4 papers · 1 filter
Why Do Granular Materials Stiffen with Shear Rate? A Test of Novel Stress-Based Statistics
Robert P. Behringer, Dapeng Bi, Bulbul Chakraborty +2
Recent experiments exhibit a rate-dependence for granular shear such that the stress grows linearly in the logarithm of the shear rate, \dotγ. Assuming a generalized activated proc…
Force networks and elasticity in granular silos
John F. Wambaugh, Robert R. Hartley, Robert P. Behringer
We have made experimental observations of the force networks within a two-dimensional granular silo similar to the classical system of Janssen. Models like that of Janssen predict…
Segregation by friction
L. Kondic, R. R. Hartley, S. G. K. Tennakoon +2
Granular materials are known to separate by size under a variety of circumstances. Experiments presented here and elucidated by modeling and MD simulation document a new segregatio…
Logarithmic rate dependence in deforming granular materials
R. R. Hartley, R. P. Behringer
Rate-independence for stresses within a granular material is a basic tenet of many models for slow dense granular flows. By contrast, logarithmic rate dependence of stresses is fou…