Title :
Deviation of a monochromatic Lamb wave beam in anisotropic multilayered media: asymptotic analysis, numerical and experimental results
Author :
Potel, Catherine ; Baly, Stéphane ; De Belleval, Jean-François ; Lowe, Mike ; Gatignol, Philippe
Author_Institution :
Lab. d´´Acoustique de l´´Universite du Maine, Maine Univ., Le Mans, France
fDate :
6/1/2005 12:00:00 AM
Abstract :
The aim of this paper is threefold: to describe the physical phenomenon of the excitation of modal waves such as Lamb waves, in anisotropic multilayered media, by a monochromatic incident beam, using an asymptotic approach; to present a three-dimensional model using the decomposition of the incident beam into monochromatic plane waves (the formalism is applied to the particle displacement vector); to illustrate the phenomenon both numerically and experimentally. Numerical and experimental maps of the reflected field of pressure are presented, and the reradiation of the Lamb wave beam in an oblique plane is theoretically and numerically illustrated.
Keywords :
surface acoustic waves; ultrasonics; Lamb waves; anisotropic multilayered media; asymptotic analysis; beam reradiation; modal waves excitation; monochromatic beam; monochromatic incident beam; monochromatic plane waves; particle displacement vector; pressure reflected field; three-dimensional model; Acoustic beams; Anisotropic magnetoresistance; Composite materials; Inspection; Manufacturing; Materials testing; Monitoring; Optical fiber testing; Particle beams; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2005.1504021