Giant fluctuations in the flow of fluidised soft glassy materials: an elasto-plastic modelling approach
arXiv:1911.01259 · doi:10.1088/2515-7639/ab6e46
Abstract
In this work we study the rheological features of yield stress materials that exhibit non-homogeneous steady flows and that are subjected to an additional mechanical noise. Using a mesoscale elasto-plastic model accounting for a viscosity bifurcation in the flow response to an external shear stress, we find that additional sources of noise can lead to a fluidisation effect. As we increase the noise intensity we evidence a transition from a non-monotonic to a monotonic rheology, associated with giant fluctuations of the macroscopic shear rate and long-time correlated dynamics. Although distinct noise models can lead to different rheological behaviours in the low stress regime, we show that the noise-induced transition from shear-localised to homogeneous flow at higher stresses appears very generic. The observed features in the dynamics can be interpreted as a result of an out-of-equilibrium phase transition, for which we estimate the critical exponents that appear to be independent of the specific choice of the noise implementation for the microscopic dynamics.
arXiv comment12 pages, 12 figures
References in corpus (31)
- Yield Stress Materials in Soft Condensed Matter
- A kinetic theory of plastic flow in soft glassy materials
- Unified study of glass and jamming rheology in soft particle systems
- A mode-coupling theory for the pasty rheology of soft glassy materials
- Observing Brownian motion in vibration-fluidized granular matter
- Slow flows of yield stress fluids: complex spatio-temporal behaviour within a simple elasto-plastic model
- Driving rate dependence of avalanche statistics and shapes at the yielding transition
- On the density of shear transformation zones in amorphous solids
- Spontaneous formation of permanent shear bands in a mesoscopic model of flowing disordered matter
- Shear banding in soft glassy materials
- Connecting diffusion and dynamical heterogeneities in actively deformed amorphous systems
- Active fluidization in dense glassy systems
- Local and global avalanches in a 2D sheared granular medium
- Friction law and hysteresis in granular materials
- Effects of inertia on the steady-shear rheology of disordered solids
- Universal, additive effect of temperature on the rheology of amorphous solids
- Criticality in elastoplastic models of amorphous solids with stress-dependent yielding rates
- Nonlinear Rheology in a Model Biological Tissue
- An elastic, plastic, viscous model for slow shear of a liquid foam
- Discontinuous fluidisation transition in assemblies of actively-deforming particles: A new paradigm for collective motion in dense active materials
- Rheology of athermal amorphous solids: Revisiting simplified scenarios and the concept of mechanical noise temperature
- Stokes experiment in a liquid foam
- Flow-Arrest Transitions in Frictional Granular Matter
- Rheology of Weakly Vibrated Granular Media
- Rheo-acoustic gels: Tuning mechanical and flow properties of colloidal gels with ultrasonic vibrations
- Creep dynamics of athermal amorphous materials: a mesoscopic approach
- Criticality in vibrated frictional flows at finite strain rate
- Diffusion in mesoscopic lattice models of amorphous plasticity
- Unified rheology of vibro-fluidized dry granular media: From slow dense flows to fast gas-like regimes
- 'Flow & Jam' of frictional athermal systems under shear stress
- Criticality at finite strain rate in fluidized soft glassy materials