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Delamination crack detection is very important for improving the structural reliability of laminated compositestructures. This requires real-time delamination detection technologies. For composite laminates that are reinforced with carbonfiber, an electrical potential method uses carbon fiber for reinforcements and sensors at the same time. The use of carbon fiberfor sensors does not need to consider the strength reduction of smart structures induced by imbedding sensors into the structures.With carbon fiber reinforced (CF/) epoxy matrix composites, it had been proved that the delamination crack was detectedexperimentally. In the present study, therefore, similar experiments were conducted to prove the applicability of the method fordelamination crack detection of CF/polyetherethereketone matrix composite laminates. Mode I and mode II delamination testswith artificial cracks were conducted, and three point bending tests without artificial cracks were conducted. This studyexperimentally proves the applicability of the method for detection of delamination cracks. CF/polyetherethereketone materialhas strong electric resistance anisotropy. For CF/polyetherethereketone matrix composites, a carbon fiber network is constructed,and the network is broken by propagation of delamination cracks. This causes a change in the electric resistance of CF/polyetherethereketone matrix composites. Using three point bending specimens, delamination cracks generated without artificialinitial cracks is proved to be detectable using the electric potential method: This method successfully detected delaminationcracks.Key wordsdetection, electrical resistance, composites, carbon fiber, polyetherethereketone.

Detection of Delamination Crack for Polymer Matrix Composites with Carbon Fiber by Electric Potential Method