A unified framework for linear thermo-visco-elastic wave propagation including the effects of stress-relaxation
journal contributionposted on 2022-10-25, 10:27 authored by Erik García Neefjes, David Nigro, Artur L Gower, Raphaël C Assier, Valerie PinfieldValerie Pinfield, William J Parnell
We present a unified framework for the study of wave propagation in homogeneous linear thermo-visco-elastic (TVE) continua, starting from conservation laws. In free-space such media admit two thermo-compressional modes and a shear mode. We provide asymptotic approximations to the corresponding wavenumbers which facilitate the understanding of dispersion of these modes, and consider common solids and fluids as well as soft materials where creep compliance and stress relaxation are important. We further illustrate how commonly used simpler acoustic/elastic dissipative theories can be derived via particular limits of this framework. Consequently, our framework allows us to: (i) simultaneously model interfaces involving both fluids and solids and (ii) easily quantify the influence of thermal or viscous losses in a given configuration of interest. As an example, the general framework is appliedto the canonical problem of scattering from an interface between two TVE half spaces in perfect contact. To illustrate, we provide results for fluid-solid interfaces involving air, water, steel and rubber, paying particular attention to the effects of stress relaxation.
Ultrasonic propagation in complex media: correlated spatial distributions and multiple dispersed phases
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- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering
Published inProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
- VoR (Version of Record)
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Publisher statementThis is an Open Access Article. It is published by the Royal Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/