Defect-mediated creep of structured materials

R. H. Colby, L. M. Nentwich, S. R. Clingman, C. K. Ober

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Low-stress creep measurements on a nematic liquid crystal polymer indicate that it is a viscoelastic solid, with a modulus of 100 dynes/cm2 and a yield stress of 50 dynes/cm2. 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.

Original languageEnglish (US)
Pages (from-to)269-274
Number of pages6
JournalEurophysics Letters
Issue number2
StatePublished - Apr 11 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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