TY  - CONF
AU  - Doncheva, Elisaveta
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Sedmak, Simon
AU  - Trajanoska, Bojana
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2942
AB  - The industrial application of high-strength low-alloyed steel (HSLA) in welded structures has increased the demand for understanding fracture behavior and structural integrity assessment of this type of steel and produced welded joints. The aim of this paper is to simulate the experimental evaluation of the fracture mechanics specimens by using the micromechanical model. The investigation is performed on two standard single edge notch bend (SENB) specimens with imposed crack in the central region. Numerical analysis was carried out by using Simulia Abaqus software package on 2D models used to simulate the damage development on the local level. The comparison between numerical and experimental results is presented through measured values of J-integral, load-line displacement vu and crack growth resistance (J-Aa) curves. This paper shows that numerical simulations are promising in respect to their accuracy. The application of this model enables to decrease the amount of expensive experiments for determination of the load level that causes crack propagation.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Numerical simulation of crack propagation in high-strength low-alloyed welded steel
EP  - 488
SP  - 483
VL  - 13
DO  - 10.1016/j.prostr.2018.12.080
ER  - 

@conference{
author = "Doncheva, Elisaveta and Međo, Bojan and Rakin, Marko and Sedmak, Simon and Trajanoska, Bojana",
year = "2018",
abstract = "The industrial application of high-strength low-alloyed steel (HSLA) in welded structures has increased the demand for understanding fracture behavior and structural integrity assessment of this type of steel and produced welded joints. The aim of this paper is to simulate the experimental evaluation of the fracture mechanics specimens by using the micromechanical model. The investigation is performed on two standard single edge notch bend (SENB) specimens with imposed crack in the central region. Numerical analysis was carried out by using Simulia Abaqus software package on 2D models used to simulate the damage development on the local level. The comparison between numerical and experimental results is presented through measured values of J-integral, load-line displacement vu and crack growth resistance (J-Aa) curves. This paper shows that numerical simulations are promising in respect to their accuracy. The application of this model enables to decrease the amount of expensive experiments for determination of the load level that causes crack propagation.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Numerical simulation of crack propagation in high-strength low-alloyed welded steel",
pages = "488-483",
volume = "13",
doi = "10.1016/j.prostr.2018.12.080"
}

Doncheva, E., Međo, B., Rakin, M., Sedmak, S.,& Trajanoska, B.. (2018). Numerical simulation of crack propagation in high-strength low-alloyed welded steel. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 483-488.
https://doi.org/10.1016/j.prostr.2018.12.080

Doncheva E, Međo B, Rakin M, Sedmak S, Trajanoska B. Numerical simulation of crack propagation in high-strength low-alloyed welded steel. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:483-488.
doi:10.1016/j.prostr.2018.12.080 .

Doncheva, Elisaveta, Međo, Bojan, Rakin, Marko, Sedmak, Simon, Trajanoska, Bojana, "Numerical simulation of crack propagation in high-strength low-alloyed welded steel" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):483-488,
https://doi.org/10.1016/j.prostr.2018.12.080 . .

TY  - JOUR
AU  - Sghayer, Abulgasem
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Dinulović, Mirko
AU  - Doncheva, Elisaveta
AU  - Petrovski, Blagoj
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2711
AB  - Fatigue life of integral skin-stringer panels produced by laser beam welding (LBW) is analysed. This type of panel is used in airframe construction where fatigue and damage tolerance are of paramount importance, since aircrafts must be designed to tolerate relatively large fatigue cracks. The analysed integral skin-stringer panel is made of AL-AA 6156T6/2.8 mm, where stringers are laser beam welded to the airframe skin. By using the extended finite element method (XFEM), fatigue life of simple flat plate, as well of the skin-stringer panel, are numerically simulated in order to investigate the effect of stringers.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Fatigue life analysis of the integral skin-stringer panel using xfem
EP  - 10
IS  - 1
SP  - 7
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2711
ER  - 

@article{
author = "Sghayer, Abulgasem and Grbović, Aleksandar and Sedmak, Aleksandar and Dinulović, Mirko and Doncheva, Elisaveta and Petrovski, Blagoj",
year = "2017",
abstract = "Fatigue life of integral skin-stringer panels produced by laser beam welding (LBW) is analysed. This type of panel is used in airframe construction where fatigue and damage tolerance are of paramount importance, since aircrafts must be designed to tolerate relatively large fatigue cracks. The analysed integral skin-stringer panel is made of AL-AA 6156T6/2.8 mm, where stringers are laser beam welded to the airframe skin. By using the extended finite element method (XFEM), fatigue life of simple flat plate, as well of the skin-stringer panel, are numerically simulated in order to investigate the effect of stringers.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Fatigue life analysis of the integral skin-stringer panel using xfem",
pages = "10-7",
number = "1",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2711"
}

Sghayer, A., Grbović, A., Sedmak, A., Dinulović, M., Doncheva, E.,& Petrovski, B.. (2017). Fatigue life analysis of the integral skin-stringer panel using xfem. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(1), 7-10.
https://hdl.handle.net/21.15107/rcub_machinery_2711

Sghayer A, Grbović A, Sedmak A, Dinulović M, Doncheva E, Petrovski B. Fatigue life analysis of the integral skin-stringer panel using xfem. in Structural Integrity and Life. 2017;17(1):7-10.
https://hdl.handle.net/21.15107/rcub_machinery_2711 .

Sghayer, Abulgasem, Grbović, Aleksandar, Sedmak, Aleksandar, Dinulović, Mirko, Doncheva, Elisaveta, Petrovski, Blagoj, "Fatigue life analysis of the integral skin-stringer panel using xfem" in Structural Integrity and Life, 17, no. 1 (2017):7-10,
https://hdl.handle.net/21.15107/rcub_machinery_2711 .

TY  - JOUR
AU  - Doncheva, Elisaveta
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2168
AB  - This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel
EP  - 134
IS  - 3
SP  - 131
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2937
ER  - 

@article{
author = "Doncheva, Elisaveta and Međo, Bojan and Sedmak, Aleksandar",
year = "2015",
abstract = "This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel",
pages = "134-131",
number = "3",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2937"
}

Doncheva, E., Međo, B.,& Sedmak, A.. (2015). Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 15(3), 131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937

Doncheva E, Međo B, Sedmak A. Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Structural Integrity and Life. 2015;15(3):131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

Doncheva, Elisaveta, Međo, Bojan, Sedmak, Aleksandar, "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel" in Structural Integrity and Life, 15, no. 3 (2015):131-134,
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

TY  - JOUR
AU  - Doncheva, Elisaveta
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2167
AB  - The paper presents a numerical analysis of stress distribution in micromechanical models in order to simulate microstructural mechanisms of microcrack initiation and propagation in polycrystalline metals. The analysis is based on plane-strain finite element crystal elasticity models. The microstructure is generated using Voronoi tessellation, encompassing random crystallographic orientation and position of grains that have different shapes and sizes. Since the correlation between the physical mechanisms of deformation and the microstructure is essential for sound understanding of crack initiation and propagation, the paper considers development of microstructural models of behaviour of anisotropic linear-elastic and elastic-plastic polycrystalline metals. The results indicate that the key factor for good agreement with the data obtained from polycrystalline microstructure, is the correct and proper interpretation of material heterogeneity between grains. The attention should be placed on proper material characterization, crystallographic slip mechanism representation and orientation.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Numerical analysis of stress distribution in polycrystalline microstructure
EP  - 43
IS  - 1
SP  - 39
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2167
ER  - 

@article{
author = "Doncheva, Elisaveta and Sedmak, Aleksandar",
year = "2015",
abstract = "The paper presents a numerical analysis of stress distribution in micromechanical models in order to simulate microstructural mechanisms of microcrack initiation and propagation in polycrystalline metals. The analysis is based on plane-strain finite element crystal elasticity models. The microstructure is generated using Voronoi tessellation, encompassing random crystallographic orientation and position of grains that have different shapes and sizes. Since the correlation between the physical mechanisms of deformation and the microstructure is essential for sound understanding of crack initiation and propagation, the paper considers development of microstructural models of behaviour of anisotropic linear-elastic and elastic-plastic polycrystalline metals. The results indicate that the key factor for good agreement with the data obtained from polycrystalline microstructure, is the correct and proper interpretation of material heterogeneity between grains. The attention should be placed on proper material characterization, crystallographic slip mechanism representation and orientation.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Numerical analysis of stress distribution in polycrystalline microstructure",
pages = "43-39",
number = "1",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2167"
}

Doncheva, E.,& Sedmak, A.. (2015). Numerical analysis of stress distribution in polycrystalline microstructure. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 15(1), 39-43.
https://hdl.handle.net/21.15107/rcub_machinery_2167

Doncheva E, Sedmak A. Numerical analysis of stress distribution in polycrystalline microstructure. in Structural Integrity and Life. 2015;15(1):39-43.
https://hdl.handle.net/21.15107/rcub_machinery_2167 .

Doncheva, Elisaveta, Sedmak, Aleksandar, "Numerical analysis of stress distribution in polycrystalline microstructure" in Structural Integrity and Life, 15, no. 1 (2015):39-43,
https://hdl.handle.net/21.15107/rcub_machinery_2167 .