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

The Korean Society of Mechanical Engineers (대한기계학회)
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Fatigue Damage Evaluation of Woven Carbon-Fiber-Reinforced Composite Materials by Using Fatigue Damage Model

피로 손상 모델을 이용한 직조 탄소섬유강화 복합재료의 피로 손상 평가

  • 박홍선 (성균관대학교 기계공학과) ;
  • 최정훈 (성균관대학교 기계공학과) ;
  • 구재민 (성균관대학교 기계공학과) ;
  • 석창성 (성균관대학교 기계공학과)
  • Received : 2010.01.05
  • Accepted : 2010.04.13
  • Published : 2010.06.01
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Abstract

Owing to the high specific strength and stiffness of composite materials, they are extensively used in mechanical systems and in vehicle industries. However, most mechanical structures experience repeated load and fatigue. Therefore, it is important to perform fatigue analysis of fiber-reinforced composites. The properties of composite laminates vary depending upon the stacking sequence and stacking direction. Fatigue damage of composite laminates occurs according to the following sequence: matrix cracking, delamination, and fiber breakage. In this study, fatigue tests were performed for damage analysis. Fatigue damages, which have to be considered in fatigue analysis, are determined by using the stiffness values calculated from hysteresis loops, and the obtained fatigue damage curve is examined using Mao's equation and Abdelal's equation.

탄소섬유강화 복합재료는 금속재료에 비하여 높은 비강성과 비강도 등의 우수한 기계적 성질을 나타내고 있으며, 이러한 이유로 최근 경량화가 요구되는 항공기용 재료와 자동차용 재료 등으로 그 사용이 급격히 증가하여 금속재를 대체하고 있다. 그러나 대부분의 기계구조물에서는 반복하중에 의한 피로 파손이 주로 발생하고 있다. 그러므로 섬유강화 복합재를 사용한 기계구조물의 내구성을 확보하기 위해서는 이에 대한 피로 해석 및 내구성 평가가 필요하다. 따라서 피로 손상 모델을 이용하여 피로 시험으로부터 구한 손상량을 이용하여 피로손상 누적곡선을 획득하고 해석하였다.

Keywords

References

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