Experimental and computational studies of jamming

Chaoming Song, Ping Wang, Fabricio Potiguar, Hernán A. Makse

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Jamming is a common feature of out-of-equilibrium systems showing slow relaxation dynamics. Here we review our efforts in understanding jamming in granular materials using experiments and computer simulations. We first obtain an estimation of an effective temperature for a slowly sheared granular material very close to jamming. The measurement of the effective temperature is realized in the laboratory by slowly shearing a closely packed ensemble of spherical beads confined by an external pressure in a Couette geometry. All the probe particles, independent of their characteristic features, equilibrate at the same temperature, given by the packing density of the system. This suggests that the effective temperature is a state variable for the nearly jammed system. Then we investigate numerically whether the effective temperature can be obtained from a flat average over the jammed configuration at a given energy in the granular packing, as postulated by the thermodynamic approach to grains.

Original languageEnglish (US)
Pages (from-to)S2755-S2770
JournalJournal of Physics Condensed Matter
Volume17
Issue number24
DOIs
StatePublished - Jun 22 2005
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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