Abstract
Interconnected fibre networks presenting transverse isotropic symmetry with variable fibre interconnectivity were prepared by sintering assemblies of low carbon steel fibres. The strength and stiffness of these fibre preforms was found to increase very much when increasing sintering temperature or sintering time. Squeeze cast composites were prepared by infiltrating these preforms with alloy ZA8. Creep tests and tensile tests were carried out at 150°C. Both the creep strength and the back-flow strains at unloading drastically increase with increasing preform sintering temperature or time. Also thermal expansion is much affected by fibre interconnectivity. Especially, during cooling, the matrix dilatation strains brought about by thermal mismatches increase with increasing fibre interconnectivity. These results demonstrate that plastic and viscoplastic behaviours of network reinforced composites depend on the mechanical properties of the network as a whole.
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