A novel technique for conducting creep experiments in equibiaxial elongation

Rebecca M. Mick, David C. Venerus

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A recently developed rheological technique known as continuous lubricated squeezing flow (CLSF) is adapted to perform constant stress, or creep, experiments in equibiaxial elongation flows of polymer melts. By modifying the CLSF technique, which was developed for constant strain rate deformations, we demonstrate that the technique can also be used to generate constant stress flows. Measured steady state viscosities are compared to constant rate elongation results for polymer melts having different molecular characteristics. Linear polymers show strain softening and compare well in constant stress and constant strain rate deformations. The branched polymer shows strain hardening and a viscosity that is slightly higher in constant stress for low rates. Limitations of the current version of the CLSF technique for creep flows are also briefly discussed.

Original languageEnglish (US)
Pages (from-to)591-596
Number of pages6
JournalRheologica Acta
Volume56
Issue number6
DOIs
StatePublished - Jun 1 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Constant stress
  • Creep
  • Equibiaxial elongation
  • Polymer melt

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