Controlled shot peening simulation for realistic impact pattern characterisation

Abstract

Representative shot peening (SP) patterns as function of SP process parameters are calculated and presented. The work scrutinises the SP process parameters affecting the development of coverage and residual stresses (RS) by tackling the following phenomena: shot interactions into the shot stream, distribution of coverage on a reference plate surface, probability of non-uniform impact and relationship of adjacent impacts with RS development. The shot stream is simulated with a 2D kinematic model and the real distribution of the two most important SP parameters, i.e., shot velocity and angle are calculated. The effect of adjacent impacts on RS built-up is examined via a finite element (FE) model, resulting to a criterion about the minimum shot distance that affects the RS field. Finally, a stochastic simulation is performed via a germ-grain Boolean model, which simulates the stochastic nature of the process and results to the definition of realistic SP impact patterns.