Sound damping in frictionless granular materials: The interplay between configurational disorder and inelasticity

Abstract

We numerically investigate sound damping in a model of granular materials in two dimensions. We simulate evolution of standing waves in disordered frictionless disks and analyze their damped oscillations by velocity autocorrelation functions and power spectra. We control the strength of inelastic interactions between the disks in contact to examine the effect of energy dissipation on sound characteristics of disordered systems. Increasing the strength of inelastic interactions, we find that (i) sound softening vanishes and (ii) sound attenuation due to configurational disorder, i.e. the Rayleigh scattering at low frequencies and disorder-induced broadening at high frequencies, is completely dominated by the energy dissipation. Our findings suggest that sound damping in granular media is determined by the interplay between elastic heterogeneities and inelastic interactions.

9 pages, 7 figures

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Cited by in corpus (5)

• Theory of sound attenuation in amorphous solids from nonaffine motions
• Non-phononic density of states of two-dimensional glasses revealed by random pinning
• Properties of stable ensembles of Euclidean random matrices
• Phonon transport properties of particulate physical gels
• Unified study of viscoelasticity and sound damping in hard and soft amorphous solids