喷丸强化残余应力对疲劳性能和变形控制影响研究进展

As one of the mechanical surface peening techniques, shot peening makes the surface layer of the workpiece deformation hardened and introduces higher residual compressive stress, which reduces the sprouting of microcracks under fatigue stress and inhibits their expansion, thus significantly improving the resistance of the part to fatigue fracture and stress corrosion cracking. Based on the analytical calculation model of shot peening residual stress, the generation of shot peening residual stress is introduced from three aspects：cosine function model, contact stress model and spherical cavity expansion model, and then the simulation prediction of shot peening residual stress and the influence law are discussed. The residual compressive stresses introduced to improve the fatigue strength of the specimen will bring about deformation that affects the form accuracy. Based on this, the effects of shot peening residual stresses on fatigue performance and their evolution in the fatigue process are explained, and the status of research on the prediction and control of shot peening residual stresses deformation is discussed, and finally the future research content and development direction of shot peening residual stresses are prospected.