Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Granular Matter / Contact Dynamics

DY 21.4: Vortrag

Mittwoch, 13. März 2013, 15:45–16:00, H47

Self-organized changes in the transient behavior of sheared granular materials — •János Török¹, Tamás Börzsönyi², and Balázs Szabó² — ¹institute of Physics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary — ²Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary

Recently the kinetic elastoplastic model was introduced to describe the shearing of granular material. It is based on the separation of elastic and plastic deformation where the plastic events modify the local shear stress. Here we propose a mesoscopic model which captures the essence of the kinetic elastoplastic model while making it usable for more complicated geometries like modified Couette cell. We show that in the transient phase the flow gets narrower and this is due to the change in the distribution of the material density around the shear zone. The results are tested against CT and surface video measurements which show perfect agreement in both width and density evolution.