (2023). Case-Study: Mechanical Properties of Welded Joint Regions Effects on Structural Integrity Assessment. in ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering, 87.
https://hdl.handle.net/21.15107/rcub_machinery_7287

Petrović A, Momčilović N, Aranđelović M. Case-Study: Mechanical Properties of Welded Joint Regions Effects on Structural Integrity Assessment. in ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering. 2023;:87.
https://hdl.handle.net/21.15107/rcub_machinery_7287 .

Petrović, Ana, Momčilović, Nikola, Aranđelović, Mihajlo, "Case-Study: Mechanical Properties of Welded Joint Regions Effects on Structural Integrity Assessment" in ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering (2023):87,
https://hdl.handle.net/21.15107/rcub_machinery_7287 .

TY  - CONF
AU  - Jeremić, Lazar
AU  - Đorđević, Branislav
AU  - Aranđelović, Mihajlo
AU  - Milovanović, Nikola
AU  - Sedmak, Simon
AU  - Jovanović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7096
AB  - The paper presents assess the integrity of welded joints on pressure vessels made from HSLA steel. Risk based approach is applied using Failure Analysis Diagram to assess likelihood of failure. Special attention is paid on cracks defects by advanced ultrasonic testing which are unacceptable by standards, but difficult to be repaired. Structural integrity assessment was performed based on evaluation of fracture mechanics parameters, which has been used to improve safety of welded structures, focusing on welded joints on pressure vessel, as the most critical components. Simple engineering method is presented, based on the Failure Analysis Diagram (FAD) to explain evaluation of fracture mechanics parameters and their critical values in order to assess structural integrity of welded joints.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts
T1  - STRUCTURAL INTEGRITY ASSESSMENT OF WELDS ON PRESSURE VESSELS
SP  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7096
ER  - 

@conference{
author = "Jeremić, Lazar and Đorđević, Branislav and Aranđelović, Mihajlo and Milovanović, Nikola and Sedmak, Simon and Jovanović, Aleksandar",
year = "2023",
abstract = "The paper presents assess the integrity of welded joints on pressure vessels made from HSLA steel. Risk based approach is applied using Failure Analysis Diagram to assess likelihood of failure. Special attention is paid on cracks defects by advanced ultrasonic testing which are unacceptable by standards, but difficult to be repaired. Structural integrity assessment was performed based on evaluation of fracture mechanics parameters, which has been used to improve safety of welded structures, focusing on welded joints on pressure vessel, as the most critical components. Simple engineering method is presented, based on the Failure Analysis Diagram (FAD) to explain evaluation of fracture mechanics parameters and their critical values in order to assess structural integrity of welded joints.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts",
title = "STRUCTURAL INTEGRITY ASSESSMENT OF WELDS ON PRESSURE VESSELS",
pages = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7096"
}

Jeremić, L., Đorđević, B., Aranđelović, M., Milovanović, N., Sedmak, S.,& Jovanović, A.. (2023). STRUCTURAL INTEGRITY ASSESSMENT OF WELDS ON PRESSURE VESSELS. in International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts
University of Belgrade - Faculty of Mechanical Engineering., 22.
https://hdl.handle.net/21.15107/rcub_machinery_7096

Jeremić L, Đorđević B, Aranđelović M, Milovanović N, Sedmak S, Jovanović A. STRUCTURAL INTEGRITY ASSESSMENT OF WELDS ON PRESSURE VESSELS. in International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts. 2023;:22.
https://hdl.handle.net/21.15107/rcub_machinery_7096 .

Jeremić, Lazar, Đorđević, Branislav, Aranđelović, Mihajlo, Milovanović, Nikola, Sedmak, Simon, Jovanović, Aleksandar, "STRUCTURAL INTEGRITY ASSESSMENT OF WELDS ON PRESSURE VESSELS" in International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts (2023):22,
https://hdl.handle.net/21.15107/rcub_machinery_7096 .

TY  - CONF
AU  - Đorđević, Branislav
AU  - Mastilović, Sreten
AU  - Sedmak, Aleksandar
AU  - Dimić, Aleksandar
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2023
UR  - https://www.sciencedirect.com/journal/procedia-structural-integrity/vol/47/suppl/C
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7100
AB  - The large scatter of the experimental fracture toughness data, characteristic of all ferritic steels in the ductile-to-brittle transition temperature region, imposed the need to include statistical methods for data processing. Due to the inherent stochasticity, the application of fracture mechanics concepts in the characterization of the DTB transition phenomenon has remained a challenging task over the past 50 years. Various models were developed based on statistical approach to data processing in order to capture the salient features of the phenomenon, but all of them have certain limitations because of the intrinsic complexity of the problem. However, all these models provided a solid basis for the continued development of new approaches in the characterization of DTB. Such two novel models are compared herein. They include size effects and utilize scaling of geometrically similar C(T) specimens, with the aim of obtaining predictions of the fracture toughness. Both proposed models have the weakest link statistics in common. In the present study, the EURO fracture toughness data set for 22NiMoCr37 reactor steel is used and the experimental data obtained at temperature of -60 °C is selected to demonstrate the accuracy of the estimates. The fracture toughness measure used is the critical value of the stress intensity factor used in the master curve KJc [MPa√m]. The obtained predictions are in good agreement with the experimental results, taking into account the inherent scatter of the experimental data. The estimate of KJc cumulative distribution function obtained by extrapolation using the novel two-step-scaling method is sensitive to the statistical size of the input data sets.
PB  - Elsevier B.V.
C3  - 27th International Conference on Fracture and Structural Integrity (IGF27)
T1  - Comparison of two recent approaches to DTB characterization of ferritic steels
EP  - 596
SP  - 589
VL  - 47
DO  - 10.1016/j.prostr.2023.07.065
ER  - 

@conference{
author = "Đorđević, Branislav and Mastilović, Sreten and Sedmak, Aleksandar and Dimić, Aleksandar and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2023",
abstract = "The large scatter of the experimental fracture toughness data, characteristic of all ferritic steels in the ductile-to-brittle transition temperature region, imposed the need to include statistical methods for data processing. Due to the inherent stochasticity, the application of fracture mechanics concepts in the characterization of the DTB transition phenomenon has remained a challenging task over the past 50 years. Various models were developed based on statistical approach to data processing in order to capture the salient features of the phenomenon, but all of them have certain limitations because of the intrinsic complexity of the problem. However, all these models provided a solid basis for the continued development of new approaches in the characterization of DTB. Such two novel models are compared herein. They include size effects and utilize scaling of geometrically similar C(T) specimens, with the aim of obtaining predictions of the fracture toughness. Both proposed models have the weakest link statistics in common. In the present study, the EURO fracture toughness data set for 22NiMoCr37 reactor steel is used and the experimental data obtained at temperature of -60 °C is selected to demonstrate the accuracy of the estimates. The fracture toughness measure used is the critical value of the stress intensity factor used in the master curve KJc [MPa√m]. The obtained predictions are in good agreement with the experimental results, taking into account the inherent scatter of the experimental data. The estimate of KJc cumulative distribution function obtained by extrapolation using the novel two-step-scaling method is sensitive to the statistical size of the input data sets.",
publisher = "Elsevier B.V.",
journal = "27th International Conference on Fracture and Structural Integrity (IGF27)",
title = "Comparison of two recent approaches to DTB characterization of ferritic steels",
pages = "596-589",
volume = "47",
doi = "10.1016/j.prostr.2023.07.065"
}

Đorđević, B., Mastilović, S., Sedmak, A., Dimić, A., Sedmak, S.,& Aranđelović, M.. (2023). Comparison of two recent approaches to DTB characterization of ferritic steels. in 27th International Conference on Fracture and Structural Integrity (IGF27)
Elsevier B.V.., 47, 589-596.
https://doi.org/10.1016/j.prostr.2023.07.065

Đorđević B, Mastilović S, Sedmak A, Dimić A, Sedmak S, Aranđelović M. Comparison of two recent approaches to DTB characterization of ferritic steels. in 27th International Conference on Fracture and Structural Integrity (IGF27). 2023;47:589-596.
doi:10.1016/j.prostr.2023.07.065 .

Đorđević, Branislav, Mastilović, Sreten, Sedmak, Aleksandar, Dimić, Aleksandar, Sedmak, Simon, Aranđelović, Mihajlo, "Comparison of two recent approaches to DTB characterization of ferritic steels" in 27th International Conference on Fracture and Structural Integrity (IGF27), 47 (2023):589-596,
https://doi.org/10.1016/j.prostr.2023.07.065 . .

TY  - JOUR
AU  - Đorđević, Branislav
AU  - Vučetić, Filip
AU  - Sedmak, Aleksandar
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7085
AB  - Using austenitic steel in welding structures requires both destructive and non-destructive testing (NDT) to approve the use of intended welding specification, but also testing of material properties, even if they are guaranteed by manufacturer. In this particular case, X2CrNiMo17-12-2 (commercial trademark AISI 316L) is the material that has to be partly replaced by NiCr21Mo (commercial trademark Incoloy 825) in a piece of process equipment exposed to elevated temperature and highly corrosive environment. This research presents an investigation of overmatching V groove welded joint made of these two austenitic materials. Due to materials properties and specific application conditions, low heat input TIG welding was utilized. Mechanical properties of welded joint have been examined to check criteria which guarantees safe work and integrity of welded components. Chemical composition of used filler material was close to the one of NiCr21Mo alloy, providing weld overmatching, which needs to be checked as well. Mechanical testing (tensile, bending, impact, hardness), macro- and microstructure analysis provided detailed insight into welded joint characteristics and a ground for further investigation concerning heterogeneous austenitic welded joint, taking into account overmatching effect.
PB  - Materials Science Forum
T2  - Materials Science Forum
T1  - Welding Joint Made of Two Different Austenitic Materials
EP  - 132
SP  - 125
VL  - 1095
DO  - 0.4028/p-4C1VlN
ER  - 

@article{
author = "Đorđević, Branislav and Vučetić, Filip and Sedmak, Aleksandar and Aranđelović, Mihajlo and Sedmak, Simon",
year = "2023",
abstract = "Using austenitic steel in welding structures requires both destructive and non-destructive testing (NDT) to approve the use of intended welding specification, but also testing of material properties, even if they are guaranteed by manufacturer. In this particular case, X2CrNiMo17-12-2 (commercial trademark AISI 316L) is the material that has to be partly replaced by NiCr21Mo (commercial trademark Incoloy 825) in a piece of process equipment exposed to elevated temperature and highly corrosive environment. This research presents an investigation of overmatching V groove welded joint made of these two austenitic materials. Due to materials properties and specific application conditions, low heat input TIG welding was utilized. Mechanical properties of welded joint have been examined to check criteria which guarantees safe work and integrity of welded components. Chemical composition of used filler material was close to the one of NiCr21Mo alloy, providing weld overmatching, which needs to be checked as well. Mechanical testing (tensile, bending, impact, hardness), macro- and microstructure analysis provided detailed insight into welded joint characteristics and a ground for further investigation concerning heterogeneous austenitic welded joint, taking into account overmatching effect.",
publisher = "Materials Science Forum",
journal = "Materials Science Forum",
title = "Welding Joint Made of Two Different Austenitic Materials",
pages = "132-125",
volume = "1095",
doi = "0.4028/p-4C1VlN"
}

Đorđević, B., Vučetić, F., Sedmak, A., Aranđelović, M.,& Sedmak, S.. (2023). Welding Joint Made of Two Different Austenitic Materials. in Materials Science Forum
Materials Science Forum., 1095, 125-132.
https://doi.org/0.4028/p-4C1VlN

Đorđević B, Vučetić F, Sedmak A, Aranđelović M, Sedmak S. Welding Joint Made of Two Different Austenitic Materials. in Materials Science Forum. 2023;1095:125-132.
doi:0.4028/p-4C1VlN .

Đorđević, Branislav, Vučetić, Filip, Sedmak, Aleksandar, Aranđelović, Mihajlo, Sedmak, Simon, "Welding Joint Made of Two Different Austenitic Materials" in Materials Science Forum, 1095 (2023):125-132,
https://doi.org/0.4028/p-4C1VlN . .

TY  - JOUR
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Đorđević, Branislav
AU  - Jovičić, Radomir
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7084
AB  - This paper presents the development of numerical models which were used to simulate
the behaviour of welded joints containing different combinations of multiple defects under tensile
loads. Four representative combinations of defects were selected (including undercuts, incomplete
root penetration, misalignments…), based on practical experience. In order to create accurate and
functional models, this research involve a number of stages. This paper will focus on the various
improvements made to the models, which started in relatively simple form. For this purpose, initial
experimental and numerical analyses were carried out on specimens made of low-alloyed lowcarbon steel S235, and after their accuracy was verified, the same methodology was applied to
specimens made of higher quality material, steel S275. Improvements made to the models involved
geometry, different combinations of boundary conditions and loads, and some were based on stressstrain states obtained by a combination of tensile testing and digital image correlation. The final
result was a set of detailed numerical models which accurately simulated the behaviour of welded
joints with multiple defects in them.
PB  - Trans Tech Publications
T2  - Materials Science Forum
T1  - Development and Improvement of Numerical Models of Welded Joints with Multiple Defects
EP  - 161
SP  - 153
VL  - 1095
DO  - 10.4028/p-mQTw2J
ER  - 

@article{
author = "Aranđelović, Mihajlo and Sedmak, Simon and Sedmak, Aleksandar and Đorđević, Branislav and Jovičić, Radomir",
year = "2023",
abstract = "This paper presents the development of numerical models which were used to simulate
the behaviour of welded joints containing different combinations of multiple defects under tensile
loads. Four representative combinations of defects were selected (including undercuts, incomplete
root penetration, misalignments…), based on practical experience. In order to create accurate and
functional models, this research involve a number of stages. This paper will focus on the various
improvements made to the models, which started in relatively simple form. For this purpose, initial
experimental and numerical analyses were carried out on specimens made of low-alloyed lowcarbon steel S235, and after their accuracy was verified, the same methodology was applied to
specimens made of higher quality material, steel S275. Improvements made to the models involved
geometry, different combinations of boundary conditions and loads, and some were based on stressstrain states obtained by a combination of tensile testing and digital image correlation. The final
result was a set of detailed numerical models which accurately simulated the behaviour of welded
joints with multiple defects in them.",
publisher = "Trans Tech Publications",
journal = "Materials Science Forum",
title = "Development and Improvement of Numerical Models of Welded Joints with Multiple Defects",
pages = "161-153",
volume = "1095",
doi = "10.4028/p-mQTw2J"
}

Aranđelović, M., Sedmak, S., Sedmak, A., Đorđević, B.,& Jovičić, R.. (2023). Development and Improvement of Numerical Models of Welded Joints with Multiple Defects. in Materials Science Forum
Trans Tech Publications., 1095, 153-161.
https://doi.org/10.4028/p-mQTw2J

Aranđelović M, Sedmak S, Sedmak A, Đorđević B, Jovičić R. Development and Improvement of Numerical Models of Welded Joints with Multiple Defects. in Materials Science Forum. 2023;1095:153-161.
doi:10.4028/p-mQTw2J .

Aranđelović, Mihajlo, Sedmak, Simon, Sedmak, Aleksandar, Đorđević, Branislav, Jovičić, Radomir, "Development and Improvement of Numerical Models of Welded Joints with Multiple Defects" in Materials Science Forum, 1095 (2023):153-161,
https://doi.org/10.4028/p-mQTw2J . .

TY  - JOUR
AU  - Radu, Dorin
AU  - Bancila, Radu
AU  - Boldus, Dorel
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7115
AB  - Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modern functional role that fits functionally into the landscape.
The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values
are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack.
to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent
iterative solver – applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of
cycles for a number of blocks (one block representing all the applied cycles of stress ranges).
T2  - Procedia Structural Integrity
T1  - Solution for consolidation and retrofitting a historical steel bridge
EP  - 778
SP  - 771
VL  - 37
DO  - 10.1016/j.prostr.2022.02.008
ER  - 

@article{
author = "Radu, Dorin and Bancila, Radu and Boldus, Dorel and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modern functional role that fits functionally into the landscape.
The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values
are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack.
to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent
iterative solver – applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of
cycles for a number of blocks (one block representing all the applied cycles of stress ranges).",
journal = "Procedia Structural Integrity",
title = "Solution for consolidation and retrofitting a historical steel bridge",
pages = "778-771",
volume = "37",
doi = "10.1016/j.prostr.2022.02.008"
}

Radu, D., Bancila, R., Boldus, D., Sedmak, S.,& Aranđelović, M.. (2022). Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity, 37, 771-778.
https://doi.org/10.1016/j.prostr.2022.02.008

Radu D, Bancila R, Boldus D, Sedmak S, Aranđelović M. Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity. 2022;37:771-778.
doi:10.1016/j.prostr.2022.02.008 .

Radu, Dorin, Bancila, Radu, Boldus, Dorel, Sedmak, Simon, Aranđelović, Mihajlo, "Solution for consolidation and retrofitting a historical steel bridge" in Procedia Structural Integrity, 37 (2022):771-778,
https://doi.org/10.1016/j.prostr.2022.02.008 . .

TY  - JOUR
AU  - Burzić, Zijah
AU  - Sedmak, Aleksandar
AU  - Sedmak, Simon
AU  - Perković, Srđa
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7114
AB  - Results of extensive experiments involving the fatigue behaviour of welded structures which are a part of the “Gazela” bridge in Belgrade, Serbia, are presented in this paper. After non-destructive testing of these structures, crack-like defects were detected, and welded plates containing them were taken out for the purpose of destructive testing. This testing involved tensile tests, impact
testing using an instrumented Charpy pendulum and fatigue tests, from which the S-N curves were obtained. Based on these results, fracture mechanics parameters were determined, including crack tip opening, critical J-integral, stress intensity factors and critical crack length. In addition, fatigue tests, which involved four-point bending of standard Charpy specimens provided da/dN-ΔK
curves, which were then used in order to determine Paris Law coefficient, C and m. Obtained results are of great importance in order to better understand the behaviour of large-scale welded structures subjected to both static and dynamic (cyclic) loads, such as bridges
T2  - Procedia Structural Integrity
T1  - Analysis of fatigue behaviour of a bridge welded structure
EP  - 778
SP  - 771
VL  - 37
DO  - 10.1016/j.prostr.2022.02.008
ER  - 

@article{
author = "Burzić, Zijah and Sedmak, Aleksandar and Sedmak, Simon and Perković, Srđa and Aranđelović, Mihajlo",
year = "2022",
abstract = "Results of extensive experiments involving the fatigue behaviour of welded structures which are a part of the “Gazela” bridge in Belgrade, Serbia, are presented in this paper. After non-destructive testing of these structures, crack-like defects were detected, and welded plates containing them were taken out for the purpose of destructive testing. This testing involved tensile tests, impact
testing using an instrumented Charpy pendulum and fatigue tests, from which the S-N curves were obtained. Based on these results, fracture mechanics parameters were determined, including crack tip opening, critical J-integral, stress intensity factors and critical crack length. In addition, fatigue tests, which involved four-point bending of standard Charpy specimens provided da/dN-ΔK
curves, which were then used in order to determine Paris Law coefficient, C and m. Obtained results are of great importance in order to better understand the behaviour of large-scale welded structures subjected to both static and dynamic (cyclic) loads, such as bridges",
journal = "Procedia Structural Integrity",
title = "Analysis of fatigue behaviour of a bridge welded structure",
pages = "778-771",
volume = "37",
doi = "10.1016/j.prostr.2022.02.008"
}

Burzić, Z., Sedmak, A., Sedmak, S., Perković, S.,& Aranđelović, M.. (2022). Analysis of fatigue behaviour of a bridge welded structure. in Procedia Structural Integrity, 37, 771-778.
https://doi.org/10.1016/j.prostr.2022.02.008

Burzić Z, Sedmak A, Sedmak S, Perković S, Aranđelović M. Analysis of fatigue behaviour of a bridge welded structure. in Procedia Structural Integrity. 2022;37:771-778.
doi:10.1016/j.prostr.2022.02.008 .

Burzić, Zijah, Sedmak, Aleksandar, Sedmak, Simon, Perković, Srđa, Aranđelović, Mihajlo, "Analysis of fatigue behaviour of a bridge welded structure" in Procedia Structural Integrity, 37 (2022):771-778,
https://doi.org/10.1016/j.prostr.2022.02.008 . .

TY  - CONF
AU  - Aranđelović, Mihajlo
AU  - Jovičić, Radomir
AU  - Đorđević, Branislav
AU  - Milovanović, Nikola
AU  - Sedmak, Simon
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6272
AB  - The idea behind the idea of developing this method was to introduce reference points at important locations, such as the fusion line and heat-affected zones, the displacement of which would be monitored during the uniaxial testing, and then measured at key moments. The uniaxial tensile test process was recorded with a high-resolution camera so that changes could be observed during the test. The reason why this approach was chosen was that the crucial zones could be adequately marked and thus allow the allocation of the appropriate frame in order to monitor the strain of each welded joint zone individually.
C3  - 32 n d Conference with international participation WELDING 2022
T1  - Development of an Analogical Model for Strain Monitoring of Welded Joint Regions During Uniaxial Tensile Testing
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6272
ER  - 

@conference{
author = "Aranđelović, Mihajlo and Jovičić, Radomir and Đorđević, Branislav and Milovanović, Nikola and Sedmak, Simon",
year = "2022",
abstract = "The idea behind the idea of developing this method was to introduce reference points at important locations, such as the fusion line and heat-affected zones, the displacement of which would be monitored during the uniaxial testing, and then measured at key moments. The uniaxial tensile test process was recorded with a high-resolution camera so that changes could be observed during the test. The reason why this approach was chosen was that the crucial zones could be adequately marked and thus allow the allocation of the appropriate frame in order to monitor the strain of each welded joint zone individually.",
journal = "32 n d Conference with international participation WELDING 2022",
title = "Development of an Analogical Model for Strain Monitoring of Welded Joint Regions During Uniaxial Tensile Testing",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6272"
}

Aranđelović, M., Jovičić, R., Đorđević, B., Milovanović, N.,& Sedmak, S.. (2022). Development of an Analogical Model for Strain Monitoring of Welded Joint Regions During Uniaxial Tensile Testing. in 32 n d Conference with international participation WELDING 2022.
https://hdl.handle.net/21.15107/rcub_machinery_6272

Aranđelović M, Jovičić R, Đorđević B, Milovanović N, Sedmak S. Development of an Analogical Model for Strain Monitoring of Welded Joint Regions During Uniaxial Tensile Testing. in 32 n d Conference with international participation WELDING 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6272 .

Aranđelović, Mihajlo, Jovičić, Radomir, Đorđević, Branislav, Milovanović, Nikola, Sedmak, Simon, "Development of an Analogical Model for Strain Monitoring of Welded Joint Regions During Uniaxial Tensile Testing" in 32 n d Conference with international participation WELDING 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6272 .

TY  - JOUR
AU  - Tanasković, Drakče
AU  - Aranđelović, Mihajlo
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6258
AB  - This paper covers the literature review of the work by author, who have been involved in
the subject of machine element repairing from the techno-economical point of view. Positive
aspects of repairing, as opposed to purchasing new parts are shown and discussed. All of the
examples given as part of the literature review are related to real, practical problems. It was
concluded in all cases, that the repairing of damaged parts was the better option, since not only did it cost significantly less, it also noticeably decreased the equipment downtime, as there was no need to wait for the new part to be delivered.
T2  - Advanced Materials Research
T1  - Review: Advantages of Repairing Machine Parts in Order to Restore their Functionality
EP  - 50
SP  - 45
VL  - 1172
DO  - https://doi.org/10.4028/p-394qc2
ER  - 

@article{
author = "Tanasković, Drakče and Aranđelović, Mihajlo and Đorđević, Branislav and Sedmak, Simon",
year = "2022",
abstract = "This paper covers the literature review of the work by author, who have been involved in
the subject of machine element repairing from the techno-economical point of view. Positive
aspects of repairing, as opposed to purchasing new parts are shown and discussed. All of the
examples given as part of the literature review are related to real, practical problems. It was
concluded in all cases, that the repairing of damaged parts was the better option, since not only did it cost significantly less, it also noticeably decreased the equipment downtime, as there was no need to wait for the new part to be delivered.",
journal = "Advanced Materials Research",
title = "Review: Advantages of Repairing Machine Parts in Order to Restore their Functionality",
pages = "50-45",
volume = "1172",
doi = "https://doi.org/10.4028/p-394qc2"
}

Tanasković, D., Aranđelović, M., Đorđević, B.,& Sedmak, S.. (2022). Review: Advantages of Repairing Machine Parts in Order to Restore their Functionality. in Advanced Materials Research, 1172, 45-50.
https://doi.org/https://doi.org/10.4028/p-394qc2

Tanasković D, Aranđelović M, Đorđević B, Sedmak S. Review: Advantages of Repairing Machine Parts in Order to Restore their Functionality. in Advanced Materials Research. 2022;1172:45-50.
doi:https://doi.org/10.4028/p-394qc2 .

Tanasković, Drakče, Aranđelović, Mihajlo, Đorđević, Branislav, Sedmak, Simon, "Review: Advantages of Repairing Machine Parts in Order to Restore their Functionality" in Advanced Materials Research, 1172 (2022):45-50,
https://doi.org/https://doi.org/10.4028/p-394qc2 . .

TY  - CONF
AU  - Milivojević, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5974
AB  - Welding is analyzed here as an intelligent process in the context of Industry 4.0, with a focus
on two aspects: automatization and machine learning. In the case of automatization, starting from the first industrial robots as applied in spot welding in car industry 50 years ago, advances in other welding processes like Gas Shielded Arc Welding (GSAW) and Laser Beam Welding (LBW) are presented. As for the machine learning, starting from the early efforts to use neural networks to correlate input welding parameters with a shape of a welded joint in early nineties, advances in modern machine learning technologies to predict mechanical properties and microstructure are presented.
PB  - UNIVERSITY OF BELGRADE Faculty of Mechanical Engineering
C3  - 10th International Scientific Conference -IRMES 2022 Research and Development of Mechanical Elements and Systems, Proceedings
T1  - INTELLIGENT WELDING IN CONTEXT OF INDUSTRY 4.0
EP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5974
ER  - 

@conference{
author = "Milivojević, Aleksandar and Sedmak, Aleksandar and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Welding is analyzed here as an intelligent process in the context of Industry 4.0, with a focus
on two aspects: automatization and machine learning. In the case of automatization, starting from the first industrial robots as applied in spot welding in car industry 50 years ago, advances in other welding processes like Gas Shielded Arc Welding (GSAW) and Laser Beam Welding (LBW) are presented. As for the machine learning, starting from the early efforts to use neural networks to correlate input welding parameters with a shape of a welded joint in early nineties, advances in modern machine learning technologies to predict mechanical properties and microstructure are presented.",
publisher = "UNIVERSITY OF BELGRADE Faculty of Mechanical Engineering",
journal = "10th International Scientific Conference -IRMES 2022 Research and Development of Mechanical Elements and Systems, Proceedings",
title = "INTELLIGENT WELDING IN CONTEXT OF INDUSTRY 4.0",
pages = "101",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5974"
}

Milivojević, A., Sedmak, A., Sedmak, S.,& Aranđelović, M.. (2022). INTELLIGENT WELDING IN CONTEXT OF INDUSTRY 4.0. in 10th International Scientific Conference -IRMES 2022 Research and Development of Mechanical Elements and Systems, Proceedings
UNIVERSITY OF BELGRADE Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5974

Milivojević A, Sedmak A, Sedmak S, Aranđelović M. INTELLIGENT WELDING IN CONTEXT OF INDUSTRY 4.0. in 10th International Scientific Conference -IRMES 2022 Research and Development of Mechanical Elements and Systems, Proceedings. 2022;:null-101.
https://hdl.handle.net/21.15107/rcub_machinery_5974 .

Milivojević, Aleksandar, Sedmak, Aleksandar, Sedmak, Simon, Aranđelović, Mihajlo, "INTELLIGENT WELDING IN CONTEXT OF INDUSTRY 4.0" in 10th International Scientific Conference -IRMES 2022 Research and Development of Mechanical Elements and Systems, Proceedings (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5974 .

TY  - CONF
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Jovičić, Radomir
AU  - Sedmak, Aleksandar
AU  - Petrović, Ana
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6019
C3  - ECF23, European Conference on Fracture 2022, Book of abstracts
T1  - Structural integrity of welded joints with different defect combinations–previous studies
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6019
ER  - 

@conference{
author = "Aranđelović, Mihajlo and Sedmak, Simon and Jovičić, Radomir and Sedmak, Aleksandar and Petrović, Ana",
year = "2022",
journal = "ECF23, European Conference on Fracture 2022, Book of abstracts",
title = "Structural integrity of welded joints with different defect combinations–previous studies",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6019"
}

Aranđelović, M., Sedmak, S., Jovičić, R., Sedmak, A.,& Petrović, A.. (2022). Structural integrity of welded joints with different defect combinations–previous studies. in ECF23, European Conference on Fracture 2022, Book of abstracts.
https://hdl.handle.net/21.15107/rcub_machinery_6019

Aranđelović M, Sedmak S, Jovičić R, Sedmak A, Petrović A. Structural integrity of welded joints with different defect combinations–previous studies. in ECF23, European Conference on Fracture 2022, Book of abstracts. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6019 .

Aranđelović, Mihajlo, Sedmak, Simon, Jovičić, Radomir, Sedmak, Aleksandar, Petrović, Ana, "Structural integrity of welded joints with different defect combinations–previous studies" in ECF23, European Conference on Fracture 2022, Book of abstracts (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6019 .

TY  - CONF
AU  - Aranđelović, Mihajlo
AU  - Sedmak, Simon
AU  - Jovičić, Radomir
AU  - Petrović, Ana
AU  - Dikić, Stefan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6017
C3  - ECF23, European Conference on Fracture 2022, Procedia Structural Integrity
T1  - Optimisation of numerical models of welded joints with multiple defect combinations
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6017
ER  - 

@conference{
author = "Aranđelović, Mihajlo and Sedmak, Simon and Jovičić, Radomir and Petrović, Ana and Dikić, Stefan",
year = "2022",
journal = "ECF23, European Conference on Fracture 2022, Procedia Structural Integrity",
title = "Optimisation of numerical models of welded joints with multiple defect combinations",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6017"
}

Aranđelović, M., Sedmak, S., Jovičić, R., Petrović, A.,& Dikić, S.. (2022). Optimisation of numerical models of welded joints with multiple defect combinations. in ECF23, European Conference on Fracture 2022, Procedia Structural Integrity.
https://hdl.handle.net/21.15107/rcub_machinery_6017

Aranđelović M, Sedmak S, Jovičić R, Petrović A, Dikić S. Optimisation of numerical models of welded joints with multiple defect combinations. in ECF23, European Conference on Fracture 2022, Procedia Structural Integrity. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6017 .

Aranđelović, Mihajlo, Sedmak, Simon, Jovičić, Radomir, Petrović, Ana, Dikić, Stefan, "Optimisation of numerical models of welded joints with multiple defect combinations" in ECF23, European Conference on Fracture 2022, Procedia Structural Integrity (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6017 .

TY  - JOUR
AU  - Tanasković, Drakče
AU  - Đorđević, Branislav
AU  - Aranđelović, Mihajlo
AU  - Milošević, Nenad
AU  - Vučetić, Filip
AU  - Sedmak, Simon
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4275
AB  - During preparing activities, as well as welding proces itself, it is necessary to strictly adhere to all relavant standards, programs and prescribed procedures. Experience can have a significant role for realization of repair welding, but it can also have the opposite effect. This fact (or ignorance) has led to the need for subsequent repair of cracks on the treiber roll. The previous claim is based on the fact that the treiber roll is made of S235J0 steel, whose characteristics (such as weldability) are not unknown, and inadequately measures that where taken led to the cold cracks occurance, which directly and indirectly caused huge losses. The reasons for cold cracks occurance were also explained in the paper itself. Steps for cold cracks repairing on the upper treiber roll of steel-mill sheet metal plant are also presented. Steps for repair welding with all parameters are described in order to eliminate defects caused by previous welding technology.
T2  - Welding and Material Testing
T1  - Successful repair of cold cracks on treiber roll: case study
IS  - 2
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4275
ER  - 

@article{
author = "Tanasković, Drakče and Đorđević, Branislav and Aranđelović, Mihajlo and Milošević, Nenad and Vučetić, Filip and Sedmak, Simon",
year = "2022",
abstract = "During preparing activities, as well as welding proces itself, it is necessary to strictly adhere to all relavant standards, programs and prescribed procedures. Experience can have a significant role for realization of repair welding, but it can also have the opposite effect. This fact (or ignorance) has led to the need for subsequent repair of cracks on the treiber roll. The previous claim is based on the fact that the treiber roll is made of S235J0 steel, whose characteristics (such as weldability) are not unknown, and inadequately measures that where taken led to the cold cracks occurance, which directly and indirectly caused huge losses. The reasons for cold cracks occurance were also explained in the paper itself. Steps for cold cracks repairing on the upper treiber roll of steel-mill sheet metal plant are also presented. Steps for repair welding with all parameters are described in order to eliminate defects caused by previous welding technology.",
journal = "Welding and Material Testing",
title = "Successful repair of cold cracks on treiber roll: case study",
number = "2",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4275"
}

Tanasković, D., Đorđević, B., Aranđelović, M., Milošević, N., Vučetić, F.,& Sedmak, S.. (2022). Successful repair of cold cracks on treiber roll: case study. in Welding and Material Testing(2).
https://hdl.handle.net/21.15107/rcub_machinery_4275

Tanasković D, Đorđević B, Aranđelović M, Milošević N, Vučetić F, Sedmak S. Successful repair of cold cracks on treiber roll: case study. in Welding and Material Testing. 2022;(2).
https://hdl.handle.net/21.15107/rcub_machinery_4275 .

Tanasković, Drakče, Đorđević, Branislav, Aranđelović, Mihajlo, Milošević, Nenad, Vučetić, Filip, Sedmak, Simon, "Successful repair of cold cracks on treiber roll: case study" in Welding and Material Testing, no. 2 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_4275 .

TY  - CONF
AU  - Radu, Dorin
AU  - Bancila, Radu
AU  - Boldus, Dorel
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3738
AB  - Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modem functional role that fits functionally into the landscape. The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent iterative solver - applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of cycles for a number of blocks (one block representing all the applied cycles of stress ranges).
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)
T1  - Solution for consolidation and retrofitting a historical steel bridge
EP  - 778
SP  - 771
VL  - 37
DO  - 10.1016/j.prostr.2022.02.008
ER  - 

@conference{
author = "Radu, Dorin and Bancila, Radu and Boldus, Dorel and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Sustainable development is a fundamental goal of the European Union and seeks to meet the needs of the present, without compromising the future. The rehabilitation of historic steel constructions and old steel bridges in service, is part of the maintenance and conservation of existing heritage, thus considering a sustainable development concept, while constituting an act of culture. In present time, in Romania there are a relatively small number of steel bridges older than 100 years, especially in Transylvania region; they can be considered "witnesses of the past". Two important aspects are highlighted: consolidation costs are lower than for a new structure and the retrofitted bridge can receive a new, modem functional role that fits functionally into the landscape. The paper is presenting a study case for an existing steel bridge build in the beginning of twentieth century (around year 1925). There are presented solution for consolidation of the bridge and retrofitting, taken into account fatigue design and structural integrity assessment. Critical flaws values were determined for each case type using the failure assessment diagrams. These values are used as limit values for fatigue analysis based on fracture mechanics principles, to determine the number of cycles for a crack to extend from initial to critical dimension, i.e. failure. For the assessment was used the code cyclic loading as a block independent iterative solver - applying the specified stress ranges sequentially line by line, repeating the entire cyclic loading - entire group of cycles for a number of blocks (one block representing all the applied cycles of stress ranges).",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)",
title = "Solution for consolidation and retrofitting a historical steel bridge",
pages = "778-771",
volume = "37",
doi = "10.1016/j.prostr.2022.02.008"
}

Radu, D., Bancila, R., Boldus, D., Sedmak, S.,& Aranđelović, M.. (2022). Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)
Elsevier Science Bv, Amsterdam., 37, 771-778.
https://doi.org/10.1016/j.prostr.2022.02.008

Radu D, Bancila R, Boldus D, Sedmak S, Aranđelović M. Solution for consolidation and retrofitting a historical steel bridge. in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021). 2022;37:771-778.
doi:10.1016/j.prostr.2022.02.008 .

Radu, Dorin, Bancila, Radu, Boldus, Dorel, Sedmak, Simon, Aranđelović, Mihajlo, "Solution for consolidation and retrofitting a historical steel bridge" in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021), 37 (2022):771-778,
https://doi.org/10.1016/j.prostr.2022.02.008 . .

TY  - CONF
AU  - Aranđelović, Mihajlo
AU  - Petrović, Ana
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Dikić, Stefan
AU  - Jovičić, Radomir
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6029
C3  - CIBv 2022 International Scientific Conference on Civil Engineering and Building Services
T1  - Effects of Multiple Defects on Welded Joint Behaviour Under the Uniaxial Tensile Loadring: Numerical and Experimental Approach
SP  - 98
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6029
ER  - 

@conference{
author = "Aranđelović, Mihajlo and Petrović, Ana and Đorđević, Branislav and Sedmak, Simon and Sedmak, Aleksandar and Dikić, Stefan and Jovičić, Radomir",
year = "2022",
journal = "CIBv 2022 International Scientific Conference on Civil Engineering and Building Services",
title = "Effects of Multiple Defects on Welded Joint Behaviour Under the Uniaxial Tensile Loadring: Numerical and Experimental Approach",
pages = "98",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6029"
}

Aranđelović, M., Petrović, A., Đorđević, B., Sedmak, S., Sedmak, A., Dikić, S.,& Jovičić, R.. (2022). Effects of Multiple Defects on Welded Joint Behaviour Under the Uniaxial Tensile Loadring: Numerical and Experimental Approach. in CIBv 2022 International Scientific Conference on Civil Engineering and Building Services, 98.
https://hdl.handle.net/21.15107/rcub_machinery_6029

Aranđelović M, Petrović A, Đorđević B, Sedmak S, Sedmak A, Dikić S, Jovičić R. Effects of Multiple Defects on Welded Joint Behaviour Under the Uniaxial Tensile Loadring: Numerical and Experimental Approach. in CIBv 2022 International Scientific Conference on Civil Engineering and Building Services. 2022;:98.
https://hdl.handle.net/21.15107/rcub_machinery_6029 .

Aranđelović, Mihajlo, Petrović, Ana, Đorđević, Branislav, Sedmak, Simon, Sedmak, Aleksandar, Dikić, Stefan, Jovičić, Radomir, "Effects of Multiple Defects on Welded Joint Behaviour Under the Uniaxial Tensile Loadring: Numerical and Experimental Approach" in CIBv 2022 International Scientific Conference on Civil Engineering and Building Services (2022):98,
https://hdl.handle.net/21.15107/rcub_machinery_6029 .

TY  - CONF
AU  - Burzić, Zijah
AU  - Sedmak, Aleksandar
AU  - Sedmak, Simon
AU  - Perković, Srđa
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3779
AB  - Results of extensive experiments involving the fatigue behaviour of welded structures which are a part of the "Gazela" bridge in Belgrade, Serbia, are presented in this paper. After non-destructive testing of these structures, crack-like defects were detected, and welded plates containing them were taken out for the purpose of destructive testing. This testing involved tensile tests, impact testing using an instrumented Charpy pendulum and fatigue tests, from which the S-N curves were obtained. Based on these results, fracture mechanics parameters were determined, including crack tip opening, critical J-integral, stress intensity factors and critical crack length. In addition, fatigue tests, which involved four-point bending of standard Charpy specimens provided da/dN-Delta K curves, which were then used in order to determine Paris Law coefficient, C and m. Obtained results are of great importance in order to better understand the behaviour of large-scale welded structures subjected to both static and dynamic (cyclic) loads, such as bridges.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)
T1  - Analysis of fatigue behaviour of a bridge welded structure
EP  - 273
SP  - 269
VL  - 37
DO  - 10.1016/j.prostr.2022.01.084
ER  - 

@conference{
author = "Burzić, Zijah and Sedmak, Aleksandar and Sedmak, Simon and Perković, Srđa and Aranđelović, Mihajlo",
year = "2022",
abstract = "Results of extensive experiments involving the fatigue behaviour of welded structures which are a part of the "Gazela" bridge in Belgrade, Serbia, are presented in this paper. After non-destructive testing of these structures, crack-like defects were detected, and welded plates containing them were taken out for the purpose of destructive testing. This testing involved tensile tests, impact testing using an instrumented Charpy pendulum and fatigue tests, from which the S-N curves were obtained. Based on these results, fracture mechanics parameters were determined, including crack tip opening, critical J-integral, stress intensity factors and critical crack length. In addition, fatigue tests, which involved four-point bending of standard Charpy specimens provided da/dN-Delta K curves, which were then used in order to determine Paris Law coefficient, C and m. Obtained results are of great importance in order to better understand the behaviour of large-scale welded structures subjected to both static and dynamic (cyclic) loads, such as bridges.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)",
title = "Analysis of fatigue behaviour of a bridge welded structure",
pages = "273-269",
volume = "37",
doi = "10.1016/j.prostr.2022.01.084"
}

Burzić, Z., Sedmak, A., Sedmak, S., Perković, S.,& Aranđelović, M.. (2022). Analysis of fatigue behaviour of a bridge welded structure. in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021)
Elsevier Science Bv, Amsterdam., 37, 269-273.
https://doi.org/10.1016/j.prostr.2022.01.084

Burzić Z, Sedmak A, Sedmak S, Perković S, Aranđelović M. Analysis of fatigue behaviour of a bridge welded structure. in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021). 2022;37:269-273.
doi:10.1016/j.prostr.2022.01.084 .

Burzić, Zijah, Sedmak, Aleksandar, Sedmak, Simon, Perković, Srđa, Aranđelović, Mihajlo, "Analysis of fatigue behaviour of a bridge welded structure" in Procedia Structural Integrity - 4th International Conference on Structural Integrity (Icsi 2021), 37 (2022):269-273,
https://doi.org/10.1016/j.prostr.2022.01.084 . .

TY  - CONF
AU  - Radu, Dorin
AU  - Bancila, Radu
AU  - Sedmak, Simon
AU  - Aranđelović, Mihajlo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6505
AB  - Sustainability has become an increasingly important component of requirements for the rehabilitation of bridge structures.
Responsible use of our limited natural resources is essential for future generations, so the whole bridge rehabilitation process must
be taken into account, in terms of structural integrity. The environmental impact for these types of structures is major – demolition
and reconsideration of e.g. reinforced concrete structure being examples of poor management of resources and energy. On the
existing roads and railways network steel bridges with more than 100 years in service lifetime are numerous. The in-service safety
assessment of these structures is a complex problem. This article emphasizes the importance of rehabilitating the structure of
existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures,
part of sustainable development. The paper is presenting a study case for an historical riveted steel bridge build in the beginning of
twentieth century, with an assessment method considering the structural integrity by means of fracture mechanics
PB  - Elsevier
C3  - Procedia Structural Integrity
T1  - Residual life of a historic riveted steel bridge - engineering critical assessment approach
EP  - 1112
SP  - 1106
VL  - 42
DO  - 10.1016/j.prostr.2022.12.141
ER  - 

@conference{
author = "Radu, Dorin and Bancila, Radu and Sedmak, Simon and Aranđelović, Mihajlo",
year = "2022",
abstract = "Sustainability has become an increasingly important component of requirements for the rehabilitation of bridge structures.
Responsible use of our limited natural resources is essential for future generations, so the whole bridge rehabilitation process must
be taken into account, in terms of structural integrity. The environmental impact for these types of structures is major – demolition
and reconsideration of e.g. reinforced concrete structure being examples of poor management of resources and energy. On the
existing roads and railways network steel bridges with more than 100 years in service lifetime are numerous. The in-service safety
assessment of these structures is a complex problem. This article emphasizes the importance of rehabilitating the structure of
existing steel bridges, considering the historical monument character of these structures, as well as the reuse of existing structures,
part of sustainable development. The paper is presenting a study case for an historical riveted steel bridge build in the beginning of
twentieth century, with an assessment method considering the structural integrity by means of fracture mechanics",
publisher = "Elsevier",
journal = "Procedia Structural Integrity",
title = "Residual life of a historic riveted steel bridge - engineering critical assessment approach",
pages = "1112-1106",
volume = "42",
doi = "10.1016/j.prostr.2022.12.141"
}

Radu, D., Bancila, R., Sedmak, S.,& Aranđelović, M.. (2022). Residual life of a historic riveted steel bridge - engineering critical assessment approach. in Procedia Structural Integrity
Elsevier., 42, 1106-1112.
https://doi.org/10.1016/j.prostr.2022.12.141

Radu D, Bancila R, Sedmak S, Aranđelović M. Residual life of a historic riveted steel bridge - engineering critical assessment approach. in Procedia Structural Integrity. 2022;42:1106-1112.
doi:10.1016/j.prostr.2022.12.141 .

Radu, Dorin, Bancila, Radu, Sedmak, Simon, Aranđelović, Mihajlo, "Residual life of a historic riveted steel bridge - engineering critical assessment approach" in Procedia Structural Integrity, 42 (2022):1106-1112,
https://doi.org/10.1016/j.prostr.2022.12.141 . .