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Transition from rolling to jamming in thin granular layers.

C Marone¹, B M Carpenter, P Schiffer

¹Department of Geosciences and Energy Institute Center for Geomechanics, Geofluids, and Geohazards, The Pennsylvania State University, University Park, Pennsylvania 16802, USA. cjm@geosc.psu.edu

Physical Review Letters

|December 31, 2008

Summary

We investigated granular jamming in sheared bead layers. Friction jumps significantly as layer thickness exceeds the bead diameter, transitioning from rolling to jamming behavior.

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Area of Science:

Physics
Materials Science
Rheology

Background:

Granular materials exhibit complex behaviors under shear.
Understanding the jamming transition is crucial for predicting material flow and stability.

Purpose of the Study:

To investigate the granular jamming transition in sheared layers of spherical beads.
To determine the effect of layer thickness on friction and pressure.

Main Methods:

Shearing experiments on spherical bead layers with thicknesses from 1 to 3 times the bead diameter (d).
Measurement of friction coefficients and effective granular pressure.

Main Results:

A discontinuous jump in friction from 0.02 to >0.1 was observed as layer thickness increased slightly above d, indicating a transition from rolling to jamming.
Above a critical thickness, effective granular pressure increased with thickness following a power law.
For thin layers, friction and pressure increased with decreasing packing fraction near the jamming transition, contrary to bulk granular matter expectations.

Conclusions:

Layer thickness is a critical parameter in the granular jamming transition.
The behavior of thin granular layers near jamming differs significantly from bulk granular matter.
These findings have implications for modeling granular flows and material design.