NDLI: Leakage and scattering of a leaky lamb wave by a structural discontinuity: Acousto-optics and FEM

Content Provider	IEEE Xplore Digital Library
Author	Kersemans, M. Van Paepegem, W. Van Den Abeele, K. Degrieck, J.
Copyright Year	2012
Description	Author affiliation: Dept. of Phys., Catholic Univ. of Leuven, Kortijk, Belgium (Van Den Abeele, K.) \|\| Dept. of Mater. Sci. & Eng., Ghent Univ., Zwijnaarde, Belgium (Kersemans, M.; Van Paepegem, W.; Degrieck, J.)
Abstract	This study focuses on the leakage and scattering phenomena of Lamb waves in liquids as the result of the insonification of the end of an immersed solid plate by means of a bounded ultrasonic beam at the Lamb angle. Both acousto-optics measurements and FEM simulations are presented and discussed. It is shown that the observed complex scattered field is composed of the leaking fields of mode-converted backward propagating Lamb waves. The geometrical position of the leakage indicates that the conversion process is completed very locally. On the other hand, it is observed that large zones of the immersion liquid become 'polluted' with scattered ultrasound. An analysis performed in the spatial frequency domain furthermore revealed the presence of a nonlinear interaction between multiple overlapping acoustic fields. Since real structures have limited spatial dimensions, the current results indicate a possible source of misinterpretation during water-coupled non-destructive testing (NDT).
Starting Page	735
Ending Page	738
File Size	2135188
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0183
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Solids Acoustics Finite element analysis Frequency-domain analysis Acoustic beams Fluids Scattering vertical edge Acousto-optics FEM leaky Lamb wave NDT
Content Type	Text
Resource Type	Article

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