Advertisement

Rheology pp 363-368 | Cite as

Interpretation of the Stress Relaxation Behaviour of Plasticized PVC Using a Cooperative Model

  • Josef Kubát
  • Lars-Åke Nilsson
  • Mikael Rigdahl

Abstract

It has been reported earlier [1–3] that the stress relaxation behaviour of different materials is largely the same. For instance, the initial part of the relaxation process obeys an exponential relation between rate and stress (σ), while at longer times a power type relation is observed. The slope (F) of the relaxation curves when plotted as stress vs. In (time) is, in the exponential region, related to the initial stress (σ0) as
$$F = o.1({\sigma _0} - {\sigma _i}), $$
(1)
the scatter of the constant being ca. 10 %. In eq.(1) σ1- denotes the internal stress, which in this context is equivalent to the equilibrium stress reached after a sufficiently long measuring time. Eq.(l) has been found to be valid for metals, polymers and a number of other materials [1–3].

Keywords

Stress Relaxation Initial Stress Vinyl Chloride Relaxation Curve Flow Unit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    J. Kubát and M. Rigdahl, Mater. Sci. Eng., 24:223 (1976).CrossRefGoogle Scholar
  2. 2.
    J. Kubát, M. Rigdahl and R. Seiden, Phys. stat. sol. (a), 50:117 (1978).CrossRefGoogle Scholar
  3. 3.
    J. Kubát, M. Rigdahl and R. Seiden, in “Proc. Mechanisms of Deformation and Fracture,” K. E. Easterling, ed., Pergamon Press (1979) p. 297.Google Scholar
  4. 4.
    J. Kubát, Ark. Fysik, 25:285(1963).Google Scholar
  5. 5.
    M. C. Shen and A. V. Tobolsky, in “Plasticification and Plasticizer Processes,” R. F. Gould, ed., Advances in Chemistry Series, (N. A. J. Platzer, symp. chairman), Amer. Chem. Soc, Washington, D. C. (1965) p. 118.Google Scholar
  6. 6.
    L. L. Chapoy and A. V. Tobolsky, Chem. Scripta, 2:44 (1972).Google Scholar
  7. 7.
    J. J. Aklonis and V. B. Rele, J. Polym. Sci., Symp. No. 46:127 (1974).CrossRefGoogle Scholar
  8. 8.
    B. Hagström, J. Kubát and M. Rigdahl, to be published.Google Scholar
  9. 9.
    J. E. Dorn, J. Mech. Phys. Solids, 4:85 (1954).Google Scholar
  10. 10.
    H. Conrad, Acta Metall., 6:339(1958).Google Scholar
  11. 11.
    C. Högfors and J. Kubát, to be published.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Josef Kubát
    • 1
  • Lars-Åke Nilsson
    • 1
  • Mikael Rigdahl
    • 1
  1. 1.Department of Polymeric MaterialsChalmers University of TechnologyGothenburgSweden

Personalised recommendations