Features of the Distribution of Residual Stresses and Roughness after Laser Shock Peening

Abstract

This study develops an analytical model to determine residual stresses and surface roughness after the impact of multiple laser pulses. The effect of different parameters of laser shock peening on residual stresses, the depth of their occurrence, and the surface roughness have been studied for the V95 aluminum alloy. An increase in the laser power is found to influence the growth of compressive residual stresses, the depth of their occurrence, and surface roughness. When the laser beam radius increases, the depth of residual stress occurrence grows significantly. The growth of the overlap ratio causes an increase in residual stresses, while their occurrence depth changes slightly. During the design of the experiment, the maximum depth of compressive residual stresses and the lowest roughness can be reached by controlling the laser shock peening parameters.