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Updated: May 29, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Elastic weakening of a dense granular pack by acoustic fluidization: slipping, compaction, and aging
1Université Paris-Est, Laboratoire de Physique des Milieux Divisés et Interfaces, CNRS FRE 3300, 5 Boulevard Descartes, F-77454 Marne-la-Vallée, France. jia@univ-mlv.fr
Abstract:
Sound velocity measurements in dense glass bead packs reveal significant softening effect at large amplitudes, due to the frictional nonlinearity at the grain contacts. Beyond a certain amplitude, the sound-matter interaction becomes irreversible, leaving the medium in a weakened and slightly compacted state. A slow recovery of the initial elastic modulus is observed after acoustic perturbation, revealing the plastic creep growth of microcontacts. The cross-correlation function of configuration-specific acoustic speckles highlights the relationship between the macroscopic elastic weakening and the local change of the contact networks, induced by strong sound vibration, in the absence of appreciable grain motion.
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