Evaluation of Shot-peening-induced Residual Stress Distribution Using Inherent Strain

Abstract

The residual stress distribution in shot peening is strongly dependent on shot diameter, shot velocity, and specimen thickness. Inherent strain is the source of residual stress, which is less affected by specimen dimensions. Experiments using 5-mm-thick aluminum alloy plates and three different diameters of shots revealed the effects of shot diameter and shot velocity on the inherent strain distribution. The inherent strain distribution was expressed by a Gaussian equation in which three coefficients are functions of shot velocity and shot diameter. The inherent strain at an arbitrary shot velocity and diameter can be predicted using the developed equation, and the residual stress distributions were predicted with high accuracy compared with the experimental results.