Schematic mode coupling theory of glass rheology: single and double step strains.
Voigtmann, Th. and Brader, J. M. and Fuchs, M. and Cates, M. E. (2012) Schematic mode coupling theory of glass rheology: single and double step strains. Soft Matter, 8, pp. 4244-4253. DOI: 10.1039/C2SM06891E.
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Mode coupling theory (MCT) has had notable successes in addressing the rheology of hard-sphere colloidal glasses, and also soft colloidal glasses such as star-polymers. Here, we explore the properties of a recently developed MCT-based schematic constitutive equation under idealized experimental protocols involving single and then double step strains. We find strong deviations from expectations based on factorable, BKZ-type constitutive models. Specifically, a nonvanishing stress remains long after the application of two equal and opposite step strains; this residual stress is a signature of plastic deformation. We also discuss the distinction between hypothetically instantaneous step strains and fast ramps. These are not generally equivalent in our MCT approach, with the latter more likely to capture the physics of experimental ‘step’ strains. The distinction points to the different role played by reversible anelastic, and irreversible plastic rearrangements.
|Title:||Schematic mode coupling theory of glass rheology: single and double step strains.|
|Journal or Publication Title:||Soft Matter|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 4244-4253|
|Keywords:||colloidal glasses, rheology, double step strain, constitutive equations|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialforschung unter Mikro-g|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Dr.rer.nat. Thomas Voigtmann|
|Deposited On:||20 Jun 2012 12:21|
|Last Modified:||04 Apr 2013 16:37|
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