In order to investigate the effect of shot peening (SP) on residual stress distribution of AISI 304 stainless steel, a 3D dynamic model for describing single and multiple shot impact phenomenon was built via ABAQUS/Explicit 6.10 by considering the mesh density of treated component as well as the friction coefficient between shot and treated component and validated via X-ray residual stress measurement. The results show that an optimal surface element size about 1/18th of the dimple diameter and reasonable friction coefficient of μ > 0.2 are the key factors for the accuracy of residual stress estimation and the computational efficiency. The error of simulated residual stresses indicates the effect of the deformation-induced martensitic transformation phenomenon should be considered in AISI 304 stainless steel SP model. The effects of shot hardness, impact angle, velocity, diameter and coverage ratio on residual stress distribution were examined and discussed via the optimised SP model.
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