Controlled matrix contraction composites

Details Controlled matrix contraction composites Controlled matrix contraction composites

B - Operations, Transporting

29

C

18/955

B29C 70/06 (2006.01) B29C 70/04 (2006.01)

Patent

CA 1176812

ABSTRACT There is provided a method of increasing the toughness of a fibre-reinforced composite material. The fibre and matrix material are so selected that, upon development in the matrix of a crack bridged by a fibre, the grip of the matrix on the fibre due to matrix shrinkage will be small enough to allow the fibre, while stretching, to progressively shrink away from the matrix beginning at the crack, but large enough to cause the fibre to break when the progressive fibre shrinkage reaches a major flaw in the fibre. This is effectively accomplished by making the fibre Poisson's shrinkage at breaking stress substantially the same as the matrix contraction strain. The latter can be adjusted by mixing with the basic matrix material a selected quantity of an additional substance, such as spiro polymer or an inert particulate material.

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