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평직 CFRP 홀 노치재의 피로 수명 예측

Prediction of Fatigue Life for Hole-notched Weave CFRP Plate

  • 김상영 (성균관대학교 기계공학 대학원) ;
  • 김용석 (성균관대학교 기계공학 대학원) ;
  • 권희환 (성균관대학교 기계공학 대학원) ;
  • 최정훈 (성균관대학교 기계공학 대학원) ;
  • 구재민 (성균관대학교 기계공학부) ;
  • 석창성 (성균관대학교 기계공학부)
  • 발행 : 2010.06.30

초록

최근 들어 높은 비강성, 화학적 특성 등으로 인하여 CFRP 복합재료는 여러 분야에서 많이 사용되고 있다. 대부분의 CFRP 복합재료를 이용한 구조물들은 여러 개의 독립된 부재들은 볼트(bolt)나 핀(pin)과 같은 기계적인 체결방법에 의해 조립 제작된다. 이때 독립된 부재들을 하는 경우가 많은데, 이와 같은 체결법은 홀과 같은 불연속부를 부재에 형성하게 된다. 홀 등의 불연속부는 재료 내의 노치로 작용하여 정하중 및 피로하중 하에서 재료의 강도를 저하시키는 원인이 된다. 본 연구에서는 평활재와 홀 노치재를 이용하여 실험적으로 피로수명을 평가하였으며 이 결과들을 비교하여 홀 노치재의 피로수명 예측식을 제안하였다.

Recently, CFRP composite is more and more used in the various fields because of a higher specific modulus, chemical property and so on. Most products using CFRP composite are manufactured by construction of components. Various components are joined with those by bolts and pins. Holes for bolts and pins decrease strength and fatigue life of components, because those act as notch in structures. In this paper, we experimentally evaluated the fatigue life of hole-notched and unnotched weave CFRP plate. Then, we compared the two results and proposed an equation for prediction of fatigue life.

키워드

참고문헌

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피인용 문헌

  1. Effect of the Insert Shape on the Improvement of Durability of Bolted Joints Applied to Composite Bogie Frames vol.38, pp.7, 2014, https://doi.org/10.3795/KSME-A.2014.38.7.765
  2. 서브모델링 기법을 이용한 철도차량 복합재 대차프레임의 금속재 체결부 볼트 위치 최적화 해석 연구 vol.23, pp.6, 2010, https://doi.org/10.7234/kscm.2010.23.6.019