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Analysis of the Residual Stress due to Cold Expansion and Stress Intensity Factor in CT Specimen Using Finite Element Method

유한요소법을 이용한 CT 시편의 홀확장 잔류응력 및 응력확대계수 해석

  • Jang, Jae-Soon (Dept.of Mechanical Engineering, Graduate School of Sungkyunkwan University) ;
  • Yang, Won-Ho (Dept.of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Cheol (Dept.of Mechanical Design, Graduate School of Sungkyunkwan University) ;
  • Ko, Myung-Hoon ;
  • Cho, Myoung-Rae (Dept.of Computer Applied Mechanical, Induk Institute of Technology)
  • 장재순 (성균관대학교 대학원 기계공학과) ;
  • 양원호 (성균관대학교 기계공학부) ;
  • 김철 (성균관대학교 대학원 기계설계학과) ;
  • 고명훈 (대림대학 산업기술경영과) ;
  • 조명래 (인덕대학 컴퓨터응용기계 계열)
  • Published : 2002.05.01

Abstract

Cold expansion method is retarded of crack initiation due to the compressive residual stress developed on the hole surface. Previous research has just been study about residual stress distribution in the hole surrounding. But, The purpose of this study was to improve the understanding of the residual stress effect in hole surrounding as crack growth from another hole. In this paper, it is shown that residual stress is redistributed due to the application of cold expansion process for CT specimen using finite element method. It is further shown that tensile stress increases in proportion to cold expansion ratio in the vicinity of crack. It is thought that stress intensity factor increases with cold expansion ratio.

Keywords

Cold Expansion Method;J Integral;Fastener Hole;Stress Intensity Factor;Residual Stress

References

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