衝撃荷重下におけるカーボン長繊維強化型窒化ケイ素の圧縮強度

抄録

The compressive strength of continuous carbon fiber-reinforced silicon nitride ceramics was investigated experimentally at low and high rates of strain. The orientation dependence of the strength and fracture characteristics was well rationalized in terms of shear deformation pararell and/or perpendicular to the fiber direction. A significant effect of deformation rate on the strength was clarified in the case of shearing delamination, while there was no effect on the strength in the case of splitting fracture. The specimen loaded along the fiber direction was fractured by splitting at the stress well below the tensile fracture stress. Microstructural inhomogenity and microcracks induced during the fabrication process play an important role on the strength and fracture morphology of the material.