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

'Flow and jam' of frictional athermal systems under shear stress

Coniglio A
2011

Abstract

We report recent results of molecular dynamics simulations of frictional athermal particles at constant volume fraction and constant applied shear stress, focussing on a range of control parameters where the system first flows, but then jams after a time t jam. On decreasing the volume fraction, the mean jamming time diverges, while its sample fluctuations become so large that the jamming time probability distribution becomes a power law. We obtain an insight into the origin of this phenomenology focussing on the flowing regime, which is characterised by the presence of a clear correlation between the shear velocity and the mean number of contacts per particle Z, whereby small velocities occur when Z acquires higher values.
2011
Istituto Superconduttori, materiali innovativi e dispositivi - SPIN
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/31920
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