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http://dx.doi.org/10.5139/IJASS.2013.14.4.350

Fatigue damage detection of CFRP using the electrical resistance change method  

Todoroki, Akira (Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology)
Mizutani, Yoshihiro (Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology)
Suzuki, Yoshiro (Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology)
Haruyama, Daichi (Graduate student of Tokyo Institute of Technology, Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology)
Publication Information
International Journal of Aeronautical and Space Sciences / v.14, no.4, 2013 , pp. 350-355 More about this Journal
Abstract
Electrical resistance change measurements were performed, to detect fatigue damage of a quasi-isotropic CFRP and cross-ply CFRP laminates. A four-probe method was used to measure the exact electrical resistance change. A three-probe method was used to measure the electrical contact resistance change, during long cyclic loading. The specimen side surface was observed using a video-microscope to detect damage. The measured electrical resistance changes were compared with the observed damage. The results of this study show that the electrical resistance increase of the quasi-isotropic laminate was caused by a delamination crack between ${\pm}45^{\circ}$ plies. Matrix cracking caused a small electrical resistance increase of the cross-ply laminate, but the decreased electrical resistance caused by the shear-plastic deformation impedes matrix-cracking detection.
Keywords
Composites; Electrical resistance; Carbon Fibers; Delamination;
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