Effects of mixed-mode ratio and step-shaped micro pattern surface on crack-propagation resistance of carbon-fiber-reinforced plastic/adhesive interface |
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| Affiliation: | 1. Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan;2. Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I1-58, O-okayama, Meguro, Tokyo 152-8552, Japan;1. Tampere University of Technology, Department of Materials Science, P.O. Box 589, FI-33101 Tampere, Finland;2. Outotec Research Center, P.O. Box 69, FI-28101 Pori, Finland;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China;2. The Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 201899, PR China;1. Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow, Scotland;2. Weir Engineering Services, Oil and Gas Division, East Kilbride, Glasgow, Scotland |
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| Abstract: | This study investigated the effects of the mixed-mode ratio of applied loads (GII/G) and aspect ratio A of step-shaped micro patterns on the crack-propagation resistance of a carbon-fiber-reinforced plastic (CFRP)/adhesive interface fabricated by in-mold surface modification. Experiments showed that the fracture behaviors change and that the apparent mixed mode fracture toughness GC increases with GII/G and A. We used the Benzeggagh–Kenane (B–K) failure criterion for the mixed-mode fracture toughness considering the transition of the failure mode of the step-shaped micro patterns. The B–K criterion agreed well with the improvement of GC due to an increase in GII/G for various fixed values of A. We clarified the relationship between the aspect ratio A and the parameter η, which is required to describe the B–K criterion, and therefore, η can be estimated from A. Consequently, it was verified that GC of the CFRP/adhesive interface with step-shaped micro patterns can be predicted for arbitrary GII/G and A values by substituting the η–A relationship in the B–K criterion. |
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| Keywords: | B Adhesion B Fracture toughness B Microstructure E Surface treatments |
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