Modelling of viscoelastic material behaviour close to the glass transition temperature |
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| Authors: | Michael Johlitz Stefan Diebels Alexander Lion Wulff Possart |
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| Institution: | 1. Universität des Saarlandes, Lehrstuhl für Technische Mechanik, Geb. A4.2, D-66123 Saarbrücken;2. Institut für Mechanik, Universität der Bundeswehr München, Fakultät für Luft-und Raumfahrttechnik, D-85579 Neubiberg;3. Universität des Saarlandes, Lehrstuhl für Adhäsion und Interphasen in Polymeren, Geb. C6.3, D-66123 Saarbrücken |
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| Abstract: | 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) |
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