Investigation of interfacial stiffnesses of a tri-layer using Zero-Group Velocity Lamb modes
Investigation of interfacial stiffnesses of a tri-layer using Zero-Group Velocity Lamb modes
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DOI：
10.1121/1.4934958
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发表时间：
2015-11-01
影响因子：
2.4
通讯作者：
Prada, Claire
中科院分区：
文献类型：
--
作者：
Mezil, Sylvain;Bruno, Francois;Prada, Claire
本文研究了由两板粘接而成的结构中的零群速度（ZGV）兰姆波。计算了Duralumin/epoxy/Duralumin样本的分散曲线，其中粘附力通过两个界面处的法向和切向弹簧建模。几个ZGV模式被确定和它们的频率依赖于界面刚度和粘结层厚度进行了数值研究。然后，激光超声技术实现的实验。局部共振测量使用叠加源和探头。知道的厚度和弹性常数的硬铝和环氧树脂层，理论和实验ZGV共振之间的比较导致的界面刚度的评估。与理论色散曲线的良好一致性证实了共振和参数估计的识别。这种非接触技术是有前途的局部评价的粘接结构。(C)2015年美国声学学会。
Zero-Group Velocity (ZGV) Lamb waves are studied in a structure composed of two plates bonded by an adhesive layer. The dispersion curves are calculated for a Duralumin/epoxy/Duralumin sample, where the adhesion is modeled by a normal and a tangential spring at both interfaces. Several ZGV modes are identified and their frequency dependence on interfacial stiffnesses and on the bonding layer thickness is numerically studied. Then, experiments achieved with laser ultrasonic techniques are presented. Local resonances are measured using a superimposed source and probe. Knowing the thicknesses and elastic constants of the Duralumin and epoxy layers, the comparison between theoretical and experimental ZGV resonances leads to an evaluation of the interfacial stiffnesses. A good agreement with theoretical dispersion curves confirms the identification of the resonances and the parameter estimations. This non-contact technique is promising for the local evaluation of bonded structures. (C) 2015 Acoustical Society of America.