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Random acousticmetamaterial with asubwavelength dipolarresonance M DuranteauTony Valier‐BrasierJean-Marc Conoir2016 год

Random acoustic metamaterial with a subwavelength dipolar resonance
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Аннотация: 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.
Год издания: 2016
Авторы: M Duranteau, Tony Valier‐Brasier, Jean-Marc Conoir, Régis Wunenburger
Издательство: Acoustical Society of America
Источник: The Journal of the Acoustical Society of America
Ключевые слова: Acoustic Wave Phenomena Research, Underwater Acoustics Research, Ultrasonics and Acoustic Wave Propagation
Другие ссылки: The Journal of the Acoustical Society of America (PDF)
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HAL (Le Centre pour la Communication Scientifique Directe) (PDF)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
PubMed (HTML)