High temperature compression properties and failure mechanism of 3D needle-punched carbon/carbon composites

This paper reports the high temperature compression properties and failure mechanism of 3D needle-punched C/C composites. The results show that the stress-strain curves show non-linear and plasticity failure feature after 600 °C. The compression properties decrease significantly with increasing the temperature due to material oxidation. The composite exhibits shear fracture at the angle of 45°. The major damage patterns are the tearing of 90° oriented fibers and shear failure of 0° oriented fibers on the shear surface. After 600 °C, the local and plastic failure feature becomes more obvious. The composite is oxidized obviously and fiber/matrix interfacial adhesion is decreased significantly.