【作者】 张巍； 易法军； 韩杰才； 张博明；

【Author】 Zhang Wei Yi Fajun Han Jiecai Zhang Boming (Center for Composite Materials, Harhin Institute of Technology, 150001)

【机构】 哈尔滨工业大学复合材料研究所；

【摘要】 利用扫描电镜(SEM)结合超高温拉伸试件断口的形貌分析,研究了细编穿刺碳/碳复合材料的组分微结构形态、内部微缺陷产生的原因以及随温度升高的演化规律,揭示了超高温条件下细编穿刺碳/碳复合材料的断裂机理:在温度和载荷的作用下,基体内的孔洞和微裂纹逐渐融合、扩展、长大,纤维/基体界面结合减弱、脱开,形成大的裂纹并沿着纤维/基体界面迅速扩展,使得材料的性能退化,最终在薄弱截面破坏。其中Z向强度主要受穿刺纤维束控制,XY向强度主要由碳布强度控制,其破坏主要是碳布层间的拉剪断裂。更多还原

【Abstract】 The present paper is roncerned with the evaluation of microstructure and interior defects of 3D fine weave pierced carbon/carbon composites and its fracture mechanism with increasing temperature by investigating SEM photographs of fracture of specimens under tensile load at ultra-high temperature. It is concluded that the porous and cracks merge and grow and the fiber/matrix interfaces degenerate under the combination of ultra-high temperature and load which cause the degradation of strength of materials and it would fracture from a weak section of composites. The strength of Z-direction of composites depends on the strength of pierced carbon fiber and a combination of tensile and bending stresses between the weave fabric reinforcements in XY direction.更多还原