Study of Time-Dependent Properties of Thermoplastics
German Institute for Polymers (DKI),
2 Martin-Luther-Universität Halle-Wittenberg, Lehrstuhl fūr Technische Mechanik, D-06099 Halle
a e-mail : VKolupaev@dki.tu-darmstadt.de
Simple tests carried out with a common tension/compression testing machine are used to obtain timedependent properties of non-reinforced thermoplastics. These tests include ramp loadings as well as relaxation and creep tests. Two materials (PBT Celanex 2002-2 and POM Hostaform C9021, Ticona GmbH, Kelsterbach) were taken for the experiments. The experiments show that an adequate description of the long-term material properties can be obtained from the short-time tests, namely from tests with constant traverse speed .
Below a model for the time-dependent mechanical behavior is presented and fitted to the obtained measured data. For the evaluation of the fitting quality long-term tests are used. Especially creep and relaxation tests with ”jumps”, i.e. rapid change of loading, are important for this purpose.
© Owned by the authors, published by EDP Sciences, 2010