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Journal of Composite Materials
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Effects of Large Deflection on Mode II Fracture Test of Composite Materials

H. Wang

National Research Council of Canada, Industrial Materials Institute, 75 de Mortagne Blvd., Boucherville, Québec, Canada J4B 6Y4

T. Vu-Khanh

Department of Mechanical Engineering, University of Québec, Ecole de Technologie Supérieure, 4750 Avenue Henri-Julien, Montréal, Québec, Canada H2T 2C8

V. N. Le

Department of Mechanical Engineering, University of Québec, Ecole de Technologie Supérieure, 4750 Avenue Henri-Julien, Montréal, Québec, Canada H2T 2C8

Large deflection response and its effect on measuring the Mode II fracture toughness of composites have been studied for the End-Loaded-Split (ELS) test. The response is analyzed by nonlinear beam theory and the correction to toughness calculation based on linear beam theory is obtained for any crack length. The effect of large deflection on accuracy of load measurement is also studied. In addition, the ELS test is used to measure the Mode II toughness of carbon fiber/polyetheretherketone (PEEK) composite. It is found that the data reduction procedure based on linear beam theory needs to be corrected if the fracture occurs at large deflections. Special care should also be taken towards a valid load measurement when using the ELS test in the large deflection range.

Key Words: delamination • toughness • Mode II fracture • large deflection

Journal of Composite Materials, Vol. 29, No. 6, 833-849 (1995)
DOI: 10.1177/002199839502900608
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