2.5维机织复合材料细观几何模型及刚度预测方法研究进展

本文从2.5维机织复合材料细观几何结构出发，讨论了织造及成型工艺对材料实际细观几何结构的影响，并分析了不同纱线截面及路径假设所建立代表性体积胞的优缺点。对考虑工艺因素的代表性体积胞是否具有统一性和体素单元法建模的合理性做出对比分析。在代表性体积胞的基础上，重点讨论了2.5维机织复合材料刚度的数值预测方法，并将其与刚度的理论预测方法作了简单对比。基于刚度的数值预测方法，分析了各种机织参数对刚度系数的影响，并且对比了不同代表性体积胞模型的应力场。此外，还讨论了2.5维机织复合材料叶片的建模分析技术与刚度设计方法。最后，指出了当前2.5维机织复合材料细观建模及刚度预测方法存在的问题与不足，并且对其力学性能研究的发展趋势进行了展望。

Research Progress on Meso-Geometric Models and Stiffness Prediction Methods of 2.5D Woven Composites

In this paper, the effects of weaving and molding processes on the actual meso-geometry of the material are discussed in terms of the meso-geometry of 2.5D woven composites, and the advantages/disadvantages of representative volume cells established by different assumptions of yarn cross-section and path are analyzed. A comparative analysis is made on whether the representative volume cells considering process factors are uniform and the rationality of the voxel cell method of modeling. Based on the representative volume cells, the numerical prediction method of the stiffness of 2.5D woven composites is focused on and is briefly compared with the theoretical prediction method. Based on the numerical prediction method of stiffness, the effects of various weaving parameters on the stiffness coefficients are analyzed, and the stress fields of different representative volume cell models are compared. In addition, the modeling analysis techniques and stiffness design methods for 2.5D woven composite blades are discussed. Finally, the problems and shortcomings of the current meso-scale modeling and stiffness prediction methods for 2.5D woven composites are pointed out, and the development trend of their mechanical properties is prospected.