Layer-directional dynamic compressive mechanical properties of two kinds of densifications 2D-C/SiC

The tests for dynamic compressive mechanical properties of two kinds of densifications 2D-C/SiC were performed by using the SHPB system. The materials are made by controlling the parameters of CVI technics. The key issue to apply high strain rates to the 2D-C/SiC is to design the geometrical size of the shaper in the SHPB system. The experimental results of both the dynamic and static loading are successful. They show that the dynamic compressive stress-strain curve is distinctly non-linear. The mechanical properties of the two densifications 2D-C/SiC are both strengthened under high strain rates, which are the higher failure strength, the lower failure strain and the larger shearing damage angle. The higher densification leads to the higher failure strength, lower failure strain and larger shearing damage angle. The dispersive dynamic experimental data are described by Weibull modules, which are 8.36 and 5.27 respectively for high and low densifications. From the SEM, a smooth ruptured surface is found for the high densification. More cracked fibers are observed under high strain rates.