Displacement rate effects on mixed-mode I/II delamination of laminated carbon/epoxy composites


Low, Kean Ong and Johar, Mahzan and Sung, Aun Naa and Mohd Nasir, Mohd Nazri and Rahimian Koloor, Seyed Saeid and Petrů, Michal and Israr, Haris Ahmad and Wong, King Jye (2022) Displacement rate effects on mixed-mode I/II delamination of laminated carbon/epoxy composites. Polymer Testing, 108. p. 107512. ISSN 0142-9418

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Mixed-mode delamination is one of the common failures of composites which has not been studied under low-impact loading. This paper studies the influence of displacement rate on mixed-mode I/II delamination of unidirectional carbon/epoxy composites. Single leg bending test is performed at displacement rates of 1, 10, 100, and 500 mm/min. Experimental results reveal that the mixed-mode I/II fracture toughness is invariant with the displacement rate. In addition, scanning electron micrographs shows that shear cusps are more obvious at 1, 10, and 100 mm/min. At 500 mm/min, significant matrix debris is noticed. Furthermore, the proposed three-dimensional rate-dependent fracture criterion is found to well predict the fracture toughness. Numerical simulation using cohesive zone model suggests that the lower numerical peak load is due to lower damage dissipated energy. In addition, the theoretical and numerical traction-separation responses show significant differences, which is also reflected in the numerical phase angle. This implies that the local mixed-mode ratio is not constant throughout the simulation process.

Item Type: Article
Uncontrolled Keywords: Carbon/epoxy composite, Rate dependence, Mixed-mode delamination, Fractography, Cohesive zone modelling
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3001-3521 Distribution or transmission of electric power
Divisions: Faculty of Engineering and Technology (FET)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 03 Mar 2022 01:28
Last Modified: 03 Mar 2022 01:28
URII: http://shdl.mmu.edu.my/id/eprint/10004


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