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Fatigue behavior of glass reinforced thermosets

Today, glass fibre reinforced plastics (gfrp) are widely used in components exposed to high dynamical loads, for example in transportation and wind turbine applications. A life cycle of more than 10 years is expected for these products and therefore a high reliability in fatigue life prediction is required. Methods approved for metals and for carbon fiber reinforced plastics are insufficient and can not be applied due to the fact that these methods do not allow for the description of the specific fatigue behavior of gfrp. Based on the evaluation of the stiffness loss, a method is introduced that allows the prediction of fatigue load limits for dynamically loaded materials with minimal experimental effort. This method was sucessfully applied to fiber reinforced materials with a brittle matrix (glass fiber reinforced polyester and epoxy resins, SMC). For fiber reinforced materials with a ductile matrix behavior (vinylester resins, toughened epoxy resins) an approach is introduced, which must be verified by experimental investigations. An optimized experimental plan opens a great potential to further improve the method.

In the future, an estimation of the fatigue life based on the introduced method should be possible for arbitrary load-time-functions.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author

Leo Hoffmann
Lehrstuhl für Kunststofftechnik (LKT)
Universität Erlangen-Nürnberg

Information

Free keywords: fatigue behavior, composites, glass reinforced polymers, grp,fatigue life, hysteresis measurements, stiffness degradation
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. Helmuth Harig
Publication year: 1999
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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