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DY: Fachverband Dynamik und Statistische Physik

DY 4: Granular Matter / Contact Dynamics Part I

DY 4.11: Talk

Monday, March 16, 2015, 12:15–12:30, BH-N 128

Heterogeneity of local mechanical properties in binary granular systems — •Sebastian Pitikaris, Peidong Yu, and Matthias Sperl — DLR Institute of Materials Physics in Space, Cologne, Germany

We investigate the critical scaling behavior of the contact number above the critical packing fraction in binary mixtures. We use different particle concentrations and strongly varying size ratios to see whether there is an influence to the scaling exponent. The results can be compared to theoretical predictions.

From stress-birefringent images we can precisely identify rattlers and moreover reconstruct force distributions and thus compute the local shear modulus. The results can be compared to recent simulation work which predicts a heterogeneous shear modulus in disordered systems.