Determination of the effective mechanical properties of inclusionary materials using bulk elastic waves

12th Anglo-French Physical Acoustics Conference

Lepert, G.^1,2 ; Aristégui, C.^1 ; Poncelet, O.^1 ; Brunet, T.^1 ; Audoly, C.^3 ; Parneix, P.^2

University of Bordeaux, CNRS, UMR 5295, cours de la Libération 351, 33405 Talence, France^1

DCNS Research, CEMIS, 83076 Toulon, France^2

DCNS Research, CESMAN, 44620 La Montagne, France^3

关键词: Complex-valued;    Effective mechanical properties;    Enhanced absorption;    Frequency dependent;    Homogeneous materials;    Natural materials;    Simultaneous determinations;    Temporal waveforms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/498/1/012007/pdf
DOI  :  10.1088/1742-6596/498/1/012007

来源: IOP

【 摘 要 】

For many years, the study of material with locally-resonant inclusions has known a great interest. Due to their attractive macroscopic acoustic properties, which do not exist in natural materials, many applications governed by the contrast between the constituent properties can be achieved: enhanced absorption, flat perfect lens, wave trapping... Such structures containing inclusions are usually modelled as effective homogeneous materials with complex-valued and frequency-dependent effective wave number and mass density. In this context, we derived a method for the simultaneous determination of both parameters using an immersed sample. First, its reliability is demonstrated using noisy synthesised temporal-waveform. Finally, the characterisation method is applied to experimental waveforms measured on a standard glass panel.