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Lamb wave near field enhancements for surface breaking defects in plates
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Clough, A. R. and Edwards, R. S. (Rachel S.). (2012) Lamb wave near field enhancements for surface breaking defects in plates. Journal of Applied Physics, Vol.111 (No.10). p. 104906. ISSN 0021-8979
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WRAP_edwards_101012-japsubmitted_clough_edwards.pdf - Accepted Version Download (1210Kb) | Preview |
Official URL: http://dx.doi.org/10.1063/1.4719983
Abstract
Near field surface wave ultrasonic enhancements have previously been used to detect surface breaking defects in thick samples using Rayleigh waves. Here, we present analogous surface wave enhancements for Lamb waves propagating in plates. By tracking frequency intensities in selected regions of time-frequency representations, we observe frequency enhancement in the near field, due to constructive interference of the incident wave mode with those reflected and mode converted at the defect. This is explained using two test models; a square based notch and an opening crack, which are used to predict the contribution to the out-of-plane displacement from the reflected and mode converted waves. This method has the potential to provide a reliable method for the near field identification and characterisation of surface breaking defects in plates.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Lamb waves, Surfaces (Technology) -- Defects |
| Journal or Publication Title: | Journal of Applied Physics |
| Publisher: | American Institute of Physics |
| ISSN: | 0021-8979 |
| Date: | 2012 |
| Volume: | Vol.111 |
| Number: | No.10 |
| Page Range: | p. 104906 |
| Identification Number: | 10.1063/1.4719983 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | European Research Council (ERC) |
| Grant number: | 202735 (ERC) |
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| URI: | http://wrap.warwick.ac.uk/id/eprint/50480 |
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