初始缺陷对平纹编织C/SiC复合材料热膨胀系数的影响  

Effect of the Initial Defects on the Thermal Expansion Coefficients of Plain Weave C/SiC Composite

作　　者：姚磊江[1] 王梦[1,2] 陈刘定[1,2] 童小燕[1] 

机构地区：[1]西北工业大学无人机特种技术重点实验室,西安710065 [2]西北工业大学航空学院,西安710072

出　　处：《机械科学与技术》2015年第2期311-314,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(11072195)资助

摘　　要：基于有限元细观计算力学(FECM)提出了一种获得平纹编织C/Si C复合材料的初始缺陷对其热膨胀系数影响关系的方法。首先通过扫描电镜(SEM)观察将初始缺陷进行分类并利用SEM图对各类初始缺陷的分布特征进行测量和统计,然后依据测量和统计结果建立含初始缺陷的宏观材料代表体积单元(RVE)和纤维束RVE有限元模型,最后采用FECM方法预测含各类初始缺陷宏观材料RVE的热膨胀系数。基于以上方法得到了各类初始缺陷与宏观材料热膨胀系数之间的定量映射关系。An approach to obtain the effect of the initial defects on the thermal expansion coefficients of plain weave C / Si C composite was proposed based on the finite element computational micromechanics( FECM). Firstly,the initial defects were classified by using SEM observations and furthermore the measurements and statistics were carried out according to the SEM images. Then,the entire composite and fiber bundle representative volume element( RVE) models with initial defects were established according to the above-mentioned results. Finally,the thermal expansion coefficients of entire composite RVE models with initial defects were predicted by using the FECM method. The quantitative mapping relationships between all kinds of initial defects and the thermal expansion coefficients of entire composite were obtained based on the above-mentioned method.

关 键 词：C/SIC复合材料 初始缺陷 热膨胀系数 有限元细观计算力学 扫描电镜 

分 类 号：TB332[一般工业技术—材料科学与工程] V250[航空宇航科学与技术—航空宇航制造工程]