This paper studies the influence of displacement rate on mode II delamination of unidirectional carbon/epoxy composites. End-notched flexure test is performed at displacement rates of 1, 10, 100 and 500 mm/min. Experimental results reveal that the mode II fracture toughness GIIC increases with the displacement, with a maximum increment of 45% at 100 mm/min. In addition, scanning electron micrographs depict that fiber/matrix interface debonding is the major damage mechanism at 1 mm/min. At higher speeds, significant matrix-dominated shear cusps are observed contributing to higher GIIC. Besides, it is demonstrated that the proposed rate-dependent model is able to fit the experimental data from the current study and the open literature generally well. The mode II fracture toughness measured from the experiment or deduced from the proposed model can be used in the cohesive element model to predict failure. Good agreement is found between the experimental and numerical results, with a maximum difference of 10%. The numerical analyses indicate crack jump occurs suddenly after the peak load is attained, which leads to the unstable crack propagation seen in the experiment.

Centre for Advanced Materials and Green Technology Faculty of Engineering and Technology Multimedia University Jalan Ayer Keroh Lama Bukit Beruang 75450 Melaka Malaysia

Department of Aerospace Engineering Faculty of Engineering Universiti Putra Malaysia Serdang 43400 Selangor Malaysia

Faculty of Engineering and Science Curtin University Malaysia Miri 98009 Sarawak Malaysia

Institute for Nanomaterials Advanced Technologies and Innovation Studentska 2 461 17 Liberec Czech Republic

School of Engineering University of Southampton Highfield Southampton SO17 1BJ UK

School of Engineering University of Southampton Malaysia Kota Ilmu Educity Iskandar Iskandar Puteri 79200 Johor Malaysia

School of Mechanical Engineering Faculty of Engineering Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia

Technical University of Liberec Studentska 2 461 17 Liberec Czech Republic

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