Acoustic waves in granular materials


Mouraille, O. and Luding, S. (2007) Acoustic waves in granular materials. In: International Congress on Ultrasonics 2007, April 9-13, 2007, Vienna, Austria.

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Abstract:Dynamic simulations with discrete elements are used to obtain more insight into the wave propagation in dense granular media. A small perturbation is created on one side of a dense, static packing and examined during its propagation until it arrives at the opposite side. The influence of polydispersity is studied by randomly varying the particle sizes by a tiny amount. A size variation comparable to (or larger than) the typical contact deformation, considerably changes sound propagation, i.e., the transmission spectrum becomes discontinuous and lower frequencies are transmitted better in the polydisperse packing. The inter-particle friction affects the dispersion relation, it increases the propagation speed and leads to an extended linear, large wavelength regime.
Item Type:Conference or Workshop Item
Additional information:Paper ID 1752, Session S02: Nonlinear acoustics of granular media
Engineering Technology (CTW)
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