114 Bearing Failure Detection of Bolted Composite Joints Using Electric Resistance Change Method

概要

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Mechanically fastened joints are widely used for composite structures. Damage in bolted joints occurs by bearing load. It is difficult to detect the bearing failure using conventional nondestructive inspection methods, such as C-scan and X-ray inspection, because laps and washers hide the bearing failure area. Additionally these nondestructive inspection procedures are usually expensive, cumbersome, and time-consuming. In order to detect the bearing failure easily, the electric resistance change method is applied to bolted composite joints. Since a carbon fiber reinforced composite has strong anisotropy of electric resistance, electrodes are mountable away from holes. The electric resistance change alarms occurrence of the bearing failure at the hole. In this study, the electric resistance changes are measured experimentally during the tensile tests. The failure propagation is observed by a microscope and C-scan inspection. As a result, it is shown that the bearing failure of bolted composite joints is detectable by the proposed method.
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