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Fibre break failure processes in unidirectional composites. Part 3: Unidirectional plies included in laminates

Abstract : The purpose of these three papers is not to just revisit the modelling of unidirectional composites. It is to provide a robust framework based on physical processes that can be used to optimise the design and long term reliability of internally pressurised filament wound structures. The results given in paper Parts 1 and 2 concerning the behaviour of unidirectional composites, such as carbon fibre reinforced epoxy resin, are, here, extended to the behaviour of cross-plied composites consisting of unidirectional plies orientated at different angles with respect to the loading direction. In these laminates the plies orientated parallel to the loading direction (at 0∘) control the ultimate failure of the composite. This paper shows that the development of fibre breaks in analogous to that seen in the studies described in Part 1 and 2. Clustering of fibre breaks, shown by the development of 32-plets, preceedes failure just before specimen loaded monotonically break but develop in a more stable manner when subjected to steady high level loads. The effect of separating the 0∘ plies into thinner layers impedes the development of fibre breaks clusters and increases ultimate lifetimes.
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Submitted on : Tuesday, April 21, 2015 - 5:31:37 PM
Last modification on : Thursday, September 24, 2020 - 6:30:07 PM

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Alain Thionnet, H.Y. Chou, Anthony R. Bunsell. Fibre break failure processes in unidirectional composites. Part 3: Unidirectional plies included in laminates. Applied Composite Materials, Springer Verlag (Germany), 2015, 22, pp.157-169. ⟨10.1007/s10443-014-9399-y⟩. ⟨hal-01144508⟩

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