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中文摘要：
根据矩形编织体4步编织法的纱线运动规律，提出了利于图形建模的纱线单胞模型。用SolidWorks软件的API接口及Visual C^＋＋语言，编制了自动生成编织体的软件，该软件能模拟不同编织参数下的矩形三维编织整体结构。本文对编织角为22°，33°；纤维体积百分数为40％，30％；主体纱为2×2，2×4，4×4，4×6的编织结构进行了模拟，其结果与实际编织体的照片基本一致，说明此模拟是有效的。解决了编织预制体内部分析困难的问题，为使用有限元分析三维编织复合材料的力学性能奠定了基础。
英文摘要：
It is well known that the structure of preform is one of key factors for mechanical performance of three dimension braided composite. In this paper, according to the yarn＇s regulation of four-step braiding pattern, a yarn unit model is presented which is of benefit to computer graphic modeling. At the same time, using Visual C^＋＋ and SolidWorks API, the software is programmed which can automatically generate the integral geometric structure of three-dimension braided performs. As a result, inputting different braided parameters, such as braided angle, fraction volume of fiber, yarn radius and different number of rows and columns, the software can automatically generate the braided entity. The three-dimension braided preforms with braided angle 22°, 33°; fraction volume of fiber 40% , 30% ; number of rows and columns 2 × 2, 2× 4, 4×4, 4× 6 are simulated. The simulated results are well in correspondence with the practical preforms. It helps to investigate the microstructure in three-dimension braided preforms. And then, it is the foundation to establish the mechanical model for finite element analysis.
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