Abstract: The shot peening process of 40Cr steel single-edge-notch-tension (SENT) specimens is simulated by finite element method using ABAQUS/Explicit codes. The influence of shot peening parameters on the residual stress field is studied. A three-dimensional weight function method is used to calculate stress intensity factors for surface cracks in the residual stress fields induced by shot peening, and the influence of shot peening parameters on the compressive residual stress intensity factor, K_res, is analyzed. It is found that when the surface crack is relatively small, K_res is mainly influenced by the surface compressive residual stress; the higher the surface compressive residual stress, the larger the absolute value -K_res. With the increase of crack size, the deeper the compressive residual stress field is, the deeper will the maximum -K_res takes place. When the surface crack reaches a certain dimension, -K_res changes mainly with the depth of the compressive residual stress; the deeper the compressive residual stress field, the larger is the -K_res.

Key words: shot peening, finite element, three-dimensional weight function method, residual stress, stress intensity factors