Lamb waves in highly attenuative plastic plates
Lamb waves in highly attenuative plastic plates
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DOI：
10.1121/1.423332
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发表时间：
1998-08-01
影响因子：
2.4
通讯作者：
Cawley, P
中科院分区：
文献类型：
--
作者：
Chan, CW;Cawley, P
分析了材料衰减对兰姆波频散特性的影响。随着衰减的增加，保持体纵向剪切波衰减的比例恒定在高密度聚乙烯中测量的值，剪切波和纵向分波之间的耦合程度降低，相同对称性的不同模式的相速度色散曲线可以交叉;这对于弹性板是不可能的。随着衰减的增加，一些模式在高频下变得渐近于体纵向速度，而不是体剪切速度。在高的衰减值，有最小的耦合之间的纵向和剪切分波和纵向模式的行为是类似的“流体板。“预测的群速度和衰减的高密度聚乙烯板中选定的模式已经检查实验，并获得良好的协议。(C)1998年美国声学学会。[S0001 - 4966（98）02508 - 9]。
The influence of material attenuation on Lamb wave dispersion behavior has been studied analytically. As the attenuation is increased, keeping the ratio of the bulk longitudinal to bulk sheer wave attenuation constant at the value measured in high-density polyethylene, the degree of coupling between the shear and longitudinal partial waves decreases and the phase velocity dispersion curves for different modes of the same symmetry can cross; this is not possible for an elastic plate. With increasing attenuation, some modes become asymptotic to the bulk longitudinal velocity at high frequency, rather than to the bulk shear velocity. At high values of attenuation, there is minimal coupling between the longitudinal and shear partial waves and the behavior of the longitudinal modes is analogous to that of a "fluid plate." The predicted group velocities and attenuations of selected modes in a high-density polyethylene plate have been checked experimentally, and good agreement was obtained. (C) 1998 Acoustical Society of America. [S0001-4966(98)02508-9].