Simulation of Shot Peening Process Using Combined Hardening Model

Shot peening is a cold working process which induces compressive residual stresses in near-surface layers and thus improves the fatigue strength of components. Shot peening involves the complex stress histories with stress reversals and cyclic loading conditions. In the study, using combined hardening model, the quasi-static simulations of the shot peening process are carried out with the help of finite element method. The different peening sequence, intensity and coverage are considered. The thickness of the layer with compressive residual stress is strongly influenced by shot impact intensity, whereas the stress on the surface and the amount of maximum residual stress below the surface are relatively stable. The coverage changes the residual stress distribution slightly after stress saturation. The coverage and shot impact intensity significantly affect plastic strain.