Research on Residual Stress Drops on Material Surface by Laser Shock Processing

Abstract

The distribution of the compressive residual stresses which caused by laser shock processing is a new surface strengthening technology to improve the quality of material surface. ABAQUS is used to simulate the distribution of residual stress field impacted by the laser power densities and the spot shapes. The consequences indicate that: following the laser power intensities increasing, the reflection waves coming from the spot edges should loaded reversely, inducing the opposite deformation, leading to the “residual stress drops” phenomenon; the spot shapes also influent the converging of the reflection waves toward the center, and the residual stress drops at the center are different. This research provides a basis for a better effect of LSP with the optimization of the technological parameters and the decrease of the residual stress drops at the center of the shocked zones.