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Viscoélasticité des milieux granulaires denses

Abstract : By means of a stress imposed rheometer coupled with a "vibrating cell", generating a Brownian motion at a macroscopic scale into the samples, we have shown that dense-phase vibrated powders exhibit rheological behaviours archetypal of non-Newtonian visco-elastic fluids and show very close analogies with molecular media near their glass transition. These behaviours have been described through a "free volume" structural model based on a phenomenological two-state approach related to the inherent bimodal behaviour of chain forces in granular packing, the transition between these two states being induced by shear and vibrations. The dynamics of the contact network is described via a kinetic equation accounting for the dynamics of the contact network. To allow experimental assessment, the kinetic equation is turn into a differential constitutive equation, relating stress to strain, from which rheological properties can be derived. Its integration allows predicting and describing several rheological behaviours, in stationary and non-stationary conditions: elastic linear (Hookean) and nonlinear, viscous linear (Newtonian), viscoelastic linear (Maxwellian) and frictional (Coulombian). In addition, a "time-granular temperature superposition principle", inherent to free volume theories and theoretically predicted by the model, has been experimentally verified, the granular temperature being controlled by the energy of vibration.
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https://hal.univ-lorraine.fr/tel-01540780
Contributor : Philippe Marchal <>
Submitted on : Friday, June 16, 2017 - 3:26:26 PM
Last modification on : Monday, September 23, 2019 - 5:12:19 PM
Long-term archiving on: : Wednesday, December 13, 2017 - 6:05:12 PM

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  • HAL Id : tel-01540780, version 1

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Philippe Marchal. Viscoélasticité des milieux granulaires denses. Milieux fluides et réactifs. Université de Lorraine (Nancy), 2013. ⟨tel-01540780⟩

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