The effects of grain shape and frustration in a granular column near jamming
arXiv:1006.3397 · doi:10.1140/epjb/e2010-10469-1
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.
arXiv comment17 pages, 19 figures
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