Structural transitions in granular packs: statistical mechanics and statistical geometry investigations

Aste, Tomaso and Matteo, T. (2008) Structural transitions in granular packs: statistical mechanics and statistical geometry investigations. European Physical Journal B: Condensed Matter and Complex Systems, 64 (3-4). pp. 511-517. ISSN 1434-6028. (Full text available)

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http://dx.doi.org/10.1140/epjb/e2008-00224-8

Abstract

We investigate equal spheres packings generated from several experiments and from a large number of different numerical simulations. The structural organization of these disordered packings is studied in terms of the network of common neighbours. This geometrical analysis reveals sharp changes in the network’s clustering occurring at the packing fractions (fraction of volume occupied by the spheres respect to the total volume, ρ) corresponding to the so called Random Loose Packing limit (RLP, ρ ∼ 0.555) and Random Close Packing limit (RCP, ρ ∼ 0.645). At these packing fractions we also observe abrupt changes in the fluctuations of the portion of free volume around each sphere. We analyze such fluctuations by means of a statistical mechanics approach and we show that these anomalies are associated to sharp variations in a generalized thermodynamical variable which is the analogous for these a-thermal systems to the specific heat in thermal systems.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Tomaso Aste
Date Deposited: 20 Mar 2012 16:10
Last Modified: 11 Jun 2014 13:07
Resource URI: http://kar.kent.ac.uk/id/eprint/29180 (The current URI for this page, for reference purposes)
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