Residual stress field prediction and fatigue post processing for shot peened mechanical parts with complex geometry

Abstract

Even when properly controlled, shot peening treatment may induce a complex residual stresses (RS) field depending on the geometry of the treated part. Hence, among the variables which affect the fatigue behaviour of shot peened components, the geometry could play a major role. The more widespread method for predicting RS after shot peening consists in modelling the process by simulating the impacts between the shot and the treated part. When the geometry become complex, this method is not consistent with industrial constraints in terms of computing time. Thus the need is to develop a methodology in order to generate the RS field into a shot peened mechanical part with complex non flat geometries, and consequently predict the lifetime in a high cycle fatigue (HCF) regime.