三维机织复合材料结构表征与实体造型

Architecture description and solid modeling of 3D woven composite

利用经纱脉络描述法解决了任意三维机织复合材料的结构表征问题;提出了单胞分解法与亚胞向量概念,实现了三维结构的二维化、数字化,根据数字表征结果和经典截面假设构造了初始断裂模型;使用一种迭代算法对初始断裂模型进行优化,使纱线束逐步逼近真实形态,进而实现三维实体造型,在此基础上进行网格剖分。研究结果表明,迭代算法能够使纱线形态趋于自然,使造型结果接近实际。数值分析结果表明,迭代算法中的经纬纱退让系数介于0.6~0.7之间时,迭代收敛速度最快。

A warp skeleton method was proposed to solve the descriptive issue of arbitrary 3D woven composite architecture, with the unit cell being decomposed into subcells/grids. The subcell vector concept was introduced to digitalize the 3D architecture, in order to use the 2D database table to store it. An initial rupture model was built by the digitalized data and the classical cross-section hypothesis, an iterative algorithm was used to optimize the model, amied at approaching the real world model, and thus the 3D solid model and mesh generation were completed. The results show that the iterative method can naturalize the tow pattern, with the model approaching the physical composite. The numeric analysis results show that the rate of astringency of the iterative algorithm is optimized when the proportion for moving warp and weft was situated between 0.6-0.7.