Investigating the effect of shot peening parameters on the peened surface damage using FEA

Abstract

Shot peening is a cold working process that generates compressive residual stresses on the surface by blasting a numerous of shots at a very high speed, also it is considered a complex process to be simulated. In this study, a simulation of a single spherical shot on stainless steel 410 martensitic target was implemented utilizing a finite element software (ANSYS Explicit), to study the contact parameters, surface damage, and the generated residual compressive stresses (RCS) just beneath the surface. Several conditions were conducted varying the speed of the shot and the angle of incidence. Two prior made empirical models based on vertical shooting were used to calculate the depth and the diameter of indentation, then the calculated values were compared with the simulation's results. The novelty of this work is to test the validity of these quasi-static empirical models which are based on vertical actual shot peening and indentation experiments and use them to support inclined shot peening simulation as substitution for experiments. The results show that the validity for the empirical models which are utilized in prediction of inclined shot peening contact parameters was proved, inclined impact gives a better RCS beneath the surface, and less geometrical deformation which keep the surface roughness in an acceptable range, however, shooting at angles lower than 45° can cause material removal, a rough surface, and less RCS.