Consistency tests for start-up and cessation deformations of viscoelastic fluids

J. S. Vrentas, D. C. Venerus, C. M. Vrentas

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The time-dependent shear stress and first normal stress difference were measured for a polystyrene solution for start-up and cessation-flow experiments over a relatively wide range of shear rate. Consistency tests for the K-BKZ model were applied to the data, and it was concluded that the K-BKZ equation generally does not satisfactorily describe the start-up and cessation data. Modified consistency tests were developed using a strain-coupling constitutive equation, and the evidence suggests that most of the differences between the predictions of the K-BKZ theory and experiment can be explained by including a strain-coupling effect in the rheological constitutive equation.

Original languageEnglish (US)
Pages (from-to)298-309
Number of pages12
JournalRheologica Acta
Issue number4
StatePublished - Jul 1990
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Chemical Engineering (miscellaneous)
  • General Materials Science


  • K-BKZ model
  • cessation experiments
  • consistency relations
  • start-up experiments
  • strain coupling


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