Self-sensing time-domain reflectometry for detection of the bearing failure of a CFRP laminate fastener hole: effect of peeling of the insulator |
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| Authors: | Akira Todoroki Keisuke Ohara Yoshihiro Mizutani Yoshiro Suzuki Ryosuke Matsuzaki |
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| Affiliation: | 1. Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro, Tokyo 1528550, Japan;2. Graduate student, Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro, Tokyo 1528550, Japan;3. Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan |
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| Abstract: | Carbon-fiber-reinforced polymer (CFRP) composites are used in aerospace and automobile structures. For many CFRP structures, mechanical metallic fasteners are adopted. In internal structures such as a wing box, damage to CFRP structures around the fastener holes is difficult to see. A simple method of finding damage around fastener holes is thus required for CFRP structures. This study applies self-sensing time-domain reflectometry to detect bearing failure around fastener holes of CFRP structures. In a previous paper, the effect of fasteners was minimized when the micro-strip line (MSL) was placed apart from the fasteners. This study numerically and experimentally investigates the peeling of glass-fiber-reinforced polymer (GFRP) insulator. A bearing failure results in embossing at the edge of a fastener hole. The embossing produces a wedge that causes the peeling of GFRP, generating a gap between the GFRP and CFRP. The gap strongly affects the characteristic impedance of the MSL. |
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| Keywords: | composites time-domain reflectometry self-sensing bearing failure fasteners monitoring |
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