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Granular materials consist of macroscopic, athermal packings of particles which only interact via dissipative contact forces. The systems can adopt different states of aggregation depending on the external driving conditions. The viscosity dependence of a granular fluid will be probed by an active microrheology setup. We demonstrate access to three viscosity regimes depending on the shear rate. In a static granular system we measure the contact forces on grain scale and evaluate the local mechanical heterogeneities in an amorphous and crystalline packing.

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Sebastian Pitikaris, DLR
Conference room TP 0.02
Contact: Andreas Schadschneider