Jamming of frictional tetrahedra

Details Jamming of frictional tetrahedra Jamming of frictional tetrahedra

2012-02-28

arxiv.org/abs/1202.6272v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures

Scientific paper

We prepare packings of frictional tetrahedra with volume fractions phi ranging from 0.470 to 0.612 using three different experimental protocols under isobaric conditions. Analysis via X-ray microtomography reveals that the contact number Z grows with phi, but does depend on the preparation protocol. While Z saturates at high packing fraction, the number of constraint per particle C increases further, supported by an increasing number of edge-to-face and face-to-face contacts. Even the loosest packings are strongly hyperstatic i.e. mechanically over-determined with C approximately twice the degrees of freedom each particle possesses.

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