Department of Physics Papers

Document Type

Journal Article

Date of this Version

8-8-2008

Comments

Suggested Citation:
O. Stenull, T.C. Lubensky, J.M. Adams and M. Warner. (2008). "Smectic-C tilt under shear in smectic-A elastomers." Physical Review E. 78, 021705.

© 2008 The American Physical Society
http://dx.doi.org/10.1103/PhysRevE.78.021705

Abstract

Stenull and Lubensky [Phys. Rev. E 76, 011706 (2007)] have argued that shear strain and tilt of the director relative to the layer normal are coupled in smectic elastomers and that the imposition of one necessarily leads to the development of the other. This means, in particular, that a smectic-A elastomer subjected to a simple shear will develop smectic-C-like tilt of the director. Recently, Kramer and Finkelmann [e-print arXiv:0708.2024; Phys. Rev. E 78, 021704 (2008)], performed shear experiments on smectic-A elastomers using two different shear geometries. One of the experiments, which implements simple shear, produces clear evidence for the development of smectic-C-like tilt. Here, we generalize a model for smectic elastomers introduced by Adams and Warner [Phys. Rev. E 71, 021708 (2005)] and use it to study the magnitude of SmC-like tilt under shear for the two geometries investigated by Kramer and Finkelmann. Using reasonable estimates of model parameters, we estimate the tilt angle for both geometries, and we compare our estimates to the experimental results. The other shear geometry is problematic since it introduces additional in-plane compressions in a sheetlike sample, thus inducing instabilities that we discuss.

 

Date Posted: 13 January 2011

This document has been peer reviewed.