A dense 2D granular material subject to cyclic pure shear
This work focuses on the evolution of fabric and stress tensors for an assembly of dense 2D photoelastic particles subjected to cyclic pure shear. The fabric and stress tensors are computed from the contact network and contact forces using particle tracking and photoelastic techniques. The system pressure, P, shear stress, t, and the mean contact number, Z fluctuate during the shear process. Their fluctuations are strongly correlated. We find, to a reasonable approximation, a functional relation between P, t and Z. By tracking the average contact number Z, we also find that there are jammed states at a packing fraction f = 0.758 below fc = 0.84 for the isotropic jamming transition in two dimensions. © 2009 American Institute of Physics.
Zhang, J; Ren, J; Farhadi, S; Behringer, RP; Majmudar, TS; Tordesillas, A
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