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Thermo-Mechanical Application Limits of Plastics

Methods for the determination of thermal application limits under static and dyna-mic loads are presented and compared. For the determination of thermal applica-tion limits at long term static load models are developed to describe the long term deformation behaviour time-, temperature- and stress dependent up to the region of non-linear viscoelasticity in a closed form based on comparatively short creep measurements. As a criterion for thermal application limits a critical strain is applied. To this approach the commonly used method to determine thermal applica-tion limits from shear modulus curves from DMA-measurements is compared. By employing a heavy duty DMA dynamic loads up to the non-linear region can be applied to specimen and thus deviating curve progressions can be determined and compared to tensile tests. It is shown that commonly used DMA-measurements in the range of linear viscoelasticity result in optimistic application limits. The reasons are analyzed and improved estimations are suggested.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Claus Dallner

Claus Dallner
Lehrstuhl für Kunststofftechnik
Universität Erlangen-Nürnberg

Information

Free keywords: Application limit, non-linear viscoelastic, dynamic mechanical analysis, creep
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein (Betreuer), Prof. Dr.-Ing. Igor Emri, Prof. Dr. rer. nat. Helmut Münstedt
Publication year: 2008
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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