10-205 Jean-Francois Metayer, Donald J. Suntrup III, Charles Radin, Harry L. Swinney, Matthias Schroeter
Shearing of frictional sphere packings (999K, pdf) 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.

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