Study of dynamic compressive behaviors of 2D C/SiC composites at elevated temperatures based on in-situ observation

Dynamic and quasi-static compressive behaviors of 2D C/SiC composites were examined from room temperature to 1600 degrees C based on in-situ observation, under the environment of air and argon. Tests were conducted respectively on a high temperature universal test machine and an improved high temperature split Hopkinson pressure bar. The improvement of the interface strength and the nucleation of multiple cracks influence the compressive strength under dynamic conditions. As the influence of thermal residual stress, the failure angles and compressive strength of the specimen increased with the increase of temperature in the argon environment. Owing to the competition between oxidation and thermal residual stress, the compressive strength of the specimen increased slightly with increasing temperature, and then dropped sharply for temperature above 700 degrees C in air. The strain rate sensitivity factor of 2D C/SiC composites increased significantly as the temperature increased in the air environment, but decreased in the argon environment.