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Title: Stochastic rate-dependent elasticity and failure of soft fibrous networks
Authors: Abhilash, A.S.
Purohit, P.K.
Joshi, S.P. 
Issue Date: 14-Jul-2012
Citation: Abhilash, A.S., Purohit, P.K., Joshi, S.P. (2012-07-14). Stochastic rate-dependent elasticity and failure of soft fibrous networks. Soft Matter 8 (26) : 7004-7016. ScholarBank@NUS Repository.
Abstract: This work focuses on modeling the rate-sensitive stiffening-to-softening transition in fibrous architectures mimicking crosslinked fibrous actin (F-actin) networks induced by crosslink unbinding. Using finite element based discrete network (DN) modeling combined with stochastic crosslink scission kinetics, we correlate the microstructural damage evolution with the macroscopic stress-strain responses of these networks as a function of applied deformation rate. Simulations of multiple DN realizations for fixed filament density indicate that an incubation strain exists, which characterizes the minimum macroscopic deformation that a network should accrue before damage initiates. This incubation strain exhibits a direct relationship with the applied strain rate. Simulations predict that the critical damage fraction corresponding to colossal softening is quite low, which may be ascribed to the network non-affinity and filament reorientation. Furthermore, this critical fraction appears to be independent of applied strain rate. Based on these characteristics, we propose a phenomenological damage evolution law mimicking scission kinetics in an average sense. This law is embedded within an existing continuum model that is extended to include non-affine effects induced by filament bending. © The Royal Society of Chemistry.
Source Title: Soft Matter
ISSN: 1744683X
DOI: 10.1039/c2sm25450f
Appears in Collections:Staff Publications

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