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Surface acoustic waves confined to a soft layer between two stiff elastic quarter-spaces

  • Propagation of acoustic waves is considered in a system consisting of two stiff quarter-spaces connected by a planar soft layer. The two quarter-spaces and the layer form a half-space with a planar surface. In a numerical study, surface waves have been found and analyzed in this system with displacements that are localized not only at the surface, but also in the soft layer. In addition to thePropagation of acoustic waves is considered in a system consisting of two stiff quarter-spaces connected by a planar soft layer. The two quarter-spaces and the layer form a half-space with a planar surface. In a numerical study, surface waves have been found and analyzed in this system with displacements that are localized not only at the surface, but also in the soft layer. In addition to the semi-analytical finite element method, an alternative approach based on an expansion of the displacement field in a double series of Laguerre functions and Legendre polynomials has been applied. It is shown that a number of branches of the mode spectrum can be interpreted and remarkably well described by perturbation theory, where the zero-order modes are the wedge waves guided at a rectangular edge of the stiff quarter-spaces or waves guided at the edge of a soft plate with rigid surfaces. For elastic moduli and densities corresponding to the material combination PMMA–silicone–PMMA, at least one of the branches in the dispersion relation of surface waves trapped in the soft layer exhibits a zero-group velocity point. Potential applications of these 1D guided surface waves in non-destructive evaluation are discussed.show moreshow less

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Metadaten
Author:Pavel Dmitrievich PupyrevGND, Ilya Nedospasov, Elena Sokolova, Andreas MayerGND
Publisher:ScienceDirect
Date of Publication (online):2020/11/02
Language:English
Parent Title (English):Wave Motion
Volume:101
ISSN:0165-2125
First Page:102672-1
Last Page:102672-6
Document Type:Article (reviewed)
Institutes:Bibliografie
Open Access:Zugriffsbeschränkt
Release Date:2021/01/14
Licence (German):License LogoEs gilt das UrhG
Note:
Der Artikel ist seit 02.11.2020 online verfügbar.
DOI:https://doi.org/10.1016/j.wavemoti.2020.102672