DURANTEAU, Mickaël; VALIER-BRASIER, Tony; CONOIR, Jean-Marc; WUNENBURGER, Régis

doi:10.1121/1.4950727

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DURANTEAU, Mickaël
Institut Jean Le Rond d'Alembert [DALEMBERT]

VALIER-BRASIER, Tony
Institut Jean Le Rond d'Alembert [DALEMBERT]

CONOIR, Jean-Marc
Institut Jean Le Rond d'Alembert [DALEMBERT]

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Ce document a été publié dans

Journal of the Acoustical Society of America. 2016-06, vol. 139, n° 6, p. 3341-3352

Acoustical Society of America

Résumé en anglais

The effective velocity and attenuation of longitudinal waves through random dispersions of rigid, tungsten-carbide beads in an elastic matrix made of epoxy resin in the range of beads volume fraction 2%-10% are determined experimentally. The multiple scattering model proposed by Luppé, Conoir, and Norris [J. Acoust. Soc. Am. 131(2), 1113-1120 (2012)], which fully takes into account the elastic nature of the matrix and the associated mode conversions, accurately describes the measurements. Theoretical calculations show that the rigid particles display a local, dipolar resonance which shares several features with Minnaert resonance of bubbly liquids and with the dipolar resonance of core-shell particles. Moreover, for the samples under study, the main cause of smoothing of the dipolar resonance of the scatterers and the associated variations of the effective mass density of the dispersions is elastic relaxation, i.e., the finite time required for the shear stresses associated to the translational motion of the scatterers to propagate through the matrix. It is shown that its influence is governed solely by the value of the particle to matrix mass density contrast.< Réduire

DOI

http://dx.doi.org/10.1121/1.4950727

Project ANR

Approche rationnelle pour la réalisation de métamatériaux pour l'acoustique ultrasonore

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Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798