Numerical Simulation and Experimental of Residual Stress Field of SAE1070 Spring Steel Induced by Laster Shock

Laser Shock Processing (LSP) is an innovative surface treatment technology. LSP can induce compress residual stress layer in the surface of metallic materials, which is used for improving the fatigue life. In this study, the propagation course of typical laser shock wave in material was analyzed according to the theory of plasticity dynamics and the theory of stress wave. The effects of laser shock processing, residual stress of SAE1070 steel surface layer were studied. The finite element software ANSYS/LS-DYNA was applied to simulate the residual stress field of SAE1070 steel surface layer induced by laser shock processing. A bilinear isotropic model in a nonlinear inelastic model is created by using ANSYS/LS-DYNA finite element analysis software. Shock wave pressures under different peak loads are adopted to predict residual stress distribution. The experimental results for the magnitude and distribution of residual stress are consistent with the numerical simulation.