Influence of particle elasticity in shear testers |
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Authors: | Dirk Kadau Dominik Schwesig Jörg Theuerkauf Dietrich E. Wolf |
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Affiliation: | (1) Department of Physics, Duisburg-Essen University, D-47048 Duisburg, Germany;(2) The Dow Chemical Company, Solids Processing Laboratory, Freeport, TX 77541, USA |
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Abstract: | Two dimensional simulations of non-cohesive granular matter in a biaxial shear tester are discussed. The effect of particle elasticity on the mechanical behavior is investigated using two complementary distinct element methods (DEM): Soft particle molecular dynamics simulations (Particle Flow Code, PFC) for elastic particles and contact dynamics simulations (CD) for the limit of perfectly rigid particles. As soon as the system dilates to form shear bands, it relaxes the elastic strains so that one finds the same stresses for rigid respectively elastic particles in steady state flow. The principal stresses in steady state flow are determined. They are proportional to each other, giving rise to an effective macroscopic friction coefficient which is about 10% smaller than the microscopic friction coefficient between the grains. |
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Keywords: | Granular matter Contact Dynamics Simulations Molecular Dynamics Simulation Distinct Element Method biaxial test shearing shear tester steady state flow elasticity |
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