.2d-c/sic Composite Elastic Constant Prediction And Failure Mode Studies

2D-C/SiC composite is a new kind of high temperature structure materials with technology progress in aviation and spaceflight field. On the one hand, it overcomes the brittle nature of singular ceramic and elevates toughness; on the other hand, it keeps the advantages of ceramic matrix materials such as good heat-resistant-, low expansion, low density, well capability of heat stabilization, etc. 2D-C/SiC composite has become prospective materials. Thus, it is necessary to research mechanical performance of 2D-C/SiC composite.By taking account of the affect of fiber undulation and voids, a new cell model was built to calculate the longitudinal elastic modulus of 2D-C/SiC composite, which based on the microstructure and specific CV1 preparation of CMCs. The influence of some factors, including the matrix modulus, fiber modulus and volume fraction of fiber, on the longitudinal elastic modulus of 2-D braided CMCs was analyzed. The result agree well with experiments. Many experiments on 2D-C/SiC composite was conducted, including tension, compression shear, etc, the particular experimental process was discussed in the paper. The toughness and failure mechanism were presented. The micro-mechanical behaviors were investigated by combining loading/unloading stress-strain curves and SEM photos; failure mode and damage mechanism were also analyzed by SEM photos and optical microscope.