The effects of grain shape and frustration in a granular column near
jamming |
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Authors: | J-M Luck and A Mehta |
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Institution: | 1.Institut de Physique Théorique, IPhT, CEA Saclay,
and URA 2306, CNRS,Gif-sur-Yvette Cedex,France;2.S.N. Bose National Centre for Basic Sciences, Block JD, Sector 3,
Salt Lake,Calcutta,India |
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Abstract: | We investigate the full phase diagram of a column of grains near jamming,
as a function of varying levels of frustration.
Frustration is modelled by the effect of two opposing fields on a grain,
due respectively to grains above and below it.
The resulting four dynamical regimes
(ballistic, logarithmic, activated and glassy)
are characterised
by means of the jamming time of zero-temperature dynamics,
and of the statistics of attractors reached by the latter.
Shape effects are most pronounced in the cases of strong and weak
frustration, and essentially disappear around a mean-field point. |
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Keywords: | |
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