Structural Characterization and Statistical Properties of Two-Dimensional Granular Systems During the Compaction

• Authors: S. Živković , Z. Jakšić , D. Arsenović , Lj. Budinski-Petković , S. Vrhovac
• Languages of publication: EN

Abstracts

EN

We study the compaction dynamics of frictional hard disks in two dimensions, subjected to vertical shaking, by numerical simulation. Shaking is modeled by a series of vertical expansions of the disk packing, followed by dynamical recompression of the assembly under the action of gravity. The second phase of the shake cycle is based on an efficient event-driven molecular-dynamics algorithm. We analyze the compaction dynamics for various values of the friction coefficient and the coefficient of normal restitution. The granular organization at local level was studied by analyzing the shape factor ξ of the local volumes, associated with a natural way of subdividing the volume into local parts - the Voronoi partition. It gives a clear physical picture of the competition between less and more ordered domains of particles during the compaction. We calculate the distribution of the shape-factor for packings at different stages of the compaction process. We have also investigated a two-dimensional granular medium experimentally. We prepared the granular packings of metallic cylinders of diameters 4, 5, and 6 mm. The distributions of the shape-factor obtained numerically for various tapping intensities are consistent with our experimental results.

Keywords

EN

45.70.-n; 45.70.Cc; 81.05.Rm; 61.43.Bn

Discipline

• 45.70.Cc: Static sandpiles; granular compaction
• 61.43.Bn: Structural modeling: serial-addition models, computer simulation
• 81.05.Rm: Porous materials; granular materials(for granular superconductors, see 74.81.Bd)
• 45.70.-n: Granular systems(see also 05.65.+b Self-organized systems)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 2
• Pages: 246-251

Dates

published

2011-08

Contributors

author

S. Živković

• Institute of Physics, University of Belgrade, P.O. Box 68, Zemun 11080, Belgrade, Serbia

author

Z. Jakšić

• Institute of Physics, University of Belgrade, P.O. Box 68, Zemun 11080, Belgrade, Serbia

author

D. Arsenović

• Institute of Physics, University of Belgrade, P.O. Box 68, Zemun 11080, Belgrade, Serbia

author

Lj. Budinski-Petković

• Faculty of Engineering, Trg. D. Obradovića 6, Novi Sad 21000, Serbia

author

S. Vrhovac

• Institute of Physics, University of Belgrade, P.O. Box 68, Zemun 11080, Belgrade, Serbia

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Identifiers

DOI

10.12693/APhysPolA.120.246