Giant fluctuations in the flow of fluidised soft glassy materials: an elasto-plastic modelling approach
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2019
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| _version_ | 1866918275714121728 |
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| author | Goff, Magali Le Bertin, Eric Martens, Kirsten |
| author_facet | Goff, Magali Le Bertin, Eric Martens, Kirsten |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1911_01259 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Giant fluctuations in the flow of fluidised soft glassy materials: an elasto-plastic modelling approach Goff, Magali Le Bertin, Eric Martens, Kirsten Soft Condensed Matter Statistical Mechanics 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. |
| title | Giant fluctuations in the flow of fluidised soft glassy materials: an elasto-plastic modelling approach |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/1911.01259 |