A simple methodology to optimize shot-peening process parameters using finite element simulations

Abstract

Shot peening is a mechanical surface treatment widely used in the automotive and aerospace industries to improve the fatigue performance of metallic parts. This treatment extends the fatigue life by (i) retarding the crack growth due to the induced compressive residual stresses and (ii) inhibiting the crack initiation through the surface work hardening. However, the effect of shot peening on the fatigue performance is mainly influenced by the choice of the process’s parameters. The aim of this research paper is to propose a simple methodology for optimizing the shot-peening surface’s process parameters taking into account the redistribution of the initial shot-peening properties after cyclic loading. For this purpose, the response surface methodology coupled with finite element analysis is implemented. Moreover, the effects of shot velocity, shot diameter, and peening coverage (duration of treatment) and their interactions on the fatigue performance of shot-peened parts subjected to cyclic loadings are discussed. This analysis can be considered as a very helpful tool for designer engineers in shot-peening parameter optimization.