Ultrasound Induces Aging in Granular Materials

David Espíndola, Belfor Galaz, and Francisco Melo
Phys. Rev. Lett. 109, 158301 – Published 9 October 2012

Abstract

Aging and rejuvenation have been identified as the general mechanisms that rule the time evolution of granular materials subjected to some external confinement pressure. In creep experiments performed in a triaxial configuration, we obtained evidence that relatively high intensity ultrasound waves propagating through the material induce both weakening and significant plasticity. In the framework of glassy materials, it is shown that the effect of ultrasound can be simply accounted for by a general variable, the fluidity, whose dynamics are described by an effective aging parameter that strongly decreases with sound amplitude and vanishes at the yield stress limit. The response from step perturbations in ultrasound intensity provided a method to assess the effective-viscosity jumps which are direct evidence of acoustic fluidization.

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  • Received 26 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.158301

© 2012 American Physical Society

Authors & Affiliations

David Espíndola, Belfor Galaz, and Francisco Melo

  • Departamento de Física, Universidad de Santiago de Chile, Avenida Ecuador 3493, Casilla 307, Correo 2, Santiago, Chile

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Vol. 109, Iss. 15 — 12 October 2012

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