Timedependent poisson’s ratio of polypropylene compounds for various strain histories
 Daniel Tscharnuter,
 Michael Jerabek,
 Zoltan Major,
 Reinhold W. Lang
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Due to the viscoelastic behavior of polymers mechanical properties are strongly affected by the loading history. To obtain the timedependent Poisson’s ratio without further data manipulation, stress relaxation tests have to be carried out. Only few results for viscoelastic materials have been published to date, but the theory of Poisson’s ratio in the framework of linear viscoelasticity has received some attention with respect to loading histories other than relaxation, i.e. creep and constant rate of strain tests.
The main objective of this work is to compare the potential of different testing methods to determine Poisson’s ratio. Transverse and axial strain have been measured in relaxation tests, creep experiments and displacement rate controlled tensile tests. Relaxation tests are evaluated accounting for the finite loading time and the results are compared with those of tensile creep and displacement rate controlled tensile tests. An optimization based method to determine linear viscoelastic material functions developed previously is applied to calculate Poisson’s ratio.
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 Title
 Timedependent poisson’s ratio of polypropylene compounds for various strain histories
 Journal

Mechanics of TimeDependent Materials
Volume 15, Issue 1 , pp 1528
 Cover Date
 20110201
 DOI
 10.1007/s110430109121x
 Print ISSN
 13852000
 Online ISSN
 15732738
 Publisher
 Springer Netherlands
 Additional Links
 Topics
 Keywords

 Poisson’s ratio
 Linear viscoelasticity
 Lateral contraction
 Time dependence
 Industry Sectors
 Authors

 Daniel Tscharnuter ^{(1)}
 Michael Jerabek ^{(1)} ^{(2)}
 Zoltan Major ^{(3)} ^{(4)}
 Reinhold W. Lang ^{(3)} ^{(5)}
 Author Affiliations

 1. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700, Leoben, Austria
 2. Borealis Polyolefine GmbH, St. Peter Strasse 25, 4021, Linz, Austria
 3. Institute of Materials Science and Testing of Plastics, FranzJosefStrasse 18, 8700, Leoben, Austria
 4. Institute of Polymer Product Engineering, Johannes Kepler University Linz, Altenbergerstrasse 69, 4021, Linz, Austria
 5. Institute of Polymeric Materials and Testing, Johannes Kepler University Linz, Altenbergerstrasse 69, 4021, Linz, Austria