Shearing of frictional sphere packings
Max Planck Institute for Dynamics and Self-Organization - Göttingen, Germany, EU
2 Center for Nonlinear Dynamics and Department of Physics, University of Texas at Austin - Austin, TX, USA
3 Department of Mathematics, University of Texas at Austin - Austin, TX, USA
Accepted: 23 February 2011
We measure shear response in packings of glass beads by pulling a thin, rough, metal plate vertically through a bed of volume fraction φ, which is set, before the plate is pulled, in the range from 0.575 to 0.628. The yield stress is velocity independent over 4 decades and increases exponentially with φ, with a transition at φ ≈ 0.595. An analysis of the measured force fluctuations indicates that the shear modulus is significantly smaller than the bulk modulus.
PACS: 45.70.-n – Granular systems / 45.70.Cc – Static sandpiles; granular compaction / 81.05.Rm – Porous materials; granular materials
© EPLA, 2011