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Fibre-reinforced laminates with a gradient in resin matrix

: Uhlig, C.; Fliedner-Dimke, E.; Goering, H.; Bauer, J.; Bauer, M.; Queck, H.; Frenzel, H.

Kaysser W.A.:
Functionally Graded Materials 1998. Proceedings of the 5th International Symposium on Functionally Graded Materials : Held in New Town Hall, Dresden, Germany, October 26 - 29, 1998
Uetikon-Zürich: Trans Tech Publications, 1999 (Materials science forum 308/311)
ISBN: 0-87849-833-8
International Symposium on Functionally Graded Materials <5, 1998, Dresden>
Conference Paper
Fraunhofer IZM, Einrichtung Polymermaterialien und Composite ( PYCO) ()

Using the hot press laminating technique gradient laminates have been realised with a cyanate ester matrix resin modified by a carboxyl terminated liquid rubber of graded amount in the direction normal to the fibre. It is shown, that the structure of the gradient after the hot press laminating process can be analysed using Dynamic Mechanical Analysis (DMA ). There is a distinct influence of such gradients on the laminate damage tolerance. So far only gradient laminates with a non-symmetric distribution have been realised (one-sided gradient laminate), however, the optimum gradient design for a maximum damage tolerance seems to be the double-sided gradient laminate.