Abstract. We study dense, frictional, polydisperse 3D granular assemblies under uniaxial deformation with Discrete Element Method (DEM) simulations. The overall goal -beyond the scope of the present study -is to link microscopic parameters and observations with the macroscopic behavior, for different elementary deformation modes.At present, we focus on the behavior of the force/contact network during uniaxial deformation, for different coefficients of friction. We discuss the stress and structural anisotropy and the relationship between force intensity weighted by contact state (sticking or sliding, at the Coulomb limit) or force strength. Furthermore, we study the orientational distribution of contacts and forces and the contribution of friction to structural anisotropy. We find that initial isotropic states are irrecoverable, since the structural anisotropy is independent of the deviatoric stress behavior both with and without friction. Contacts display an interesting anisotropy of order four in the presence of friction.
Abstract. We present experimental findings on the flowability and avalanching behavior of cohesive powders in a rotating drum. The main goal -beyond the scope of the current study -is to develop a method to understand and predict phenomena that precede the occurrences of events like avalanches and then to simulate this with the Discrete Element Method. In the present study, we focus on the characterization, classification, and description of the various events possible in cohesive powders -other than in non-cohesive particle systems -during rotation in a drum. Events are categorized based on their nature and we speculate on their relation to the micro-structure and properties of the powder.As main result, we show that repeatable and consistent results can be obtained in the characterization of cohesive powders when angle-based (e.g. local surface and global center-of-mass) parameters are used. Different events can be distinguished, especially for strong cohesion, bulk shear sliding is often replaced by other events like slumping.
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