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The static as well as the dynamic behaviour of granular material aredetermined by dynamic {\it and} static friction. There are well known methodsto include static friction in molecular dynamics simulations using scarcelyunderstood forces. We propose an Ansatz based on the geometrical shape ofnonspherical particles which does not involve an explicit expression for staticfriction. It is shown that the simulations based on this model are close toexperimental results.Comment: 11 pages, Revtex, HLRZ-33/9

Static friction phenomena in granular materials: Coulomb law versus particle geometry