Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Optimal 3D FE Model for Evaluation of Peening Residual Stress Under Angled Multi-impacts

다중경사충돌시 피닝잔류응력 평가를 위한 최적의 3차원 유한요소모델

  • Hyun, Hong-Chul (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Kim, Tae-Hyung (Gas Turbine Technology Service Center, KEPCO Plant Service & Engineering Co.) ;
  • Lee, Hyung-Yil (Dept. of Mechanical Engineering, Sogang Univ.)
  • 현홍철 (서강대학교 기계공학과) ;
  • 김태형 (한전 KPS(주) GT 정비기술센터) ;
  • 이형일 (서강대학교 기계공학과)
  • Received : 2010.10.26
  • Accepted : 2011.12.13
  • Published : 2012.02.01
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Abstract

The FE model for shot peening often assume that shots impact vertically on the engineering parts to generate compressive residual stresses. However, the shots obliquely impact on the surface in actual peening. In this work, we propose a 3D finite element (FE) model for evaluation of residual stress under angled shot peening. Using the FE model for angled multi-impact, we examine the effects of factors such as impact angle, impact pattern and the number of shots. Plastic deformation of shot is also considered. To validate the model, we then compare the FE solution with experimental result by X-ray diffraction (XRD). The proposed model will be a base of 3D multi-impact FE model with diverse impact angles.

잔류응력 생성을 위한 대부분의 숏피닝 유한요소 해석모델은 숏볼이 재료표면에 수직으로 충돌하는 것을 가정한다. 하지만 실제 피닝공정에서 숏볼은 경사각을 갖고 재료표면에 충돌한다. 본 논문 에서는 잔류응력평가를 위한 3차원 경사충돌 유한요소 해석모델을 제안하였다. 다중경사충돌 유한요소 해석모델을 이용하여, 투사각, 충돌패턴, 숏볼수량 등 피닝인자들이 해석해에 미치는 영향을 조사하였다. 아울러 숏볼의 소성변형도 고려하였다. 유한요소해와 XRD 실험해의 비교를 통해 해석모델의 유효성을 검증했다. 본 논문에서 제안된 모델은 다양한 경사각에 대한 다중숏 충돌 유한요소 해석모델의 기초가될 것이다.

Keywords

References

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