Jamming transition in a two-dimensional open granular pile with rolling resistance
arXiv:1506.02478 · doi:10.4279/PIP.060007
Abstract
We present a molecular dynamics study of the jamming/unjamming transition in two-dimensional granular piles with open boundaries. The grains are modeled by viscoelastic forces, Coulomb friction and resistance to rolling. Two models for the rolling resistance interaction were assessed: one considers a constant rolling friction coefficient, and the other one a strain dependent coefficient. The piles are grown on a finite size substrate and subsequently discharged through an orifice opened at the center of the substrate. Varying the orifice width and taking the final height of the pile after the discharge as the order parameter, one can devise a transition from a jammed regime (when the grain flux is always clogged by an arch) to a catastrophic regime, in which the pile is completely destroyed by an avalanche as large as the system size. A finite size analysis shows that there is a finite orifice width associated with the threshold for the unjamming transition, no matter the model used for the microscopic interactions. As expected, the value of this threshold width increases when rolling resistance is considered, and it depends on the model used for the rolling friction.
9 pages, 6 figures
References in corpus (14)
- On dense granular flows
- Jamming at Zero Temperature and Zero Applied Stress: the Epitome of Disorder
- Random Packings of Frictionless Particles
- The Jamming Transition in Granular Systems
- Jamming during the discharge of granular matter from a silo
- Identification of rolling resistance as a shape parameter in sheared granular media
- Jaming and Geometry of Two-Dimensional Foams
- The shape of jamming arches in two-dimensional deposits of granular materials
- Scale separation in granular packings: stress plateaus and fluctuations
- Jamming in sheared foams and emulsions, explained by critical instability of the films between neighboring bubbles and drops
- Sensitivity of the stress response function to packing preparation
- Internal Avalanches in a Granular Medium
- Mechanical properties of inclined frictional granular layers
- Mechanical response of an inclined frictional granular layer approaching unjamming