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A 3D FEA Model with Plastic Shots for Evaluation of Peening Residual Stress due to Multi-Impacts

다중충돌 피닝잔류응력 평가를 위한 소성숏이 포함된 3차원 유한요소해석 모델

  • 김태형 (서강대학교 대학원 기계공학과) ;
  • 이형일 (서강대학교 기계공학과)
  • Published : 2008.08.01

Abstract

In this paper, we propose a 3-D finite element (FE) analysis model with combined physical behavior and kinematical impact factors for evaluation of residual stress in multi-impact shot peening. The FE model considers both physical behavior of material and characteristics of kinematical impact. The physical parameters include elastic-plastic FE modeling of shot ball, material damping coefficient, dynamic friction coefficient. The kinematical parameters include impact velocity and diameter of shot ball. Multi-impact FE model consists of 3-D symmetry-cell. We can describe a certain repeated area of peened specimen under equibiaxial residual stress by the cell. With the cell model, we investigate the FE peening coverage, dependency on the impact sequence, effect of repeated cycle. The proposed FE model provides converged and unique solution of surface stress, maximum compressive residual stress and deformation depth at four impact positions. Further, in contrast to the rigid and elastic shots, plastically deformable shot produces residual stresses closer to experimental solutions by X-ray diffraction. Consequently, it is confirmed that the FE model with peening factors and plastic shot is valid for multi-shot peening analyses.

Keywords

Symmetry-Cell;Peening Coverage;Impact Sequence;Repeated Cycle;Multi-Impact;Equi-biaxial Stress

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Cited by

  1. Residual stress near single shot peening impingements determined by nanoindentation and numerical simulations vol.50, pp.5, 2015, https://doi.org/10.1007/s10853-014-8792-0
  2. Area-Averaged Solution of Peening Residual Stress Using a 3D Multi-impact Symmetry-cell FE Model with Plastic Shots vol.33, pp.4, 2009, https://doi.org/10.3795/KSME-A.2009.33.4.310
  3. Effect of Strain Rate and Material Hardness on Residual Stress in Multiple Impact Shot Peening vol.35, pp.11, 2011, https://doi.org/10.3795/KSME-A.2011.35.11.1369