J044013 伝播する広帯域ラム波のモード変換を利用したCFRP接着構造の剥がれ損傷モニタリング([J04401]知的材料・構造システム(1))

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 second step in this study, propagation tests using specimens, in which a 180Lx25WX3.4T mm3 strip laminate was bonded on a 180Lx6Owx3.41. mm3 skin panel to simulate the skin-stringer bonding structure, were carried out. In the tests, broadband Lamb waves were propagated in the laminate by separating S and A modes using the two MFCs and two FBGs. Through the tests, the relationship between the changes of the modal dispersion characteristics and the debonding lengths were investigated in detail. As a result, it was demonstrated that the debonding damage will be detected by using the mode conversion from Al to So, which were observed by this propagation system.
一般社団法人日本機械学会の論文
2011-09-11