Volume 78, Number 4, May 2007
|Number of page(s)||4|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||10 May 2007|
Phase transition in a static granular system
Physics Department and Center for Nonlinear Dynamics, University of Texas at Austin - Austin, TX 78712, USA
2 Mathematics Department, University of Texas at Austin - Austin, TX 78712, USA
Corresponding authors: email@example.com firstname.lastname@example.org
Accepted: 11 April 2007
We find that a column of glass beads exhibits a well-defined transition between two phases that differ in their resistance to shear. Pulses of fluidization are used to prepare static sedimented states with well-defined particle volume fractions in the range 0.570.63. The resistance to shear is determined by slowly inserting a rod into the column of beads. Force measurements and bed height measurements both indicate that the transition occurs at for a range of speeds of the rod.
PACS: 45.70.Cc – Static sandpiles; granular compaction / 81.05.Rm – Porous materials; granular materials / 45.70.-n – Granular systems
© Europhysics Letters Association, 2007
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