Abstract

Various fibre damage may occur during 3D orthogonal SiC woven weaving, leading to the variability of sub-regional fibre strength. In this study, different types of yarns were divided into several subregions along the cross-section according to the possible damage modes. The fibres in different subregions were extracted, and the monofilament strength test was carried out. The results showed that the fibre strengths of yarns and yarn subregions followed normal distributions. The correlation between the fibre strength distribution of the in-situ yarns and the subregion fibre strength difference was verified by using the Monte Carlo simulation method. Finally, the sub-regional fibre strength difference was considered in the tensile simulation of 3D orthogonal woven SiC/SiC composites. The simulation results agree with the experimental results and showed that the variability of sub-regional fibre strength significantly affects the composite's constitutive behaviour.

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