We relate the creep exponent observed before fluidization to the width of barrier distribution and to the specific form of stress redistribution following yielding events. Here, we characterize creep and fluidization on the basis of a mesoscopic viscoplastic model that includes thermally activated yielding events and a broad distribution of energy barriers, which may be lowered under the effect of a local deformation. A fundamental understanding of these processes is still far from being achieved. When submitted to a constant mechanical load, many materials display power law creep followed by fluidization. Thermally activated creep and fluidization in flowing disordered materials
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