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Towards a relevant set of state variables to describe static granular packings

Luis A. Pugnaloni1,*, Iván Sánchez2,3, Paula A. Gago1, José Damas2, Iker Zuriguel2, and Diego Maza2,†

  • 1Instituto de Física de Líquidos y Sistemas Biológicos (CONICET La Plata, UNLP), cc. 565, 1900 La Plata, Argentina
  • 2Departamento de Física y Matemática Aplicada, Facultad de Ciencias, Universidad de Navarra, Irunlarrea S/N, 31080 Pamplona, Spain
  • 3Centro de Física, Instituto Venezolano de Investigaciones Científicas, Apartado Postal 21827, 1020-A Caracas, Venezuela

  • *luis@iflysib.unlp.edu.ar
  • †dmaza@unav.es
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Phys. Rev. E 82, 050301(R) – Published 4 November, 2010

DOI: https://doi.org/10.1103/PhysRevE.82.050301

Abstract

We analyze, experimentally and numerically, the steady states, obtained by tapping, of a two-dimensional granular layer. Contrary to the usual assumption, we show that the reversible (steady state branch) of the density-acceleration curve is nonmonotonous. Accordingly, steady states with the same mean volume can be reached by tapping the system with very different intensities. Simulations of dissipative frictional disks show that equal volume steady states have different values of the force moment tensor. Additionally, we find that steady states of equal stress can be obtained by changing the duration of the taps; however, these states present distinct mean volumes. These results confirm previous speculations that the volume and the force moment tensor are both needed to describe univocally equilibrium states in static granular assemblies.

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References (25)

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Outline

Information

Phys. Rev. E 82, 050301(R)– Published 4 November, 2010
  • Received 18 May 2010

© 2010 American Physical Society

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