Title: Full elastic characterization of absorpitve rubber using laser excited guided ultrasonic waves
Authors: Verstraeten, Bert
Xu, Xiaodong
Martinez, Loïc
Glorieux, Christ
Issue Date: 2012
Publisher: AIP Conference Proceedings
Host Document: INTERNATIONAL CONGRESS ON ULTRASONICS (GDANSK 2011) vol:1433 pages:423-426
Conference: ICU location:Gdansk date:5-8 September 2011
Article number: 423
Abstract: Because of the highly damping nature of rubber, it is difficult to characterize its dynamic elastic properties
using classical methods. In this paper, an experimental approach employing laser excited guided acoustic waves is
proposed to accurately determine the real and imaginary part of the longitudinal and shear elastic modulus of a rubber
layer. From the spatiotemporal evolution of a propagating laser excited Lamb wave measured by a laser Doppler
vibrometer, which is scanning along a line perpendicular to a line of excitation, the phase velocity dispersion curves in
the wave number - frequency domain are obtained. The results are interpreted in the framework of a detailed semianalytical
study, analyzing the influence of elastic damping on the Lamb dispersion curves. This analysis is exploited to
adequately fit the experimental dispersion curves and thus extract information about the elastic moduli and absorption
coefficients of the rubber plate. The results are validated by a pulse-echo measurement, and by guided wave propagation
results with the rubber layer connected in a bi-layer plate configuration to non-damping plates.
ISBN: 978-0-7354-1019-0
ISSN: 0094-243X
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Soft Matter and Biophysics

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