Determination of dynamic stress intensity factor of C/C-SiC composites

Abstract
This paper presents a split Hopkinson pressure bar (SHPB) technique to determine the stress intensity factor of unoxidised and oxidised (1600 °C for 15 min) carbon-carbon silicon carbide (C/C-SiC) composites with the chevron notched pre-crack length. Only the Split Hopkinson input bar was used. The pressure pulse was used to load a pre-cracked specimen with the reflected tensile pulse from the end of the specimen. The length ofthe specimen was chosen in such a way that the pressure and tension pulse were separated. After the interprétation of the experimental data's, the dynamic stress intensity factor of each samples were measured. The results show that the dynamic stress intensity factor was affected by the conditioning of C/C-SiC composite specimens. The SEM micrographs were verified the effect of load and conditioning on morphology of C/C-SiC composite materials.