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Evaluation of Fatigue Crack Propagation Depending on Fiber Array Direction in Woven CFRP Composites

평직 CFRP 복합재료의 섬유 배열각도별 피로 균열 성장 평가

  • 금진화 (성균관대학교 기계공학과) ;
  • 최정훈 (성균관대학교 기계공학과) ;
  • 박홍선 (성균관대학교 기계공학과) ;
  • 구재민 (성균관대학교 기계공학과) ;
  • 석창성 (성균관대학교 기계공학과)
  • Received : 2009.12.11
  • Accepted : 2010.04.01
  • Published : 2010.06.01

Abstract

Many researchers have studied woven fabric carbon-fiber-reinforced composite (CFRP) materials but the study of fatigue crack propagation in composites has been insufficient. It has known that the crack propagation behavior differs depending on the load and the fiber direction. In this study, the fatigue crack propagation along two different fiber array directions ($0^{\circ}$, $45^{\circ}$) in plain woven CFRP composite was investigated. Fatigue crack propagation tests were conducted on the woven CFRP composite under a sinusoidal waveform load with stress ratios of 0.1 at a frequency of 10 Hz. Once the results of the tests were obtained, fatigue crack propagation rates (da/dN) were plotted against the energy release rate amplitude (${\Delta}G$), and it was observed that either mode I crack propagation or mixed mode crack propagation occurs depending on the fiber array direction.

Keywords

Plane Weave CFRP;Fatigue Crack Propagation;Crack Length;Fiber Array Direction;Energy Release Rate

Acknowledgement

Supported by : 한국과학재단

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