Geometry of Yield Surfaces for Frictional Flow of Granular Materialsby Donald D. Gray, West Virginia Univ, Morgantown, United States,
James M. Stiles, West Virginia Univ, Morgantown, United States,
Abstract: In the frictional flow regime, the discrete particles which compose of granular material roll or slide over one another, maintaining essentially continuous contact. Many theorists, including the authors, have modeled frictional flow using the theory of plasticity as extended in the context of critical state soil mechanics. The granular material is idealized as a rigid-plastic continuum whose constitutive relation consists of two parts: a yield condition which determines the conditions for which plastic flow occurs, and a flow rule which relates the strain rate tensor and the stress tensor.
Subject Headings: Granular materials | Friction | Solids flow | Plasticity | Overland flow | Particles | Sliding effects | Critical flow
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