Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Peel-tension Fatigue Strength of Mechanical Press Joints of Cold Rolled Steel Sheet

냉간 압연강 판재 기계적 접합부의 인장-박리 피로 강도

  • Lee, Man-Suk (Department of Automotive Engineering, Graduate School, Seoul National University of Science and Technology) ;
  • Park, Jong-Min (Department of Automotive Engineering, Graduate School, Seoul National University of Science and Technology) ;
  • Kim, Taek-Young (Department of Automotive Engineering, Graduate School, Seoul National University of Science and Technology) ;
  • Kim, Ho-Kyung (Department of Automotive Engineering, Seoul National University of Science and Technology)
  • 이만석 (서울과학기술대학교 자동차공학과 대학원) ;
  • 박종민 (서울과학기술대학교 자동차공학과 대학원) ;
  • 김택영 (서울과학기술대학교 자동차공학과 대학원) ;
  • 김호경 (서울과학기술대학교 자동차공학과)
  • Received : 2012.07.16
  • Accepted : 2012.09.20
  • Published : 2012.10.31
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Abstract

Peel-tension fatigue experiments were conducted for investigating on fatigue strength of mechanical press joints of SPCC steel sheet used in the field of the automobile industry. In addition, finite element method analysis on the peel-tension specimen was conducted using HyperMesh and ABAQUS softwares. The cold rolled mild steel was used to join the T-shaped peel-tension specimen with a button diameter of 5.4 mm and a punch diameter of 8.3 mm. The fatigue limit load amplitude was found to be 112.4 N at the number of cycles 106, indicating that the ratio of fatigue limit load to static peel-tension strength was about 8%. This value suggests that the mechanical press joint is highly vulnerable to peel-tension load rather than to tensile-shear load, considering that the ratio of fatigue limit load to static tensile-shear strength was about 43%. Fatigue failure mode was found to be interface-failure mode.

Keywords

References

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