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- W2001655333 abstract "This paper summarizes recent progress in wave propagation in fluid, elastic, and viscoelastic layers. This work finds application in underwater acoustics, NDT, geophysics, SAW devices, medical acoustics, etc. The role of absorption in viscoelastic layers can be accounted for by introducing complex propagation constants into elastic theories. This necessitates the need for four independent material constants, one of which (the shear loss) is difficult to obtain experimentally. This difficulty has been overcome by introducing a physical model relating the shear to longitudinal absorption. In the case of inhomogeneous layers (frequently encountered in practice) a theory which predicts effective material constants, including dynamic effects, is introduced. These constants can then be used in computer codes to calculate the transmission (T), reflection (R), and absorption coefficients for single and multiple layered configurations. The effect of finite thickness and fluid loading on the acoustic properties has recently been clarified by the application of the resonance theory which readily allows the interpretation of resonances in T and R. Resonance widths and amplitudes are modified by the presence of absorption loss, and the interaction between resonances accounts for an apparent violation of the coincidence rule in viscoelastic layers." @default.
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- W2001655333 title "Wave propagation in single and multiple visoelastic layers" @default.
- W2001655333 doi "https://doi.org/10.1121/1.2017147" @default.
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