疲劳损伤对3D C/SiC复合材料裂纹分布的影响  

Effect of Fatigue Damage on Distribution of Cracks in 3D C/SiC Composites

作　　者：张钧[1,2] 栾新刚[1] 张立同[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072 [2]西安石油大学材料科学与工程学院,西安710065

出　　处：《航空材料学报》2009年第5期94-98,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金(No.90716023)资助项目

摘　　要：采用χ2拟合优度检验方法对疲劳试验前后3D C/SiC复合材料基体和涂层裂纹分布规律进行研究。结果表明,原始试样中3D C/SiC复合材料基体和涂层裂纹间距分别服从分布函数为N(143.75,56.782)和N(562.59,100.092)的正态分布,疲劳后基体和涂层裂纹间距分别服从分布函数为N(105.48,29.162)和N(227.89,25.232)的正态分布。疲劳可以促使新裂纹的产生,但不能改变基体和涂层裂纹间距分布的基本特征,这是由3DC/SiC复合材料的编织结构所决定的。Χ^2 goodness-of-fit test was introduced to investigate the distribution of the cracks on the matrix and the coating of 3D C/SiC composites before and after fatigue testing. The results show that the crack spacing of the matrix and the coating in the as-received composites obey the normal distribution N （ 143.75, 56.78^2 ） and N （ 562.59, 100.09^2 ） , respectively. After fatigue testing, the crack spacing of the matrix and the coating obey the normal distribution N（ 105.48, 29.16^2 ） and N（227.89, 25.23^2） ） , respectively. The distribution regularities are determined by the three dimensional braided structure of the composites. More cracks are brought in the matrix and the coating due to the fatigue stress, but the character of normal distribution is unchanged.

关 键 词：C/SIC复合材料 疲劳 裂纹 

分 类 号：TB332[一般工业技术—材料科学与工程]