Study on Simulation of Residual Stress Distribution in Microscale Laser Shock Peening Based on Crystal Orientation

摘要

Microscale laser shock peening (μLSP) can generate beneficial compressive stress distribution in the targets to improve fatigue life of the material. The beam spot size used in μLSP is of the same order as grain size in many materials, the deformation is induced in only a few grains so that it is necessary to treat material as being anisotropic and heterogeneous. The influence of crystal orientation is investigated using single crystal plasticity in finite element analysis. The influence of laser processing parameters on residual stress distribution were discussed with the simulations of μLSP based on (001) orientation, and crystal plasticity theory was adopted to explain the mechanism of influence on residual stress distribution, which will provide a valuable guidance for further study of controlled μLSP.