Dynamic compressive properties of 2D C/SiC composites' Z direction in low temperature

The tests for dynamic compressive properties of 2D-C/SiC composites' Z -direction were performed in low temperature circumstance by using the SHPB system.The low temperature was made by controlling the ratio of coefficients between alcohol and liquid nitrogen to be obtained.The key issue to apply high strain rates to the 2D-C/SiC was to design the geometrical size of the shaper in the SHPB system.The test results of the dynamic loading were successful.Results indicate that 2D-C/SiC composite material show pseudo-plastic behavior at dynamic loading conditions in low temperature circumstance owing to a lot of internal microcracks in the initial composite material, so it does not exhibit typical brittle failure when the composites were destroyed, but it shows the strain softening phenomenon significantly when the stress reaches the compressive strength of the composites, and the specimens have experienced a large deformation before destruction.As the temperature decreases, the dynamic compressive strength of composites' Z -direction increases, but the failure strain decreases.At low temperatures, the interface between the internal fiber and matrix in the 2D-C/SiC composites enhances the binding force of the interface, and the more strength interfacial force can lead to a more strength high compression.