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Slow creep in soft granular packings

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Abstract

Transient creep mechanisms in soft granular packings are studied numerically using a constant pressure and constant stress simulation method. Rapid compression followed by slow dilation is predicted on the basis of a logarithmic creep phenomenon. Characteristic scales of creep strain and time exhibit a power-law dependence on jamming pressure, and they diverge at the jamming point. Microscopic analysis indicates the existence of a correlation between rheology and nonaffine fluctuations. Localized regions of large strain appear during creep and grow in magnitude and size at short times. At long times, the spatial structure of highly correlated local deformation becomes time-invariant. Finally, a microscale connection between local rheology and local fluctuations is demonstrated in the form of a linear scaling between granular fluidity and nonaffine velocity.

Graphical abstract: Slow creep in soft granular packings

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Publication details

The article was received on 02 Feb 2017, accepted on 08 Apr 2017 and first published on 10 Apr 2017


Article type: Paper
DOI: 10.1039/C7SM00237H
Citation: Soft Matter, 2017, Advance Article
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    Slow creep in soft granular packings

    I. Srivastava and T. S. Fisher, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00237H

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