Abstract
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.
Highlights
Friction stir welding (FSW), as a solid-state joining technique, has been found to be effective for joining high strength alloys of the 2xxx and 7xxx series, which is extensively used in the aircraft industry
A the computational study on thestudy effect on of polycrystalline microstructure on the plastic on strain plastic strain localization and fracture of aluminum alloys under mechanical loading shows that localization and fracture of FSW aluminum alloys under mechanical loading shows that they are they are determined by the microstructure of in materials in the advancing the weld
The sub-models inserted into the joint macroscopic model are to observe the comprehensive effect of hardening particles and grains on the local stress and strain responses
Summary
Friction stir welding (FSW), as a solid-state joining technique, has been found to be effective for joining high strength alloys of the 2xxx and 7xxx series, which is extensively used in the aircraft industry. Static mechanical properties of friction stir welded (FSW) joint have been found to be affected by a local microstructure of the joint [1,2,3,4,5,6,7]. A the computational study on thestudy effect on of polycrystalline microstructure on the plastic on strain plastic strain localization and fracture of aluminum alloys under mechanical loading shows that localization and fracture of FSW aluminum alloys under mechanical loading shows that they are they are determined by the microstructure of in materials in the advancing the weld [17]. Fatigue behavior and weak areas of the FSW joint were simulated with an FSW simulated an FSW model including the characteristics hardening phases [19].
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