Heterogeneous local straining behavior under monotonic and cyclic loadings in a friction stir welded aluminum alloy

Besel, Yasuko; Besel, Michael; Dietrich, Eric; Wischek, Janine; Mercado, Ulises Alfaro; Kakiuchi, Toshifumi; Uematsu, Yoshihiko

doi:10.1016/j.ijfatigue.2019.03.037

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…It also relates to the welding defects and applied load. The initiation and propagation of fatigue cracks are influenced by the evolution of microstructures, hardness distribution, and local strain [23]. A single factor might not accurately predict the fatigue fracture behavior of welded joints.…”

Section: Introductionmentioning

confidence: 99%

Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints

Sun

Wei

Shang

et al. 2020

Metals

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In order to study on tensile and fatigue fracture mechanism of friction stir welded (FSW) joints, the tensile and fatigue behavior of FSW joints are studied based on the microstructure and strain distribution. The large plastic deformation and fracture occurred in the thermo-mechanically affected zone (TMAZ) on retreating side in tension tests. High contents of shear texture and small angle grain boundary reduce the tensile mechanical property of TMAZ material. The fatigue weak area for FSW joints is affected by the loading condition. The strain concentration in the welded nugget zone (WNZ) and base material makes the fatigue fracture liable to happen in these areas for the FSW joints under the stress ratios of 0.1 and −0.3. When the fracture occurred in WNZ, the crack initiation mainly occurred in clusters of hardened particles, while when the fracture happened in base material, the crack initiation mainly occurred near the pit. The crack in WNZ propagated in an intergranular pattern and the crack in the other areas extended in a transgranular mode, leading to a higher crack growth rate of WNZ than of other regions.

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Section: Introductionmentioning

confidence: 99%

Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints

Sun

Wei

Shang

et al. 2020

Metals

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“…Fatigue behavior and fracture of the joints are sensitive to the microstructures of different zones for the joints [8]. Besel et al [9] found that fatigue crack initiation and the following propagation of FSW aluminum Al-Mg-Sc alloy were influenced by microstructure and hardness distribution. Crack initiation behavior and fatigue life are attributed to the local high plastic straining behavior and the heterogeneous microstructure.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Modeling Containing Hardening Particles and Grain Orientation for Aluminum Alloy FSW Joints

Sun

Guo

Xiao³

et al. 2019

Materials

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The macro-mesoscopic joint fatigue model containing hardening particles and crystal characteristics is established to study the effect of the hardening particles and the grain orientation on fatigue properties of an aluminum alloy friction stir welding (FSW) joint. The macroscopic model is composed of the weld nugget zone, thermo-mechanically affected zone, heat-affected zone, and base material, according to the metallurgical morphology and hardness distribution of the joint. Cyclic stress and strain data are used to determine the material properties. The fatigue parameters used in the calculation of cyclic stresses and strains are obtained with the four-point correlation method. The mesoscopic models of different zones are inserted into the joint macroscopic model as submodules. The models containing the information of hardening particles and grain orientation are established with crystal plasticity theory for the grains and isotropic hardening rule for the hardening particles. The effects of hardening particles and grain orientation on the stress and strain responses are discussed. The simulation results show that high-angle misorientation of adjacent grains hinders the stress transfer. The particle cluster or cracked particles intensify the stress and strain concentrations.

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“…Currently, the DIC method has been widely used in the measurement of full-field strain in the FSW joints during static tension testing and has achieved good results. In the fatigue, the correlation between the inhomogeneous microstructure of the FSW joint and selective strain localization in fatigue has been investigated in some previous studies (Deng et al, 2017;Infante et al, 2016;Besel et al, 2019;Wang et al, 2022;He et al, 2015). It was reported that the difference of the microstructure generally leads to the selective strain localization in the weld, which is closely associated with the fatigue crack initiation location and results in the final fracture of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous deformation of friction stir welded aluminum alloy 6061 in tension and high cycle fatigue

DAI

Liu

Zhan

et al. 2022

IJSI

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PurposeThe investigations provide a basis for the optimization of the alloy 6061-T6 friction stir welding (FSW) process to improve the mechanical properties of welded joints.Design/methodology/approachThe local deformation of the FSW joint in tension and fatigue test were experimentally investigated by digital image correlation (DIC) technique.FindingsThe local stress-strain behaviors of the sub-regions show that the plastic strain always concentrated at the heat affected zone (HAZ) on the advancing side both in tension and high cycle fatigue and eventually leads to the final fracture. The evolution of the plastic strain at very low stress is extremely slow and accounts for most of the total fatigue life. However, the local deformation exhibits a sudden increase just before the fatigue failure.Originality/valueBased on the experimental data, the result indicates that the HAZ is the weakest zone across the weld and the strain localization in high cycle fatigue is very harmful and unpredictable for the FSW joints.

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Heterogeneous local straining behavior under monotonic and cyclic loadings in a friction stir welded aluminum alloy

Cited by 23 publications

References 26 publications

Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints

Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints

Fatigue Modeling Containing Hardening Particles and Grain Orientation for Aluminum Alloy FSW Joints

Heterogeneous deformation of friction stir welded aluminum alloy 6061 in tension and high cycle fatigue

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