한국안전학회지 (Journal of the Korean Society of Safety)

  • 제29권3호
  • /
  • Pages.1-7
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  • 2014
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  • 1738-3803(pISSN)
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  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
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냉간압연강 판재 기계적 접합부의 십자형 인장 하중하에서의 피로강도

Fatigue Strength Evaluation of Mechanical Press Joints of Cold Rolled Steel Sheet under Cross-Tension Loading

  • 김종봉 (서울과학기술대학교 기계.자동차공학과) ;
  • 김택영 (서울과학기술대학교 대학원 자동차공학과) ;
  • 강세형 (서울과학기술대학교 대학원 자동차공학과) ;
  • 김호경 (서울과학기술대학교 기계.자동차공학과)
  • Kim, Jong-Bong (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Kim, Taek-Young (Graduate School, Seoul National University of Science and Technology) ;
  • Kang, Se-Hyung (Graduate School, Seoul National University of Science and Technology) ;
  • Kim, Ho-Kyung (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • 투고 : 2013.10.03
  • 심사 : 2014.05.07
  • 발행 : 2014.06.30
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초록

In this study, for the evaluation of the static and fatigue joining strength of the joint, the geometry of the cross-tension specimen was adopted. The specimens were produced with optimal joining force and fatigue life of the clinch joint specimens was evaluated. The material selected for use in this study was cold rolled mild steel (SPCC) with a thickness of 0.8 mm. The maximum tensile load was 708 N for the specimen with single point. The fatigue endurance limit (=42.6 N) per point approached to 6% of the maximum tensile strength at a load ratio of 0.1, suggesting that the joints are vulnerable to cross-tension loading during fatigue. Compared to equivalent stress and maximum principal stress, the SWT fatigue parameter and equivalent strain can properly predict the current experimental fatigue life. The SWT parameter can be expressed as $SWT=2497.5N^{-0.552)_f$.

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참고문헌

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