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Creep dynamics of athermal amorphous materials: a mesoscopic approach
Chen Liu1, Ezequiel E Ferrero2, Kirsten Martens3
1Université Grenoble Alpes, CNRS, LIPHY, F-38000 Grenoble, France and Labortoire Fluides, Automatique et Systèmes Thermiques, Université Paris-Sud, France. chen.liu@u-psud.fr.
Soft Matter
|October 6, 2018
Summary
We model yield stress fluid dynamics, explaining creep and fluidization phases. Our findings reveal cooperative motion modes during transient dynamics in amorphous materials.
Area of Science:
- Soft Matter Physics
- Rheology
- Materials Science
Background:
- Yield stress fluids exhibit complex transient dynamics between solid and flowing states.
- Understanding these dynamics is crucial for characterizing amorphous materials.
Purpose of the Study:
- To analyze transient dynamics in athermal yield stress fluids using mesoscale elasto-plastic descriptions.
- To elucidate the fundamental processes governing creep and fluidization phases.
Main Methods:
- Implementation of mesoscale elasto-plastic descriptions.
- Utilizing both mean-field and space-dependent theoretical approaches.
- Analysis of experimental strain rate responses to applied stress steps.
Main Results:
- Consistent reproduction of experimental strain rate responses.
- Identification of power-law dependence of fluidization time on applied stress near static yield stress.
- Revealed distinct modes of cooperative motion during creep via plasticity correlations.
Conclusions:
- Mesoscale elasto-plastic models effectively capture transient dynamics in yield stress fluids.
- The study provides insights into the relationship between static yield stress and fluidization behavior.
- Cooperative motion plays a significant role in the creep dynamics of these materials.
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