2D-C/SiC复合材料Ⅰ-Ⅱ复合型断裂性能  

Ⅰ-ⅡMIXED⁃MODE FRACTURE PROPERTY OF 2D⁃C/SIC COMPOSITES

作　　者：林江嵘 杨成鹏[1] 戚云超 LIN JiangRong;YANG ChengPeng;QI YunChao(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi′an 710072,China;Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150080,China)

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072 [2]哈尔滨工业大学特种环境复合材料技术国家级重点实验室,哈尔滨150080

出　　处：《机械强度》2023年第3期576-583,共8页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(12072274)资助。

摘　　要：为了表征2D-C/SiC复合材料的Ⅰ-Ⅱ复合型断裂性能,采用了含单边裂纹Arcan蝶形试样,通过有限元模型分别对试样的Ⅰ型和Ⅱ型断裂形状因子进行了标定。应用Arcan圆盘装置对2D-C/SiC蝶形试样开展了Ⅰ型、Ⅱ型和Ⅰ-Ⅱ复合型断裂试验,研究了试样在不同加载路径下的宏-细观断裂模式和强度性能。结果表明,2D-C/SiC复合材料Ⅱ型断裂韧度比Ⅰ型高;随着偏轴加载角度的增大,裂纹扩展路径受剪应力的影响变得显著,且试样的抗断性能有增强趋势。对几种断裂判据的适用性进行了论证,给出了2D-C/SiC复合材料的Ⅰ-Ⅱ复合型断裂表征模型。Ⅰn order to characterize theⅠ-Ⅱmixed⁃mode fracture performance of 2D⁃C/SiC composites,Arcan butterfly specimens with unilateral cracks were used,and the mode⁃Ⅰand mode⁃Ⅱfracture shape factors of the specimen were calibrated through finite element model.The Arcan disc device was used to carry out mode⁃Ⅰ,mode⁃ⅡandⅠ-Ⅱmixed⁃mode fracture tests upon 2D⁃C/SiC butterfly specimens,and the macroscopic and microscopic fracture modes and strength properties of the specimens under different loading paths were investigated.The results show that the fracture toughness of mode⁃Ⅱof 2D⁃C/SiC material is higher than that of mode⁃Ⅰ.With increasing of the loading angle,the influence of shear stress on the crack propagation path increases,and meanwhile the fracture resistance of the specimens presents a tendency to increase.The applicability of several fracture criteria is demonstrated,and anⅠ-Ⅱmixed⁃mode fracture criterion for 2D⁃C/SiC composites is suggested.

关 键 词：陶瓷基复合材料 复合型断裂 有限元模型 应力强度因子 断裂准则 

分 类 号：TB332[一般工业技术—材料科学与工程] O34[理学—固体力学]