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Stress fluctuations in transient active networks

Goldstein, Daniel and Ramaswamy, Sriram and Chakraborty, Bulbul (2019) Stress fluctuations in transient active networks. In: SOFT MATTER, 15 (17). pp. 3520-3526.

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Official URL: https://dx.doi.org/10.1039/c9sm00205g


Inspired by experiments on dynamic extensile gels of biofilaments and motors, we propose a model of a network of linear springs with kinetics consisting of growth at a prescribed rate, death after a lifetime drawn from a distribution, and birth at a randomly chosen node. The model captures features such as the build-up of self-stress, that are not easily incorporated into hydrodynamic theories. We study the model numerically and show that our observations can largely be understood through a stochastic effective-medium model. The resulting dynamically extending force-dipole network displays many features of yielded plastic solids, and offers a way to incorporate strongly non-affine effects into theories of active solids. A rather distinctive form for the stress distribution, and a Herschel-Bulkley dependence of stress on activity, are our major predictions.

Item Type: Journal Article
Publication: SOFT MATTER
Additional Information: copyright for this article belongs to ROYAL SOC CHEMISTRY
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 13 Sep 2019 11:10
Last Modified: 13 Sep 2019 11:10
URI: http://eprints.iisc.ac.in/id/eprint/63200

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