针刺预制体纤维排布对C/C复合材料力学性能影响  

Influence of fiber arrangement of needled preform on mechanical properties of C/C composite

作　　者：王毅[1] 郑金煌[1] 崔红[1] 邓海亮[1] 

机构地区：[1]西安航天复合材料研究所,西安710025

出　　处：《固体火箭技术》2016年第3期388-391,396,共5页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(51202233)

摘　　要：制备纤维([0°/90°],[-45°/+45°],[0°/90°/-45°/+45°]和[0°,0°/90°,90°])排布的4种针刺预制体以制备C/C复合材料,研究了纤维排布方式对C/C复合材料拉伸、弯曲性能的影响,并借助SEM观察了材料的断裂形貌。研究表明,[0°/90°/-45°/+45°]排布方式C/C复合材料综合性能表现良好,具有较好韧性;纤维排布方向与拉应力夹角不同时,材料断裂形式存在明显差异,即0°方向纤维表现为整丝束断裂拔出,丝束内部纤维拔出长度较短,呈现脆性断裂特征;90°纤维周围碳基体呈现拉应力撕裂,纤维断裂较少;±45°纤维拔出较长,表现出假塑性断裂特征。Influence of different arrangement such as [ 0°/90° ], [ - 45°/＋ 45° ], [ 0°/90°/- 45°/＋ 45° ] and [ 0°, 0°/90°, 90° ] on tensile properties and flexural strength of composites was studied, and the patterns of fracture were studied by means of SEM. The results show that the comprehensive performance of C/C composite with [ 0°/90°/-45°/＋45°] arrangement is excellent, and the crack extends as the ＂Z＂ which is ductile fracture; Inside the needling C/C composites, due to the difference of angle be- tween the direction of fiber arrangement and the force direction, there are differences in the fiber failure modes ： the tows of 0° fibers are pulled out in a whole when breaking, meanwhile inside the tows, the pull-out length of fibers is shorter, which exhibits brittle fracture feature. The carbon matrix around the 90° fibers is torn by tensile stress, and fiber breakage is less. The pull-out length of±45° fibers is longer,which exhibits ductile fracture characteristics.

关 键 词：排布方式 拉伸强度 弯曲强度 断裂机制 

分 类 号：V254[一般工业技术—材料科学与工程]