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Fluidization of yield stress materials through active and activated local events
In this talk I will discuss the possible fluidization mecanisms of yield stress materials through either locally active dynamics, like cell division in tissues [1,2] or vibration induced local plasticity like in externally driven granular materials [3]. The long range elastic response to these events lead to a non-trivial fluidization of the material, that can be captured in particle-based simulations and rationalized by using mesoscopic descriptions. This allows to understand the underlying dynamics and to reproduce the resulting non-linear rheological behaviours.
[1] D. A. Matoz-Fernandez, E. Agoritsas, J.-L. Barrat, E. Bertin and K. Martens, Nonlinear Rheology in a Model Biological Tissue, PRL, 118, 158105 (2017).
[2] D. A. Matoz-Fernandez, K. Martens, R. Sknepnek, J.-L. Barrat and S. Henkes, Cell Division and Death Inhibit Glassy Behaviour of Confluent Tissues, Soft matter, 13, 3205 (2017).
[3] M. Le Goff, V. Vasisht and K. Martens, Vibration Induced Fluidization of Yield Stress Materials, to be submitted soon.