TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
AU  - Radović, Nenad
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Bajić, Darko
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6008
AB  - This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 welded joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analyzing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding (FSW). Three-dimensional finite element (FE) model has been created in ABAQUS/Explicit software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.
PB  - VINČA Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure
EP  - 320
IS  - 1A
SP  - 311
VL  - 27
DO  - 10.2298/TSCI210216186V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Sedmak, Aleksandar and Radović, Nenad and Međo, Bojan and Mrdak, Mihailo and Bajić, Darko",
year = "2023",
abstract = "This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 welded joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analyzing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding (FSW). Three-dimensional finite element (FE) model has been created in ABAQUS/Explicit software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.",
publisher = "VINČA Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure",
pages = "320-311",
number = "1A",
volume = "27",
doi = "10.2298/TSCI210216186V"
}

Veljić, D., Rakin, M., Sedmak, A., Radović, N., Međo, B., Mrdak, M.,& Bajić, D.. (2023). Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure. in Thermal Science
VINČA Institute of Nuclear Sciences., 27(1A), 311-320.
https://doi.org/10.2298/TSCI210216186V

Veljić D, Rakin M, Sedmak A, Radović N, Međo B, Mrdak M, Bajić D. Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure. in Thermal Science. 2023;27(1A):311-320.
doi:10.2298/TSCI210216186V .

Veljić, Darko, Rakin, Marko, Sedmak, Aleksandar, Radović, Nenad, Međo, Bojan, Mrdak, Mihailo, Bajić, Darko, "Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure" in Thermal Science, 27, no. 1A (2023):311-320,
https://doi.org/10.2298/TSCI210216186V . .

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  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5601
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
SP  - 761
VL  - 15
DO  - 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",
pages = "761",
volume = "15",
doi = "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), 761.
https://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):761.
doi: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):761,
https://doi.org/10.3390/su15010761 . .

TY  - JOUR
AU  - Veljić, Darko M.
AU  - Rakin, Marko P.
AU  - Sedmak, Aleksandar S.
AU  - Radović, Nenad A.
AU  - Međo, Bojan I.
AU  - Mrdak, Mihailo R.
AU  - Bajić, Darko R.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5152
AB  - The influence of friction stir welding parameters on thermo-mechanical behavior of the material during welding is analyzed. An aluminum alloy is considered (Al 2024 T351), and different rotating and welding speeds are applied. The finite element model consists of the working plate (Al alloy), backing plate and welding tool. The influence of the welding conditions on material behavior is taken into account the application of the Johnson-Cook material model. The rotation speed of the tool affects the results. If increased, it contributes to an increase of friction-generated heat intensity. The other component of the generated heat, which stems from the plastic deformation of the material, is negligibly changed. When the welding speed, i.e. tool translation speed, is increased, the intensity of friction-generated heat decreases, while the heat generation due to plastic deforming is becoming more pronounced. Summed, this leads to rather small change of the total generation. The changes of the heat generation influence both the temperature field and reaction force. Also, the inadequate selection of welding parameters resulted in occurrence of the defects (pores) in the model.
PB  - VINČA Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters
EP  - 2134
IS  - 3A
SP  - 2125
VL  - 26
DO  - 10.2298/TSCI210216186V
ER  - 

@article{
author = "Veljić, Darko M. and Rakin, Marko P. and Sedmak, Aleksandar S. and Radović, Nenad A. and Međo, Bojan I. and Mrdak, Mihailo R. and Bajić, Darko R.",
year = "2022",
abstract = "The influence of friction stir welding parameters on thermo-mechanical behavior of the material during welding is analyzed. An aluminum alloy is considered (Al 2024 T351), and different rotating and welding speeds are applied. The finite element model consists of the working plate (Al alloy), backing plate and welding tool. The influence of the welding conditions on material behavior is taken into account the application of the Johnson-Cook material model. The rotation speed of the tool affects the results. If increased, it contributes to an increase of friction-generated heat intensity. The other component of the generated heat, which stems from the plastic deformation of the material, is negligibly changed. When the welding speed, i.e. tool translation speed, is increased, the intensity of friction-generated heat decreases, while the heat generation due to plastic deforming is becoming more pronounced. Summed, this leads to rather small change of the total generation. The changes of the heat generation influence both the temperature field and reaction force. Also, the inadequate selection of welding parameters resulted in occurrence of the defects (pores) in the model.",
publisher = "VINČA Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters",
pages = "2134-2125",
number = "3A",
volume = "26",
doi = "10.2298/TSCI210216186V"
}

Veljić, D. M., Rakin, M. P., Sedmak, A. S., Radović, N. A., Međo, B. I., Mrdak, M. R.,& Bajić, D. R.. (2022). Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters. in Thermal Science
VINČA Institute of Nuclear Sciences., 26(3A), 2125-2134.
https://doi.org/10.2298/TSCI210216186V

Veljić DM, Rakin MP, Sedmak AS, Radović NA, Međo BI, Mrdak MR, Bajić DR. Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters. in Thermal Science. 2022;26(3A):2125-2134.
doi:10.2298/TSCI210216186V .

Veljić, Darko M., Rakin, Marko P., Sedmak, Aleksandar S., Radović, Nenad A., Međo, Bojan I., Mrdak, Mihailo R., Bajić, Darko R., "Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters" in Thermal Science, 26, no. 3A (2022):2125-2134,
https://doi.org/10.2298/TSCI210216186V . .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Hemer, Abubkr
AU  - Sedmak, Simon A.
AU  - Milović, Ljubica
AU  - Grbovic, Aleksandar
AU  - Cabrilo, Aleksandar
AU  - Kljajin, Milan
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4910
AB  - Fatigue crack growth through different welded joint regions was investigated, in terms of welded joint geometry and fatigue crack position. In the first phase of investigation, numerical simulation of crack growth in a welded joint made of steel P460NL1 was performed using extended Finite Element Methods (xFEM). Numerical models employed Paris law, using experimentally determined coefficients for each welded joint zone. Weld geometry was varied by using different heat affected zone (HAZ) widths, i.e. fatigue crack lengths. The second stage involved similar numerical models with different material (Protac 500). Fatigue lives for regions in both models were then compared.
T2  - International Journal of Fatigue
T1  - Welded joint geometry effect on fatigue crack growth resistance in different metallic materials
VL  - 150
DO  - 10.1016/j.ijfatigue.2021.106298
ER  - 

@article{
author = "Sedmak, Aleksandar and Hemer, Abubkr and Sedmak, Simon A. and Milović, Ljubica and Grbovic, Aleksandar and Cabrilo, Aleksandar and Kljajin, Milan",
year = "2021",
abstract = "Fatigue crack growth through different welded joint regions was investigated, in terms of welded joint geometry and fatigue crack position. In the first phase of investigation, numerical simulation of crack growth in a welded joint made of steel P460NL1 was performed using extended Finite Element Methods (xFEM). Numerical models employed Paris law, using experimentally determined coefficients for each welded joint zone. Weld geometry was varied by using different heat affected zone (HAZ) widths, i.e. fatigue crack lengths. The second stage involved similar numerical models with different material (Protac 500). Fatigue lives for regions in both models were then compared.",
journal = "International Journal of Fatigue",
title = "Welded joint geometry effect on fatigue crack growth resistance in different metallic materials",
volume = "150",
doi = "10.1016/j.ijfatigue.2021.106298"
}

Sedmak, A., Hemer, A., Sedmak, S. A., Milović, L., Grbovic, A., Cabrilo, A.,& Kljajin, M.. (2021). Welded joint geometry effect on fatigue crack growth resistance in different metallic materials. in International Journal of Fatigue, 150.
https://doi.org/10.1016/j.ijfatigue.2021.106298

Sedmak A, Hemer A, Sedmak SA, Milović L, Grbovic A, Cabrilo A, Kljajin M. Welded joint geometry effect on fatigue crack growth resistance in different metallic materials. in International Journal of Fatigue. 2021;150.
doi:10.1016/j.ijfatigue.2021.106298 .

Sedmak, Aleksandar, Hemer, Abubkr, Sedmak, Simon A., Milović, Ljubica, Grbovic, Aleksandar, Cabrilo, Aleksandar, Kljajin, Milan, "Welded joint geometry effect on fatigue crack growth resistance in different metallic materials" in International Journal of Fatigue, 150 (2021),
https://doi.org/10.1016/j.ijfatigue.2021.106298 . .

TY  - JOUR
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Sedmak, Aleksandar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4389
AB  - Fracture of welded joints has been an important research and industrial topic for a long time, having in mind the key role of welded joints in ensuring the safe operation and integrity of welded structures. This work contains an overview of application of micromechanical models to ductile fracture of welded joints. The main benefit of these models, in comparison with the classical fracture mechanics approach, is consideration of the local quantities (stress and strain) in prediction of damage development. The damage is quantified through the value of the damage parameter, which is typically related to the void nucleation, growth and coalescence for ductile fracture of metallic materials, i.e. the description of the material can be related to the actual material behaviour during fracture. Most of the presented studies, including those published by the present authors, are performed on steel as the base material, and the rest deal with aluminium alloys.
PB  - Srpsko društvo za mehaniku, Beograd
T2  - Theoretical and Applied Mechanics
T1  - An overview of application of micromechanical models in ductile fracture analysis of welded joints
EP  - 62
IS  - 1
SP  - 33
VL  - 47
DO  - 10.2298/TAM200117004R
ER  - 

@article{
author = "Rakin, Marko and Međo, Bojan and Gubeljak, Nenad and Sedmak, Aleksandar",
year = "2020",
abstract = "Fracture of welded joints has been an important research and industrial topic for a long time, having in mind the key role of welded joints in ensuring the safe operation and integrity of welded structures. This work contains an overview of application of micromechanical models to ductile fracture of welded joints. The main benefit of these models, in comparison with the classical fracture mechanics approach, is consideration of the local quantities (stress and strain) in prediction of damage development. The damage is quantified through the value of the damage parameter, which is typically related to the void nucleation, growth and coalescence for ductile fracture of metallic materials, i.e. the description of the material can be related to the actual material behaviour during fracture. Most of the presented studies, including those published by the present authors, are performed on steel as the base material, and the rest deal with aluminium alloys.",
publisher = "Srpsko društvo za mehaniku, Beograd",
journal = "Theoretical and Applied Mechanics",
title = "An overview of application of micromechanical models in ductile fracture analysis of welded joints",
pages = "62-33",
number = "1",
volume = "47",
doi = "10.2298/TAM200117004R"
}

Rakin, M., Međo, B., Gubeljak, N.,& Sedmak, A.. (2020). An overview of application of micromechanical models in ductile fracture analysis of welded joints. in Theoretical and Applied Mechanics
Srpsko društvo za mehaniku, Beograd., 47(1), 33-62.
https://doi.org/10.2298/TAM200117004R

Rakin M, Međo B, Gubeljak N, Sedmak A. An overview of application of micromechanical models in ductile fracture analysis of welded joints. in Theoretical and Applied Mechanics. 2020;47(1):33-62.
doi:10.2298/TAM200117004R .

Rakin, Marko, Međo, Bojan, Gubeljak, Nenad, Sedmak, Aleksandar, "An overview of application of micromechanical models in ductile fracture analysis of welded joints" in Theoretical and Applied Mechanics, 47, no. 1 (2020):33-62,
https://doi.org/10.2298/TAM200117004R . .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, D.
AU  - Lazić, V.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4560
AB  - Experimental investigation of the integrity of casing pipes, used in the oil drilling rigs, withdrawn after about 70,000 h of service, has been conducted, together with numerical simulation. Pipes were manufactured by the high frequency contact welding (HF) of API J55 steel. The influence of corrosion damage is investigated by means of pressure test of a pipe with different damage levels made by machining the circular holes. The finite element analysis of the damaged pipe subjected to internal pressure is conducted to simulate the stress state in the pipe and to establish the criteria for the maximum pressure that a damaged pipe can withstand. Several analytical expressions were used to estimate the maximum pressure in a damaged pipeline, and the solutions were compared to predictions of finite element models and experimental results.
T2  - International Journal of Pressure Vessels and Piping
T1  - Remaining strength of API J55 steel casing pipes damaged by corrosion
VL  - 188
DO  - 10.1016/j.ijpvp.2020.104230
ER  - 

@article{
author = "Sedmak, Aleksandar and Arsić, Miodrag and Šarkočević, Živče and Međo, Bojan and Rakin, Marko and Arsić, D. and Lazić, V.",
year = "2020",
abstract = "Experimental investigation of the integrity of casing pipes, used in the oil drilling rigs, withdrawn after about 70,000 h of service, has been conducted, together with numerical simulation. Pipes were manufactured by the high frequency contact welding (HF) of API J55 steel. The influence of corrosion damage is investigated by means of pressure test of a pipe with different damage levels made by machining the circular holes. The finite element analysis of the damaged pipe subjected to internal pressure is conducted to simulate the stress state in the pipe and to establish the criteria for the maximum pressure that a damaged pipe can withstand. Several analytical expressions were used to estimate the maximum pressure in a damaged pipeline, and the solutions were compared to predictions of finite element models and experimental results.",
journal = "International Journal of Pressure Vessels and Piping",
title = "Remaining strength of API J55 steel casing pipes damaged by corrosion",
volume = "188",
doi = "10.1016/j.ijpvp.2020.104230"
}

Sedmak, A., Arsić, M., Šarkočević, Ž., Međo, B., Rakin, M., Arsić, D.,& Lazić, V.. (2020). Remaining strength of API J55 steel casing pipes damaged by corrosion. in International Journal of Pressure Vessels and Piping, 188.
https://doi.org/10.1016/j.ijpvp.2020.104230

Sedmak A, Arsić M, Šarkočević Ž, Međo B, Rakin M, Arsić D, Lazić V. Remaining strength of API J55 steel casing pipes damaged by corrosion. in International Journal of Pressure Vessels and Piping. 2020;188.
doi:10.1016/j.ijpvp.2020.104230 .

Sedmak, Aleksandar, Arsić, Miodrag, Šarkočević, Živče, Međo, Bojan, Rakin, Marko, Arsić, D., Lazić, V., "Remaining strength of API J55 steel casing pipes damaged by corrosion" in International Journal of Pressure Vessels and Piping, 188 (2020),
https://doi.org/10.1016/j.ijpvp.2020.104230 . .

TY  - JOUR
AU  - Kirin, Snežana
AU  - Jeremić, Lazar
AU  - Sedmak, Aleksandar
AU  - Martić, Igor
AU  - Sedmak, Simon
AU  - Vucetić, Ivana
AU  - Golubović, Tamara
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4383
AB  - Risk based analysis of reverse hydro power plant penstock structural integrity is performed using fracture mechanics parameters. To assess its structural integrity, extensive testing of the full-scale prototype had been performed, including hydrostatic over-pressurizing, during the design phase. More recently, the Failure Assessment Diagram has been used to evaluate probability, whereas phenomenological analysis has been used to estimate consequence, in the scope of common risk estimation. It is shown that over-pressuring has potential detrimental effect on pipeline safety, i.e. structural integrity.
PB  - Gruppo Italiano Frattura, Cassino
T2  - Frattura Ed Integrita Strutturale
T1  - Risk based analysis of RHPP penstock structural integrity
EP  - 352
IS  - 53
SP  - 345
DO  - 10.3221/IGF-ESIS.53.27
ER  - 

@article{
author = "Kirin, Snežana and Jeremić, Lazar and Sedmak, Aleksandar and Martić, Igor and Sedmak, Simon and Vucetić, Ivana and Golubović, Tamara",
year = "2020",
abstract = "Risk based analysis of reverse hydro power plant penstock structural integrity is performed using fracture mechanics parameters. To assess its structural integrity, extensive testing of the full-scale prototype had been performed, including hydrostatic over-pressurizing, during the design phase. More recently, the Failure Assessment Diagram has been used to evaluate probability, whereas phenomenological analysis has been used to estimate consequence, in the scope of common risk estimation. It is shown that over-pressuring has potential detrimental effect on pipeline safety, i.e. structural integrity.",
publisher = "Gruppo Italiano Frattura, Cassino",
journal = "Frattura Ed Integrita Strutturale",
title = "Risk based analysis of RHPP penstock structural integrity",
pages = "352-345",
number = "53",
doi = "10.3221/IGF-ESIS.53.27"
}

Kirin, S., Jeremić, L., Sedmak, A., Martić, I., Sedmak, S., Vucetić, I.,& Golubović, T.. (2020). Risk based analysis of RHPP penstock structural integrity. in Frattura Ed Integrita Strutturale
Gruppo Italiano Frattura, Cassino.(53), 345-352.
https://doi.org/10.3221/IGF-ESIS.53.27

Kirin S, Jeremić L, Sedmak A, Martić I, Sedmak S, Vucetić I, Golubović T. Risk based analysis of RHPP penstock structural integrity. in Frattura Ed Integrita Strutturale. 2020;(53):345-352.
doi:10.3221/IGF-ESIS.53.27 .

Kirin, Snežana, Jeremić, Lazar, Sedmak, Aleksandar, Martić, Igor, Sedmak, Simon, Vucetić, Ivana, Golubović, Tamara, "Risk based analysis of RHPP penstock structural integrity" in Frattura Ed Integrita Strutturale, no. 53 (2020):345-352,
https://doi.org/10.3221/IGF-ESIS.53.27 . .

TY  - JOUR
AU  - Hemer, Abubkr M.
AU  - Sedmak, Simon A.
AU  - Milović, Ljubica
AU  - Grbovic, Aleksandar
AU  - Sedmak, Aleksandar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4753
AB  - Fatigue behaviour of welded joints is investigated, in terms of welded joint geometry and the fatigue crack position. It is based on previous work which involved numerical simulation of fatigue crack growth in a welded joint made of micro-alloyed, low-carbon pressure vessel steel P460NL1, with the main focus on fatigue crack growth rate through different welded joint regions. The goal here was to change the size of the heat affected zone, as the region in which the fatigue crack initiated, and to compare the results obtained for new crack length values with the original ones, obtained by creating numerical models based on experimental data. A number of models were created, some of which simulated the case with a bigger heat affected zone (and, consequently, a smaller crack length in the weld metal), and other which simulated the case with a smaller heat affected zone. Due to the micro-structural differences between these two welded joint regions, noticeable differences appeared in the numbers of cycles obtained for each zone with varying fatigue crack lengths, as well as in the total number of cycles for both zones through which the crack propagated.
T2  - 1st Virtual European Conference on Fracture - Vecf1
T1  - FEM simulation of welded joint geometry influence on fatigue crack growth resistance
EP  - 1832
SP  - 1827
VL  - 28
DO  - 10.1016/j.prostr.2020.11.005
ER  - 

@article{
author = "Hemer, Abubkr M. and Sedmak, Simon A. and Milović, Ljubica and Grbovic, Aleksandar and Sedmak, Aleksandar",
year = "2020",
abstract = "Fatigue behaviour of welded joints is investigated, in terms of welded joint geometry and the fatigue crack position. It is based on previous work which involved numerical simulation of fatigue crack growth in a welded joint made of micro-alloyed, low-carbon pressure vessel steel P460NL1, with the main focus on fatigue crack growth rate through different welded joint regions. The goal here was to change the size of the heat affected zone, as the region in which the fatigue crack initiated, and to compare the results obtained for new crack length values with the original ones, obtained by creating numerical models based on experimental data. A number of models were created, some of which simulated the case with a bigger heat affected zone (and, consequently, a smaller crack length in the weld metal), and other which simulated the case with a smaller heat affected zone. Due to the micro-structural differences between these two welded joint regions, noticeable differences appeared in the numbers of cycles obtained for each zone with varying fatigue crack lengths, as well as in the total number of cycles for both zones through which the crack propagated.",
journal = "1st Virtual European Conference on Fracture - Vecf1",
title = "FEM simulation of welded joint geometry influence on fatigue crack growth resistance",
pages = "1832-1827",
volume = "28",
doi = "10.1016/j.prostr.2020.11.005"
}

Hemer, A. M., Sedmak, S. A., Milović, L., Grbovic, A.,& Sedmak, A.. (2020). FEM simulation of welded joint geometry influence on fatigue crack growth resistance. in 1st Virtual European Conference on Fracture - Vecf1, 28, 1827-1832.
https://doi.org/10.1016/j.prostr.2020.11.005

Hemer AM, Sedmak SA, Milović L, Grbovic A, Sedmak A. FEM simulation of welded joint geometry influence on fatigue crack growth resistance. in 1st Virtual European Conference on Fracture - Vecf1. 2020;28:1827-1832.
doi:10.1016/j.prostr.2020.11.005 .

Hemer, Abubkr M., Sedmak, Simon A., Milović, Ljubica, Grbovic, Aleksandar, Sedmak, Aleksandar, "FEM simulation of welded joint geometry influence on fatigue crack growth resistance" in 1st Virtual European Conference on Fracture - Vecf1, 28 (2020):1827-1832,
https://doi.org/10.1016/j.prostr.2020.11.005 . .

TY  - JOUR
AU  - Rakin, Marko
AU  - Stahle, Per
AU  - Shlyannikov, Valery
AU  - Sedmak, Aleksandar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4468
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - Editorial: Effects in Fracture
VL  - 107
DO  - 10.1016/j.tafmec.2020.102530
ER  - 

@article{
author = "Rakin, Marko and Stahle, Per and Shlyannikov, Valery and Sedmak, Aleksandar",
year = "2020",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "Editorial: Effects in Fracture",
volume = "107",
doi = "10.1016/j.tafmec.2020.102530"
}

Rakin, M., Stahle, P., Shlyannikov, V.,& Sedmak, A.. (2020). Editorial: Effects in Fracture. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 107.
https://doi.org/10.1016/j.tafmec.2020.102530

Rakin M, Stahle P, Shlyannikov V, Sedmak A. Editorial: Effects in Fracture. in Theoretical and Applied Fracture Mechanics. 2020;107.
doi:10.1016/j.tafmec.2020.102530 .

Rakin, Marko, Stahle, Per, Shlyannikov, Valery, Sedmak, Aleksandar, "Editorial: Effects in Fracture" in Theoretical and Applied Fracture Mechanics, 107 (2020),
https://doi.org/10.1016/j.tafmec.2020.102530 . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4107
AB  - Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Temperature fields in linear stage of friction stir welding effect of different material properties
EP  - 3992
IS  - 6
SP  - 3985
VL  - 23
DO  - 10.2298/TSCI181015264V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Međo, Bojan and Mrdak, Mihailo and Sedmak, Aleksandar",
year = "2019",
abstract = "Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Temperature fields in linear stage of friction stir welding effect of different material properties",
pages = "3992-3985",
number = "6",
volume = "23",
doi = "10.2298/TSCI181015264V"
}

Veljić, D., Rakin, M., Međo, B., Mrdak, M.,& Sedmak, A.. (2019). Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(6), 3985-3992.
https://doi.org/10.2298/TSCI181015264V

Veljić D, Rakin M, Međo B, Mrdak M, Sedmak A. Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science. 2019;23(6):3985-3992.
doi:10.2298/TSCI181015264V .

Veljić, Darko, Rakin, Marko, Međo, Bojan, Mrdak, Mihailo, Sedmak, Aleksandar, "Temperature fields in linear stage of friction stir welding effect of different material properties" in Thermal Science, 23, no. 6 (2019):3985-3992,
https://doi.org/10.2298/TSCI181015264V . .

TY  - JOUR
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4055
AB  - The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens
VL  - 103
DO  - 10.1016/j.tafmec.2019.102302
ER  - 

@article{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2019",
abstract = "The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens",
volume = "103",
doi = "10.1016/j.tafmec.2019.102302"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2019). Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102302

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102302 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102302 . .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Younise, Bashir
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4085
AB  - Micromechanical modelling of ductile fracture by using the local approach has been presented as the review of previously obtained results for welded joints made of low alloyed high strength steel. Experimental work was performed on 3PB specimens and tensile panels, which were then modelled by finite element method, using two- and three-dimensional meshes, respectively. The local approach was used to simulate both for crack initiation and growth during ductile fracture process.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metallurgical & Materials Engineering
T1  - Micromechanical modelling of ductile fracture - local approach
EP  - 286
IS  - 4
SP  - 265
VL  - 25
DO  - 10.30544/459
ER  - 

@article{
author = "Sedmak, Aleksandar and Rakin, Marko and Međo, Bojan and Younise, Bashir",
year = "2019",
abstract = "Micromechanical modelling of ductile fracture by using the local approach has been presented as the review of previously obtained results for welded joints made of low alloyed high strength steel. Experimental work was performed on 3PB specimens and tensile panels, which were then modelled by finite element method, using two- and three-dimensional meshes, respectively. The local approach was used to simulate both for crack initiation and growth during ductile fracture process.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metallurgical & Materials Engineering",
title = "Micromechanical modelling of ductile fracture - local approach",
pages = "286-265",
number = "4",
volume = "25",
doi = "10.30544/459"
}

Sedmak, A., Rakin, M., Međo, B.,& Younise, B.. (2019). Micromechanical modelling of ductile fracture - local approach. in Metallurgical & Materials Engineering
Savez inženjera metalurgije Srbije, Beograd., 25(4), 265-286.
https://doi.org/10.30544/459

Sedmak A, Rakin M, Međo B, Younise B. Micromechanical modelling of ductile fracture - local approach. in Metallurgical & Materials Engineering. 2019;25(4):265-286.
doi:10.30544/459 .

Sedmak, Aleksandar, Rakin, Marko, Međo, Bojan, Younise, Bashir, "Micromechanical modelling of ductile fracture - local approach" in Metallurgical & Materials Engineering, 25, no. 4 (2019):265-286,
https://doi.org/10.30544/459 . .

TY  - JOUR
AU  - Mijatović, Tamara
AU  - Milovanović, Aleksa
AU  - Sedmak, Aleksandar
AU  - Milović, Ljubica
AU  - Čolić, Katarina
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4195
AB  - Total hip replacement implants are used as an artificial replacement for disfunctional hips in order to sustain joint movement. Chosen material and design of total hip replacement are the most influential factors for artificial joint utilization. Selected total hip replacement is obtained by precision casting method, made from Ti6Al4V ELI (Extra Low Interstitials) alloy. In order to acquire a geometrical model of chosen implant, the 3D scanner is used and an obtained point cloud (PC), then exploited for reverse engineering to a CAD model. The neck thickness of implant affects angle of movement of the joint and structural integrity. Reducing the thickness of the neck section results in higher movement of the joint, but inversely affects its structural integrity. The 3D scanned implant has a neck thickness of 14.6 mm, and data from literature suggest that the best movement angle is for 9 mm thickness of the implant. In order to redesign the available implant, five different models with a neck thickness between 9 and 14.6 mm are made. Obtained results show the thickness effects the stress distribution in a critical area.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant
EP  - 242
IS  - 3
SP  - 237
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4195
ER  - 

@article{
author = "Mijatović, Tamara and Milovanović, Aleksa and Sedmak, Aleksandar and Milović, Ljubica and Čolić, Katarina",
year = "2019",
abstract = "Total hip replacement implants are used as an artificial replacement for disfunctional hips in order to sustain joint movement. Chosen material and design of total hip replacement are the most influential factors for artificial joint utilization. Selected total hip replacement is obtained by precision casting method, made from Ti6Al4V ELI (Extra Low Interstitials) alloy. In order to acquire a geometrical model of chosen implant, the 3D scanner is used and an obtained point cloud (PC), then exploited for reverse engineering to a CAD model. The neck thickness of implant affects angle of movement of the joint and structural integrity. Reducing the thickness of the neck section results in higher movement of the joint, but inversely affects its structural integrity. The 3D scanned implant has a neck thickness of 14.6 mm, and data from literature suggest that the best movement angle is for 9 mm thickness of the implant. In order to redesign the available implant, five different models with a neck thickness between 9 and 14.6 mm are made. Obtained results show the thickness effects the stress distribution in a critical area.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant",
pages = "242-237",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4195"
}

Mijatović, T., Milovanović, A., Sedmak, A., Milović, L.,& Čolić, K.. (2019). Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 19(3), 237-242.
https://hdl.handle.net/21.15107/rcub_technorep_4195

Mijatović T, Milovanović A, Sedmak A, Milović L, Čolić K. Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant. in Structural Integrity and Life. 2019;19(3):237-242.
https://hdl.handle.net/21.15107/rcub_technorep_4195 .

Mijatović, Tamara, Milovanović, Aleksa, Sedmak, Aleksandar, Milović, Ljubica, Čolić, Katarina, "Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant" in Structural Integrity and Life, 19, no. 3 (2019):237-242,
https://hdl.handle.net/21.15107/rcub_technorep_4195 .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radaković, Zoran
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6015
T2  - Procedia Structural Integrity
T1  - Editorial
EP  - 2
SP  - 1
VL  - 13
DO  - 10.1016/j.prostr.2018.12.001
ER  - 

@article{
author = "Sedmak, Aleksandar and Rakin, Marko and Radaković, Zoran",
year = "2018",
journal = "Procedia Structural Integrity",
title = "Editorial",
pages = "2-1",
volume = "13",
doi = "10.1016/j.prostr.2018.12.001"
}

Sedmak, A., Rakin, M.,& Radaković, Z.. (2018). Editorial. in Procedia Structural Integrity, 13, 1-2.
https://doi.org/10.1016/j.prostr.2018.12.001

Sedmak A, Rakin M, Radaković Z. Editorial. in Procedia Structural Integrity. 2018;13:1-2.
doi:10.1016/j.prostr.2018.12.001 .

Sedmak, Aleksandar, Rakin, Marko, Radaković, Zoran, "Editorial" in Procedia Structural Integrity, 13 (2018):1-2,
https://doi.org/10.1016/j.prostr.2018.12.001 . .

TY  - JOUR
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3796
AB  - Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels.
PB  - Elsevier Science Bv, Amsterdam
T2  - ECF22 - Loading and Environmental Effects on Structural Integrity
T1  - Fracture analysis of axially flawed ring-shaped bending specimen
EP  - 1833
SP  - 1828
VL  - 13
DO  - 10.1016/j.prostr.2018.12.333
ER  - 

@article{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2018",
abstract = "Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "ECF22 - Loading and Environmental Effects on Structural Integrity",
title = "Fracture analysis of axially flawed ring-shaped bending specimen",
pages = "1833-1828",
volume = "13",
doi = "10.1016/j.prostr.2018.12.333"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2018). Fracture analysis of axially flawed ring-shaped bending specimen. in ECF22 - Loading and Environmental Effects on Structural Integrity
Elsevier Science Bv, Amsterdam., 13, 1828-1833.
https://doi.org/10.1016/j.prostr.2018.12.333

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture analysis of axially flawed ring-shaped bending specimen. in ECF22 - Loading and Environmental Effects on Structural Integrity. 2018;13:1828-1833.
doi:10.1016/j.prostr.2018.12.333 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture analysis of axially flawed ring-shaped bending specimen" in ECF22 - Loading and Environmental Effects on Structural Integrity, 13 (2018):1828-1833,
https://doi.org/10.1016/j.prostr.2018.12.333 . .

TY  - JOUR
AU  - Jeremić, Lazar
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Arandelović, Mihajlo
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3777
AB  - Presented is the effect of plasma hardfacing (or just hardfacing) and carbides presence on the occurrence of cracks and microcracks in the welded layer. The reasons behind this phenomenon are analysed and explained. In addition, the plasma welding technology with all the necessary data such as welding parameters is shown for the case of undamaged tooth of a machine used for the milling of marble. The welded layer with a significant amount of tungsten-carbide is applied onto new, undamaged tooth in order to improve the characteristics of the surface layer of the base material by increasing its hardness which leads to increasing of wear resistance and impact toughness. After welding, the tooth is cut using electrical discharge machining (EDM) for examining the applied surface layer in different locations throughout the welded joint. Macro and microstructural analysis aided in determining the characteristics of the surface layer. The nature and causes of cracks and microcracks are analysed in order to provide a better solution to avoid crack occurrence, as well as in determining their potential effect on the integrity of the tooth as a whole.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks
EP  - 103
IS  - 2
SP  - 99
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3777
ER  - 

@article{
author = "Jeremić, Lazar and Đorđević, Branislav and Sedmak, Simon and Sedmak, Aleksandar and Rakin, Marko and Arandelović, Mihajlo",
year = "2018",
abstract = "Presented is the effect of plasma hardfacing (or just hardfacing) and carbides presence on the occurrence of cracks and microcracks in the welded layer. The reasons behind this phenomenon are analysed and explained. In addition, the plasma welding technology with all the necessary data such as welding parameters is shown for the case of undamaged tooth of a machine used for the milling of marble. The welded layer with a significant amount of tungsten-carbide is applied onto new, undamaged tooth in order to improve the characteristics of the surface layer of the base material by increasing its hardness which leads to increasing of wear resistance and impact toughness. After welding, the tooth is cut using electrical discharge machining (EDM) for examining the applied surface layer in different locations throughout the welded joint. Macro and microstructural analysis aided in determining the characteristics of the surface layer. The nature and causes of cracks and microcracks are analysed in order to provide a better solution to avoid crack occurrence, as well as in determining their potential effect on the integrity of the tooth as a whole.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks",
pages = "103-99",
number = "2",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3777"
}

Jeremić, L., Đorđević, B., Sedmak, S., Sedmak, A., Rakin, M.,& Arandelović, M.. (2018). Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 18(2), 99-103.
https://hdl.handle.net/21.15107/rcub_technorep_3777

Jeremić L, Đorđević B, Sedmak S, Sedmak A, Rakin M, Arandelović M. Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks. in Structural Integrity and Life. 2018;18(2):99-103.
https://hdl.handle.net/21.15107/rcub_technorep_3777 .

Jeremić, Lazar, Đorđević, Branislav, Sedmak, Simon, Sedmak, Aleksandar, Rakin, Marko, Arandelović, Mihajlo, "Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks" in Structural Integrity and Life, 18, no. 2 (2018):99-103,
https://hdl.handle.net/21.15107/rcub_technorep_3777 .

TY  - JOUR
AU  - Musraty, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Likeb, A.
AU  - Cvijović-Alagić, Ivana
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3734
AB  - Integrity of pipes is typically assessed by testing fracture mechanics specimens, such as compact tensile (CT) or single-edge notched bending (SENB). However, for some pipe dimensions it is not easy or possible to fabricate a specimen conforming to the requirements of standard procedures. A new type of specimen is proposed recently, which can be advantageous for relatively small pipe diameters and axial defects - the pipe ring notch bend specimen - PRNB. In this work, criteria for failure by ductile fracture of PRNB specimens are determined experimentally and by application of micromechanical analysis. The influence of size of the specimen, as well as size and shape of the stress concentrator, is analysed. The results of this study, along with previous authors' results, lead to the conclusion that the pipe ring specimens can be applied in integrity assessment of pipes with defects. Also, the benefits of their application include much simpler fabrication and the same material history as the pipe itself.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Fracture Mechanics
T1  - Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis
EP  - 261
SP  - 247
VL  - 175
DO  - 10.1016/j.engfracmech.2017.01.022
ER  - 

@article{
author = "Musraty, Walid and Međo, Bojan and Gubeljak, Nenad and Likeb, A. and Cvijović-Alagić, Ivana and Sedmak, Aleksandar and Rakin, Marko",
year = "2017",
abstract = "Integrity of pipes is typically assessed by testing fracture mechanics specimens, such as compact tensile (CT) or single-edge notched bending (SENB). However, for some pipe dimensions it is not easy or possible to fabricate a specimen conforming to the requirements of standard procedures. A new type of specimen is proposed recently, which can be advantageous for relatively small pipe diameters and axial defects - the pipe ring notch bend specimen - PRNB. In this work, criteria for failure by ductile fracture of PRNB specimens are determined experimentally and by application of micromechanical analysis. The influence of size of the specimen, as well as size and shape of the stress concentrator, is analysed. The results of this study, along with previous authors' results, lead to the conclusion that the pipe ring specimens can be applied in integrity assessment of pipes with defects. Also, the benefits of their application include much simpler fabrication and the same material history as the pipe itself.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Fracture Mechanics",
title = "Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis",
pages = "261-247",
volume = "175",
doi = "10.1016/j.engfracmech.2017.01.022"
}

Musraty, W., Međo, B., Gubeljak, N., Likeb, A., Cvijović-Alagić, I., Sedmak, A.,& Rakin, M.. (2017). Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis. in Engineering Fracture Mechanics
Pergamon-Elsevier Science Ltd, Oxford., 175, 247-261.
https://doi.org/10.1016/j.engfracmech.2017.01.022

Musraty W, Međo B, Gubeljak N, Likeb A, Cvijović-Alagić I, Sedmak A, Rakin M. Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis. in Engineering Fracture Mechanics. 2017;175:247-261.
doi:10.1016/j.engfracmech.2017.01.022 .

Musraty, Walid, Međo, Bojan, Gubeljak, Nenad, Likeb, A., Cvijović-Alagić, Ivana, Sedmak, Aleksandar, Rakin, Marko, "Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis" in Engineering Fracture Mechanics, 175 (2017):247-261,
https://doi.org/10.1016/j.engfracmech.2017.01.022 . .

TY  - JOUR
AU  - Čolić, Katarina
AU  - Gubeljak, Nenad
AU  - Burzić, Meri
AU  - Sedmak, Aleksandar
AU  - Mijatović, Tamara
AU  - Milovanović, Aleksa
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5814
AB  - In this paper are presented experimental analyses of the behaviour of 316L stainless steel in regard to fracture, according to standard methods of investigation on modified tensile C(T) specimens. The S316L alloy is selected for this experimental analysis, often used in many engineering applications. This alloy is not prone to corrosion as other austenitic steels with a higher share of carbon. Results show that material behaviour, in terms of dependence of stress intensity factor (SIF) value relative to thickness of the plate, is necessary to assume with a different model when the specimen thickness is very small. Application of standards in the field of investigation of material resistance to fracture allow simultaneous determination and connection of several fracture mechanics parameters.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Analysis of fracture behaviour of thin s316l stainless steel plates
EP  - 216
IS  - 3
SP  - 211
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2732
ER  - 

@article{
author = "Čolić, Katarina and Gubeljak, Nenad and Burzić, Meri and Sedmak, Aleksandar and Mijatović, Tamara and Milovanović, Aleksa",
year = "2017",
abstract = "In this paper are presented experimental analyses of the behaviour of 316L stainless steel in regard to fracture, according to standard methods of investigation on modified tensile C(T) specimens. The S316L alloy is selected for this experimental analysis, often used in many engineering applications. This alloy is not prone to corrosion as other austenitic steels with a higher share of carbon. Results show that material behaviour, in terms of dependence of stress intensity factor (SIF) value relative to thickness of the plate, is necessary to assume with a different model when the specimen thickness is very small. Application of standards in the field of investigation of material resistance to fracture allow simultaneous determination and connection of several fracture mechanics parameters.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Analysis of fracture behaviour of thin s316l stainless steel plates",
pages = "216-211",
number = "3",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2732"
}

Čolić, K., Gubeljak, N., Burzić, M., Sedmak, A., Mijatović, T.,& Milovanović, A.. (2017). Analysis of fracture behaviour of thin s316l stainless steel plates. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(3), 211-216.
https://hdl.handle.net/21.15107/rcub_machinery_2732

Čolić K, Gubeljak N, Burzić M, Sedmak A, Mijatović T, Milovanović A. Analysis of fracture behaviour of thin s316l stainless steel plates. in Structural Integrity and Life. 2017;17(3):211-216.
https://hdl.handle.net/21.15107/rcub_machinery_2732 .

Čolić, Katarina, Gubeljak, Nenad, Burzić, Meri, Sedmak, Aleksandar, Mijatović, Tamara, Milovanović, Aleksa, "Analysis of fracture behaviour of thin s316l stainless steel plates" in Structural Integrity and Life, 17, no. 3 (2017):211-216,
https://hdl.handle.net/21.15107/rcub_machinery_2732 .

TY  - CONF
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
AU  - Swei, M.
AU  - Milović, Ljubica
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3484
AB  - The deformation and crack growth behaviour of P22 and P91 steel weldments tested at 550 °C and 600 °C, respectively,compact C(T) type specimens with sharp EDM starter notches in the base metal (BM) and heat affected zone (HAZ) were tested.The test procedures are detailed and followed in ASTM E1457.00, the crack growth data are interpreted using the fracture mechanics parameter C*. The initial crack is located within the HAZ of the weldments for both steel types, comparison of results show large similarity of both steels behaviour and the crack growth rates for the crack located within the HAZ are higher than with BM values.
PB  - 14th International Conference on Fracture, ICF 2017
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - Creep crack growth - Comparison of two steel P91 and P22
EP  - 874
SP  - 873
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3484
ER  - 

@conference{
author = "Petrovski, Blagoj and Sedmak, Aleksandar and Swei, M. and Milović, Ljubica",
year = "2017",
abstract = "The deformation and crack growth behaviour of P22 and P91 steel weldments tested at 550 °C and 600 °C, respectively,compact C(T) type specimens with sharp EDM starter notches in the base metal (BM) and heat affected zone (HAZ) were tested.The test procedures are detailed and followed in ASTM E1457.00, the crack growth data are interpreted using the fracture mechanics parameter C*. The initial crack is located within the HAZ of the weldments for both steel types, comparison of results show large similarity of both steels behaviour and the crack growth rates for the crack located within the HAZ are higher than with BM values.",
publisher = "14th International Conference on Fracture, ICF 2017",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "Creep crack growth - Comparison of two steel P91 and P22",
pages = "874-873",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3484"
}

Petrovski, B., Sedmak, A., Swei, M.,& Milović, L.. (2017). Creep crack growth - Comparison of two steel P91 and P22. in ICF 2017 - 14th International Conference on Fracture
14th International Conference on Fracture, ICF 2017., 2, 873-874.
https://hdl.handle.net/21.15107/rcub_technorep_3484

Petrovski B, Sedmak A, Swei M, Milović L. Creep crack growth - Comparison of two steel P91 and P22. in ICF 2017 - 14th International Conference on Fracture. 2017;2:873-874.
https://hdl.handle.net/21.15107/rcub_technorep_3484 .

Petrovski, Blagoj, Sedmak, Aleksandar, Swei, M., Milović, Ljubica, "Creep crack growth - Comparison of two steel P91 and P22" in ICF 2017 - 14th International Conference on Fracture, 2 (2017):873-874,
https://hdl.handle.net/21.15107/rcub_technorep_3484 .

TY  - CONF
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Musraty, Walid
AU  - Matvienko, Y.
AU  - Milošević, M.
AU  - Sedmak, Aleksandar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3483
AB  - Integrity of cylindrical structures, such as pipes and small-scale pressure vessels, is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, their fabrication is mainly not possible for thin-walled pressurised elements, commonly used in structures of process and energetic facilities, such as hydrogen and hydrogen carriers storage and delivery systems. Recently proposed nonstandard ring-shaped specimen is used to test the fracture resistance of pressurised cylinders with defects (cracks or notches) in the most critical direction - axial. Some of the advantages of the pipe-ring notch bend specimen, PRNB, are simple fabrication and same material history as actual exploited structure. A combined experimental-numerical procedure is applied for prediction of fracture behaviour of specimens (applicable to ductile metals, mainly steels and Al alloys), with the aim to further validate the new specimen. The results obtained so far lead to conclusion that PRNB specimen can be applied in integrity assessment of cylindrical structures.
PB  - 14th International Conference on Fracture, ICF 2017
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures
EP  - 220
SP  - 219
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3483
ER  - 

@conference{
author = "Međo, Bojan and Rakin, Marko and Gubeljak, Nenad and Musraty, Walid and Matvienko, Y. and Milošević, M. and Sedmak, Aleksandar",
year = "2017",
abstract = "Integrity of cylindrical structures, such as pipes and small-scale pressure vessels, is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, their fabrication is mainly not possible for thin-walled pressurised elements, commonly used in structures of process and energetic facilities, such as hydrogen and hydrogen carriers storage and delivery systems. Recently proposed nonstandard ring-shaped specimen is used to test the fracture resistance of pressurised cylinders with defects (cracks or notches) in the most critical direction - axial. Some of the advantages of the pipe-ring notch bend specimen, PRNB, are simple fabrication and same material history as actual exploited structure. A combined experimental-numerical procedure is applied for prediction of fracture behaviour of specimens (applicable to ductile metals, mainly steels and Al alloys), with the aim to further validate the new specimen. The results obtained so far lead to conclusion that PRNB specimen can be applied in integrity assessment of cylindrical structures.",
publisher = "14th International Conference on Fracture, ICF 2017",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures",
pages = "220-219",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3483"
}

Međo, B., Rakin, M., Gubeljak, N., Musraty, W., Matvienko, Y., Milošević, M.,& Sedmak, A.. (2017). Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures. in ICF 2017 - 14th International Conference on Fracture
14th International Conference on Fracture, ICF 2017., 2, 219-220.
https://hdl.handle.net/21.15107/rcub_technorep_3483

Međo B, Rakin M, Gubeljak N, Musraty W, Matvienko Y, Milošević M, Sedmak A. Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures. in ICF 2017 - 14th International Conference on Fracture. 2017;2:219-220.
https://hdl.handle.net/21.15107/rcub_technorep_3483 .

Međo, Bojan, Rakin, Marko, Gubeljak, Nenad, Musraty, Walid, Matvienko, Y., Milošević, M., Sedmak, Aleksandar, "Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures" in ICF 2017 - 14th International Conference on Fracture, 2 (2017):219-220,
https://hdl.handle.net/21.15107/rcub_technorep_3483 .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3635
AB  - The topic of this work is assessment of ductile fracture initiation and development in different zones of welded joint of a high strength low alloyed (HSLA) steel. A combined experimental-numerical procedure is applied for determination of properties of the weld metal and the heat affected zone - HAZ. One tensile specimen with rectangular cross-section is tested, and the surface strains are determined using stereometric 3D measurement (measurement system Gom Aramis with two cameras and software solution). This methodology enabled formation of the stress-strain curves for micromechanical analysis of fracture of specimens with initial fatigue pre-cracks. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. The cracks were positioned either in weld metal or in HAZ - within the fine-grained part. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied for assessment of crack growth onset and stable growth. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment
EP  - 445
SP  - 435
VL  - 82
DO  - 10.1016/j.engfailanal.2017.08.006
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Sedmak, Aleksandar",
year = "2017",
abstract = "The topic of this work is assessment of ductile fracture initiation and development in different zones of welded joint of a high strength low alloyed (HSLA) steel. A combined experimental-numerical procedure is applied for determination of properties of the weld metal and the heat affected zone - HAZ. One tensile specimen with rectangular cross-section is tested, and the surface strains are determined using stereometric 3D measurement (measurement system Gom Aramis with two cameras and software solution). This methodology enabled formation of the stress-strain curves for micromechanical analysis of fracture of specimens with initial fatigue pre-cracks. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. The cracks were positioned either in weld metal or in HAZ - within the fine-grained part. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied for assessment of crack growth onset and stable growth. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment",
pages = "445-435",
volume = "82",
doi = "10.1016/j.engfailanal.2017.08.006"
}

Younise, B., Rakin, M., Gubeljak, N., Međo, B.,& Sedmak, A.. (2017). Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 82, 435-445.
https://doi.org/10.1016/j.engfailanal.2017.08.006

Younise B, Rakin M, Gubeljak N, Međo B, Sedmak A. Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment. in Engineering Failure Analysis. 2017;82:435-445.
doi:10.1016/j.engfailanal.2017.08.006 .

Younise, Bashir, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Sedmak, Aleksandar, "Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment" in Engineering Failure Analysis, 82 (2017):435-445,
https://doi.org/10.1016/j.engfailanal.2017.08.006 . .

TY  - CONF
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6175
PB  - Matematicki institut SANU
C3  - International Mini-Symposium “Fracture Mechanics and Numerical Methods“
T1  - Micromechanical criteria for ductile fracture initiation in welded steel joints
EP  - 40
SP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6175
ER  - 

@conference{
author = "Rakin, Marko and Međo, Bojan and Sedmak, Aleksandar",
year = "2016",
publisher = "Matematicki institut SANU",
journal = "International Mini-Symposium “Fracture Mechanics and Numerical Methods“",
title = "Micromechanical criteria for ductile fracture initiation in welded steel joints",
pages = "40-39",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6175"
}

Rakin, M., Međo, B.,& Sedmak, A.. (2016). Micromechanical criteria for ductile fracture initiation in welded steel joints. in International Mini-Symposium “Fracture Mechanics and Numerical Methods“
Matematicki institut SANU., 39-40.
https://hdl.handle.net/21.15107/rcub_technorep_6175

Rakin M, Međo B, Sedmak A. Micromechanical criteria for ductile fracture initiation in welded steel joints. in International Mini-Symposium “Fracture Mechanics and Numerical Methods“. 2016;:39-40.
https://hdl.handle.net/21.15107/rcub_technorep_6175 .

Rakin, Marko, Međo, Bojan, Sedmak, Aleksandar, "Micromechanical criteria for ductile fracture initiation in welded steel joints" in International Mini-Symposium “Fracture Mechanics and Numerical Methods“ (2016):39-40,
https://hdl.handle.net/21.15107/rcub_technorep_6175 .

TY  - JOUR
AU  - Murariu, Alin
AU  - Veljić, Darko
AU  - Barjaktarević, Dragana
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Sedmak, Aleksandar
AU  - Đoković, Jelena M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3303
AB  - The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Influence of material velocity on heat generation during linear welding stage of friction stir welding
EP  - 1701
IS  - 5
SP  - 1693
VL  - 20
DO  - 10.2298/TSCI150904217M
ER  - 

@article{
author = "Murariu, Alin and Veljić, Darko and Barjaktarević, Dragana and Rakin, Marko and Radović, Nenad and Sedmak, Aleksandar and Đoković, Jelena M.",
year = "2016",
abstract = "The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Influence of material velocity on heat generation during linear welding stage of friction stir welding",
pages = "1701-1693",
number = "5",
volume = "20",
doi = "10.2298/TSCI150904217M"
}

Murariu, A., Veljić, D., Barjaktarević, D., Rakin, M., Radović, N., Sedmak, A.,& Đoković, J. M.. (2016). Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(5), 1693-1701.
https://doi.org/10.2298/TSCI150904217M

Murariu A, Veljić D, Barjaktarević D, Rakin M, Radović N, Sedmak A, Đoković JM. Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science. 2016;20(5):1693-1701.
doi:10.2298/TSCI150904217M .

Murariu, Alin, Veljić, Darko, Barjaktarević, Dragana, Rakin, Marko, Radović, Nenad, Sedmak, Aleksandar, Đoković, Jelena M., "Influence of material velocity on heat generation during linear welding stage of friction stir welding" in Thermal Science, 20, no. 5 (2016):1693-1701,
https://doi.org/10.2298/TSCI150904217M . .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3295
AB  - This study deals with the numerical prediction of ductile fracture initiation and development in welded joints of a high strength low alloyed steel. Having in mind the material heterogeneity in the joint zone, a combined experimental-numerical procedure is applied for determination of properties of the weld metal and heat affected zone - HAZ (both coarse-grained and fine-grained portion). Single smooth tensile specimen is tested, and the surface strains are determined during this test using stereometric measurement. Combined with numerical analysis, this enabled determination of stress-strain curves, which are subsequently used in numerical analysis of fracture of pre-cracked specimens. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. In each of them, the crack is positioned either in weld metal or between the coarse-grained and fine-grained HAZ. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied in numerical analysis. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.
PB  - Elsevier Science Bv, Amsterdam
T2  - 21st European Conference on Fracture, (ECF21)
T1  - Numerical prediction of ductile fracture resistance of welded joint zones
EP  - 760
SP  - 753
VL  - 2
DO  - 10.1016/j.prostr.2016.06.097
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Sedmak, Aleksandar",
year = "2016",
abstract = "This study deals with the numerical prediction of ductile fracture initiation and development in welded joints of a high strength low alloyed steel. Having in mind the material heterogeneity in the joint zone, a combined experimental-numerical procedure is applied for determination of properties of the weld metal and heat affected zone - HAZ (both coarse-grained and fine-grained portion). Single smooth tensile specimen is tested, and the surface strains are determined during this test using stereometric measurement. Combined with numerical analysis, this enabled determination of stress-strain curves, which are subsequently used in numerical analysis of fracture of pre-cracked specimens. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. In each of them, the crack is positioned either in weld metal or between the coarse-grained and fine-grained HAZ. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied in numerical analysis. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "21st European Conference on Fracture, (ECF21)",
title = "Numerical prediction of ductile fracture resistance of welded joint zones",
pages = "760-753",
volume = "2",
doi = "10.1016/j.prostr.2016.06.097"
}

Younise, B., Rakin, M., Gubeljak, N., Međo, B.,& Sedmak, A.. (2016). Numerical prediction of ductile fracture resistance of welded joint zones. in 21st European Conference on Fracture, (ECF21)
Elsevier Science Bv, Amsterdam., 2, 753-760.
https://doi.org/10.1016/j.prostr.2016.06.097

Younise B, Rakin M, Gubeljak N, Međo B, Sedmak A. Numerical prediction of ductile fracture resistance of welded joint zones. in 21st European Conference on Fracture, (ECF21). 2016;2:753-760.
doi:10.1016/j.prostr.2016.06.097 .

Younise, Bashir, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Sedmak, Aleksandar, "Numerical prediction of ductile fracture resistance of welded joint zones" in 21st European Conference on Fracture, (ECF21), 2 (2016):753-760,
https://doi.org/10.1016/j.prostr.2016.06.097 . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Popović, Negica
AU  - Daşcău, Horia
AU  - Bajić, Nikola
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2893
AB  - U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu.
AB  - In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.
PB  - Society for Structural Integrity and Life (DIVK)
T2  - Structural Integrity and Life
T1  - Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu
T1  - Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety
EP  - 116
IS  - 2
SP  - 111
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2893
ER  - 

@article{
author = "Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko and Radović, Nenad and Popović, Negica and Daşcău, Horia and Bajić, Nikola",
year = "2015",
abstract = "U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu., In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.",
publisher = "Society for Structural Integrity and Life (DIVK)",
journal = "Structural Integrity and Life",
title = "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu, Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety",
pages = "116-111",
number = "2",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2893"
}

Veljić, D., Sedmak, A., Rakin, M., Radović, N., Popović, N., Daşcău, H.,& Bajić, N.. (2015). Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life
Society for Structural Integrity and Life (DIVK)., 15(2), 111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893

Veljić D, Sedmak A, Rakin M, Radović N, Popović N, Daşcău H, Bajić N. Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life. 2015;15(2):111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893 .

Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, Radović, Nenad, Popović, Negica, Daşcău, Horia, Bajić, Nikola, "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu" in Structural Integrity and Life, 15, no. 2 (2015):111-116,
https://hdl.handle.net/21.15107/rcub_technorep_2893 .