Shearing of frictional sphere packings

Author :J-F. Métayer, D. J. Suntrup III, C. Radin, H. L. Swinney and M. Schröter
Publisher :EPL Journal
Volume :93
Pages :64033
Year :2011

We measure shear response in packings of glass beads by pulling a thin, rough, metal
plate vertically through a bed of volume fraction , which is set, before the plate is pulled, in
the range 0.575 to 0.628. The yield stress is velocity independent over 4 decades and increases
exponentially with , with a transition at   0.595. An analysis of the measured force fluctuations
indicates that the shear modulus is significantly smaller than the bulk modulus.