'Flow & Jam' of frictional athermal systems under shear stress

Details 'Flow & Jam' of frictional athermal systems under shear stress 'Flow & Jam' of frictional athermal systems under shear stress

2012-02-21

arxiv.org/abs/1202.4645v1

Philosophical Magazine, 91, 13, 2006 - 2013, (2011)

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 7 figures

Scientific paper

10.1080/14786435.2010.540457

We report recent results of molecular dynamics simulations of frictional athermal particles at constant volume fraction and constant applied shear stress, focusing on a range of control parameters where the system first flows, but then jams after a time tjam. On decreasing the volume fraction, the mean jamming time diverges, while its sample fluctuations become so large that the jamming time probability distribution P(tjam) becomes a power-law. We obtain an insight on the origin of this phenomenology focusing on the flowing regime, which is characterized by the presence of a clear correlation between the shear velocity and the mean number of contacts per particles Z, whereby small velocities occur when Z acquires higher values.

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