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- Title
Rheological properties vs. local dynamics in model disordered materials at low temperature.
- Authors
Fusco, C.; Albaret, T.; Tanguy, A.
- Abstract
We study the rheological response at low temperature of a sheared model disordered material as a function of the bond rigidity. We find that the flow curves follow a Herschel-Bulkley law, whatever is the bond rigidity, with an exponent close to 0.5. Interestingly, the apparent viscosity can be related to a single relevant time scale t , suggesting a strong connection between the local dynamics and the global mechanical behaviour. We propose a model based on the competition between the nucleation and the avalanche-like propagation of spatial strain heterogeneities. This model can explain the Herschel-Bulkley exponent on the basis of the size dependence of the heterogeneities on the shear rate. Graphical abstract:
- Subjects
RHEOLOGY; MATERIALS at low temperatures; HERSCHEL-Bulkley model; GEOMETRIC rigidity; VISCOSITY; NUCLEATION; STRAINS &; stresses (Mechanics)
- Publication
European Physical Journal E -- Soft Matter, 2014, Vol 37, Issue 5, p1
- ISSN
1292-8941
- Publication type
Article
- DOI
10.1140/epje/i2014-14043-0