- 10-205 Jean-Francois Metayer, Donald J. Suntrup III, Charles Radin, Harry L. Swinney, Matthias Schroeter
- Shearing of frictional sphere packings
Dec 22, 10
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Abstract. We measure shear response in packings of glass beads by pulling a thin,
rough, metal plate vertically through a bed of volume fraction $\phi$, 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 $\phi$, with a transition at $\phi pprox 0.595$.
An analysis of the measured force fluctuations indicates that the shear modulus
is significantly smaller than the bulk modulus.