3214 繰返し荷重負荷状況下におけるCFRP積層板の電気抵抗変化を用いた損傷検知(J06-4 損傷検知・診断,J06 知的材料・構造システム)

概要

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For Carbon Fiber Reinforced Plastic (CFRP), electrical conductivity of carbon fiber can be used as a sensor for damage detection. The change of electrical resistance of the CFRP structure has been studied as a self-sensing system for monitoring damages. Todoroki et al. reported that the electrical resistance change method successfully monitored various damages like matrix cracking, fiber breakage and delamination in CFRP laminates. To apply the electrical resistance change method to practical structures, reliability of the electrodes is a key issue. This paper contains the investigation of the reliability of the electrodes under cyclic load. The specimen for this experiment was made of unidirectional CFRP prepreg that was used for the aircraft and aerospace structures (180℃ cure prepreg). And the electrodes were bonded to CFRP surface by using copper plating after polishing of the specimen surface with sandpaper and treating with sulfuric acid solution and hydrogen peroxide solution to remove the surface resin. Volume fraction of specimens used for the fatigue test was almost 65%. Fatigue tests were carried out using a servo-hydraulic testing system. As a result, the electrodes had a fatigue life at the same level as the conventional strain gages under cyclic load.
一般社団法人日本機械学会の論文
2006-09-15