Fabrication and Finite Element Simulation of Micro-Laser Shock Peening for Micro Dents

Abstract

An innovative surface treatment process micro laser shock peening (μ -LSP) has been developed in this study to fabricate micro dents on Ti-6Al-4V surfaces for improving tribology performance. A 3D finite element simulation model was also developed to investigate transient laser/material interactions at nano timescale during peening. The dynamic mechanical behavior was modeled using a user material subroutine of the internal state variable plasticity model. The temporal and spatial peening pressure was modeled using a user load subroutine. The simulated dent geometry agrees with the measured ones in terms of profile and depth. The results suggested that there is an optimal peening time for the deepest dent. The maximum transient stress in peening direction occurred at a certain pulse time.