Compaction of anisotropic granular materials : experiments and simulations

Details Compaction of anisotropic granular materials : experiments and simulations Compaction of anisotropic granular materials : experiments and simulations

2004-05-12

arxiv.org/abs/cond-mat/0405245v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 10 figures

Scientific paper

10.1103/PhysRevE.70.051314

We present both experimental and numerical investigations of compaction in granular materials composed of rods. As a function of the aspect ratio of the particles, we have observed large variations of the asymptotic packing volume fraction in vertical tubes. The relevant parameter is the ratio between the rod length $\ell$ and the tube diameter $D$. Even the compaction dynamics remains unchanged for various particle lengths, a 3d/2d phase transition for grain orientations is observed for $\ell/D = 1$. A toy model for the compaction of needles on a lattice is also proposed. This toy model gives a complementary view of our experimental results and leads to behaviors similar to experimental ones.

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