Low-frequency propagating and evanescent waves in high-contrast sandwich structures
1 : School of Computer Science and Mathematics, Keele University
2 : Faculty of Engineering Technology (ET), University of Twente
The presentation is concerned with elastic waves propagation in aerogel-based sandwich plates, characterised by a high contrast in geometric and mechanical parameters of the layers. A multiparametric approach is developed. It is demonstrated that due to a high contrast an additional low-frequency propagating wave and a slowly decaying evanescent one emerges. The link between them is investigated. Two-mode long-wave low-frequency asymptotic expansions of the full dispersion relation are derived. Comparison of the asymptotic results with the numerical solution of the full dispersion relation is presented.
| Subject : | : | oral |
| Topics | : | 6-3 - Dynamic and transient phenomena, dynamic phase transitions, nonlinear waves |
| PDF version | : |  PDF version |
