Kubrusly, Alan C., Tovar, Pedro, von der Weid, Jean Pierre and Dixon, Steve M. (2021) Mode conversion of SH guided waves with symmetry inversion in plates. Ultrasonics, 112 . 106334. doi:10.1016/j.ultras.2020.106334 ISSN 0041-624X.
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Abstract
When shear horizontal ultrasonic guided waves interact with thickness discontinuities in plates, the reflected and transmitted wavefields can be composed of several modes due to mode conversion. It is known that in a plate with a symmetric discontinuity, with respect to the plate’s mid-plane, mode conversion is restricted to modes that share the same symmetry as the incident mode. In this paper, we use an analytical model based on the reciprocity principle and finite element analysis to investigate mode conversion due to the interaction with different types of discontinuity, namely, non-symmetric, symmetric and geometrically symmetric but with opposite boundary conditions, that is one side of the discontinuity free and the other rigidly fixed. We show that the reflected field due to interaction with the latter is virtually restricted to modes with the opposite symmetry of the incident one, acting as a symmetry inverter discontinuity. Unlike fully symmetric discontinuities, the effectiveness of a symmetry inverter discontinuity depends on the frequency. This was proved with aid of the analytical model for a full-depth discontinuity and verified for partial depth discontinuities. Finally, symmetry inversion of SH waves was experimentally verified in acrylic plates which were symmetrically machined and filled with steel in one side to mimic a fixed boundary condition.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics |
| Library of Congress Subject Headings (LCSH): | Shear waves, Waves -- Diffraction , Ultrasonic waves |
| Journal or Publication Title: | Ultrasonics |
| Publisher: | Elsevier Science BV |
| ISSN: | 0041-624X |
| Official Date: | April 2021 |
| Dates: | Date Event April 2021 Published 24 December 2020 Available 2 December 2020 Accepted |
| Volume: | 112 |
| Article Number: | 106334 |
| DOI: | 10.1016/j.ultras.2020.106334 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Date of first compliant deposit: | 8 January 2021 |
| Date of first compliant Open Access: | 24 December 2021 |
| RIOXX Funder/Project Grant: | Project/Grant ID RIOXX Funder Name Funder ID Finance Code 001 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior UNSPECIFIED Conselho Nacional de Desenvolvimento Científico e Tecnológico |
| URI: | https://wrap.warwick.ac.uk/146910/ |
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