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

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

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
Download PDF
⟨ Previous Next ⟩

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.

많은 연구자들이 평직 탄소섬유강화플라스틱에 대해서 연구해왔지만 피로 균열 진전에 관한 연구는 아직도 미지한 상태이다. 그리고 하중과 섬유 배열 각도에 따라 균열 진전 양상이 다름을 알 수 있다. 본 연구에서는 서로 다른 두 개의 섬유 배열각도($0^{\circ}$, $45^{\circ}$)에서 평직 탄소섬유강화플라스틱의 피로 균열 진전에 대해 연구하였다. 평직 탄소섬유강화플라스틱의 피로 균열 진전 테스를 하중비 0.1에 10Hz로 수행하였다. 그 시험 결과로써, 피로 균열 진전 속도(da/dN)와 에너지해방률(${\Delta}G$)과의 그래프를 도출하였고, 섬유 배열 각도에 따른 균열 진전 양상을 $0^{\circ}$의 경우에는 Mode I를 적용하였고, $45^{\circ}$의 경우에는 Mixed Mode를 적용하였다.

Keywords

References

  1. Pris and P.C. Sih, 1969, "Stress Analysis of Cracks," American Society for Testing and Materials, pp.30-83.
  2. Tomohiro Yokozeki, 2002, "Fatigue Growth of Matrix Cracks in the Transverse Direction of CFRP Laminates," Compasites Science and Technology, Vol.62, pp.1223-1229. https://doi.org/10.1016/S0266-3538(02)00068-4
  3. Putic, S., 2003, "Analysis of Fatigue and Crack Growth in Carbon-Fiber Epoxy Matrix Composite Laminates," Strength of Material, Vol.35, No.5, pp.500-507. https://doi.org/10.1023/B:STOM.0000004538.77270.1e
  4. Rybicki E.F. and Kanninen M.F., 1977, "A Finite Element Calculation of Stress Intensity Factors by a Modified Crack Closure Integral," Eng Fract Mech, Vol.9, pp.931-937. https://doi.org/10.1016/0013-7944(77)90013-3
  5. Mandell. J. F., 1975, "Fatigue Crack Propagation Rates in Woven and Nonwoven Fiber Glass Laminates," ASTM Special Technical Publication, pp.515-527.
  6. Kim, J. K., 1990, " Fatigue Crack Propagation of GFRD Composites According to Fiber Array Direction," Conference of The Korea Society of Mechanical Engineers, Vol.2, pp.44-47.
  7. Blanco, N., 2004, "Mixed Mode Delamination Growth in Carbon-Fibre Composite Laminates Under Cyclic Loading," International journal of solids and structures, Vol. 41, pp. 4219-4235. https://doi.org/10.1016/j.ijsolstr.2004.02.040
  8. Choi, J. H., 2008, “Evaluation of Failure Strengths and Fracture Toughness of Plain Weave Composites,” Conference of The Korea Society of Mechanical Engineers, pp. 561-566.
  9. ASTM, 2000, "Standard Test Method for Measurement of Fatigue Crack Growth Rates," E647.
  10. Biner, S. B., 2001, "Mixed-Mode Fracture Characteristics of a Laminated Metal Matrix Composite," Journal of Materials Science, Vol.36, pp.2505-2510. https://doi.org/10.1023/A:1017942418047
  11. Tohru Takamatsu, 1999, "Fatigue Crack Growth Properties of a GLARE3-5/4 Fiber/Metal Laminate," Engineering Fracture Mechanics, Vol.63, pp.253-272. https://doi.org/10.1016/S0013-7944(99)00021-1
  12. Lee, C. S., 1994, “Fatigue Analysis of Composites,” Journal of The Korea Society of Mechanical Engineers, Vol.34, pp.372-383.