2009/04/30 by P. -P. Cortet, Pierre-Philippe Cortet, Daniel Bonamy +7
Engineering · Environmental Science · Physics and Astronomy · #Classical mechanics #Composite material #Creep #Dilatant #Flow (mathematics) #Granular flow and fluidized beds #Granular material #Jamming #Landslides and related hazards #Materials science #Mechanics #Physics #Plasticity #Rheology #Soil and Unsaturated Flow #Statistical physics #Strain rate #Thermodynamics #Viscoelasticity #cond-mat.other #cond-mat.soft
paper · pdf · doi:10.1209/0295-5075/88/14001
published as P.-P. Cortet, D. Bonamy, F. Daviaud, O. Dauchot, B. Dubrulle, M. Renouf, EPL 88 14001 (2009)
openalex publication_date 2009/10/01 · arxiv created 2009/11/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We confront a recent visco-plastic description of dense granular flows ( Jop P. et al. , Nature , 441 (2006) 727 ) with multi-directional inhomogeneous steady flows observed in non-smooth contact dynamics simulations of 2D half-filled rotating drums. Special attention is paid to check separately the two underlying fundamental statements into which the considered theory can be recast, namely i) a single relation between the invariants of stress and strain rate tensors and ii) the alignment between these tensors. Interestingly, the first prediction is fairly well verified over more than four decades of small strain rate, from the surface rapid flow to the quasi-static creep phase, where it is usually believed to fail because of jamming. On the other hand, the alignment between stress and strain rate tensors is shown to fail over the whole flow, what yields an apparent violation of the visco-plastic rheology when applied without care. In the quasi-static phase, the particularly large misalignment is conjectured to be related to transient dilatancy effects.