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  Flow heterogeneity and correlations in a sheared hard sphere glass: Insight from computer simulations

Mandal, S., Gross, M., Raabe, D., & Varnik, F. (2013). Flow heterogeneity and correlations in a sheared hard sphere glass: Insight from computer simulations. In AIP Conference Proceedings (pp. 266-271).

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E3D7-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E3D8-B
Genre: Conference Paper

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 Creators:
Mandal, Suvendu1, Author              
Gross, Markus2, Author              
Raabe, Dierk3, Author              
Varnik, Fathollah4, Author              
Affiliations:
1Theory and Simulation of Complex Fluids, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863393              
2Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, Universitaetsstr. 90a, 44789 Bochum, Germany, persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany, ou_persistent22              

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 Abstract: Understanding the origin of flow heterogeneity in glassy systems is of high interest both due to its importance from theoretical standpoint as well as due to its occurrence in a large number of practical situations such as the flow of the so-called soft-glassy materials (foams, colloidal suspensions, granular media, etc). Detailed experimental investigations do indeed confirm that the flow of driven amorphous solids is not homogeneous, even if the macroscopic stress is constant across the system. We study this issue via large scale event driven molecular dynamics simulations of a hard sphere glass. We observe significant fluctuations of the velocity profile with a time scale of the order of a few hundreds percent strain. Furthermore, there appears to be a correlation between the fluctuations of the local volume fraction and the fluctuations of the local shear rate. The time scales of the fluctuations of density and shear rate are practically identical. These observations motivate an interpretation of our results via the shear concentration coupling (SCC) theory. A detailed comparison, however, reveals serious inconsistencies. In particular, the amplitude of the fluctuations of the shear rate seems to be decoupled from that of density, a feature which is rather unexpected within the SCC picture. An alternative interpretation of our observations is also discussed invoking dynamic heterogeneity. © 2013 American Institute of Physics.

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Language(s): eng - English
 Dates: 2013
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1063/1.4794578
BibTex Citekey: Mandal2013266
ISSN: 0094243X
ISBN: 978-073541141-8
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Title: 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku
Place of Event: Sendai, Japan
Start-/End Date: 2013-12-02 - 2013-12-07

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Title: AIP Conference Proceedings
Source Genre: Proceedings
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Pages: - Volume / Issue: 1518 Sequence Number: - Start / End Page: 266 - 271 Identifier: -