基于微胞体划分的三维编织复合材料有效力学性能分析

Analysis on Effective Mechanical Properties of 3D Braided Composites Based on Micro Cell

对三维编织复合材料的编织工艺和材料细观结构进行了深入的分析,提出一种微胞体划分技术,细观结构复杂的单胞体被划分为两类结构简单的微胞体有规则的集合;对每类微胞体分别求出其各自的等效弹性性能,不同的微胞体在有限元分析中被认为是不同的均质材料,建立了基于微胞体划分技术下的三维有限元分析方法;对三维四步1×1矩形编织复合材料的有效力学性能进行了预测,结果与实验吻合较好。

On the basis of braided procedure, yarn moving tracks and analysis of microstructure of 3D braided composites, a new method of dividing micro cell to calculate effective mechanical properties is suggested. The unit cell is formed regularly by two kinds of micro cell whose microstructures are very simple. The effective elastic properties of micro cell are calculated. Each different micro cell is regarded as homogeneous solid. Based on the method, the finite element method is established. The effective mechanical properties of four step 1 × 1 rectangle 3D braided composites are predicted. A comparison between theoretical and experimental results shows that this method can reasonably predict effective mechanical properties of 3D braided composites.