A 3D FE model for evaluation of peening residual stress under angled multi-shot impacts

The finite element (FE) model for shot peening often assumes that shots impact vertically on the engineering parts to generate compressive residual stresses. However, the shots obliquely impact on the surface in actual peening. In this work, we propose a 3D FE model for evaluation of residual stress resulting from angled shot peening. Using the present FE model for angled multi-shot impacts, we examine the effects of factors such as impact angle, impact pattern and the number of shots. Plastic deformation of shot is also considered. To validate the model, we then compare the FE solution with experimental results by X-ray diffraction (XRD). The model will serve as a base of 3D multi-impact FE model for various incidence angles.