SiC纤维增强复合材料基体裂纹偏移机理的有限元分析  

Finite element analysis of matrix crack deflection mechanisms in fiber-reinforced composites

作　　者：刘鹏飞[1] 王双连[1] 陶伟明[1] 郭乙木[1] 

机构地区：[1]浙江大学工程力学系

出　　处：《复合材料学报》2006年第3期146-152,共7页Acta Materiae Compositae Sinica

基　　金：浙江省自然科学基金资助项目(M503095);浙江省教育厅科研项目

摘　　要：运用基于能量的裂纹偏移准则,分别建立了两相和三相复合材料基体裂纹偏移/穿透的轴对称有限元模型,考察了纤维体积分数、描述材料特性弹性失配的Dundurs参数α和相对裂纹扩展长度ad/ap对相对能量释放率Gd/Gp的影响。将两相复合材料的有限元结果与He等人的结果进行对比,进一步考察了三相复合材料界面层厚度和Dundurs参数α1和α2对Gd/Gp的影响。分别将碳涂层SiC纤维增强复合材料SiC/C/Ti-6A1-4V和碳涂层陶瓷基增强复合材料SiC/C/SiC运用于有限元分析中,结果表明,所建立的模型能够准确地预测和比较基体裂纹偏移的机理。The axisymmetric finite element models of the matrix crack deflection/penetration for two-phase and three-phase composites were established respectively by applying the energy-based crack deflection criterion. The effects of the fiber volume fraction, the Dundurs parameter a describing the elastic mismatch between material properties, and the relative crack growth length αd/αp on the relative energy release rate ratio Gd/Gp were investigated. The FEA results were compared with those obtained by He for two-phase composites, and the effects of the interphase thickness, Dundurs parameters α1 and α2 on Gd/Gp were further studied for three-phase composites. The SiC fiber-reinforced composite SiC/C/Ti-6Al-4V and ceramic composite SiC/C/SiC coated with cabon were analyzed by the FEA respectively, and the results show that the models can accurately predict and compare the matrix crack deflection mechanisms.

关 键 词：裂纹偏移/穿透 界面/界面层 能量释放率 有限元法 SiC纤维增强复合材料 

分 类 号：TG332[金属学及工艺—金属压力加工]