| The Development Of Circulation Cell Structures In Granular Materials Undergoing Compression (2007) | |||||||||||||||
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| This paper predicts the formation of microstructures within a granular material undergoing biaxial compression. Using the discrete element method we test ensembles of particles of varying geometric shape and size. The tests predict that the motion of the particles deviates significantly from that predicted by continuum theory. The particles form localized coherent structures (here called circulation cells) in which groups of particles instantaneously behave as a rigid body. These circulation cells migrate and coalesce to form larger structures. Eventually a global shear band forms at the boundary of two or more of the circulation cells. 1.0 Introduction The macroscopic deformational behavior of a granular material is primarily due to the rearrangement of the individual particles. The particle interactions are governed by the mechanical and geometric properties of the particles, such as shape, size, roughness and contact stiffness. The ultimate goal of studying the micromechanics of gr... | |||||||||||||||
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