Abstract
Granular matter, consisting of hard, frictional, cohesionless spheres, sheared in a simple shear geometry with smooth walls undergoes a velocity driven transition from a jammed or creeping state (low wall velocity) to a flow state with a finite shear rate in the bulk (high wall velocity). In the flow state, the state variables volume fraction \(\nu \), inertial number I and the macroscopic friction \(\mu \) of the bulk follow an exponential transient. The characteristic time of this progression grows with the wall velocity and the system size and is typically large compared to the inverse shear rate. It is shown that I, first being stationary in the shear zones, spreads diffusively into the bulk. The other state variables follow according to the constitutive laws, well known from the steady state.
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Acknowledgments
We like to thank Ken Kamrin for clarifying a question about his model to us. This research was supported by DFG by the grant WO 577 / 8 within the Priority Program SPP 1486 “Particles in Contact” (PiKo).
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Ries, A., Brendel, L. & Wolf, D.E. Shearrate diffusion and constitutive relations during transients in simple shear. Comp. Part. Mech. 3, 303–310 (2016). https://doi.org/10.1007/s40571-015-0058-3
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DOI: https://doi.org/10.1007/s40571-015-0058-3