Statistical distribution of tensile strength of a 2D-SiC_f/SiC composite

2D-SiC_f/SiC composite is an important thermostructural material in aeronautics and astronautics fields. The statistical distributions of the tensile strength play a critical role in design, manufacture, examination and verification of the 2D-SiC_f/SiC composite and the related components made of the composite. Therefore, the tensile strength of the 2D-SiC_f/SiC was measured at room temperature (RT) and 1 200℃. SEM was employed to observe the fracture morphology. The result of the tensile strength was analyzed by Weibull, normal and lognormal distribution statistics and verified by Anderson-Darling method. The result shows the tensile strength at RT and 1 200℃ of 2D-SiC_f/SiC can be better described by Weibull distribution than normal distribution and lognormal distribution. The tensile strength at 1 200℃ scatters is at larger range than that at RT according to Weibull model. The average tensile strength can be accurately predicted by the Weibull distribution. The fracture morphology confirms that distribution of the tensile strength of the 2D-SiC_f/SiC is mainly caused by the fiber/matrix interfacial bonding strength and the fiber strength.