J0405-1-3 広帯域ラム波の分散特性を利用した複合材料構造中の剥離損傷検知(知的材料・構造システム(1) 複合材料関連)

概要

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The authors developed a broadband Lamb wave propagation system using a macro fiber composite (MFC) actuator and fiber Bragg grating (FBG) sensors. One MFC is bonded on the top surface of a CFRP quasi-isotropic laminate with the thickness of 3.4mm and generates broadband Lamb waves in the range from 0Hz to 1200kHz. Then two FBGs bonded on the both surfaces of the laminate receive the propagated waves. By applying the wavelet transform to the superimposed waves or subtracted waves received in the two FBGs, we could identify S_0, S_1, A_0, and A_1 modes clearly. After that, an artificial delamination was induced in the laminate, and the waves were propagated through the delaminated area. As a result, the amplitudes of the S_1 and A_1 modes decreased with an increase in the delamination length, because the dispersion characteristic changes in the delaminated area due to the thickness change. Hence the delamination length was able to be evaluated from the amplitude ratios between the different order modes.
2009-09-12