Microscopic Origin of Nonlocal Rheology in Dense Granular Materials
Johan Gaume, Guillaume Chambon, Mohamed Naaïm
Abstract
We study the microscopic origin of nonlocality in dense granular media. Discrete element simulations reveal that macroscopic shear results from a balance between microscopic elementary rearrangements occurring in opposite directions. The effective macroscopic fluidity of the material is controlled by these velocity fluctuations, which are responsible for nonlocal effects in quasistatic regions. We define a new micromechanically based unified constitutive law describing both quasistatic and inertial regimes, valid for different system configurations.
Topics & Concepts
Quasistatic processQuantum nonlocalityRheologyInertial frame of referenceShear (geology)Granular materialClassical mechanicsPhysicsMechanicsConstitutive equationMaterials scienceFinite element methodThermodynamicsQuantum mechanicsQuantumQuantum entanglementComposite materialGranular flow and fluidized bedsGeotechnical and Geomechanical EngineeringHydraulic Fracturing and Reservoir Analysis