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Effects of moisture absorption on the different modes of carbon/epoxy composites delamination

Johar, M. and Chong, W. W. F. and Kang, H. S. and Wong, K. J. (2019) Effects of moisture absorption on the different modes of carbon/epoxy composites delamination. Polymer Degradation and Stability, 165 . pp. 117-125. ISSN 0141-3910

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Official URL: http://dx.doi.org/10.1016/j.polymdegradstab.2019.0...


It is essential that moisture attack be considered when characterising interlaminar fracture toughness. However, limited work has been reported on the correlation between interlaminar fracture toughness of mixed mode I/II ratios and moisture content. Therefore, the present study aims to characterise the delamination of carbon/epoxy composites, immersed in distilled water at constant 70 °C. The specimens are tested at various water absorption levels using mode I, mode II and mixed-mode I/II loading configurations. The results revealed that mode I fracture toughness is insensitive to the moisture attack. However, approximately 50% drop in mode II and mixed-mode I/II fracture toughness are observed at high moisture content levels. Fibre bridging is also found in all wet specimens with an increment of up to 60–100% in fracture energy being observed for the tested water absorption levels. Upon water exposure, fractured surfaces are also found to possess a more porous matrix with a more significant fibre/matrix interface debonding. Through the study, a new three-dimensional criterion is proposed to characterise the variation of fracture toughness with both mode ratio and moisture content. The criterion is expected to allow for a better fundamental understanding with respect to the extent of moisture attack towards delamination of composite materials.

Item Type:Article
Uncontrolled Keywords:r-curve, scanning electron micrograph, water absorption
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:88325
Deposited By: Yanti Mohd Shah
Deposited On:15 Dec 2020 07:58
Last Modified:15 Dec 2020 07:58

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