一、序言 纤维增强复合材料,无论是单向纤维增强、角度层增强、甚至乱纤维增强的复合材料,一般说来都是各向异性的,尤其表现在强度领域里更为突出。三向增强碳/碳材料,虽然三个方向上都有纤维的增强作用,但由于在各个不同方向上选用的增强纤维数目不同,三个正交方向上的性能也不完全一样,而其它任一方向的性能相差更悬殊。 研究三向增强碳/碳材料在各不同取向下的断裂特征,对于正确设计、合理使用这 I. INTRODUCTION Fiber-reinforced composite materials, whether unidirectional fiber reinforced, angle layer reinforced or even fiber reinforced composite materials, are generally anisotropic, especially in the field of strength which is more prominent. Three-direction enhanced carbon / carbon materials, although fiber reinforced in all three directions, have different properties in the three orthogonal directions due to the different number of reinforcing fibers used in each direction, while the others Differences in the performance of a more disproportionate direction. Research on the three-way enhanced carbon / carbon material fracture characteristics under different orientations, for the correct design, rational use of this