experimenatel and simulation of residual stresses

The presentation aims to explore the influencing mechanism of DP600 laser welding residual stress on low-cycle fatigue properties. Parameters of impulsionnel laser welding will be studied. First, laser welding residual stress will be acquired by the sequential-coupled thermo-mechanical model containing the heat source model and different plastic material constitutive models. And the obtained residual stress will be imported as the predefined stress field for the following simulation. Then, the direct cyclic technique and combined hardening models will be employed to evaluate the low-cycle fatigue residual stress. More ever, the effects of anisotropy on laser welding and low-cycle fatigue residual stress wil be investigated. Finally, the influences of laser welding residual stress on low-cycle fatigue properties will be discussed, and models will be constructed to predict the residual stress relaxation and fatigue life. All simulation results will be verified by experimental data (X-ray, neutron diffraction). The microstructure will be too realized