Volume 54, Number 2, April 2001
|Page(s)||269 - 274|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
Defect-mediated creep of structured materials
Materials Science and Engineering, Pennsylvania State University
University Park, PA 16802, USA
2 James Franck Institute, University of Chicago - Chicago, IL 60637, USA
3 Materials Science and Engineering, Cornell University - Ithaca, NY 14853, USA
Accepted: 13 February 2001
Low-stress creep measurements on a nematic liquid crystal polymer indicate that it is a viscoelastic solid, with a modulus of and a yield stress of . Both smectics and nematics are viscoelastic solids at very low stress levels, with a modulus that is related to their defect texture. At stress levels somewhat above the yield stress, there is a yielding regime where the deformation rate and defect spacing are power laws in the applied stress. We understand these power laws using the ideas developed long ago by Orowan for the motion of line defects in crystalline solids. The exponents of these power laws are different for nematics and smectics, but the nematic universality class also appears to apply to superplastic metals and ceramics.
PACS: 83.80.Xz – Liquid crystals: nematic, cholesteric, smectic, discotic, etc / 61.30.Jf – Defects in liquid crystals / 62.20.Fe – Deformation and plasticity (including yield, ductility, and superplasticity)
© EDP Sciences, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.