Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Granular matter / contact dynamics

DY 18.1: Vortrag

Mittwoch, 25. März 2009, 16:15–16:30, HÜL 386

Quasistatic rheology at random close packing — •Claus Heussinger and Jean-Louis Barrat — Laboratoire de Physique de la Matière Condensée et Nanostructures Université Lyon 1, France

We report results of quasistatic shear simulations of athermal packings of frictionless elastic particles. We focus on densities at random close packing, where the system undergoes the "jamming" transition from a fluid to a solid state.

Previous studies have either concentrated on the linear elastic properties in the solid phase (development of "soft modes" under decompression, O'Hern PRE 2003), or on the flow properties of the fluid (e.g. Olson PRL 2007).

In contrast, the quasi-static method allows us to discuss both aspects at the same time as the simulation probes the borderline between fluid and solid phase -- by construction it follows the yield-stress line of the material. The emerging coexistence of flowing and jammed states allows us to gain novel insights into the nature of the jamming transition.