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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. Royal Society of Chemistry. doi: 10.1039/C2SM06891E.

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Official URL: http://pubs.rsc.org/en/content/articlelanding/2012/sm/c2sm06891e


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.

Item URL in elib:https://elib.dlr.de/76034/
Document Type:Article
Title:Schematic mode coupling theory of glass rheology: single and double step strains.
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Brader, J. M.University of Fribourg, SwitzerlandUNSPECIFIEDUNSPECIFIED
Fuchs, M.University of Konstanz, GermanyUNSPECIFIEDUNSPECIFIED
Cates, M. E.University of Edinburgh, Scotland, UKUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Soft Matter
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 4244-4253
Publisher:Royal Society of Chemistry
Keywords:colloidal glasses, rheology, double step strain, constitutive equations
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:20 Jun 2012 12:21
Last Modified:06 Sep 2019 15:20

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