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Mechanics of Time-Dependent Materials

, Volume 15, Issue 1, pp 1–14 | Cite as

On the determination of the relaxation modulus of PP compounds from arbitrary strain histories

  • Daniel TscharnuterEmail author
  • Michael Jerabek
  • Zoltan Major
  • Reinhold W. Lang
Article

Abstract

Advanced evaluation methods for the determination of linear viscoelastic material functions have been developed already forty years ago, but it is still common practice to use the so-called ten-times rule. The rule is that a sufficiently long time needs to pass after a constant load or strain is applied so that the material response is close to the response of step excitation. A substantial amount of experimental data in the short-term range has to be discarded to obtain valid results. Renewed attention has been given to improving this situation during the last few years. In this paper, the application of modern evaluation techniques to the determination of the relaxation modulus of isotropic homogeneous linear viscoelastic materials is presented. A new method that is applicable to general strain histories is introduced and applied to different loading types.

Keywords

Viscoelastic behavior Ramp loading Relaxation test Creep test Relaxation modulus 

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Copyright information

© Springer Science+Business Media, B. V. 2010

Authors and Affiliations

  • Daniel Tscharnuter
    • 1
    Email author
  • Michael Jerabek
    • 1
    • 2
  • Zoltan Major
    • 3
    • 4
  • Reinhold W. Lang
    • 3
    • 5
  1. 1.Polymer Competence Center Leoben GmbHLeobenAustria
  2. 2.Borealis Polyolefine GmbHLinzAustria
  3. 3.Institute of Materials Science and Testing of PlasticsLeobenAustria
  4. 4.Institute of Polymer Product EngineeringJohannes Kepler University LinzLinzAustria
  5. 5.Institute of Polymeric Materials and TestingJohannes Kepler University LinzLinzAustria

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