The interactions between incoming shot flow and structural target in a Flap Shot Peening process

Abstract

A novel numerical modeling approach capable of computing and simulating the Flap Shot Peening (FSP) dynamic process of industrial interest was proposed by the coupling of the Discrete Element Method (DEM) and Finite Element Method (FEM). During the process of shots impacting the metallic target, the shot flow and the target were respectively modeled by DEM and FEM, and the interaction between the shots and structure was efficiently evaluated by DEM-FEM. This approach can be employed to rationally control and regulate the FSP multiple parameters, which would induce an appropriate distribution of Compressive Residual Stress (CRS) within the target to provide additional resistance to the treated component. In this paper, a benchmark was first performed to verify the computational method successfully. Further, the influence of variant mass flow rates on the target was also investigated. The result shows that low mass flow rates can be replaced by a higher mass flow rate in case both were able to generate a similar shot effect.