抄録
Relationships between shear behavior and fiber bundle inter facial properties of three-dimensionally reinforced carbon/carbon composites (3D-C/Cs) were examined from room temperature to elevated temperatures. The 3D-C/Cs exhibited a significant shear non-linearity and shear strength increased monotonically with increasing test temperature, T. According to damage observation results, the shear non-linearity was found to be attributed to the debonding and sliding at fiber bundle interfaces. This result indicates that shear behavior of the 3D-C/C is highly related to damage at fiber bundle interfaces. To clarify the mechanisms yielding the shear strength improvement at elevated temperatures, fiber bundle pushout tests were conducted up to 2273K. Similarly to shear strength, fiber bundle interfacial strength τ^i_<max> increased with increasing T.
