Stick-slip instabilities in sheared granular flow: the role of friction and acoustic vibrations
arXiv:1506.00331 · doi:10.1103/PhysRevE.92.022209
Abstract
We propose a theory of shear flow in dense granular materials. A key ingredient of the theory is an effective temperature that determines how the material responds to external driving forces such as shear stresses and vibrations. We show that, within our model, friction between grains produces stick-slip behavior at intermediate shear rates, even if the material is rate-strengthening at larger rates. In addition, externally generated acoustic vibrations alter the stick-slip amplitude, or suppress stick-slip altogether, depending on the pressure and shear rate. We construct a phase diagram that indicates the parameter regimes for which stick-slip occurs in the presence and absence of acoustic vibrations of a fixed amplitude and frequency. These results connect the microscopic physics to macroscopic dynamics, and thus produce useful information about a variety of granular phenomena including rupture and slip along earthquake faults, the remote triggering of instabilities, and the control of friction in material processing.
12 pages, 8 figures
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Cited by in corpus (7)
- Acoustically-induced slip in sheared granular layers: application to dynamic earthquake triggering
- Induced and endogenous acoustic oscillations in granular faults
- Earthquake statistics inferred from plastic events in soft-glassy materials
- Localization and instability in sheared granular materials: Role of friction and vibration
- Criticality at finite strain rate in fluidized soft glassy materials
- Synchronized oscillations and acoustic fluidization in confined granular materials
- A Model for Athermal Strain Localization in Dry Sheared Fault Gouge