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DY: Fachverband Dynamik und Statistische Physik

DY 24: Granular matter II

DY 24.7: Talk

Thursday, February 28, 2008, 11:30–11:45, MA 004

The phase diagram of static granular media — •Matthias Schröter¹, Trey Suntrup¹, Charles Radin², and Harry L. Swinney¹ — ¹CNLD, UT Austin, Texas — ²Math, UT Austin, Texas

The idea of an ensemble approach to static granular media was first discussed by Edwards & Oakeshott in 1989 (Physica A 157, 1080). However, the difficulty to control the underlying state variables of pressure p and volume fraction φ hampered experimental tests of this idea until recently. We show that the preparation of granular samples with flow pulses in a fluidized bed allows an independent control of φ and p. The so determined phase diagram is the test case for the still developing statistical mechanics of static granular media.