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Slow Coarsening in Jammed Athermal Soft Particle Suspensions

Chacko, R. N.; Sollich, P.; Fielding, S. M.

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Authors

R. N. Chacko

P. Sollich



Abstract

We simulate a densely jammed, athermal assembly of repulsive soft particles immersed in a solvent. Starting from an initial condition corresponding to a quench from a high temperature, we find nontrivial slow dynamics driven by a gradual release of stored elastic energy, with the root mean squared particle speed decaying as a power law in time with a fractional exponent. This decay is accompanied by the presence within the assembly of spatially localized and temporally intermittent “hot spots” of nonaffine deformation, connected by long-ranged swirls in the velocity field, reminiscent of the local plastic events and long-ranged elastic propagation that have been intensively studied in sheared amorphous materials. The pattern of hot spots progressively coarsens, with the hot-spot size and separation slowly growing over time, and the associated correlation length in particle speed increasing as a sublinear power law. Each individual spot, however, exists only transiently within an overall picture of strongly intermittent dynamics.

Citation

Chacko, R., Sollich, P., & Fielding, S. (2019). Slow Coarsening in Jammed Athermal Soft Particle Suspensions. Physical Review Letters, 123(10), Article 108001. https://doi.org/10.1103/physrevlett.123.108001

Journal Article Type Article
Acceptance Date Aug 7, 2019
Online Publication Date Sep 4, 2019
Publication Date Sep 6, 2019
Deposit Date Sep 10, 2019
Publicly Available Date Mar 29, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 123
Issue 10
Article Number 108001
DOI https://doi.org/10.1103/physrevlett.123.108001

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Copyright Statement
Reprinted with permission from the American Physical Society: Chacko, R. N., Sollich, P. & Fielding, S. M. (2019). Slow Coarsening in Jammed Athermal Soft Particle Suspensions. Physical Review Letters 123(10): 108001 © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.





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