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  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Grbović, Aleksandar
AU  - Sedmak, Simon
AU  - Milošević, Nenad
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7778
AB  - Experimental and numerical analysis of crack growth in integral skin-stringer panels, produced by Laser Beam Welding (LBW), was performed in the scope of WELDAIR project and later on. Experiment was performed on full-scale components (four stringers, three welded clips), made of AA 6156 T6. Digital Image Correlation (DIC) was used to measure strains and construct CTOD or J crack resistance curves. It was shown that J vs. Δa can have unusual shape, indicating real component crack resistance instead of critical J value commonly obtained by comparing J-R curves with calculated Crack Driving Forces (CDFs). The applied technique is simple, practical and has no limitation in respect to material and geometry
PB  - Elsevier
T2  - Procedia Structural Integrity
T1  - Crack Resistance of AA6156 Welded Stringer Panels
EP  - 380
SP  - 376
VL  - 54
DO  - 10.1016/j.prostr.2024.01.096
ER  - 

@article{
author = "Sedmak, Aleksandar and Petrovski, Blagoj and Grbović, Aleksandar and Sedmak, Simon and Milošević, Nenad",
year = "2024",
abstract = "Experimental and numerical analysis of crack growth in integral skin-stringer panels, produced by Laser Beam Welding (LBW), was performed in the scope of WELDAIR project and later on. Experiment was performed on full-scale components (four stringers, three welded clips), made of AA 6156 T6. Digital Image Correlation (DIC) was used to measure strains and construct CTOD or J crack resistance curves. It was shown that J vs. Δa can have unusual shape, indicating real component crack resistance instead of critical J value commonly obtained by comparing J-R curves with calculated Crack Driving Forces (CDFs). The applied technique is simple, practical and has no limitation in respect to material and geometry",
publisher = "Elsevier",
journal = "Procedia Structural Integrity",
title = "Crack Resistance of AA6156 Welded Stringer Panels",
pages = "380-376",
volume = "54",
doi = "10.1016/j.prostr.2024.01.096"
}

Sedmak, A., Petrovski, B., Grbović, A., Sedmak, S.,& Milošević, N.. (2024). Crack Resistance of AA6156 Welded Stringer Panels. in Procedia Structural Integrity
Elsevier., 54, 376-380.
https://doi.org/10.1016/j.prostr.2024.01.096

Sedmak A, Petrovski B, Grbović A, Sedmak S, Milošević N. Crack Resistance of AA6156 Welded Stringer Panels. in Procedia Structural Integrity. 2024;54:376-380.
doi:10.1016/j.prostr.2024.01.096 .

Sedmak, Aleksandar, Petrovski, Blagoj, Grbović, Aleksandar, Sedmak, Simon, Milošević, Nenad, "Crack Resistance of AA6156 Welded Stringer Panels" in Procedia Structural Integrity, 54 (2024):376-380,
https://doi.org/10.1016/j.prostr.2024.01.096 . .

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  - Miladinov, Milan
AU  - Sedmak, Simon
AU  - Đorđević, Branislav R.
AU  - Petrović, Ana
AU  - Vučetić, Filip
PY  - 2023
UR  - https://main.scientific.net/book/book-of-abstracts-from-9th-international-scientific-conference-on-advances-in-mechanical-engineering/978-3-0364-1445-4/ebook
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7170
AB  - This paper deals with damage analysis of gear ring after manufacturing process, just before in-service period. Tooth gear ring segments were made of 40MnCrSi3V low-alloyed cast steel, which chemical composition and mechanical properties were given in table 1 and 2, respectively. Concerning parent material characteristics, in this case low-alloyed cast steel 40 MnCrSi3V, inspection and control of gear segments were necessary to be performed after manufacturing. Non-destructive testing method with magnet particles (MT) of fluorescent suspension of particle size 3 µm was performed for potential defects detection. Surface indications were observed on 8 out of 12 gear segments on these new parts, where the lengths of the cracks goes up to 110 mm. Some of the observed defects were shown in Fig. 1. Defects were located in segments main body the gear teeth, its main body etc. Taking into account aforementioned, observed defects on new gear ring segments were caused in manufacturing process i.e. by casting process and inadequate cooling rate.
PB  - Trans Tech Publications Ltd, Switzerland
C3  - Book of Abstracts from 9th International Scientific Conference on Advances in Mechanical Engineering (ISCAME, November 9-10, 2023, Debrecen, Hungary)
T1  - Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator
SP  - 67
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7170
ER  - 

@conference{
author = "Miladinov, Milan and Sedmak, Simon and Đorđević, Branislav R. and Petrović, Ana and Vučetić, Filip",
year = "2023",
abstract = "This paper deals with damage analysis of gear ring after manufacturing process, just before in-service period. Tooth gear ring segments were made of 40MnCrSi3V low-alloyed cast steel, which chemical composition and mechanical properties were given in table 1 and 2, respectively. Concerning parent material characteristics, in this case low-alloyed cast steel 40 MnCrSi3V, inspection and control of gear segments were necessary to be performed after manufacturing. Non-destructive testing method with magnet particles (MT) of fluorescent suspension of particle size 3 µm was performed for potential defects detection. Surface indications were observed on 8 out of 12 gear segments on these new parts, where the lengths of the cracks goes up to 110 mm. Some of the observed defects were shown in Fig. 1. Defects were located in segments main body the gear teeth, its main body etc. Taking into account aforementioned, observed defects on new gear ring segments were caused in manufacturing process i.e. by casting process and inadequate cooling rate.",
publisher = "Trans Tech Publications Ltd, Switzerland",
journal = "Book of Abstracts from 9th International Scientific Conference on Advances in Mechanical Engineering (ISCAME, November 9-10, 2023, Debrecen, Hungary)",
title = "Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator",
pages = "67",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7170"
}

Miladinov, M., Sedmak, S., Đorđević, B. R., Petrović, A.,& Vučetić, F.. (2023). Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator. in Book of Abstracts from 9th International Scientific Conference on Advances in Mechanical Engineering (ISCAME, November 9-10, 2023, Debrecen, Hungary)
Trans Tech Publications Ltd, Switzerland., 2, 67.
https://hdl.handle.net/21.15107/rcub_machinery_7170

Miladinov M, Sedmak S, Đorđević BR, Petrović A, Vučetić F. Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator. in Book of Abstracts from 9th International Scientific Conference on Advances in Mechanical Engineering (ISCAME, November 9-10, 2023, Debrecen, Hungary). 2023;2:67.
https://hdl.handle.net/21.15107/rcub_machinery_7170 .

Miladinov, Milan, Sedmak, Simon, Đorđević, Branislav R., Petrović, Ana, Vučetić, Filip, "Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator" in Book of Abstracts from 9th International Scientific Conference on Advances in Mechanical Engineering (ISCAME, November 9-10, 2023, Debrecen, Hungary), 2 (2023):67,
https://hdl.handle.net/21.15107/rcub_machinery_7170 .

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  - CONF
AU  - Grbović, Aleksandar
AU  - Eldwaib, Khalid Ahmed
AU  - Kastratović, Gordana
AU  - Čolić, Katarina
AU  - Sedmak, Simon
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7109
AB  - Fatigue cracks growth in three different wing spar geometries is simulated using xFEM, as the most suitable numerical method for this purpose. The goal of this analysis was to find out how crack paths affect number of cycles, i.e. fatigue life, so that the optimal geometry can be defined. The extended finite element method was applied using Morfeo/Crack for Abaqus software. Results provided better understanding and prediction of multiple cracks propagation in complex 3D structures and provided data for the optimal design of wing spar.
C3  - Procedia Structural Integrity
T1  - Predicting fatigue crack growth in complex geometries using numerical methods
EP  - 61
SP  - 56
VL  - 46
DO  - 10.1016/j.prostr.2023.06.010
ER  - 

@conference{
author = "Grbović, Aleksandar and Eldwaib, Khalid Ahmed and Kastratović, Gordana and Čolić, Katarina and Sedmak, Simon",
year = "2023",
abstract = "Fatigue cracks growth in three different wing spar geometries is simulated using xFEM, as the most suitable numerical method for this purpose. The goal of this analysis was to find out how crack paths affect number of cycles, i.e. fatigue life, so that the optimal geometry can be defined. The extended finite element method was applied using Morfeo/Crack for Abaqus software. Results provided better understanding and prediction of multiple cracks propagation in complex 3D structures and provided data for the optimal design of wing spar.",
journal = "Procedia Structural Integrity",
title = "Predicting fatigue crack growth in complex geometries using numerical methods",
pages = "61-56",
volume = "46",
doi = "10.1016/j.prostr.2023.06.010"
}

Grbović, A., Eldwaib, K. A., Kastratović, G., Čolić, K.,& Sedmak, S.. (2023). Predicting fatigue crack growth in complex geometries using numerical methods. in Procedia Structural Integrity, 46, 56-61.
https://doi.org/10.1016/j.prostr.2023.06.010

Grbović A, Eldwaib KA, Kastratović G, Čolić K, Sedmak S. Predicting fatigue crack growth in complex geometries using numerical methods. in Procedia Structural Integrity. 2023;46:56-61.
doi:10.1016/j.prostr.2023.06.010 .

Grbović, Aleksandar, Eldwaib, Khalid Ahmed, Kastratović, Gordana, Čolić, Katarina, Sedmak, Simon, "Predicting fatigue crack growth in complex geometries using numerical methods" in Procedia Structural Integrity, 46 (2023):56-61,
https://doi.org/10.1016/j.prostr.2023.06.010 . .

TY  - JOUR
AU  - Perković, Srđa
AU  - Sedmak, Aleksandar
AU  - Radaković, Zoran
AU  - Burzić, Zijah
AU  - Sedmak, Simon
AU  - Radović, Ljubica
AU  - Mandić, Ivana
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6886
AB  - The search for alternative materials that can be used for parts of aircraft hydraulic systems has led to the idea of applying S32750 duplex steel for this purpose. This steel is mainly used in the oil and gas, chemical, and food industries. The reasons for this lie in this material’s exceptional welding, mechanical, and corrosion resistance properties. In order to verify this material’s suitability for aircraft engineering applications, it is necessary to investigate its behaviour at various temperatures, since aircrafts operate at a wide range of temperatures. For this reason, the effect of temperatures in the range from +20 °C to −80 °C on impact toughness was investigated in the case of S32750 duplex steel and its welded joints. Testing was performed using an instrumented pendulum to obtain force-time and energy-time diagrams, which allowed for more detailed assessment of the effect of testing temperature on total impact energy and its components of crack initiation energy and crack propagation energy. Testing was performed on standard Charpy specimens extracted from base metal (BM), welded metal (WM), and the heat-affected zone (HAZ). The results of these tests indicated high values of both crack initiation and propagation energies at room temperature for all the zones (BM, WM, and HAZ) and sufficient levels of crack propagation and total impact energies above −50 °C. In addition, fractography was conducted through optical microscopy (OM) and scanning electron microscopy (SEM), indicating ductile vs. cleavage fracture surface areas, which corresponded well with the impact toughness values. The results of this research confirm that the use of S32750 duplex steel in the manufacturing of aircraft hydraulic systems has considerable potential, and future work should confirm this.
PB  - MDPI
T2  - Materials
T1  - Effect of temperature on S32750 duplex steel welded joint impact toughness
IS  - 12
VL  - 16
DO  - 10.3390/ma16124432
ER  - 

@article{
author = "Perković, Srđa and Sedmak, Aleksandar and Radaković, Zoran and Burzić, Zijah and Sedmak, Simon and Radović, Ljubica and Mandić, Ivana",
year = "2023",
abstract = "The search for alternative materials that can be used for parts of aircraft hydraulic systems has led to the idea of applying S32750 duplex steel for this purpose. This steel is mainly used in the oil and gas, chemical, and food industries. The reasons for this lie in this material’s exceptional welding, mechanical, and corrosion resistance properties. In order to verify this material’s suitability for aircraft engineering applications, it is necessary to investigate its behaviour at various temperatures, since aircrafts operate at a wide range of temperatures. For this reason, the effect of temperatures in the range from +20 °C to −80 °C on impact toughness was investigated in the case of S32750 duplex steel and its welded joints. Testing was performed using an instrumented pendulum to obtain force-time and energy-time diagrams, which allowed for more detailed assessment of the effect of testing temperature on total impact energy and its components of crack initiation energy and crack propagation energy. Testing was performed on standard Charpy specimens extracted from base metal (BM), welded metal (WM), and the heat-affected zone (HAZ). The results of these tests indicated high values of both crack initiation and propagation energies at room temperature for all the zones (BM, WM, and HAZ) and sufficient levels of crack propagation and total impact energies above −50 °C. In addition, fractography was conducted through optical microscopy (OM) and scanning electron microscopy (SEM), indicating ductile vs. cleavage fracture surface areas, which corresponded well with the impact toughness values. The results of this research confirm that the use of S32750 duplex steel in the manufacturing of aircraft hydraulic systems has considerable potential, and future work should confirm this.",
publisher = "MDPI",
journal = "Materials",
title = "Effect of temperature on S32750 duplex steel welded joint impact toughness",
number = "12",
volume = "16",
doi = "10.3390/ma16124432"
}

Perković, S., Sedmak, A., Radaković, Z., Burzić, Z., Sedmak, S., Radović, L.,& Mandić, I.. (2023). Effect of temperature on S32750 duplex steel welded joint impact toughness. in Materials
MDPI., 16(12).
https://doi.org/10.3390/ma16124432

Perković S, Sedmak A, Radaković Z, Burzić Z, Sedmak S, Radović L, Mandić I. Effect of temperature on S32750 duplex steel welded joint impact toughness. in Materials. 2023;16(12).
doi:10.3390/ma16124432 .

Perković, Srđa, Sedmak, Aleksandar, Radaković, Zoran, Burzić, Zijah, Sedmak, Simon, Radović, Ljubica, Mandić, Ivana, "Effect of temperature on S32750 duplex steel welded joint impact toughness" in Materials, 16, no. 12 (2023),
https://doi.org/10.3390/ma16124432 . .

TY  - JOUR
AU  - Perković, Srđa
AU  - Radaković, Zoran
AU  - Burzić, Zijah
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Radović, Ljubica
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6885
AB  - The paper presents the effect of stress concentration on duplex steel S32750 (according to UNS standards or W.Nr. 1.4410 according to EN standards) behaviour under impact loading. This analysis is based on the results obtained by experimental testing, with particular focus on the influence of crack-like defects on material behaviour under impact load.
AB  - Predmet rada je analiza uticaja koncentracije napona na ponašanje dupleks čelika S32750 (prema UNS standardu ili W.Nr. 1.4410 prema EN standard) pri udarnom opterećenju. Na osnovu dobijenih rezultata ispitivanja, analiziran je uticaj prisustva greške tipa prsline na ponašanje materijala predviđenog za udarno opterećenje.
PB  - Society for Structural Integrity and Life - DIVK (Društvo za integritet i vek konstrukcija - DIVK)
PB  - Institute for Materials Testing - IMS (Institut za ispitivanje materijala - IMS)
T2  - Structural Integrity and Life (Integritet i vek konstrukcija)
T1  - Stress concentration effects on toughness value of duplex steel S32750
T1  - Uticaj koncentracije napona na vrednost žilavosti dupleks čelika S32750
EP  - 7
IS  - 1
SP  - 3
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6885
ER  - 

@article{
author = "Perković, Srđa and Radaković, Zoran and Burzić, Zijah and Sedmak, Simon and Sedmak, Aleksandar and Radović, Ljubica",
year = "2023",
abstract = "The paper presents the effect of stress concentration on duplex steel S32750 (according to UNS standards or W.Nr. 1.4410 according to EN standards) behaviour under impact loading. This analysis is based on the results obtained by experimental testing, with particular focus on the influence of crack-like defects on material behaviour under impact load., Predmet rada je analiza uticaja koncentracije napona na ponašanje dupleks čelika S32750 (prema UNS standardu ili W.Nr. 1.4410 prema EN standard) pri udarnom opterećenju. Na osnovu dobijenih rezultata ispitivanja, analiziran je uticaj prisustva greške tipa prsline na ponašanje materijala predviđenog za udarno opterećenje.",
publisher = "Society for Structural Integrity and Life - DIVK (Društvo za integritet i vek konstrukcija - DIVK), Institute for Materials Testing - IMS (Institut za ispitivanje materijala - IMS)",
journal = "Structural Integrity and Life (Integritet i vek konstrukcija)",
title = "Stress concentration effects on toughness value of duplex steel S32750, Uticaj koncentracije napona na vrednost žilavosti dupleks čelika S32750",
pages = "7-3",
number = "1",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6885"
}

Perković, S., Radaković, Z., Burzić, Z., Sedmak, S., Sedmak, A.,& Radović, L.. (2023). Stress concentration effects on toughness value of duplex steel S32750. in Structural Integrity and Life (Integritet i vek konstrukcija)
Society for Structural Integrity and Life - DIVK (Društvo za integritet i vek konstrukcija - DIVK)., 23(1), 3-7.
https://hdl.handle.net/21.15107/rcub_machinery_6885

Perković S, Radaković Z, Burzić Z, Sedmak S, Sedmak A, Radović L. Stress concentration effects on toughness value of duplex steel S32750. in Structural Integrity and Life (Integritet i vek konstrukcija). 2023;23(1):3-7.
https://hdl.handle.net/21.15107/rcub_machinery_6885 .

Perković, Srđa, Radaković, Zoran, Burzić, Zijah, Sedmak, Simon, Sedmak, Aleksandar, Radović, Ljubica, "Stress concentration effects on toughness value of duplex steel S32750" in Structural Integrity and Life (Integritet i vek konstrukcija), 23, no. 1 (2023):3-7,
https://hdl.handle.net/21.15107/rcub_machinery_6885 .

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  - Jovanović, Aleksandar
AU  - Đorđević, Branislav
AU  - Jeremić, Lazar
AU  - Sedmak, Simon
AU  - Petrović, Ana
PY  - 2023
UR  - http://divk.inovacionicentar.rs/ivk/ivk23/OF2302-2.html
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7106
AB  - Risk analysis of containers in a coal drying facility was performed using the Failure Modes and Effects Analysis (FMEA) method in combination with the risk matrix. The selected exploitation period analysed for all vessels was 5 years, since there is a lot of data about the maintenance performed during this period, including results of material testing performed by an accredited laboratory. Based on all issues detected by testing, risk probabilities (with corresponding levels of severity) of various defects were calculated, and potential expected repair costs determined. These probabilities were then used as input for the risk matrix which indicated the most critical types of defects, both in terms of occurring probability and the severity of their occurrence. It was concluded that through-thickness cracks were the most dangerous defect in this case. Furthermore, high probabilities of most defects considered, implied that containers will become unreliable and unfit for continued exploitation in the near future. Suggested means of preventing failures include a more thorough periodic maintenance and control of these vessels, until it is possible to fully replace them with new equipment.
PB  - Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“, Institut za ispitivanje materijala (IMS), Beograd
T2  - STRUCTURAL INTEGRITY AND LIFE
T1  - INSPECTION OF DAMAGE AND RISK ANALYSIS OF CONTAINERS IN A COAL DRYING FACILITY IN EXPLOITATION
EP  - 115
IS  - 2
SP  - 111
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7106
ER  - 

@article{
author = "Jovanović, Aleksandar and Đorđević, Branislav and Jeremić, Lazar and Sedmak, Simon and Petrović, Ana",
year = "2023",
abstract = "Risk analysis of containers in a coal drying facility was performed using the Failure Modes and Effects Analysis (FMEA) method in combination with the risk matrix. The selected exploitation period analysed for all vessels was 5 years, since there is a lot of data about the maintenance performed during this period, including results of material testing performed by an accredited laboratory. Based on all issues detected by testing, risk probabilities (with corresponding levels of severity) of various defects were calculated, and potential expected repair costs determined. These probabilities were then used as input for the risk matrix which indicated the most critical types of defects, both in terms of occurring probability and the severity of their occurrence. It was concluded that through-thickness cracks were the most dangerous defect in this case. Furthermore, high probabilities of most defects considered, implied that containers will become unreliable and unfit for continued exploitation in the near future. Suggested means of preventing failures include a more thorough periodic maintenance and control of these vessels, until it is possible to fully replace them with new equipment.",
publisher = "Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“, Institut za ispitivanje materijala (IMS), Beograd",
journal = "STRUCTURAL INTEGRITY AND LIFE",
title = "INSPECTION OF DAMAGE AND RISK ANALYSIS OF CONTAINERS IN A COAL DRYING FACILITY IN EXPLOITATION",
pages = "115-111",
number = "2",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7106"
}

Jovanović, A., Đorđević, B., Jeremić, L., Sedmak, S.,& Petrović, A.. (2023). INSPECTION OF DAMAGE AND RISK ANALYSIS OF CONTAINERS IN A COAL DRYING FACILITY IN EXPLOITATION. in STRUCTURAL INTEGRITY AND LIFE
Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“, Institut za ispitivanje materijala (IMS), Beograd., 23(2), 111-115.
https://hdl.handle.net/21.15107/rcub_machinery_7106

Jovanović A, Đorđević B, Jeremić L, Sedmak S, Petrović A. INSPECTION OF DAMAGE AND RISK ANALYSIS OF CONTAINERS IN A COAL DRYING FACILITY IN EXPLOITATION. in STRUCTURAL INTEGRITY AND LIFE. 2023;23(2):111-115.
https://hdl.handle.net/21.15107/rcub_machinery_7106 .

Jovanović, Aleksandar, Đorđević, Branislav, Jeremić, Lazar, Sedmak, Simon, Petrović, Ana, "INSPECTION OF DAMAGE AND RISK ANALYSIS OF CONTAINERS IN A COAL DRYING FACILITY IN EXPLOITATION" in STRUCTURAL INTEGRITY AND LIFE, 23, no. 2 (2023):111-115,
https://hdl.handle.net/21.15107/rcub_machinery_7106 .

TY  - JOUR
AU  - Adžiev, Gorgi
AU  - Sedmak, Aleksandar
AU  - Sedmak, Simon
AU  - Adžiev, Todor
AU  - Radaković, Zoran
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7108
AB  - The mismatching constraint effect on crack propagation through the heat-affected zone (HAZ) in a welded joint is presented in this paper. It is shown that due to this effect, the fracture behavior of an overmatched welded joint depends on the mechanical properties and the size of the region of the crack tip location, as well as on the properties and the size of surrounding regions. The finite element analysis of high-strength low-alloyed (HSLA) steel welded joints with crack tips in the heat-affected zone is performed based on previous experimental work. Two locations of the crack tip are analyzed: fine-grained HAZ (FGHAZ) and coarse-grained HAZ (CGHAZ). In both cases, after the initial propagation of the crack in FGHAZ or CGHAZ, its propagation is directed toward more ductile base metal, thus increasing the fracture resistance of a welded joint. Some new observations about the reasons for such behavior due to crack tip strain fields are presented as well.
T1  - Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint
IS  - 8
VL  - 46
DO  - 10.1111/ffe.14030
ER  - 

@article{
author = "Adžiev, Gorgi and Sedmak, Aleksandar and Sedmak, Simon and Adžiev, Todor and Radaković, Zoran",
year = "2023",
abstract = "The mismatching constraint effect on crack propagation through the heat-affected zone (HAZ) in a welded joint is presented in this paper. It is shown that due to this effect, the fracture behavior of an overmatched welded joint depends on the mechanical properties and the size of the region of the crack tip location, as well as on the properties and the size of surrounding regions. The finite element analysis of high-strength low-alloyed (HSLA) steel welded joints with crack tips in the heat-affected zone is performed based on previous experimental work. Two locations of the crack tip are analyzed: fine-grained HAZ (FGHAZ) and coarse-grained HAZ (CGHAZ). In both cases, after the initial propagation of the crack in FGHAZ or CGHAZ, its propagation is directed toward more ductile base metal, thus increasing the fracture resistance of a welded joint. Some new observations about the reasons for such behavior due to crack tip strain fields are presented as well.",
title = "Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint",
number = "8",
volume = "46",
doi = "10.1111/ffe.14030"
}

Adžiev, G., Sedmak, A., Sedmak, S., Adžiev, T.,& Radaković, Z.. (2023). Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint. , 46(8).
https://doi.org/10.1111/ffe.14030

Adžiev G, Sedmak A, Sedmak S, Adžiev T, Radaković Z. Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint. 2023;46(8).
doi:10.1111/ffe.14030 .

Adžiev, Gorgi, Sedmak, Aleksandar, Sedmak, Simon, Adžiev, Todor, Radaković, Zoran, "Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint", 46, no. 8 (2023),
https://doi.org/10.1111/ffe.14030 . .

TY  - CONF
AU  - Smoljanić, Tamara
AU  - Sedmak, Simon
AU  - Milovanović, Aleksa
AU  - Milović, Ljubica
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7110
AB  - One of the most important aspects of materials typically used in biomedical engineering is their resistance to various unfavourable exploitation conditions, which greatly impact their work life. In terms of extreme conditions, two major factors include fatigue and corrosion, and a combination of these can significantly decrease the expected life of various implants. The focus of this paper will be on hip implants made of Ti-Al6-4V titanium alloy, a material commonly used in such applications, due to its resistance to corrosion and bio-compatibility. Research shown here was based on experimental testing of said alloy in order to determine its mechanical properties under different working environments, including normal, salty and wet conditions. These properties were then used as input data for Extended Finite Element method (XFEM) numerical simulations of fatigue crack growth in hip implants with various geometries. This was of particular interest since specimens which were kept in salty and wet environment had a slight degradation of yield stress and tensile strength, but an increase in plasticity.
C3  - Procedia Structural Integrity
T1  - Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions
EP  - 221
SP  - 215
VL  - 48
DO  - 10.1016/j.prostr.2023.07.151
ER  - 

@conference{
author = "Smoljanić, Tamara and Sedmak, Simon and Milovanović, Aleksa and Milović, Ljubica",
year = "2023",
abstract = "One of the most important aspects of materials typically used in biomedical engineering is their resistance to various unfavourable exploitation conditions, which greatly impact their work life. In terms of extreme conditions, two major factors include fatigue and corrosion, and a combination of these can significantly decrease the expected life of various implants. The focus of this paper will be on hip implants made of Ti-Al6-4V titanium alloy, a material commonly used in such applications, due to its resistance to corrosion and bio-compatibility. Research shown here was based on experimental testing of said alloy in order to determine its mechanical properties under different working environments, including normal, salty and wet conditions. These properties were then used as input data for Extended Finite Element method (XFEM) numerical simulations of fatigue crack growth in hip implants with various geometries. This was of particular interest since specimens which were kept in salty and wet environment had a slight degradation of yield stress and tensile strength, but an increase in plasticity.",
journal = "Procedia Structural Integrity",
title = "Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions",
pages = "221-215",
volume = "48",
doi = "10.1016/j.prostr.2023.07.151"
}

Smoljanić, T., Sedmak, S., Milovanović, A.,& Milović, L.. (2023). Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions. in Procedia Structural Integrity, 48, 215-221.
https://doi.org/10.1016/j.prostr.2023.07.151

Smoljanić T, Sedmak S, Milovanović A, Milović L. Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions. in Procedia Structural Integrity. 2023;48:215-221.
doi:10.1016/j.prostr.2023.07.151 .

Smoljanić, Tamara, Sedmak, Simon, Milovanović, Aleksa, Milović, Ljubica, "Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions" in Procedia Structural Integrity, 48 (2023):215-221,
https://doi.org/10.1016/j.prostr.2023.07.151 . .

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  - JOUR
AU  - Smoljanić, Tamara
AU  - Milovanović, Aleksa
AU  - Sedmak, Simon
AU  - Milović, Ljubica
AU  - Sedmak, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7428
AB  - This paper presents development of numerical models for simulation of the behaviour of titanium alloy hip implants under static and dynamic loads, which is a part of extensive research involving the structural integrity of such implants under various loading conditions, as well as under exposure to aggressive environments. Numerical models were created in ABAQUS and ANSYS software packages, in order to determine the stress/strain distribution, the number of cycles to failure and stress intensity factors, for two different hip implant geometries. The ABAQUS models were used for static and ANSYS models for dynamic loads. The next stage in this analysis involved comparing these two cases, to determine the one with the better behaviour, depending on the exploitation conditions, which can greatly vary between different groups of patients. The targeted patient weight for all numerical simulations was 90 kg, while failure assessment diagrams were made for both implant geometries, assuming a crack length of 1 mm.
T2  - HEMIJSKA INDUSTRIJA (Chemical Industry)
T1  - Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads
DO  - 10.2298/HEMIND221118026S
ER  - 

@article{
author = "Smoljanić, Tamara and Milovanović, Aleksa and Sedmak, Simon and Milović, Ljubica and Sedmak, Aleksandar",
year = "2023",
abstract = "This paper presents development of numerical models for simulation of the behaviour of titanium alloy hip implants under static and dynamic loads, which is a part of extensive research involving the structural integrity of such implants under various loading conditions, as well as under exposure to aggressive environments. Numerical models were created in ABAQUS and ANSYS software packages, in order to determine the stress/strain distribution, the number of cycles to failure and stress intensity factors, for two different hip implant geometries. The ABAQUS models were used for static and ANSYS models for dynamic loads. The next stage in this analysis involved comparing these two cases, to determine the one with the better behaviour, depending on the exploitation conditions, which can greatly vary between different groups of patients. The targeted patient weight for all numerical simulations was 90 kg, while failure assessment diagrams were made for both implant geometries, assuming a crack length of 1 mm.",
journal = "HEMIJSKA INDUSTRIJA (Chemical Industry)",
title = "Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads",
doi = "10.2298/HEMIND221118026S"
}

Smoljanić, T., Milovanović, A., Sedmak, S., Milović, L.,& Sedmak, A.. (2023). Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads. in HEMIJSKA INDUSTRIJA (Chemical Industry).
https://doi.org/10.2298/HEMIND221118026S

Smoljanić T, Milovanović A, Sedmak S, Milović L, Sedmak A. Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads. in HEMIJSKA INDUSTRIJA (Chemical Industry). 2023;.
doi:10.2298/HEMIND221118026S .

Smoljanić, Tamara, Milovanović, Aleksa, Sedmak, Simon, Milović, Ljubica, Sedmak, Aleksandar, "Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads" in HEMIJSKA INDUSTRIJA (Chemical Industry) (2023),
https://doi.org/10.2298/HEMIND221118026S . .

TY  - JOUR
AU  - Gorgi, Adziev
AU  - Sedmak, Aleksandar
AU  - Sedmak, Simon
AU  - Adžiev, Todor
AU  - Radaković, Zoran
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7758
AB  - The mismatching constraint effect on crack propagation through the heat‐affected zone (HAZ) in a welded joint is presented in this paper. It is shown that due to this effect, the fracture behavior of an overmatched welded joint depends on the mechanical properties and the size of the region of the crack tip location, as well as on the properties and the size of surrounding regions. The finite element analysis of high‐strength low‐alloyed (HSLA) steel welded joints with crack tips in the heat‐affected zone is performed based on previous experimental work. Two locations of the crack tip are analyzed: fine‐grained HAZ (FGHAZ) and coarse‐grained HAZ (CGHAZ). In both cases, after the initial propagation of the crack in FGHAZ or CGHAZ, its propagation is directed toward more ductile base metal, thus increasing the fracture resistance of a welded joint. Some new observations about the reasons for such behavior due to crack tip strain fields are presented as well.
PB  - John Wiley & Sons Ltd.
T2  - Fatigue & Fracture of Engineering Materials & Structures
T1  - Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint
EP  - 3028
IS  - 8
SP  - 3014
VL  - 46
DO  - 10.1111/ffe.14030
ER  - 

@article{
author = "Gorgi, Adziev and Sedmak, Aleksandar and Sedmak, Simon and Adžiev, Todor and Radaković, Zoran",
year = "2023",
abstract = "The mismatching constraint effect on crack propagation through the heat‐affected zone (HAZ) in a welded joint is presented in this paper. It is shown that due to this effect, the fracture behavior of an overmatched welded joint depends on the mechanical properties and the size of the region of the crack tip location, as well as on the properties and the size of surrounding regions. The finite element analysis of high‐strength low‐alloyed (HSLA) steel welded joints with crack tips in the heat‐affected zone is performed based on previous experimental work. Two locations of the crack tip are analyzed: fine‐grained HAZ (FGHAZ) and coarse‐grained HAZ (CGHAZ). In both cases, after the initial propagation of the crack in FGHAZ or CGHAZ, its propagation is directed toward more ductile base metal, thus increasing the fracture resistance of a welded joint. Some new observations about the reasons for such behavior due to crack tip strain fields are presented as well.",
publisher = "John Wiley & Sons Ltd.",
journal = "Fatigue & Fracture of Engineering Materials & Structures",
title = "Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint",
pages = "3028-3014",
number = "8",
volume = "46",
doi = "10.1111/ffe.14030"
}

Gorgi, A., Sedmak, A., Sedmak, S., Adžiev, T.,& Radaković, Z.. (2023). Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint. in Fatigue & Fracture of Engineering Materials & Structures
John Wiley & Sons Ltd.., 46(8), 3014-3028.
https://doi.org/10.1111/ffe.14030

Gorgi A, Sedmak A, Sedmak S, Adžiev T, Radaković Z. Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint. in Fatigue & Fracture of Engineering Materials & Structures. 2023;46(8):3014-3028.
doi:10.1111/ffe.14030 .

Gorgi, Adziev, Sedmak, Aleksandar, Sedmak, Simon, Adžiev, Todor, Radaković, Zoran, "Crack tip fields effects on crack propagation through the heat affected zone in an overmatched welded joint" in Fatigue & Fracture of Engineering Materials & Structures, 46, no. 8 (2023):3014-3028,
https://doi.org/10.1111/ffe.14030 . .

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  - Milovanović, A. M.
AU  - Sedmak, Aleksandar
AU  - Milovanović, Nikola
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
PY  - 2023
UR  - https://web.fe.up.pt/~iras/wp-content/uploads/2023/04/Book-of-abstracts-IRAS-2023-rev-2.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7094
AB  - Stress distribution, as obtained by the finite element method (FEM), and corresponding fracture mechanics parameters, have been used to assess integrity of a pressure vessel. Once the stress distribution is known, the most critical area can be analysed with assumed crack to estimate its critical length according to fracture mechanics parameters and basic laws. Toward this end, the Failure Assessment Diagram(FAD) is used to calculate the crack length corresponding to the limit curve. Once net stress and stress intensity factor are known, as well as their critical values, coordinates of a point corresponding to any crack length can be calculated and positioned in the FAD.
PB  - Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“
C3  - PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUMONRISK ANALYSIS AND SAFETY OF COMPLEX STRUCTURESANDCOMPONENTS - IRAS 2023
T1  - Finite element and fracture mechanics analysis of a cracked oil-storage tank
SP  - 76
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7094
ER  - 

@conference{
author = "Milovanović, A. M. and Sedmak, Aleksandar and Milovanović, Nikola and Đorđević, Branislav and Sedmak, Simon",
year = "2023",
abstract = "Stress distribution, as obtained by the finite element method (FEM), and corresponding fracture mechanics parameters, have been used to assess integrity of a pressure vessel. Once the stress distribution is known, the most critical area can be analysed with assumed crack to estimate its critical length according to fracture mechanics parameters and basic laws. Toward this end, the Failure Assessment Diagram(FAD) is used to calculate the crack length corresponding to the limit curve. Once net stress and stress intensity factor are known, as well as their critical values, coordinates of a point corresponding to any crack length can be calculated and positioned in the FAD.",
publisher = "Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“",
journal = "PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUMONRISK ANALYSIS AND SAFETY OF COMPLEX STRUCTURESANDCOMPONENTS - IRAS 2023",
title = "Finite element and fracture mechanics analysis of a cracked oil-storage tank",
pages = "76",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7094"
}

Milovanović, A. M., Sedmak, A., Milovanović, N., Đorđević, B.,& Sedmak, S.. (2023). Finite element and fracture mechanics analysis of a cracked oil-storage tank. in PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUMONRISK ANALYSIS AND SAFETY OF COMPLEX STRUCTURESANDCOMPONENTS - IRAS 2023
Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“., 76.
https://hdl.handle.net/21.15107/rcub_machinery_7094

Milovanović AM, Sedmak A, Milovanović N, Đorđević B, Sedmak S. Finite element and fracture mechanics analysis of a cracked oil-storage tank. in PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUMONRISK ANALYSIS AND SAFETY OF COMPLEX STRUCTURESANDCOMPONENTS - IRAS 2023. 2023;:76.
https://hdl.handle.net/21.15107/rcub_machinery_7094 .

Milovanović, A. M., Sedmak, Aleksandar, Milovanović, Nikola, Đorđević, Branislav, Sedmak, Simon, "Finite element and fracture mechanics analysis of a cracked oil-storage tank" in PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUMONRISK ANALYSIS AND SAFETY OF COMPLEX STRUCTURESANDCOMPONENTS - IRAS 2023 (2023):76,
https://hdl.handle.net/21.15107/rcub_machinery_7094 .

TY  - GEN
AU  - Sedmak, Simon
AU  - Đorđević, Branislav
AU  - Correia, Jose A. F. O.
AU  - De Jesus, Abilio M. P.
AU  - Sedmak, Aleksandar
PY  - 2023
UR  - https://web.fe.up.pt/~iras/wp-content/uploads/2023/04/Book-of-abstracts-IRAS-2023-rev-2.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7437
AB  - Dear Colleagues, Dear Friends,
With great pleasure that we welcome you to our beautiful city of Belgrade (Serbia) for the second edition of the International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023). But first, a couple of words about the Technical Committee in charge of the conference. The tasks and objectives of the Technical Committee are the following: ‐ consolidation of the European scientific community to solve scientific and technical safety problems; ‐ development of perspective research directions, computational and experimental methods and technologies in the area of safety of engineering systems; ‐ cooperative researches, held by specialists an scientists from various countries on behalf of reducing the rate of accident risks while operating dangerous objects and systems; ‐ development of modelling the incident theory of large technical systems; ‐ development of mechanical and mathematical models and risk‐analysis technologies; ‐ development of reliability and probabilistic approaches for the fatigue and fracture characterization of materials (metals, polymers, composites among others) and structures (metallic, composite, joints, etc); ‐ elaboration of standards using methods of probabilistic risk‐analysis of technical systems according to fracture mechanics criteria; ‐ elaboration of standards using reliability and probabilistic models for the large structures and components according to local criteria; ‐ elaboration of standards using risk models of complex hierarchical technical systems; ‐ unification of approaches to safety analysis of large technical systems; ‐ unification of analysis methods of information on technical condition of large technical systems; ‐ creation of unified methods and the harmonization of national regulatory documents in the area of technical systems safety; ‐ elaboration of special study courses, problem books and test books on fracture mechanics, fatigue, reliability theory, and risk‐analysis of technical systems. The Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 20233) is organised by ESIS TC12 (with support from local institutions, such as the Faculty of Mechanical Engineering and its Innovation Center). It will take place in the Faculty of Mechanical Engineering of the University of Belgrade, in the City of Belgrade, the capital of Serbia, from 2‐4 April 2023. This conference is intended as a forum for discussion about recent advances in the aforementioned topics, including maintenance, safety, risk analysis, probabilistic assessment, life‐cycle performance, fatigue, fracture, damage mechanics, numerical simulations of a wide range of infrastructures, such as engineering technical systems, transportation systems and their applications in various fields, such as civil, mechanical, aerospace, traffic and chemical engineering, as well as to a wide variety of structures and equipment, including but not limited to bridges, buildings, dams, railways, pipelines, wind towers, offshore platforms, naval vessels, nuclear and hydropower plants…The Organizing Committee of the IRAS 2023 conference sincerely thanks all contributing authors for playing a significant role in the overall success of this event, with their exciting presentations. The members of the International Scientific Committee are also fully acknowledged for their support of the IRAS 2023 event. Special thanks to the Thematic Sessions Organizers and Plenary Speakers for their dedication and knowledge and energy brought to this event. The Organizing Committee would also like to express their gratitude to the sponsors for their time and support without which the conference would be impossible to organize. Finally, chairmen sincerely thank the tireless efforts of Organizing Committee members, as well as students and other Faculty of Mechanical Engineering Innovation Center of Faculty of Mechanical Engineering staff. 
The second edition of the IRAS 2023 event, organized between 2nd and 4th of April, 2023 at the Faculty of Mechanical Engineering of the University of Belgrade, Serbia, gathered around 80 participants from all over the worlds, with more than 20 nationalities demonstrating the vitality of this new event, both in person and online. This book gathers the abstracts of the works presented in the conference, including keynote lectures and regular presentations alike. In general, the abstracts were organized into chapters, according to the five main topics of the thematic sessions foreseen in the programme of the conference, in accordance with the general topics covered by the TC12.

The editors of the Proceedings of the Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (Book of Abstracts),

SIMON SEDMAK
BRANISLAV ĐORĐEVIĆ
JOSÉ António Fonseca de Oliveira CORREIA
ABÍLIO Manuel Pinho DE JESUS
ALEKSANDAR SEDMAK
PB  - Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“
T1  - BOOK OF ABSTRACTS - Proceedings of the Second International Symposium on Risk analysis and Safety of Complex Structures and Components
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7437
ER  - 

@misc{
author = "Sedmak, Simon and Đorđević, Branislav and Correia, Jose A. F. O. and De Jesus, Abilio M. P. and Sedmak, Aleksandar",
year = "2023",
abstract = "Dear Colleagues, Dear Friends,
With great pleasure that we welcome you to our beautiful city of Belgrade (Serbia) for the second edition of the International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023). But first, a couple of words about the Technical Committee in charge of the conference. The tasks and objectives of the Technical Committee are the following: ‐ consolidation of the European scientific community to solve scientific and technical safety problems; ‐ development of perspective research directions, computational and experimental methods and technologies in the area of safety of engineering systems; ‐ cooperative researches, held by specialists an scientists from various countries on behalf of reducing the rate of accident risks while operating dangerous objects and systems; ‐ development of modelling the incident theory of large technical systems; ‐ development of mechanical and mathematical models and risk‐analysis technologies; ‐ development of reliability and probabilistic approaches for the fatigue and fracture characterization of materials (metals, polymers, composites among others) and structures (metallic, composite, joints, etc); ‐ elaboration of standards using methods of probabilistic risk‐analysis of technical systems according to fracture mechanics criteria; ‐ elaboration of standards using reliability and probabilistic models for the large structures and components according to local criteria; ‐ elaboration of standards using risk models of complex hierarchical technical systems; ‐ unification of approaches to safety analysis of large technical systems; ‐ unification of analysis methods of information on technical condition of large technical systems; ‐ creation of unified methods and the harmonization of national regulatory documents in the area of technical systems safety; ‐ elaboration of special study courses, problem books and test books on fracture mechanics, fatigue, reliability theory, and risk‐analysis of technical systems. The Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 20233) is organised by ESIS TC12 (with support from local institutions, such as the Faculty of Mechanical Engineering and its Innovation Center). It will take place in the Faculty of Mechanical Engineering of the University of Belgrade, in the City of Belgrade, the capital of Serbia, from 2‐4 April 2023. This conference is intended as a forum for discussion about recent advances in the aforementioned topics, including maintenance, safety, risk analysis, probabilistic assessment, life‐cycle performance, fatigue, fracture, damage mechanics, numerical simulations of a wide range of infrastructures, such as engineering technical systems, transportation systems and their applications in various fields, such as civil, mechanical, aerospace, traffic and chemical engineering, as well as to a wide variety of structures and equipment, including but not limited to bridges, buildings, dams, railways, pipelines, wind towers, offshore platforms, naval vessels, nuclear and hydropower plants…The Organizing Committee of the IRAS 2023 conference sincerely thanks all contributing authors for playing a significant role in the overall success of this event, with their exciting presentations. The members of the International Scientific Committee are also fully acknowledged for their support of the IRAS 2023 event. Special thanks to the Thematic Sessions Organizers and Plenary Speakers for their dedication and knowledge and energy brought to this event. The Organizing Committee would also like to express their gratitude to the sponsors for their time and support without which the conference would be impossible to organize. Finally, chairmen sincerely thank the tireless efforts of Organizing Committee members, as well as students and other Faculty of Mechanical Engineering Innovation Center of Faculty of Mechanical Engineering staff. 
The second edition of the IRAS 2023 event, organized between 2nd and 4th of April, 2023 at the Faculty of Mechanical Engineering of the University of Belgrade, Serbia, gathered around 80 participants from all over the worlds, with more than 20 nationalities demonstrating the vitality of this new event, both in person and online. This book gathers the abstracts of the works presented in the conference, including keynote lectures and regular presentations alike. In general, the abstracts were organized into chapters, according to the five main topics of the thematic sessions foreseen in the programme of the conference, in accordance with the general topics covered by the TC12.

The editors of the Proceedings of the Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (Book of Abstracts),

SIMON SEDMAK
BRANISLAV ĐORĐEVIĆ
JOSÉ António Fonseca de Oliveira CORREIA
ABÍLIO Manuel Pinho DE JESUS
ALEKSANDAR SEDMAK",
publisher = "Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“",
title = "BOOK OF ABSTRACTS - Proceedings of the Second International Symposium on Risk analysis and Safety of Complex Structures and Components",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7437"
}

Sedmak, S., Đorđević, B., Correia, J. A. F. O., De Jesus, A. M. P.,& Sedmak, A.. (2023). BOOK OF ABSTRACTS - Proceedings of the Second International Symposium on Risk analysis and Safety of Complex Structures and Components. 
Društvo za integritet i vek konstrukcija „Prof. dr Stojan Sedmak“..
https://hdl.handle.net/21.15107/rcub_machinery_7437

Sedmak S, Đorđević B, Correia JAFO, De Jesus AMP, Sedmak A. BOOK OF ABSTRACTS - Proceedings of the Second International Symposium on Risk analysis and Safety of Complex Structures and Components. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7437 .

Sedmak, Simon, Đorđević, Branislav, Correia, Jose A. F. O., De Jesus, Abilio M. P., Sedmak, Aleksandar, "BOOK OF ABSTRACTS - Proceedings of the Second International Symposium on Risk analysis and Safety of Complex Structures and Components" (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7437 .

TY  - CONF
AU  - Miladinov, Milan
AU  - Sedmak, Simon
AU  - Đorđević, Branislav
AU  - Petrović, Ana
AU  - Vučetić, Filip
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7285
C3  - ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering
T1  - Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator
SP  - 67
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7285
ER  - 

@conference{
author = "Miladinov, Milan and Sedmak, Simon and Đorđević, Branislav and Petrović, Ana and Vučetić, Filip",
year = "2023",
journal = "ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering",
title = "Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator",
pages = "67",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7285"
}

Miladinov, M., Sedmak, S., Đorđević, B., Petrović, A.,& Vučetić, F.. (2023). Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator. in ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering, 67.
https://hdl.handle.net/21.15107/rcub_machinery_7285

Miladinov M, Sedmak S, Đorđević B, Petrović A, Vučetić F. Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator. in ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering. 2023;:67.
https://hdl.handle.net/21.15107/rcub_machinery_7285 .

Miladinov, Milan, Sedmak, Simon, Đorđević, Branislav, Petrović, Ana, Vučetić, Filip, "Damage Analysis on Tooth Gear Ring of a Bucket-Wheel Excavator" in ISCAME - 9th International Scientific Conference on Advances in Mechanical Engineering (2023):67,
https://hdl.handle.net/21.15107/rcub_machinery_7285 .

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  - Miladinov, Milan
AU  - Sedmak, Simon
AU  - Đorđević, Branislav
AU  - Sedmak, Aleksandar
AU  - Vučetić, Filip
AU  - Milivojević, Aleksandar
PY  - 2023
UR  - https://www.sciencedirect.com/journal/procedia-structural-integrity/vol/48/suppl/C
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7101
AB  - Bucket-wheel excavators are continuously working machines for removal of waste and useful materials in open-pit mines, mainly used for mining of lignite. The purpose of a tooth gear ring is to rotate the excavator using two reducers. Due to this, the structural integrity of such elements is of great importance for the safe and reliable operation of the bucket-wheel excavator as a whole. In order to ensure its proper function, non-destructive testing (NDT) methods (namely magnetic particles testing) was performed after casting of gears. NDT revealed the presence of cracks with varying lengths (10-110 mm), which were located in the gear teeth, its main body and the openings used for connections between segments. For this reason, it was necessary to adopt a repair welding technology which would eliminate the cracks. Since the tooth gear ring was made of GS-40MnCrSi3V low-alloyed cast steel, electrode 42 4 B 42 H5 (designation according to EN 499E) was selected as filler material, due to its exceptional mechanical properties, suitability for welding of low-carbon low-alloyed steels and low hydrogen content. Manual arc welding was the procedure used in this case. Since these repairs were all performed on the surface of the tooth gear ring segments, final NDT included only magnetic particle and penetrant testing, both of which had shown that the repair technology was successfully applied, i.e. not new defects were detected in the repaired gear ring elements.
PB  - Elsevier B.V.
C3  - Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023)
T1  - Repairing of cracks on tooth gear ring of a bucket-wheel excavator
EP  - 32
SP  - 27
VL  - 48
DO  - 10.1016/j.prostr.2023.07.106
ER  - 

@conference{
author = "Miladinov, Milan and Sedmak, Simon and Đorđević, Branislav and Sedmak, Aleksandar and Vučetić, Filip and Milivojević, Aleksandar",
year = "2023",
abstract = "Bucket-wheel excavators are continuously working machines for removal of waste and useful materials in open-pit mines, mainly used for mining of lignite. The purpose of a tooth gear ring is to rotate the excavator using two reducers. Due to this, the structural integrity of such elements is of great importance for the safe and reliable operation of the bucket-wheel excavator as a whole. In order to ensure its proper function, non-destructive testing (NDT) methods (namely magnetic particles testing) was performed after casting of gears. NDT revealed the presence of cracks with varying lengths (10-110 mm), which were located in the gear teeth, its main body and the openings used for connections between segments. For this reason, it was necessary to adopt a repair welding technology which would eliminate the cracks. Since the tooth gear ring was made of GS-40MnCrSi3V low-alloyed cast steel, electrode 42 4 B 42 H5 (designation according to EN 499E) was selected as filler material, due to its exceptional mechanical properties, suitability for welding of low-carbon low-alloyed steels and low hydrogen content. Manual arc welding was the procedure used in this case. Since these repairs were all performed on the surface of the tooth gear ring segments, final NDT included only magnetic particle and penetrant testing, both of which had shown that the repair technology was successfully applied, i.e. not new defects were detected in the repaired gear ring elements.",
publisher = "Elsevier B.V.",
journal = "Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023)",
title = "Repairing of cracks on tooth gear ring of a bucket-wheel excavator",
pages = "32-27",
volume = "48",
doi = "10.1016/j.prostr.2023.07.106"
}

Miladinov, M., Sedmak, S., Đorđević, B., Sedmak, A., Vučetić, F.,& Milivojević, A.. (2023). Repairing of cracks on tooth gear ring of a bucket-wheel excavator. in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023)
Elsevier B.V.., 48, 27-32.
https://doi.org/10.1016/j.prostr.2023.07.106

Miladinov M, Sedmak S, Đorđević B, Sedmak A, Vučetić F, Milivojević A. Repairing of cracks on tooth gear ring of a bucket-wheel excavator. in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023). 2023;48:27-32.
doi:10.1016/j.prostr.2023.07.106 .

Miladinov, Milan, Sedmak, Simon, Đorđević, Branislav, Sedmak, Aleksandar, Vučetić, Filip, Milivojević, Aleksandar, "Repairing of cracks on tooth gear ring of a bucket-wheel excavator" in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023), 48 (2023):27-32,
https://doi.org/10.1016/j.prostr.2023.07.106 . .

TY  - CONF
AU  - Đorđević, Branislav
AU  - Sedmak, Aleksandar
AU  - Sedmak, Simon
PY  - 2023
UR  - https://www.sciencedirect.com/journal/procedia-structural-integrity/vol/48/suppl/C
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7097
AB  - The Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) took place between 2-4 April 2023 at the Faculty of Mechanical Engineering of the University of Belgrade. The guest editors of the IRAS 2023 deeply acknowledge all members of the International Scientific Committee, Thematic Sessions Organizers, Keynote Speakers and authors that contributed to the success of this event, which gathered more than 90 participants presenting 88 papers on the spot or online. Sponsors are also fully acknowledged for their important contributions. The ESIS/TC12 2023 winners of the “Robert Moskovic” Award, Award of Merit TC12, and ESIS/TC12 Young Scientist Award were announced during the conference. Additionally, guest editors (conference chairs) sincerely thank the tireless efforts of the Organizing Committee members, as well as students and other staff involved in the organization. Finally, the guest editors are pleased to inform that the third edition of the IRAS event will be organized by Prof. Grzegorz Lesiuk (University of Wroclaw, Poland) and will take place in Wroclaw in Poland in 2025.
C3  - Procedia Structural Integrity
T1  - Editorial of the 2nd IRAS conference
EP  - 3
SP  - 1
VL  - 48
DO  - 10.1016/j.prostr.2023.07.102
ER  - 

@conference{
author = "Đorđević, Branislav and Sedmak, Aleksandar and Sedmak, Simon",
year = "2023",
abstract = "The Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) took place between 2-4 April 2023 at the Faculty of Mechanical Engineering of the University of Belgrade. The guest editors of the IRAS 2023 deeply acknowledge all members of the International Scientific Committee, Thematic Sessions Organizers, Keynote Speakers and authors that contributed to the success of this event, which gathered more than 90 participants presenting 88 papers on the spot or online. Sponsors are also fully acknowledged for their important contributions. The ESIS/TC12 2023 winners of the “Robert Moskovic” Award, Award of Merit TC12, and ESIS/TC12 Young Scientist Award were announced during the conference. Additionally, guest editors (conference chairs) sincerely thank the tireless efforts of the Organizing Committee members, as well as students and other staff involved in the organization. Finally, the guest editors are pleased to inform that the third edition of the IRAS event will be organized by Prof. Grzegorz Lesiuk (University of Wroclaw, Poland) and will take place in Wroclaw in Poland in 2025.",
journal = "Procedia Structural Integrity",
title = "Editorial of the 2nd IRAS conference",
pages = "3-1",
volume = "48",
doi = "10.1016/j.prostr.2023.07.102"
}

Đorđević, B., Sedmak, A.,& Sedmak, S.. (2023). Editorial of the 2nd IRAS conference. in Procedia Structural Integrity, 48, 1-3.
https://doi.org/10.1016/j.prostr.2023.07.102

Đorđević B, Sedmak A, Sedmak S. Editorial of the 2nd IRAS conference. in Procedia Structural Integrity. 2023;48:1-3.
doi:10.1016/j.prostr.2023.07.102 .

Đorđević, Branislav, Sedmak, Aleksandar, Sedmak, Simon, "Editorial of the 2nd IRAS conference" in Procedia Structural Integrity, 48 (2023):1-3,
https://doi.org/10.1016/j.prostr.2023.07.102 . .

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 . .