Relaxation of shear and normal stress components in step-strain experiments

C. M. Vrentas, W. W. Graessley

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40 Scopus citations


The relaxation of torque and axial thrust following a rapidly imposed step in shear strain ( 0 < γ ≤ 3.33) was measured for several undiluted polymers and polymer solutions using the cone-and-plate geometry in a Rheometrics mechanical spectrometer. Instrumental response times were favorable for calculating both the shear stress σ(γ, t) and the first normal stress difference N1(γ,t) from torque and thrust data on two of the solutions. Those results confirm the relationship N1(γ,t) = γσ(γ, t). Apparent departures from this relationship appear if σ(γ,t) and N1(σ, t are calculated from torque and thrust data when the instrumental response criteria are not met.

Original languageEnglish (US)
Pages (from-to)339-355
Number of pages17
JournalJournal of Non-Newtonian Fluid Mechanics
Issue number3-4
StatePublished - 1981

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics


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