Matrix failure mechanism and strength prediction of UD-C/SiC ceramic matrix composites
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摘要: 采用细观力学方法对单向C/SiC陶瓷基复合材料的基体失效机制进行了研究。利用剪滞理论模型和临界基体应变能(CMSE)准则预测了C/SiC陶瓷基复合材料受拉时基体开裂失效过程, 获得了单向C/SiC陶瓷基复合材料基体开裂段的应力-应变曲线。并将扩展有限元法(XFEM)用于该开裂过程的模拟, 得到了对应的应力-应变曲线。研究结果表明, 采用剪滞理论模型、CMSE和采用XFEM得到的计算结果与相关的实验结果三者能较好地吻合, 证明了计算方法的有效性。Abstract: The method of micromechanics was used to study the matrix failure mechanism of UD-C/SiC ceramic matrix composites (CMCs). Shear-lag theory model and critical matrix strain energy (CMSE) were employed to forecast the tensile process, and the stress-strain curves of UD-C/SiC CMCs matrix cracking and failure were obtained. Extended finite element method (XFEM) was also utilized to simulate this process and the relative stress-strain curves were obtained. It is indicated that the calculation results of the two different methods are in accordance with that of the experiment. And it is proved that both of the two methods are valuable to forecast the matrix failure property of the UD-C/SiC CMCs.
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