Finite Element Simulation Of Shot Peening And Its Experimental Verification

In this paper, shot peening model has been established and finite element method (FEM) has been used to simulate shot peening in the actual process. Several parameters are chosen in this paper, including shot diameter, shot speed and shot angle. The material is spring steel SAE1070 which is used to manufacture Almen strip. The simulation results and the residual stress distribution curve on material depth coincide well with the actual shot peening situation. Shot peening experiments and residual stress measuring experiments also have been done in this paper to provide the correlation data for simulation.The results of shot peening simulation shows that:changing the shot diameter only, the surface residual stress and the max residual stress change negligibly small on the premise that the shot speed and shot angle are determined, however, the depth of max residual stress layer and the depth of residual stress layer change greatly, this indicates that shot diameter influents the depth of residual stress layer significantly. Meanwhile, the distribution of residual stress illustrates that there is a best shot diameter, it can not only satisfy the requirement of shot peening, but also satisfy the surface roughness Ra on the premise that other factors are determined.Remaining other conditions the same and only changing the shot peening or the shot angle, I can find that both the surface compressive residual stress or the max compressive residual stress are increasing, however the depth of max compressive residual stress layer and the depth of compressive residual stress change negligibly small. Meanwhile changing shot speed or shot angle only, the compressive residual stress changes in a fluctuating way. Like the study of shot diameter, there is an optimal shot speed and shot angle that satisfy not only the shot peening requirement but also the surface roughness Ra.At the last of the paper, I have studied the influence of shot coverage on the compressive residual stress, the distribution of the compressive residual stress in the double shot peening model is very similar to the single shot peening model. Furthermore, the residual stress distribution curve on material depth almost coincides, this result illustrates that the effect of shot coverage on the residual stress distribution is small.