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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。
The structure characterization of any three-dimensional woven composite material is solved by the description of warp and veins. The concept of single cell decomposition and subcell vector is proposed to realize the two-dimensional and digitalization of three-dimensional structure. Based on the results of numerical characterization and the assumption of classical cross-section The initial fracture model was optimized. An initial iteration algorithm was used to optimize the initial fracture model to make the yarn beam gradually approximate the true shape, and then realized the 3D solid modeling. Based on this, the meshing was performed. The results show that the iterative algorithm can make the shape of yarn tend to be natural, so that the modeling results are close to reality. The numerical results show that the iterative algorithm converges fastest when the warp / weft yarn concession coefficient is between 0.6 and 0.7.