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Interface delamination of layered media: acoustic spectroscopy and modal analysis

机译:分层介质的界面分层:声学光谱和模态分析

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We have developed a method of resonance ultrasound spectroscopy (RUS) to study the acoustic spectral response to interface delamination in a triple-layered rectangular parallelepiped [Al (aluminum) /polymer/ Al]. Combination of laser-Doppler interferometry and the Rayleigh-Ritz approximation affected mode identification in the measured resonance spectrum. Point-contact RUS is capable of sensing a minute delamination (1.5% of total area). Modal analysis using a number of resonance modes can deduce the delamination area and location in the interface. Not only screening but also defect characterization is possible. At the same time, some resonance modes are totally insensitive to an interface imperfection. These modes are found to have virtually no strain energy arising from the bonding layer.
机译:我们开发了一种共振超声光谱法(RUS),以研究声波对三层长方体[Al(铝)/聚合物/ Al]中的界面分层的响应。激光多普勒干涉测量法和瑞利-里兹近似法的组合会影响所测谐振谱中的模式识别。点接触RUS能够感应微小的分层(占总面积的1.5%)。使用多种共振模式的模态分析可以推论界面中的分层区域和位置。不仅可以筛选,而且可以表征缺陷。同时,某些共振模式对界面缺陷完全不敏感。发现这些模式实际上没有从结合层产生的应变能。

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