The non-linear viscoelastic response of polycarbonate in torsion: An investigation of time-temperature and time-strain superposition

P. A. O'Connell, G. B. McKenna

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

Data are presented from torsional stress relaxation experiments on a commercial polycarbonate. Tests were performed on samples over a range of torsional strains from 0.0025 to 0.08 and at temperatures from 30 to 110°C at a fixed aging time of 64,800 s (18 h). Following the scaling approach of Penn and Kearsley [Trans. Soc. Rheol. 20 (1976)] we were able to determine the stress relaxation response at shear strains to 0.07. Then the individual data sets at each strain and temperature could be described using a stretched exponential form relaxation function. Over the range of temperatures studied the data at each strain were superimposed using conventional time-temperature superposition. For strains up to the yield strain the data at each temperature could also be superimposed to form a master curve following the principle of time-strain superposition. Interestingly, the master curves found from time-strain superposition at each temperature did not have the same form. Similarly, the master curves found from time-temperature superposition at each strain did not have the same form.

Original languageEnglish
Pages (from-to)207-229
Number of pages23
JournalMechanics Time-Dependent Materials
Volume6
Issue number3
DOIs
StatePublished - 2002

Keywords

  • Glass transition
  • KWW function
  • Non-linear viscoelasticity
  • Polycarbonate
  • Polymer glass
  • Stress relaxation
  • Thermoplastic
  • Time-strain superposition
  • Time-temperature superposition

Fingerprint Dive into the research topics of 'The non-linear viscoelastic response of polycarbonate in torsion: An investigation of time-temperature and time-strain superposition'. Together they form a unique fingerprint.

  • Cite this