TY  - THES
AU  - Kraedegh, Abubakr
PY  - 2018
UR  - https://nardus.mpn.gov.rs/handle/123456789/9613
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6519
AB  - In this present work, application of fracture mechanics is used to present a fatigue crack initiation and growth of friction stir welded (FSW) T joint plate made of aluminum alloy AA2024 –T351. All analyzed models are made from aluminum alloy 2024-T351.The properties of materials in the areas of joints and geometry measures of FSW joint are adopted from available experiments.
The effect of crack growth on fatigue life of unstiffened and stiffened structures is considered by using the numerical method based on finite elements - extended Finite Element Method (XFEM). ABAQUS software and Morfeo are used to display the results of the growth of cracks in welded T joint plates of FSW in all regions. Three point – bending load is applied, with stress intensity ratio R = 0. Tension fatigue load is also applied with different stress ratio of R = (0.5, 0, and -1)
All analyzed models are made from aluminum alloy 2024-T351. Material properties in joints zones and geometry mesures of FSW joint are adopted from available experiments. Following examples are analyzed:
- Example 1 Finite element modelling of butt welded joint under static pure Three - Point Bending Load
- Example 2 Finite element modelling of T welded joint under static pure Three - Point Bending Load
- Effect of stiffeners on fatigue crack propagation of welded plate
- Example 1 Finite element modelling of butt welded joint under static tensile loading
- Example 2 Finite element modelling of T welded joint under static tensile loading
- Example 3 Finite element modelling of double T welded joint under static tensile loading
- Effect of stress ratio on fatigue crack propagation of double T welded joint plate under static tensile loading
- Example 1 Stress ratio of 0.5
- Example 2 Stress ratio of 0
- Example 3 Stress ratio of -1
- Experimental Validation of Numerical Results of friction stir welded T-joints
Following results are obtain
- Numerical computations:
- Points coordinates of crack front x, y, z for every progression step,
- Distributions of stress intensity factors- KI along crack front for each progressions step,
- Fatigue life in form of applied load number change - N for each step of propagation.
- Fatigue crack growth rates are plotted versus the distribution of stress intensity factors – KI.
- Experimental Validation of Numerical Results of friction stir welded T-joints is analysed with the following:
- Fatigue life in form of applied load number change - N for each step of propagation.
AB  - U ovom radu su prikazani inicijacija i rast prsline u T spoju ploče od aluminijumske legure AA2024 –T351, zavarenom mešanjem trenjem (Friction Stir Welding - FSW), primenom mehanike loma. Svi analizirani modeli su napravljeni od legure 2024-A351. Osobine materijala i dimenzije u oblasti FSW spoja su usvojene na osnovu dostupnih eksperimenata.
Uticaj rasta prsline na zamorni vek neukrućenih i ukrućenih konstrukcija je razmatran primenom numeričkih metoda zasnovanih na analizi konačnim elementima – proširenoj metodi konačnih elemenata (PMKE). Korišćeni su softverski paketi ABAQUS i Morfeo za prikaz rezultata rasta prsline u svim oblastima T spojevia ploča zavarenih mešanjem trenjem. Urađeno je ispitivanje savijanja u tri tačke, sa odnosom napona R = 0. Takođe je zadato i zatezno zamorno opterećenje za različite odnose napona (0.5, 0 i -1).
Svi analizirani modeli su napravljeni od legure 2024-A351. Osobine materijala i dimenzije u oblasti FSW spoja su usvojene na osnovu dostupnih eksperimenata. Analizirani su sledeći primeri:
- Primer 1 Modeliranje konačnim elementima sučeonog zavarenog spoja pod čistim statičkim savijanjem u tri tačke
- Primer 2 Modeliranje konačnim elementima T zavarenog spoja pod čistim statičkkim savijanjem u tri tačke
- Uticaji ukrućenja na napredovanje zamorne prsline zavarene ploče
- Primer 1 Modeliranje konačnim elementima sučeonog spoja pod statičkim zateznim opterećenjem
- Primer 2 Modeliranje konačnim elementima T zavarenog spoja pod statičkim zateznim opterećenjem
- Primer 3 Modeliranje konačnim elementima dvostrukog T spoja pod statićkim zateznim opterećenjem
- Uticaj odnosa napona na napredovanje zamorne prsline u dvostrukom T zavarenom spoju pod statičkim zateznim opterećenjem
- Primer 1 Odnos napona 0.5
- Primer 2 Odnos napona 0
- Primer 3 Odnos napona -1
- Eksperimentalna verifikacija numeričkih rezultata dobijenih za T spojeve zavarene mešanjem trenjem
Dobijeni su sledeći rezultati
- Numerički proračuni:
- Koordinate x, y i z za vrh prsline u svakom koraku,
- Raspodele faktora intenziteta napona – KI duž fronta prsline u svakom koraku,
- Zamorni vek izražen preko broja promena primenjenog opterećenja – N za svaki korak napredovanja prsline.
- Brzine rasta zamorne prsline su prikazane u odnosu na raspodelu faktora intenziteta napona – KI.
- Eksperimentalna verifikacija numeričkih rezultata ispitivanja T spojeva zavarenih mešanjem trenjem, uključujući i:
- Zamorni vek izražen preko broja promena primenjenog opterećenja – N za svaki korak.
T2  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Fatigue crack growth in T welded joint of aluminium alloy
T1  - Rast zamorne prsline u T zavarenom spoju legure aluminijuma
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6519
ER  - 

@phdthesis{
author = "Kraedegh, Abubakr",
year = "2018",
abstract = "In this present work, application of fracture mechanics is used to present a fatigue crack initiation and growth of friction stir welded (FSW) T joint plate made of aluminum alloy AA2024 –T351. All analyzed models are made from aluminum alloy 2024-T351.The properties of materials in the areas of joints and geometry measures of FSW joint are adopted from available experiments.
The effect of crack growth on fatigue life of unstiffened and stiffened structures is considered by using the numerical method based on finite elements - extended Finite Element Method (XFEM). ABAQUS software and Morfeo are used to display the results of the growth of cracks in welded T joint plates of FSW in all regions. Three point – bending load is applied, with stress intensity ratio R = 0. Tension fatigue load is also applied with different stress ratio of R = (0.5, 0, and -1)
All analyzed models are made from aluminum alloy 2024-T351. Material properties in joints zones and geometry mesures of FSW joint are adopted from available experiments. Following examples are analyzed:
- Example 1 Finite element modelling of butt welded joint under static pure Three - Point Bending Load
- Example 2 Finite element modelling of T welded joint under static pure Three - Point Bending Load
- Effect of stiffeners on fatigue crack propagation of welded plate
- Example 1 Finite element modelling of butt welded joint under static tensile loading
- Example 2 Finite element modelling of T welded joint under static tensile loading
- Example 3 Finite element modelling of double T welded joint under static tensile loading
- Effect of stress ratio on fatigue crack propagation of double T welded joint plate under static tensile loading
- Example 1 Stress ratio of 0.5
- Example 2 Stress ratio of 0
- Example 3 Stress ratio of -1
- Experimental Validation of Numerical Results of friction stir welded T-joints
Following results are obtain
- Numerical computations:
- Points coordinates of crack front x, y, z for every progression step,
- Distributions of stress intensity factors- KI along crack front for each progressions step,
- Fatigue life in form of applied load number change - N for each step of propagation.
- Fatigue crack growth rates are plotted versus the distribution of stress intensity factors – KI.
- Experimental Validation of Numerical Results of friction stir welded T-joints is analysed with the following:
- Fatigue life in form of applied load number change - N for each step of propagation., U ovom radu su prikazani inicijacija i rast prsline u T spoju ploče od aluminijumske legure AA2024 –T351, zavarenom mešanjem trenjem (Friction Stir Welding - FSW), primenom mehanike loma. Svi analizirani modeli su napravljeni od legure 2024-A351. Osobine materijala i dimenzije u oblasti FSW spoja su usvojene na osnovu dostupnih eksperimenata.
Uticaj rasta prsline na zamorni vek neukrućenih i ukrućenih konstrukcija je razmatran primenom numeričkih metoda zasnovanih na analizi konačnim elementima – proširenoj metodi konačnih elemenata (PMKE). Korišćeni su softverski paketi ABAQUS i Morfeo za prikaz rezultata rasta prsline u svim oblastima T spojevia ploča zavarenih mešanjem trenjem. Urađeno je ispitivanje savijanja u tri tačke, sa odnosom napona R = 0. Takođe je zadato i zatezno zamorno opterećenje za različite odnose napona (0.5, 0 i -1).
Svi analizirani modeli su napravljeni od legure 2024-A351. Osobine materijala i dimenzije u oblasti FSW spoja su usvojene na osnovu dostupnih eksperimenata. Analizirani su sledeći primeri:
- Primer 1 Modeliranje konačnim elementima sučeonog zavarenog spoja pod čistim statičkim savijanjem u tri tačke
- Primer 2 Modeliranje konačnim elementima T zavarenog spoja pod čistim statičkkim savijanjem u tri tačke
- Uticaji ukrućenja na napredovanje zamorne prsline zavarene ploče
- Primer 1 Modeliranje konačnim elementima sučeonog spoja pod statičkim zateznim opterećenjem
- Primer 2 Modeliranje konačnim elementima T zavarenog spoja pod statičkim zateznim opterećenjem
- Primer 3 Modeliranje konačnim elementima dvostrukog T spoja pod statićkim zateznim opterećenjem
- Uticaj odnosa napona na napredovanje zamorne prsline u dvostrukom T zavarenom spoju pod statičkim zateznim opterećenjem
- Primer 1 Odnos napona 0.5
- Primer 2 Odnos napona 0
- Primer 3 Odnos napona -1
- Eksperimentalna verifikacija numeričkih rezultata dobijenih za T spojeve zavarene mešanjem trenjem
Dobijeni su sledeći rezultati
- Numerički proračuni:
- Koordinate x, y i z za vrh prsline u svakom koraku,
- Raspodele faktora intenziteta napona – KI duž fronta prsline u svakom koraku,
- Zamorni vek izražen preko broja promena primenjenog opterećenja – N za svaki korak napredovanja prsline.
- Brzine rasta zamorne prsline su prikazane u odnosu na raspodelu faktora intenziteta napona – KI.
- Eksperimentalna verifikacija numeričkih rezultata ispitivanja T spojeva zavarenih mešanjem trenjem, uključujući i:
- Zamorni vek izražen preko broja promena primenjenog opterećenja – N za svaki korak.",
journal = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Fatigue crack growth in T welded joint of aluminium alloy, Rast zamorne prsline u T zavarenom spoju legure aluminijuma",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6519"
}

Kraedegh, A.. (2018). Fatigue crack growth in T welded joint of aluminium alloy. in Univerzitet u Beogradu, Mašinski fakultet.
https://hdl.handle.net/21.15107/rcub_machinery_6519

Kraedegh A. Fatigue crack growth in T welded joint of aluminium alloy. in Univerzitet u Beogradu, Mašinski fakultet. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_6519 .

Kraedegh, Abubakr, "Fatigue crack growth in T welded joint of aluminium alloy" in Univerzitet u Beogradu, Mašinski fakultet (2018),
https://hdl.handle.net/21.15107/rcub_machinery_6519 .

TY  - JOUR
AU  - Kraedegh, Abubakr
AU  - Li, Wei
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Trišović, Nataša
AU  - Mitrović, Radivoje
AU  - Kirin, Snežana
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2730
AB  - Fatigue crack growth in friction stir welded T joints under three point bending is simulated numerically using the Extended Finite Element Method (XFEM). Three point bending fatigue load stress is applied at the centre of the plate opposite to the initial crack, with a ratio of stress intensity R = 0 and maximum stress. = 10 MPa. The material properties of all welded regions in the joint, made of aluminium alloy A2024-T351, are adopted from available experiments. All fatigue crack propagation and growth including crack front coordinates (x, y, z) and stress intensity factors (KI, KII, KIII and Kef) are extracted from the analysis results.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Simulation of fatigue crack growth in a2024-t351 t-welded joint
EP  - 6
IS  - 1
SP  - 3
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2730
ER  - 

@article{
author = "Kraedegh, Abubakr and Li, Wei and Sedmak, Aleksandar and Grbović, Aleksandar and Trišović, Nataša and Mitrović, Radivoje and Kirin, Snežana",
year = "2017",
abstract = "Fatigue crack growth in friction stir welded T joints under three point bending is simulated numerically using the Extended Finite Element Method (XFEM). Three point bending fatigue load stress is applied at the centre of the plate opposite to the initial crack, with a ratio of stress intensity R = 0 and maximum stress. = 10 MPa. The material properties of all welded regions in the joint, made of aluminium alloy A2024-T351, are adopted from available experiments. All fatigue crack propagation and growth including crack front coordinates (x, y, z) and stress intensity factors (KI, KII, KIII and Kef) are extracted from the analysis results.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Simulation of fatigue crack growth in a2024-t351 t-welded joint",
pages = "6-3",
number = "1",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2730"
}

Kraedegh, A., Li, W., Sedmak, A., Grbović, A., Trišović, N., Mitrović, R.,& Kirin, S.. (2017). Simulation of fatigue crack growth in a2024-t351 t-welded joint. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(1), 3-6.
https://hdl.handle.net/21.15107/rcub_machinery_2730

Kraedegh A, Li W, Sedmak A, Grbović A, Trišović N, Mitrović R, Kirin S. Simulation of fatigue crack growth in a2024-t351 t-welded joint. in Structural Integrity and Life. 2017;17(1):3-6.
https://hdl.handle.net/21.15107/rcub_machinery_2730 .

Kraedegh, Abubakr, Li, Wei, Sedmak, Aleksandar, Grbović, Aleksandar, Trišović, Nataša, Mitrović, Radivoje, Kirin, Snežana, "Simulation of fatigue crack growth in a2024-t351 t-welded joint" in Structural Integrity and Life, 17, no. 1 (2017):3-6,
https://hdl.handle.net/21.15107/rcub_machinery_2730 .

TY  - JOUR
AU  - Kraedegh, Abubakr
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Sedmak, Simon
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2576
AB  - This paper describes fatigue crack growth in a friction stir welded T joints made of aluminum alloy A2024-T351 under three point bending loads. For this purpose, three dimensional homogeneous isotropic model is used to study the mechanical properties of the welded structure. Extended Finite Element Method (xFEM) including ABAQUS and Morfeo software are used to demonstrate the results of the growth of cracks in FSW 2024-T351 welded joints. Three point bending fatigue load stress is applied in the center of the plate opposite to the initial crack. The material properties in all welded regions of the joint are adopted from available experiments, as well as the fatigue crack growth. Although limited to relatively small crack growth, good agreement between experimental and numerical results, indicate significant potential of the xFEM, enabling also reliable prediction of stringer effect on fatigue crack growth.
PB  - Elsevier Sci Ltd, Oxford
T2  - International Journal of Fatigue
T1  - Stringer effect on fatigue crack propagation in A2024-T351 aluminum alloy welded joint
EP  - 282
SP  - 276
VL  - 105
DO  - 10.1016/j.ijfatigue.2017.08.025
ER  - 

@article{
author = "Kraedegh, Abubakr and Sedmak, Aleksandar and Grbović, Aleksandar and Sedmak, Simon",
year = "2017",
abstract = "This paper describes fatigue crack growth in a friction stir welded T joints made of aluminum alloy A2024-T351 under three point bending loads. For this purpose, three dimensional homogeneous isotropic model is used to study the mechanical properties of the welded structure. Extended Finite Element Method (xFEM) including ABAQUS and Morfeo software are used to demonstrate the results of the growth of cracks in FSW 2024-T351 welded joints. Three point bending fatigue load stress is applied in the center of the plate opposite to the initial crack. The material properties in all welded regions of the joint are adopted from available experiments, as well as the fatigue crack growth. Although limited to relatively small crack growth, good agreement between experimental and numerical results, indicate significant potential of the xFEM, enabling also reliable prediction of stringer effect on fatigue crack growth.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "International Journal of Fatigue",
title = "Stringer effect on fatigue crack propagation in A2024-T351 aluminum alloy welded joint",
pages = "282-276",
volume = "105",
doi = "10.1016/j.ijfatigue.2017.08.025"
}

Kraedegh, A., Sedmak, A., Grbović, A.,& Sedmak, S.. (2017). Stringer effect on fatigue crack propagation in A2024-T351 aluminum alloy welded joint. in International Journal of Fatigue
Elsevier Sci Ltd, Oxford., 105, 276-282.
https://doi.org/10.1016/j.ijfatigue.2017.08.025

Kraedegh A, Sedmak A, Grbović A, Sedmak S. Stringer effect on fatigue crack propagation in A2024-T351 aluminum alloy welded joint. in International Journal of Fatigue. 2017;105:276-282.
doi:10.1016/j.ijfatigue.2017.08.025 .

Kraedegh, Abubakr, Sedmak, Aleksandar, Grbović, Aleksandar, Sedmak, Simon, "Stringer effect on fatigue crack propagation in A2024-T351 aluminum alloy welded joint" in International Journal of Fatigue, 105 (2017):276-282,
https://doi.org/10.1016/j.ijfatigue.2017.08.025 . .

TY  - CONF
AU  - Sedmak, Simon
AU  - Kraedegh, Abubakr
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2667
AB  - The aim of the present investigation is to study the fatigue crack growth of welded T joints made of AA2024-T351 aluminum alloy. Three dimensional finite element models, with cracks as initial defects, will be constructed for this purpose. Fatigue crack growth analyses are performed by using the finite element program ABAQUS to obtain Stress intensity factors around the crack tip for each step of crack propagation. SIF (K) is used as crack tip parameter in Paris equation for the calculation of the fatigue life. In order to predict the fatigue behavior of the welded structure, amplitude tensile loading is applied.
PB  - International Conference on Fracture
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - Fatigue crack growth in aluminum alloyt welded joint
EP  - 815
SP  - 814
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2667
ER  - 

@conference{
author = "Sedmak, Simon and Kraedegh, Abubakr and Grbović, Aleksandar and Sedmak, Aleksandar",
year = "2017",
abstract = "The aim of the present investigation is to study the fatigue crack growth of welded T joints made of AA2024-T351 aluminum alloy. Three dimensional finite element models, with cracks as initial defects, will be constructed for this purpose. Fatigue crack growth analyses are performed by using the finite element program ABAQUS to obtain Stress intensity factors around the crack tip for each step of crack propagation. SIF (K) is used as crack tip parameter in Paris equation for the calculation of the fatigue life. In order to predict the fatigue behavior of the welded structure, amplitude tensile loading is applied.",
publisher = "International Conference on Fracture",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "Fatigue crack growth in aluminum alloyt welded joint",
pages = "815-814",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2667"
}

Sedmak, S., Kraedegh, A., Grbović, A.,& Sedmak, A.. (2017). Fatigue crack growth in aluminum alloyt welded joint. in ICF 2017 - 14th International Conference on Fracture
International Conference on Fracture., 2, 814-815.
https://hdl.handle.net/21.15107/rcub_machinery_2667

Sedmak S, Kraedegh A, Grbović A, Sedmak A. Fatigue crack growth in aluminum alloyt welded joint. in ICF 2017 - 14th International Conference on Fracture. 2017;2:814-815.
https://hdl.handle.net/21.15107/rcub_machinery_2667 .

Sedmak, Simon, Kraedegh, Abubakr, Grbović, Aleksandar, Sedmak, Aleksandar, "Fatigue crack growth in aluminum alloyt welded joint" in ICF 2017 - 14th International Conference on Fracture, 2 (2017):814-815,
https://hdl.handle.net/21.15107/rcub_machinery_2667 .