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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
Published on: June 28, 2024
Reflection and transmission coefficients for guided waves reflected by defects in viscoelastic material plates
Bernard Hosten1, Ludovic Moreau, Michel Castaings
1Laboratoire de Mécanique Physique, Université Bordeaux 1, UMR C.N.R.S. 5469 351 cours de la Libération, 33405 Talence Cedex, France. b.hosten@lmp.u-bordeauxl.fr
Abstract:
The paper presents a Fourier transform-based signal processing procedure for quantifying the reflection and transmission coefficients and mode conversion of guided waves diffracted by defects in plates made of viscoelastic materials. The case of the S(0) Lamb wave mode incident on a notch in a Perspex plate is considered. The procedure is applied to numerical data produced by a finite element code that simulates the propagation of attenuated guided modes and their diffraction by the notch, including mode conversion. Its validity and precision are checked by the way of the energy balance computation and by comparison with results obtained using an orthogonality relation-based processing method.
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