Elastic wave propagation in a three-dimensional periodic granular mediumJ. Anfosso1 and V. Gibiat2
1 Laboratoire Ondes et Acoustique, UMR 7587, Université Paris VII Denis Diderot ESPCI - 10 rue Vauquelin, 75231 Paris, France
2 Laboratoire d'Acoustique de Métrologie et d'Instrumentation, Université Paul Sabatier 118 route de Narbonne, 31062 Toulouse Cedex, France
(Received 12 January 2004; accepted in final form 1 June 2004)
We present an experimental study of acoustic wave propagation in granular media made of mono-disperse spherical beads under stress and periodically arranged. A previous work presented the predominance of multiple-scattered acoustic waves for random closed-packing granular media, whereas our experimental results lead to the conclusion that the acoustical propagation in our arrangement of spherical beads proceeds essentially from surface waves. This provides another mechanism for the understanding of acoustical wave propagation in granular media, that may be useful at least to analyse weak disorder ones.
45.70.-n - Granular systems.
43.35.+d - Ultrasonics, quantum acoustics, and physical effects of sound.
46.40.Cd - Mechanical wave propagation (including diffraction, scattering, and dispersion).
© EDP Sciences 2004