On the reflection of coupled Rayleigh-like waves at surface defects in plates.

On the reflection of coupled Rayleigh-like waves at surface defects in plates. Research Abstract Details 

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On the reflection of coupled Rayleigh-like waves at surface defects in plates. Abstract Text:

Bernard Masserey,Paul Fromme,Bernard Masserey,Paul Fromme,Bernard Masserey,Paul Fromme,

The reflection of coupled Rayleigh-like waves from surface defects in elastic plates is investigated experimentally and analyzed on the basis of an analytical model and finite difference simulations. The propagation of Rayleigh-like waves in plates is characterized by an energy transfer to the opposite plate side and back over a distance called the beat length. Experimental results clearly show this beating effect and its dependency on the frequency-thickness product, and excellent agreement is obtained with existing analytical predictions. The propagation and scattering are modeled separately for the fundamental A(0) and S(0) Lamb modes that constitute the incident Rayleigh-like wave. The reflection coefficients from surface slots are investigated using finite difference simulations and the reflected Rayleigh-like wave is obtained by superposition. The theoretical model reveals strong dependencies of the reflected field on the ratio between excitation distance and beat length and on the cutoff frequencies of specific higher Lamb modes. Standard pulse-echo measurements allow for the detection of small defects from a remote transducer location. Good agreement is obtained between the predicted and measured amplitude spectra of the reflected Rayleigh-like wave. The developed model allows for the evaluation of defect location and damaged plate side using a combination of time-of-flight and frequency measurements.

On the reflection of coupled Rayleigh-like waves at surface defects in plates. Publishing Authors By Initials

B Masserey,P Fromme,B Masserey,P Fromme,B Masserey,P Fromme,

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On the reflection of coupled Rayleigh-like waves at surface defects in plates. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Journal of the Acoustical Society of America

VOLUME: 123

Page Numbers: 88-98

Journal Abbreviation: J. Acoust. Soc. Am.

ISSN: 1520-8524

DAY: 7

MONTH: Jan

YEAR: 2008

On the reflection of coupled Rayleigh-like waves at surface defects in plates. Information

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LANGUAGE: eng

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Grant and Affiliation Information for On the reflection of coupled Rayleigh-like waves at surface defects in plates.

AFFILIATION: Department of Mechanical Engineering, University College London, WC1E 7JE, United Kingdom.

Country: United States

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MEDLINETA: J Acoust Soc Am

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