非破壊検査
Print ISSN : 0367-5866
レーザ励起ガイド波の分散関係に基づくハニカムサンドイッチ構造のはく離検出
齋藤 理陳 偉堃董 澤宇岡部 洋二
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ジャーナル フリー

2024 年 73 巻 2 号 p. 85-92

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Using the laser-ultrasonic visualizing technique, we attempt to detect the delamination of a honeycomb sandwich structure based on the change in dispersive property. By replacing the honeycomb core with an equivalent homogenized layer, a three-layer model of the honeycomb sandwich structure can be constructed. Then, the dispersion relation of the guided waves can be derived and it was found that the wavenumber of A0 mode increases on the delamination region. Moreover, by scanning the laser on a specimen with artificial delamination, the guided waves were received by a PZT sensor. Then, the two-dimensional wavenumber map was derived by taking the ratio of Fourier spectrum between the adjoint data points. As a result, it is shown that the delamination can be detected based on the enhancement of the wavenumber. In addition, since the cell wall is clearly visible in the intact region on the wavenumber map, the delamination can be detected based on the disappearance of the cell wall.

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