Onset of mechanical stability in random packings of frictional spheres

Details Onset of mechanical stability in random packings of frictional spheres Onset of mechanical stability in random packings of frictional spheres

2007-10-26

arxiv.org/abs/0710.5160v2

Phys. Rev. Lett. 101, 018301 (2008)

Physics

Condensed Matter

Soft Condensed Matter

significantly revised, published version

Scientific paper

10.1103/PhysRevLett.101.018301

Using sedimentation to obtain precisely controlled packings of noncohesive spheres, we find that the volume fraction $\phi_{\rm RLP}$ of the loosest mechanically stable packing is in an operational sense well defined by a limit process. This random loose packing volume fraction decreases with decreasing pressure $p$ and increasing interparticle friction coefficient $\mu$. Using X-ray tomography to correct for a container boundary effect that depends on particle size, we find for rough particles in the limit $p \to 0$ a new lower bound, $\phi_{\rm RLP} = 0.550 \pm 0.001$.

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