Numerical analysis of residual stress distribution on peening process

Abstract

Various peening techniques are employed to prevent stress corrosion cracking or to extend the fatigue life of structures. In this study, to investigate the effect of shot peening on operation, an analysis method that predicts the stress distribution due to shot peening was proposed. Using the proposed method, the load distribution from the shot collisions was modeled, and it was integrated with a dynamic analysis method based on the idealized explicit FEM (IEFEM). The accuracy of the proposed method was confirmed by comparing the stress distribution from the collision of a single shot with the results analyzed using ABAQUS. A thermal elastic-plastic analysis method using IEFEM was applied to the analysis of the residual stress distribution of a multi-pass-welded pipe joint. The calculated residual stress distribution was compared with the measured residual stress distribution measured using X-ray diffraction (XRD). The results showed that the two welding residual distributions were in good agreement. Considering the calculated welding residual stress distribution, the modification of the stress distribution due to shot peening was predicted using the proposed method. A similar stress distribution was obtained using XRD for the case where a large number of collisions were considered.