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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 26.3: Talk

Thursday, April 3, 2014, 10:30–10:45, HÜL 186

Stress-birefringence information in three-dimensional binary granular packings — •Peidong Yu, Stefan Frank-Richter, and Matthias Sperl — Institut für Material Physik im Weltraum, Köln, Deutschland

We report our newly developed 3D stress-birefringence technique and its application in a binary static packing. We show how we precisely determine the stress state of one single spherical particle from its stress-birefringent response to external contacts. Such particles of two different sizes are used in a dense packing with different packing fractions. Based on the knowledge of one-particle calibration, we are able to define a transition point from the integrated stress-birefringent signal of the whole packing under changing packing fraction. Variations of these transition points with different size ratio and specie number ratio of the two particle species are measured and discussed.