Phys. Rev. Lett. 82, 5241–5244 (1999)Stress Fluctuations in a 2D Granular Couette Experiment: A Continuous TransitionReceived 6 October 1998; published in the issue dated 28 June 1999 Experiments on a slowly sheared 2D granular material show a continuous transition as the packing fraction γ passes through γc≃0.776. The mean stress, σ̅ , plays the role of an order parameter. As γ→γc from above, (1) the compressibility becomes large, (2) a slowing down of the mean velocity occurs, (3) the force distributions change, and (4) the network of stress chains changes from intermittent long radial chains near γc to a tangled dense network for larger γ. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.5241
DOI:
10.1103/PhysRevLett.82.5241
PACS:
46.10.+z, 45.05.+x
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