Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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The Experimental Evaluation of the Mixed Mode Delamination in Woven CFRP/GFRP Laminates under MMB Test

MMB시험에 의한 평직 CFRP/GFRP 적층판 혼합모드 층간분리의 실험적 평가

  • Received : 2013.01.11
  • Accepted : 2013.07.23
  • Published : 2013.08.31
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Abstract

Blades of horizontal axis are nowadays made of composite materials. Generally, composite materials satisfy design provides lower weight and good stiffness, while laminate composites have often damages as like the delamination and cracks at the interface of laminates. The box spar and tail parts of a blade are composed of the CFRP/GFRP hybrid laminate composites. However, delamination and the interfacial crack often occur in the interface of CFRP/GFRP hybrid laminate composites under the mixed mode fracture condition, especially mode I and mode II. Therefore, there is a need for the evaluation of the mixed mode fracture behavior during the delamination of CFRP/GFRP hybrid laminates. This study shows the experimental results for the delamination fracture toughness in CFRP/GFRP hybrid laminate composites. Fracture toughness experiments and estimation are performed by using DMMB(Dissimilar mixed mode bending) specimen. The materials used in the test are a commercial woven type CFRP(Carbon fiber reinforced plastic) prepreg(CF3327) and UD type GFRP(Glass fiber reinforced plastic) prepreg(HD224A). A CFRP/GFRP hybrid laminate composite is composed by the 10 plies CFRP and GFRP prepreg for DMMB. A thickness of CFRP and GFRP layer is 2.5mm and 3.0mm, respectively. Also the fulcrum location which is a loading parameter is changed from 80 to 100mm on the specimen of length 120mm because it defines the ratio of mode I to mode II. In this study, the effects of the fulcrum location are evaluated in the viewpoint of energy release rate in mode I and mode II contribution. The results show that the delamination crack initiates at higher displacement and lower load according to the increase of the fulcrum location ratio. And the variation of the energy release rate for mode I and II contributions for the mode mixity are shown.

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References

  1. D. Craig, "Wind Farms Information Forum", Wind Turbine Accident Data, 2005.
  2. L. Banks-Sills, N. Travitzky and D. Ashkenazi, "Interface Fracture Properties of a Bimaterial Ceramic Composite", Mechanical Materials, Vol. 32, pp. 711-722, 2000. https://doi.org/10.1016/S0167-6636(00)00042-9
  3. A. Kuhl and J. Qu, "A Technique to Measure Interfacial Toughness Over a Range of Phase Angles", Journal of Electron Package, Vol. 122, pp. 147-151, 2000. https://doi.org/10.1115/1.483147
  4. J. A. Wang, I. Wright, M. Lance and K. Liu, "A New Approach for Evaluating Thin Film Interface Fracture Toughness", Material Science Engineering A, Vol. 426, pp. 332-345, 2006. https://doi.org/10.1016/j.msea.2006.04.022
  5. A. Jyoti, R. Gibson and G. M. Newaz, "Experimental Studies of Mode I Energy Release Rate in Adhesively Bonded Width Tapered Composite DCB Specimens", Composites Science and Technology, Vol. 65, pp. 9-18, 2005. https://doi.org/10.1016/j.compscitech.2004.04.006
  6. F. Ozdil and L. A. Carlsson, "Beam Analysis of Angle-ply Laminate DCB Specimen", Composites Science and technology, Vol. 59, No. 2, pp. 305-315, 1999. https://doi.org/10.1016/S0266-3538(98)00069-4
  7. S. Bennati, M. Colleluori, D. Corigliano and P. S. Valvo, "An Enhanced Beam Theory Model of the Assymmetric Double Cantilever Beam Test for Composite Laminates", Composite Science and Technology, Vol. 69, pp. 1735-1745, 2009. https://doi.org/10.1016/j.compscitech.2009.01.019
  8. M. Hojo, K. Kageyama and K. Tanaka, "Prestandardization Study on Mode I Interlaminar Fracture Toughness Test for CFRP in Japan", Composites Science and Technology, Vol. 26, pp. 243-255, 1995.
  9. W. O. Soboyejo, G. Y. Lu, S. Chengalva, J. Zhang and V. Kenner, "A Modified Mixed-mode Bending Specimen for the Interfacial Fracture Testing of Dissimilar Materials", Fatigue Fracture Engineering Materials Structure, Vol. 22, pp. 799-810, 1999. https://doi.org/10.1046/j.1460-2695.1999.t01-1-00203.x
  10. G. V. Marannano and A. Pasta, "An Analysis of Interface Delamination Mechanism in Orthotropic and Hybrid Fiber Metal Composite Laminates", Engineering Fracture Mechanics, Vol. 74, pp. 612-626, 2007. https://doi.org/10.1016/j.engfracmech.2006.09.004
  11. V. Mollon, J. Bonhomme, J. Vina, A. Arguells, "Mixed Mode Fracture Toughness:An Empirical Formulation for GI/GII Determination in Asymmetric DCB Specimens", Engineering Structures, Vol. 32, pp. 3699-3703, 2010. https://doi.org/10.1016/j.engstruct.2010.08.014
  12. Standard Test Method for Mixed Mode I-Mode II Interlaminar Fracture Toughness of Unidirectional Fiber Reinforced Polymer Matrix Composites, ASTM D6671M-06, ASTM Annual Book of Standards, 2006.
  13. J. G. Walliams, "On the Calculation of Energy Rates for Cracked Laminates", Kluwer Academic Publishers, 1987.
  14. F. Ducept, D. Gamby and P. Davies, "A Mixed Mode Failure Criterion Derived from Tests on Symmetric and Asymmetric Specimens", Composite Science Technology, Vol. 59, pp. 609-619, 1999. https://doi.org/10.1016/S0266-3538(98)00105-5

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