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Modelling of viscoelastic material behaviour close to the glass transition temperature
Author(s) -
Johlitz Michael,
Diebels Stefan,
Lion Alexander,
Possart Wulff
Publication year - 2009
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200910149
Subject(s) - viscoelasticity , materials science , glass transition , isothermal process , relaxation (psychology) , thermodynamics , constant (computer programming) , atmospheric temperature range , standard linear solid model , composite material , polymer , physics , computer science , psychology , social psychology , programming language
In this contribution we investigate the mechanical behaviour of polyurethane over a range of different but constant temperatures from the glass to the viscoelastic state. Therefore uniaxial tension tests are performed on dogbone specimens under different isothermal conditions. In this manner an experimental data set is provided. As a theoretical basis we present the well known thermomechanically coupled one dimensional linear viscoelastic material model which is able to display the experimentally observed material behaviour. For this we adopt temperature dependent relaxation times. The introduced model parameters are identified via a standard parameter identification tool. Finally, the experimental results are compared with the ones of simulations of the identified model parameters. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)