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Influence of curing parameters on the long-term behaviour of fibre reinforced composites

For the determination of the influence of processing conditions on the long-time behavior of high performance thermoset composites, four different laminate systems with varying degrees of cure were examined. The laminates were conditioned in both moist and dry environments, and characterized via thermoanalytical, mechanical and fracture mechanical investigations.

During the progression of moist conditioning, all of the systems exhibited a reduction in the measured glass transition temperature as a result of the plastification of the matrix. The complex interdependence between the degree of cure, moisture absorption and the resulting glass transition temperature can be described by a linear model for all of the investigated systems. Microscopic investigations have shown that the mechanical and fracture mechanical behavior of the carbon fiber reinforced laminates are predominately influenced by the fiber-matrix interphase. Therefore, the influence of both the processing conditions and climate on the properties of the interphase can be determined. For the glass fiber reinforced laminates, a direct correlation between the processing conditions and the long-time performance exists. The long-time mechanical behavior as a function of the processing and moisture absorption can be described by a linear model. Thus, the processor has access to a tool for the calculation of the mechanical and thermomechanical properties depending on the processing conditions and climate.

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Author
 Johannes Wolfrum

Johannes Wolfrum
Lehrstuhl für Kunststofftechnik (LKT)
Universität Erlangen-Nürnberg

Information

Free keywords: Epoxy resin, Carbon fibres, Degree of cure, Curing conditions, long-term behaviour, moisture, mechanical properties, thermo-mechanical properties
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. Manfred Neitzel
Publication year: 1999
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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