Frieze group analysis of asymmetric response to large-amplitude oscillatory shear

S. A. Rogers, D. Vlassopoulos

Research output: Contribution to journalArticlepeer-review


Several attempts have been made recently to develop universal analysis techniques for the stress response to large-amplitude oscillatory shear (LAOS) in a variety of materials from viscous and viscoelastic to viscoplastic. All previous attempts have assumed, tacitly or otherwise, that such responses display a minimum number of symmetries in stress/strain. We present the stress response to LAOS of a glassy suspension of multiarm star polymers, which exhibits a complete lack of any type of symmetry during the 10 000 s experimental window. We also present new physical interpretations of previously defined parameters and conjecture that the lack of symmetry observed in the stress response is a consequence of the aging process, which can be viewed as slow cage rearrangement and evolution of heterogeneities.

Original languageEnglish (US)
Pages (from-to)859-880
Number of pages22
JournalJournal of Rheology
Issue number4
StatePublished - Jul 2010
Externally publishedYes


  • Asymmetry
  • Chebyshev
  • Colloidal glass
  • Frieze
  • LAOS
  • Star polymer

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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