三维C/C复合材料的压缩性能及破坏机制

采用扫描电镜、激光共聚焦显微镜观察和力学性能测定的方法，研究了三维C/C复合材料微观结构形貌，以及材料x向、y向和z 向的压缩性能。结果表明，材料内部缺陷明显，纤维束/基体界面结合较弱，材料z向压缩强度和破坏应变均大于x向和y向，压缩应力-应变曲线开始阶段近似线性，随着载荷的增加，曲线表现出明显的非线性特征。从宏观上考察了材料的压缩破坏机制，材料x向、y向和z向破坏模式均为剪切型破坏，纤维/基体界面结合强度对破坏模式影响明显。

Compressive properties and failure mechanism of 3D C/C composites

By means of scanning electronic microscope(SEM),laser scanning confocal microscope(LSCM) and mechanical properties measuring,the microstructure morphology and the compressive mechanical properties of the 3D C/C composite along x,y and z directions were studied.The results show that there are obvious defects,and there is weak adhesion in the fiber/matrix interface of the 3D C/C composite.The compressive strength and fracture strain along z direction are all much greater than those along x direction and y dir...