Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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The Solution of Peening Residual Stress by Angled Impact of Multi Elliptical Shot Ball Based on Finite Element Analysis

유한요소해석에 기초한 다중 타원구 숏볼의 경사충돌에 의해 생성된 피닝잔류응력해

  • Kim, Taehyung (Department of Aeronautical and Mechanical Engineering, Cheongju University)
  • 김태형 (청주대학교 항공기계공학과)
  • Received : 2016.11.07
  • Accepted : 2017.01.05
  • Published : 2017.02.01
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Abstract

Shot peening is widely used to improve the fatigue life and strength of various mechanical parts and an accurate method is important for the prediction of the compressive residual stress caused by this process. A finite element (FE) model with an elliptical multi-shot is suggested for random-angled impacts. Solutions for compressive residual stress using this model and a normal random vertical-impact one with a spherical multi-shot are obtained and compared. The elliptical multi-shot experimental solution is closer to an X-ray diffraction (XRD) than the spherical one. The FE model's peening coverage also almost reaches the experimental one. The effectiveness of the model based on an elliptical shot ball is confirmed by these results and it can be used instead of previous FE models to evaluate the compressive residual stress produced on the surface of metal by shot peening in various industries.

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References

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