FE analysis of shot-peening-induced residual stresses of AISI 304 stainless steel by considering mesh density and friction coefficient

ABSTRACT

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.

KEYWORDS:

• Shot peening
• finite element method
• mesh density
• friction coefficient
• deformation-induced martensitic transformation
• residual stresses distribution

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The financial support of the National Natural Science Foundation of China (NSFC) [No.51405356] and the Research Fund for the Doctoral Program of Higher Education of China [No. 20130143120015] are gratefully acknowledged.