A Novel 3d Finite Element Simulation Model For The Prediction Of The Residual Stress State After Shot Peening

Author:  M. Zimmermann, V. Schulze, H. U. Baron, D. L
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008046
Year of Publication:  2008
Abstract:  
ABSTRACT 3D Finite-Element shot peening models known from literature do not take into account component thickness as a geometric parameter influencing the residual stress state after shot peening. Hence classic approaches and a new approach of model constraints were investigated for their capability to contribute to a realistic prediction of the residual stress state after shot peening. The numerical results obtained were compared with x-ray measurements. The strain rate dependent deformation behavior of the investigated and aged material IN718 was taken into account using an elasto-viscoplastic material model with combined isotropic and kinematic hardening. It was found that a small thickness has no influence on the compressive residual stresses in the surface region but great influence on the tensile residual stresses present in deeper regions. The new approach of model constraint takes into account deflection effects and yields to a very good accordance with experimental results. KEY WORDS Shot Peening, simulation, material modeling, IN718, curved surfaces