Consideration of kinking in the laminate design process

Prof. Dr.-Ing. Dr.-Ing. E.h. Walter Michaeli,
Dipl.-Ing. Fabian Preller, Dipl.-Ing. (FH) Alexander Krafzick Institut für Kunststoffverarbeitung (IKV), RWTH Aachen

Many investigations on endless fibre reinforced plastics have shown that fibre parallel compression evokes different failure mechanisms. The micromechanical background of these failure mechanisms and therefore the according influencing factors are already well analysed. For a better laminate design two physically based models concerning the failure mechanism "kinking" on the one hand and "the non-linear stress-strain relations" on the other hand were combined and integrated in the calculation procedure of the common laminate design process.


Assembly injection molding of piezo-active sandwich structures

Prof. Dr.-Ing. Dietmar Drummer, Dipl.-Ing. Jörg Vittinghoff, Dr.-Ing. Gerrit Hülder Lehrstuhl für Kunststofftechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg

Meanwhile, for the production of complex, multi-material composites the assembly injection molding has established in direct process as well as in insert process. A further step to smart parts is the integration of piezo-electric modules in fiber-reinforced sandwich composites via assembly injection molding. The aim is the ability to detect fatigue of thermoplastic structure parts early or to reduce component vibration in an active way. In the present paper the production technique, the questions about the compatibility of different materials as well as the simulation of the production technique and the material behavior are introduced.

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