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Dresden 2014 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Focus Session: Slow Dynamics in Glasses and Granular Matter I (joint session DY/ CPP/ DF)

DY 26.4: Talk

Thursday, April 3, 2014, 10:45–11:00, HÜL 186

Jamming of Frictional Particles: a First Order Phase Transition — •Matthias Grob1, Claus Heussinger2, and Annette Zippelius1,21Max-Planck-Institut für Dynamik und Selbstorganisation, Göttingen, Deutschland — 2Institut für Theoretische Physik, Universität Göttingen, Göttingen, Deutschland

With numerical simulations, we produce flow curves for dense frictional granular media with features different from the frictionless analog. When the strain rate is controlled and increased, a smooth transition from inertial to plastic flow is observed below a critical volume fraction. Above this packing fraction, the transition becomes discontinuous as a hallmark of friction. Upon an increase of packing fraction, the flow curves show hysteretic behaviour, the emergence of a yield stress and the divergence of the shear viscosity - each at a different packing fraction. All the reported behaviour is reproduced with a simple model for a non-equilibrium first order phase transition. An inherent feature of dense frictional granular rheology is that the transition from flowing to jammed states is reentrant with transient jam-and-flow states in between which are, within the models' framework, metastable flow states.

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