J0402-3-1 広帯域ラム波のモード変換による周波数分散性変化を利用した複合材料中の剥離損傷検知([J0402-3]超音波計測・解析法の新展開(3))

概要

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The authors have constructed a broadband ultrasonic propagation system using MFC actuators and FBG sensors. These components can be integrated into composite laminates. In this research, we used this system to detect delamination damage in a CFRP quasi-isotropic laminate. First, we identified the multiple modes of Lamb waves in the laminate by transmitting and receiving the symmetric and antisymmetric modes separately. Then the mode conversions at both tips of a delamination were investigated. After that, we proposed a new delamination detection method based on mode conversions and carried out experiments on laminates with an artificial delamination. The frequency dispersions of the received modes changed depending on the delamination length owing to the mode conversions. Since these phenomena were also confirmed by FEA, our new method is effective in detecting a delamination in CFRP laminates.
一般社団法人日本機械学会の論文
2010-09-04