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

The Korean Society of Mechanical Engineers (대한기계학회)
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Vibration Fatigue Analysis for Multi-Point Spot-Welded SPCC Structure Considering Change of Dynamic Response

동적응답의 변화를 고려한 점용접부의 진동피로해석

  • Kang, Ki-Weon (School of Mechanical and Automotive Engineering, Kunsan Nat'l Univ.) ;
  • Chang, Il-Joo (School of Mechanical Engineering, Hanyang Univ.) ;
  • Kim, Jung-Kyu (School of Mechanical Engineering, Hanyang Univ.)
  • 강기원 (군산대학교 기계자동차공학부) ;
  • 장일주 (한양대학교 기계공학부) ;
  • 김정규 (한양대학교 기계공학부)
  • Received : 2010.05.06
  • Accepted : 2010.06.23
  • Published : 2010.09.01
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Abstract

Spot welding is the primary method of joining sheet metals in the automotive industry. As automobiles are subjected to fatigue loading, some spot welds may fracture before the whole system has failed. This local fracture of spot welds may lead to change in the dynamic response and consequently affect fatigue behavior of an automobile. Therefore, this change in dynamic response should be taken into consideration to assess the fatigue life of structures subjected to spectrum loading, such as automobiles. In this study, vibration fatigue analysis was performed by taking into consideration the change in the dynamic response due to accumulated damage at spot-welded parts. Fatigue tests were carried out on tensile-shear spot-welded specimens under constant amplitude loading condition. And the fatigue life of spot welds under spectrum loading was predicted using vibration fatigue analysis method based on finite element analysis.

점용접은 자동차 산업에서 차체 구조물의 대표적 접합방법으로서 차량에 피로하중이 작용할 경우 구조물 전체의 파손 발생이전에 점용접부 일부에 조기 피로파손의 발생가능성이 존재한다. 이러한 점용접부의 국부적 파손은 차량 구조물의 동적 반응 및 이에 따른 피로거동의 변화를 야기할 가능성이 존재한다. 따라서 차량과 같이 스펙트럼하중을 받는 구조물의 피로수명 평가를 위해서는 이러한 점용접부의 국부적 파손에 의한 동적 반응의 변화를 고려하여야 한다. 본 논문에서는 점용접부의 누적피로손상으로 인한 동적반응의 변화를 고려한 진동피로해석을 수행하였다. 이에 필요한 S-N 선도는 전단 점용접 시험편에 대한 일정진폭 피로시험을 통하여 획득하였다. 또한 스펙트럼하중하의 점용접부의 피로수명은 유한요소해석에 기반한 진동피로해석을 통하여 평가하였다.

Keywords

References

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