Granular flow: Friction and the dilatancy transition
- 23 September 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 67 (13) , 1751-1754
- https://doi.org/10.1103/physrevlett.67.1751
Abstract
Molecular-dynamics simulations of noncohesive granular assemblies under shear are described. At low shear rate γ̇, the assembly is unstable to uniform motion and exhibits stick-slip dynamics involving periodic dilatancy transitions and gravitational compactification. Steady-state motion occurs at larger γ̇ where 6–12 layers of grains flow over a compact, static assembly. A phase boundary, characterized by a discontinuity in γ̇ and an enhanced normal stress, separates the static and flowing regions. In the steady-state regime, dilatancy leads to a shear stress that is independent of γ̇.Keywords
This publication has 13 references indexed in Scilit:
- Structural features in granular flowsJournal of Geophysical Research, 1990
- Friction in Granular FlowsEurophysics Letters, 1990
- Rapid Granular FlowsAnnual Review of Fluid Mechanics, 1990
- Frictional–collisional constitutive relations for granular materials, with application to plane shearingJournal of Fluid Mechanics, 1987
- Computer simulation of the mechanical sorting of grainsPowder Technology, 1986
- Viscosity, granular‐temperature, and stress calculations for shearing assemblies of inelastic, frictional disksJournal of Rheology, 1986
- Computer simulation of granular shear flowsJournal of Fluid Mechanics, 1985
- Observations of rapidly flowing granular-fluid materialsJournal of Fluid Mechanics, 1985
- The shearing and dilatation of dry sand and the 'singing’ mechanismProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1966
- Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shearProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1954