Citation

Low, Kean Ong and Johar, Mahzan and Israr, Haris Ahmad and Gan, Khong Wui and Rahimian Koloor, Seyed Saeid and Petrů, Michal and Wong, King Jye (2021) Displacement Rate Effects on the Mode II Shear Delamination Behavior of Carbon Fiber/Epoxy Composites. Polymers (Basel), 13 (11). p. 1881. ISSN 2073-4360

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Fractography
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN600-799 Metallurgy
Divisions:	Faculty of Engineering and Technology (FET)
Depositing User:	Ms Nurul Iqtiani Ahmad
Date Deposited:	03 Jul 2021 02:58
Last Modified:	03 Jul 2021 02:58
URII:	http://shdl.mmu.edu.my/id/eprint/8854

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