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Rheometry of dense granular materials: the crucial effects of gravity and confining walls

Kumar, Shravan V and Murthy, Tejas and Nott, Prabhu R (2013) Rheometry of dense granular materials: the crucial effects of gravity and confining walls. In: 7th International Conference on Micromechanics of Granular Media (Powders and Grains), JUL 08-12, 2013 , Sydney, AUSTRALIA, pp. 49-51.

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Official URL: http://dx.doi.org/10.1063/1.4811866


We describe here the rheological response of dense, slowly deforming granular materials to shear in a cylindrical Couette cell. All components of the stress on the outer cylinder are measured pointwise as a function of the depth, for different methods of construction of the bed that presumably lead to distinct fabrics. The static stress profiles for the different construction protocols are different, but a stress profile that is independent of construction history emerges when the granular column is sheared for sufficient time, in accord with the predictions of plasticity theories. However the qualitative features of the the stress profile under shear differs radically from the predictions of plasticity theories and data reported in earlier studies. We discuss a hypothesis for the anomalous stress profiles that was proposed recently by us, and the ways in which further experiments may to conducted to verify it.

Item Type: Conference Proceedings
Series.: AIP Conference Proceedings
Additional Information: Copyright for this article belongs to the AIP
Keywords: granular materials; rheology; fabric; anisotropy
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 10 Sep 2013 05:46
Last Modified: 10 Sep 2013 05:47
URI: http://eprints.iisc.ac.in/id/eprint/47091

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