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DF: Fachverband Dielektrische Festkörper

DF 6: Glass II (joint session with DY)

DF 6.10: Vortrag

Dienstag, 27. März 2007, 17:30–17:50, H23

The Jamming Transition in Granular Systems — •Matthias Sperl¹, Trushant Majmudar¹, Stefan Luding², and Robert Behringer¹ — ¹Duke University — ²TU Delft

Recent simulations have predicted that near jamming for collections of spherical particles, there will be a discontinuous increase in the mean contact number, Z, at a critical volume fraction, φ_c. Above φ_c, Z and the pressure, P, are predicted to increase as power laws in φ−φ_c. In experiments using photoelastic disks we corroborate a rapid increase in Z at φ_c and power-law behavior above φ_c for Z and P. Specifically we find power-law increase as a function of φ−φ_c for Z−Z_c with an exponent beta around 0.5, and for P with an exponent ψ around 1.1.