Constitutive Relations of Dense Granulates with Friction and Adhesion from Dem
نویسندگان
چکیده
Granular materials in a split-bottom ring shear cell geometry show wide shear bands under slow, quasi-static deformation. From discrete element simulations (DEM), continuum fields like the deformation gradient and stress can be computed with the goal to formulate objective constitutive relations for the flow behavior. From a single simulation only, by applying timeand (local) space-averaging, yield loci can be obtained: linear for noncohesive granular materials and non-linear with peculiar pressure dependence for adhesive powders.
منابع مشابه
Constitutive relations for the shear-band evolution in granular matter under large strain
A so-called “split-bottom ring shear cell” leads to wide shear bands under slow, quasi-static deformation. From discrete element simulations (DEM), several continuum fields like the density, velocity, deformation gradient and stress are computed and evaluated with the goal to formulate objective constitutive relations for the powder flow behavior. From a single simulation, by applying timeand (...
متن کاملAbstract Submitted for the MAR10 Meeting of The American Physical Society Constitutive relations in dense granular flows
Submitted for the MAR10 Meeting of The American Physical Society Constitutive relations in dense granular flows JOHN DROZD, The University of Western Onatrio, COLIN DENNISTON, The University of Western Ontario — We use simulations in a vertical chute configuration to investigate constitutive relations in dry granular flow. We study relations describing the local stresses, heat flow, and dissipa...
متن کاملContinuum approach to wide shear zones in quasistatic granular matter.
Slow and dense granular flows often exhibit narrow shear bands, making them ill suited for a continuum description. However, smooth granular flows have been shown to occur in specific geometries such as linear shear in the absence of gravity, slow inclined plane flows and, recently, flows in split-bottom Couette geometries. The wide shear regions in these systems should be amenable to a continu...
متن کاملComputation of Slip analysis to detect adhesion for protection of rail vehicle and derailment
Adhesion level for the proper running of rail wheelset on track has remained a significant problem for researchers in detecting slippage to avoid accidents. In this paper, the slippage of rail wheels has been observed applying forward and lateral motions to slip velocity and torsion motion. The longitudinal and lateral forces behavior is watched with respect to traction force to note correlatio...
متن کاملUniversality of shear-banding instability and crystallization in sheared granular fluid
The linear stability analysis of an uniform shear flow of granular materials is revisited using several cases of a Navier-Stokes’-level constitutive model in which we incorporate the global equation of states for pressure and thermal conductivity (which are accurate up-to the maximum packing density νm) and the shear viscosity is allowed to diverge at a density νμ (< νm), with all other transpo...
متن کامل