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The stress in a slowly sheared granular column

Mehandia, Vishwajeet and Nott, Prabhu R (2010) The stress in a slowly sheared granular column. In: IUTAM-ISIMM Symposium on Mathematical Modeling and Physical Instances of Granular Flows, SEP 14-18, 2009, Reggio Calabria,, pp. 333-339.

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We report measurements of the wall stress in a granular material sheared in a cylindrical Couette cell, as a function of the distance from the free surface. Our results shows that when the material is static, all components of the stress saturate to constant values within a short distance from the free surface, in conformity with earlier experiments and theoretical predictions. When the material is sheared by rotating the inner cylinder at a constant rate, the stresses are remarkably altered. The radial normal stress does not saturate, and increases even more rapidly with depth than the linear hydrostatic pressure profile. The axial shear stress changes sign on shearing, and its magnitude increases with depth. These results are discussed in the context of the predictions of the classical and Cosserat plasticity theories.

Item Type: Conference Paper
Series.: AIP Conference Proceedings
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Keywords: granular flow;granular theology;stress measurement
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 23 Aug 2010 05:19
Last Modified: 23 Aug 2010 05:19
URI: http://eprints.iisc.ac.in/id/eprint/31499

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