Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 7, 2019
Previous Article Next Article

Normal stress anisotropy and marginal stability in athermal elastic networks

Author affiliations

Abstract

Hydrogels of semiflexible biopolymers such as collagen have been shown to contract axially under shear strain, in contrast to the axial dilation observed for most elastic materials. Recent work has shown that this behavior can be understood in terms of the porous, two-component nature and consequent time-dependent compressibility of hydrogels. The apparent normal stress measured by a torsional rheometer reflects only the tensile contribution of the axial component σzz on long (compressible) timescales, crossing over to the first normal stress difference, N1 = σxxσzz at short (incompressible) times. While the behavior of N1 is well understood for isotropic viscoelastic materials undergoing affine shear deformation, biopolymer networks are often anisotropic and deform nonaffinely. Here, we numerically study the normal stresses that arise under shear in subisostatic, athermal semiflexible polymer networks. We show that such systems exhibit strong deviations from affine behavior and that these anomalies are controlled by a rigidity transition as a function of strain.

Graphical abstract: Normal stress anisotropy and marginal stability in athermal elastic networks

Back to tab navigation

Supplementary files

Article information


Submitted
26 Oct 2018
Accepted
15 Jan 2019
First published
21 Jan 2019

Soft Matter, 2019,15, 1666-1675
Article type
Paper
Author version available

Normal stress anisotropy and marginal stability in athermal elastic networks

J. L. Shivers, J. Feng, A. Sharma and F. C. MacKintosh, Soft Matter, 2019, 15, 1666
DOI: 10.1039/C8SM02192A

Social activity

Search articles by author

Spotlight

Advertisements