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The pressure and viscosity in two-dimensional sheared granular assemblies are investigated numerically for varying disks’ toughness, degree of polydispersity and coefficient of normal restitution. In the rigid, elastic limit of monodisperse systems, the viscosity is approximately inverse proportional to the area fraction difference from φη ' 0.7, but the pressure is still finite at φη. On the other hand, in moderately soft, dissipative and polydisperse systems, we confirm the recent theoretical prediction that both scaled pressure (divided by the kinetic

Frontiers in Nonequilibrium Physics, Fundamental Theory, Glassy & Granular Materials, and Computational Physics, July 21 - August 21, 2009