The paper presents results of study of the elastic properties of fluid-saturated unconsolidated granular medium (FUGM). As a model of the media we used a system of densely packed metal balls with a diameter of 2 mm and 4 mm, the space between them was filled with liquids with different elastic properties - ethanol, glycerin and mineral motor oil SAE 10W-30. The influence of static (external pressure) and dynamic effects (the amplitude of the probe signal) on the linear and nonlinear elastic properties of FUGM. Linear elastic properties were investigated by pulse method, the nonlinear elastic properties of the medium were investigated by the spectral method. We experimentally investigated dependence of the velocity of elastic waves on the external pressure and the amplitude of the probe signal, and the amplitude of the second harmonic on the amplitude of the signal of fundamental frequency. The results were analyzed on the basis of the Hertz and Biot theory.
45.70.-n Granular systems
Department of Acoustics, Faculty of Physics, M.V.Lomonosov Moscow State University. Moscow 119991, Russia
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