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Open AccessArticle

Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites

1
School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia
2
Faculty of Engineering and Science, Curtin University Malaysia, Miri 98009, Malaysia
3
Institute for Nanomaterials, Advanced Technologies and Innovation (CXI), Technical University of Liberec (TUL), Studentska 2, 461 17 Liberec, Czech Republic
4
Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(9), 2162; https://doi.org/10.3390/polym12092162
Received: 1 September 2020 / Revised: 16 September 2020 / Accepted: 19 September 2020 / Published: 22 September 2020
(This article belongs to the Special Issue Damage Mechanics of Polymer Composites)
It is necessary to consider the influence of moisture damage on the interlaminar fracture toughness for composite structures that are used for outdoor applications. However, the studies on the progressive variation of the fracture toughness as a function of moisture content M (%) is rather limited. In this regard, this study focuses on the characterization of mode II delamination of carbon/epoxy composites conditioned at 70 °C/85% relative humidity (RH). End-notched flexure test is conducted for specimens aged at various moisture absorption levels. Experimental results reveal that mode II fracture toughness degrades with the moisture content, with a maximum of 23% decrement. A residual property model is used to predict the variation of the fracture toughness with the moisture content. Through numerical simulations, it is found that the approaches used to estimate the lamina and cohesive properties are suitable to obtain reliable simulation results. In addition, the damage initiation is noticed during the early loading stage; however, the complete damage is only observed when the numerical peak load is achieved. Results from the present research could serve as guidelines to predict the residual properties and simulate the mode II delamination behavior under moisture attack. View Full-Text
Keywords: carbon/epoxy composite; moisture absorption; Fickian; delamination; fracture toughness; cohesive zone modeling carbon/epoxy composite; moisture absorption; Fickian; delamination; fracture toughness; cohesive zone modeling
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MDPI and ACS Style

Wong, K.J.; Johar, M.; Koloor, S.S.R.; Petrů, M.; Tamin, M.N. Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites. Polymers 2020, 12, 2162.

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