Quasi-static and Dynamic Compressive Fracture Behavior of SiC_f/SiC Composites

To understand the quasi-static and dynamic compressive mechanical behavior of twodimensional SiC fiber-reinforced SiC composites(2D-SiCf/Si C), their compressive behavior at room temperature was investigated at a strain rate from 10-4 to 104 /s, and the fracture surfaces and damage morphology were observed. The results show that the dynamic failure strength of 2D-Si Cf/Si C obeys the Weibull distribution, and the Weibull modulus is 5.66. Meanwhile, 2D-SiCf/SiC presents a transition from brittle to tough with a decrease of strain rate, and 2D-Si Cf/SiC has a more signifi cant strain rate sensitivity compared to the 2D-C/SiC composites. The failure mode of 2D-Si Cf/SiC depends upon the strain rate.