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Thermal Stresses in Thermoplastic Parts

The growth of thermally induced stresses is overlaid by a temperature and time depending stress relaxation. For the exact prediction of the thermal stress behavior a non-linear viscoelastic material model is needed.

In this thesis a material model is presented which simulates thermally induced stresses considering the temperature depending material behavior as well as the material relaxation based on an extended spring/dashpot model. Isothermal tensile tests with constant strain rate are used for calibration.

The temperature behavior is solely coming from the flow behavior of the molecule chains, a temperature dependency of the elastic behavior cannot be proven. This is reflected in the modeling accordingly.

It is shown that time-temperature shifting according Arrhenius is usable. The simulations results are proven by experiments and the material model is used successfully to simulate cyclic temperature changes as well as an example of a snap-fit.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author

Nils Schöche
Institut für Kunststoffe im Maschinenbau
Universität - Gesamthochschule Essen

Information

Free keywords: Thermoplastic, thermal, stress, nonlinear, viscoelastic, simulation, spring, dashpot, model, relaxation, Arrhenius, temperature cycle
Institute / chair: Fachbereich 12 der Universität Gesamthochschule Essen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Ernst Schmachtenberg (Betreuer), Prof. Dr.-Ing. Walter Michaeli
Publication year: 1997
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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