平纹机织多元多层碳化硅陶瓷基复合材料的等效弹性模量预测

Prediction of Effective Elastic Modulus of Plain Weave Multi-phase and Multi-layer Silicon Carbide Ceramic Matrix Composite

针对平纹机织多元多层碳化硅陶瓷基复合材料,按照"从底向上"的顺序考虑了纤维丝/界面/基体尺度以及纤维束/基体/涂层尺度下的微结构有限元模型。采用能量法依次进行了两个尺度上的等效性能计算,首先在纤维丝/界面/基体的尺度上计算了纤维束的等效弹性参数,然后将这些参数代入到纤维束/基体/涂层尺度微结构模型中,计算得到复合材料的整体弹性常数。数值计算结果与实验结果吻合较好,验证了所提计算方法以及模型的有效性。

The bottom-up multi-scale finite element modeling based on the sequential consideration of the fiber/ interface/matrix scale and the tow/matrix/coat scale is employed to study the plain weave multi-phase and multi-layer silicon carbide ceramic matrix composite. The strain energy-based method is adopted for the multi-scale analysis and evaluation of effective properties. First, the effective properties of tows are computed on the fiber/interface/matrix scale. Then these properties are incorporated into the microstructure on the tow/matrix/coat scale and the effective properties of the composite are obtained. Numerical results obtained by the proposed method and model are shown to agree well with the results measured experimentally.