Unsteady Shear of Dense Assemblies of Cohesive Granular Materials under Constant Volume Conditions
LR Aarons and J Sun and S Sundaresan, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 49, 5153-5165 (2010).
The response characteristics of dense assemblies of cohesive granular materials to unsteady simple shear in the quasi-static regime are investigated through discrete element method (DEM) simulations of monodisperse spherical and frictional particles in periodic domains at constant volume. The dynamics of the volume-averaged normal and shear stresses in materials, undergoing stop-and-go shearing and oscillatory shear, are studied in detail Furthermore, the evolution of microstructure anisotropy has been quantified through a fabric tensor The stresses and the microstructure anisotropy depend on the strain extent but not on the shear rate. They both undergo a transition following reversal of shear direction, which requires a shear strain of order unity to fully adapt
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