Browse > Article
http://dx.doi.org/10.14346/JKOSOS.2013.28.4.014

The Experimental Evaluation of the Mixed Mode Delamination in Woven CFRP/GFRP Laminates under MMB Test  

Kwak, Jung-Hoon (Graduate School, Pukyong National University)
Kang, Ji-Woong (Faculty of Health, Daegu Haany University)
Kwon, Oh-Heon (Department of Safety Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Safety / v.28, no.4, 2013 , pp. 14-18 More about this Journal
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.
Keywords
MMB(mixed mode bending); energy release rate; hybrid laminate; fulcrum location; mode mixity;
Citations & Related Records
연도 인용수 순위
  • Reference
1 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.   DOI   ScienceOn
2 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.   DOI   ScienceOn
3 D. Craig, "Wind Farms Information Forum", Wind Turbine Accident Data, 2005.
4 L. Banks-Sills, N. Travitzky and D. Ashkenazi, "Interface Fracture Properties of a Bimaterial Ceramic Composite", Mechanical Materials, Vol. 32, pp. 711-722, 2000.   DOI   ScienceOn
5 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.   DOI   ScienceOn
6 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.   DOI   ScienceOn
7 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.   DOI   ScienceOn
8 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.   DOI   ScienceOn
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.   DOI   ScienceOn
10 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.
11 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.   DOI   ScienceOn
12 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.   DOI   ScienceOn
13 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.
14 J. G. Walliams, "On the Calculation of Energy Rates for Cracked Laminates", Kluwer Academic Publishers, 1987.