Energy conversion and residual stress distribution in shot peening process

Three-dimensional FE model of the shot peening process was developed here to investigate effects of mechanical behavior of a target and impact velocity on energy conversion coefficient K as well as residual stress distribution. The FE results showed that the target with a higher ratio of E/σ_y and a lower strain hardening rate exhibits a high efficiency of shot peening; the increase in yield stress of the target can induce an increase in maximum residual compression stress, while a decreased depth of the residual stress filed can be observed; both the increases in strain hardening rate and impact velocity can induce increases in maximum residual compression stress and depth of residual compression stress field, meanwhile, it can also cause a decrease in the surface residual compression stress. The results provided a theoretical foundation for selection of target material in view of energy conversion.