組込型広帯域ラム波送受振システムによるCFRP接着構造の剥がれ損傷検知

概要

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As one of the structural health monitoring systems, the authors developed a broadband ultrasonic propagation system using a macro fiber composite (MFC) actuator and a fiber Bragg grating (FBG) sensor. This system can send and receive broadband Lamb waves efficiently in a specific direction, and the MFC and FBG can be integrated into composite laminates because of their flexibility and high fracture strain. Then this system was applied to detect the debonding in a carbon fiber reinforced plastic (CFRP) bonded structure. In order to utilize the changes in the dispersion characteristic and the path length of Lamb waves due to debonding, the experiment of broadband ultrasonic propagation was conducted under some different conditions. As a result, the frequency dispersion of Lamb waves changed with an increase in the debonding length and the tendency of the dispersion change depended on the conditions of the frequency range and the sensor position. Hence these changes were evaluated quantitatively by the extraction of the arrival time and the amplitude of the maximum peak from the wavelet transformation result. These indexes were found to be effective to estimate the debonding length in the CFRP bonded structure.
2010-04-25