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A kinetic elasto-plastic model exhibiting viscosity bifurcation in soft glassy materials

par Colin Annie, Mansard Vincent - publié le , mis à jour le

A kinetic elasto-plastic model of the dynamics of a flowing jammed
material is proposed, supplemented with a phenomenological equa-
tion describing the coupling of the flow and the structure of the fluid.
Coarse graining these equations yields a non-local constitutive law
for the flow, with the introduction of the number of plastic events per
unit time, called the fluidity, as a key dynamical parameter. Above
a given threshold, the weakening of the structure caused by the flow
induces a macroscopic phase separation that causes viscosity
bifurcation.

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