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Creep dynamics of athermal amorphous materials: a mesoscopic approach

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Abstract

Yield stress fluids display complex dynamics, in particular when driven into the transient regime between the solid and the flowing state. Inspired by creep experiments on dense amorphous materials, we implement mesoscale elasto-plastic descriptions to analyze such transient dynamics in athermal systems. Both our mean-field and space-dependent approaches consistently reproduce the typical experimental strain rate responses to different applied steps in stress. Moreover, they allow us to understand basic processes involved in the strain rate slowing down (creep) and the strain rate acceleration (fluidization) phases. The fluidization time increases in a power-law fashion as the applied external stress approaches a static yield stress. This stress value is related to the stress over-shoot in shear start-up experiments, and it is known to depend on sample preparation and age. By calculating correlations of the accumulated plasticity in the spatially resolved model, we reveal different modes of cooperative motion during the creep dynamics.

Graphical abstract: Creep dynamics of athermal amorphous materials: a mesoscopic approach

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Publication details

The article was received on 06 Jul 2018, accepted on 20 Sep 2018 and first published on 21 Sep 2018


Article type: Paper
DOI: 10.1039/C8SM01392F
Citation: Soft Matter, 2018, Advance Article
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    Creep dynamics of athermal amorphous materials: a mesoscopic approach

    C. Liu, E. E. Ferrero, K. Martens and J. Barrat, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM01392F

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