Numerical Analysis of Shot Peening with Incident Angle

Abstract

Shot peening has been used to improve the fatigue strength of metal structural components because it can produce large compressive residual stress near the surface. The distribution of compressive residual stress is strongly dependent on shot peening conditions such as the material of the shot, the shot diameter, the shot velocity, the incident angle, and the peening time (coverage). In this study, a finite element model including multiple shots and the specimen was developed in order to investigate the influence of the incident angle on the compressive residual stress and the depth of its location from the surface in high-strength aluminum alloy. The residual stress and its distribution were analyzed when multiple shots were randomly impacted on the surface of the specimen. The analyzed residual stress distribution using the kinematic material model agreed very well with experimental ones at the incident angles of 90° and 30°. It can be concluded that the depth of the compressive residual stress is proportional to the velocity component perpendicular to the surface.