The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface.
The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface.
复制标题
测量 A0 和 S0 兰姆波衰减以确定压缩载荷界面的法向刚度和剪切刚度。
DOI：
10.1121/1.1568754
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
B. Hosten
中科院分区：
文献类型：
--
作者：
B. Drinkwater;M. Castaings;B. Hosten
导波在被空气包围的弹性板中以很低的衰减传播。本文描述了在弹性板的一个表面上压缩加载具有高内耗的弹性体对这种传播的影响。同时考虑了A0和S0兰姆模的传播。主要的影响是导波的衰减增加。这种衰减是由于能量从平板泄漏到弹性体中，在那里由于高粘弹性阻尼而耗散。结果表明，衰减的增加强烈地依赖于施加在固-固界面上的压缩载荷。在系统的连续介质模型中，该界面被表示为弹簧层。界面的法向和剪切刚度都是通过在压缩加载的每个阶段测量的A0和S0兰姆波的衰减来量化的。正常硬度也可通过垂直入射的整体纵波超声独立测量。由该模型得到的波传播行为的预测结果，如衰减，与实验测量的结果非常吻合。
Guided waves in an elastic plate surrounded by air propagate with very low attenuation. This paper describes the effect on this propagation of compressively loading an elastomer with high internal damping against one surface of the elastic plate. The propagation of both A0 and S0 Lamb modes is considered. The principal effect is shown to be increased attenuation of the guided waves. This attenuation is caused by leakage of energy from the plate into the elastomer, where it is dissipated due to high viscoelastic damping. It is shown that the increase in attenuation is strongly dependent on the compressive load applied across the solid-solid interface. This interface is represented as a spring layer in a continuum model of the system. Both normal and shear stiffnesses of the interface are quantified from the attenuation of A0 and S0 Lamb waves measured at each step of the compressive loading. The normal stiffness is also measured independently by normal incidence, bulk longitudinal wave ultrasound. The resulting predictions of wave propagation behavior, such as attenuation, obtained by the model are in excellent agreement with those measured experimentally.