J0404-5-1 組込型超音波送受振デバイスを用いた広帯域ラム波の伝播によるCFRP接着構造の剥がれ損傷モニタリング([J0404-5]知的材料・構造システム(5):損傷検知・診断・モニタリングIII)

概要

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A broadband ultrasonic wave propagation system had been already developed, in which a macro fiber composite (MFC) actuator and fiber Bragg grating (FBG) sensors were used because of their thinness and high fracture strain. A structural health monitoring technique using the broadband ultrasonic wave propagation system was proposed to detect debondings in carbon fiber reinforced plastic (CFRP) bonding structures. In the technique, the debondings were detected by using changes in modal dispersions of received Lamb waves propagated through the debonding. As the first step in this study, propagation tests using specimens, in which a 180^L×60^W×3.4^T mm CFRP plate was bonded to a 180^L×25^W×3.4^T mm CFRP plate to simulate a skin-stringer bonded structure, were carried out. In the tests, the changes in the modal dispersions corresponding to various propagation lengths, CFRP plate thicknesses, and debonding lengths, were circumstantially investigated. Thorough the tests, the feasibility of the structural health monitoring technique using the broadband ultrasonic wave propagation system for the debonding detection was demonstrated.
一般社団法人日本機械学会の論文
2010-09-04