3d Multi-impact FE Solution For Peening Residual Stress In Aisi4340 Steel

Author:  Taehyung Kim, Hyungyil Lee, Seong-Kyun Cheong
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008048
Year of Publication:  2008
Abstract:  
ABSTRACT In this paper, we evaluate the residual stress of AISI4340 steel under multi-impact shot peening via 3D Finite element (FE) model with combined physical and kinetic factors. The physical parameters in 3D FE model are elastic-plastic deformation of shot, material damping coefficient, dynamic friction coefficient. The kinematical parameters are impact velocity and angle, shot diameter. Multi-impact FE model consists of 3D FE symmetry-cell. With the symmetry-cell model, we investigate FE peening coverage, dependency on the impact sequence, effect of repeated cycle. We also obtain the residual stress averaged at full-nodes in the surface of symmetrycell. In contrast to rigid and elastic shots, plastically deformable shot produces residual stress closer to the XRD experimental solution. Consequently, we confirmed that the 3D FE model with peening factors and plastic shot successfully evaluate the residual stress by multi-shot peening in AISI4340 steel. KEY WORDS Multi-impact, Finite element coverage, Impact sequence, Repeated cycle, Averaged residual stress, Plastic shot