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Mode selectivity of SH guided waves by dual excitation and reception applied to mode conversion analysis

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Kubrusly, Alan C., Freitas, Miguel A., von der Weid, Jean Pierre and Dixon, Steve M. (2018) Mode selectivity of SH guided waves by dual excitation and reception applied to mode conversion analysis. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 65 (7). 1239 -1249. doi:10.1109/TUFFC.2018.2835299 ISSN 1525-8955.

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Official URL: http://dx.doi.org/10.1109/TUFFC.2018.2835299

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Abstract

SH guided waves, generated by periodic permanent magnet arrays have been used previously in non-destructive evaluation of metal plates and pipes. When an SH guided wave interacts with a defect or change in sample thickness, the incident SH wave may undergo mode conversion. Analysis of mode conversion is complicated, due to the interference of several propagating modes in the received signal, that can often temporally overlap. This paper proposes a mode selection technique to help understand the interaction of SH guided waves with changes in sample thickness. Using an understanding of the propagation characteristics of the guided waves, SH guided waves are sequentially generated and detected on both surfaces of the plate, capturing four distinct waveforms. By superposition of the detected signals, symmetric modes can be clearly separated from antisymmetric modes in the processed, received signals. For this method to work well, the transducers used should have very similar responses and be precisely positioned on exactly opposite positions either side of the plate. Finite element simulations are also performed, mirroring the experimental measurements, and the results correlate well with the experimental observations made on an 8 mm thick plate with a region of simulated wall thinning machined into the sample.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Nondestructive testing, Sheet-metal -- Testing
Journal or Publication Title: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Publisher: IEEE
ISSN: 1525-8955
Official Date: July 2018
Dates:
DateEvent
July 2018Published
10 May 2018Available
10 May 2018Accepted
Volume: 65
Number: 7
Page Range: 1239 -1249
DOI: 10.1109/TUFFC.2018.2835299
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 14 June 2018
Date of first compliant Open Access: 14 June 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDConselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593

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