The symmetry and coupling properties of solutions in general anisotropic multilayer waveguides

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Title: The symmetry and coupling properties of solutions in general anisotropic multilayer waveguides
Authors: Hernando Quintanilla, F
Lowe, MJ
Craster, RV
Item Type: Journal Article
Abstract: Multilayered plate and shell structures play an important role in many engineering settings where, for instance, coated pipes are commonplace such as in the petrochemical, aerospace, and power generation industries. There are numerous demands, and indeed requirements, on nondestructive evaluation (NDE) to detect defects or to measure material properties using guided waves; to choose the most suitable inspection approach, it is essential to know the properties of the guided wave solutions for any given multilayered system and this requires dispersion curves computed reliably, robustly, and accurately. Here, the circumstances are elucidated, and possible layer combinations, under which guided wave solutions, in multilayered systems composed of generally anisotropic layers in flat and cylindrical geometries, have specific properties of coupling and parity; the partial wave decomposition of the wave field is utilised to unravel the behaviour. A classification into five families is introduced and the authors claim that this is the fundamental way to approach generally anisotropic waveguides. This coupling and parity provides information to be used in the design of more efficient and robust dispersion curve tracing algorithms. A critical benefit is that the analysis enables the separation of solutions into categories for which dispersion curves do not cross; this allows the curves to be calculated simply and without ambiguity.
Issue Date: 19-Jan-2017
Date of Acceptance: 20-Dec-2016
ISSN: 0001-4966
Publisher: Acoustical Society of America
Journal / Book Title: Journal of the Acoustical Society of America
Volume: 141
Issue: 1
Copyright Statement: © 2017 Acoustica Society of America. The following article appeared in The Journal of the Acoustical Society of America 141, 406 (2017) and may be found at
Sponsor/Funder: Imperial College Trust
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: PC2508ICT
Keywords: Acoustics
MD Multidisciplinary
Publication Status: Published
Conference Place: United States
Article Number: 406
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences

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