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Issue 15, 2012
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Schematic mode coupling theory of glass rheology: single and double step strains

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Abstract

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.

Graphical abstract: Schematic mode coupling theory of glass rheology: single and double step strains

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Publication details

The article was received on 04 Oct 2011, accepted on 05 Jan 2012 and first published on 03 Feb 2012


Article type: Paper
DOI: 10.1039/C2SM06891E
Citation: Soft Matter, 2012,8, 4244-4253
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    Schematic mode coupling theory of glass rheology: single and double step strains

    Th. Voigtmann, J. M. Brader, M. Fuchs and M. E. Cates, Soft Matter, 2012, 8, 4244
    DOI: 10.1039/C2SM06891E

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