Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 81, Issue -, Pages 202-213Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.11.017
Keywords
Delamination; Environmental degradation; Cohesive interface modeling; Moisture
Funding
- Natural Science and Engineering Research Council of Canada
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An investigation of the effects of moisture on mixed-mode delamination growth in a carbon/epoxy composite is presented. Experimental quasi-static and fatigue delamination tests were carried out on composite specimens. The quasi-static fracture test results showed that exposure to moisture led to a decrease in mode II and mixed-mode delamination toughness while mode I toughness was enhanced. The fatigue tests revealed an adverse effect of moisture on delamination growth under mixed-mode loadings. Existing delamination criteria and growth rate models were evaluated to determine which ones best predict delamination toughness and growth, respectively, at any given mixed-mode ratio. Quasi-static and fatigue simulations with a cohesive zone-based finite element model that incorporated the selected mixed-mode delamination models were performed and good agreement between experimental and numerical data was shown for dry and moisture-exposed specimens. (C) 2015 Elsevier Ltd. All rights reserved.
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