Abstract
Finite element analysis has been applied to selectively SiC fibre reinforced titanium matrix composites. The influence of thermal residual stress on the behaviour of clad titanium fibre composites with initial unbridged sharp cracks under external loading has been investigated. Through-thickness stress distributions have been obtained for the composites as a function of loading configuration, fibre volume fraction, cladding thickness and composite thickness. It has enabled a quantitative understanding of the premature delamination of clad titanium fibre composites ahead of mode I crack that has been observed experimentally. Potential solutions to the problem have been suggested based on finite element predictions of the variation of tensile through-thickness stress close to the transition boundary between cladding material and composite as a function of fibre volume fraction and, especially, with thickness of the cladding layers.
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