To model 3-Dimensional woven composites, the width and thickness of the yarn are generally used as input parameters. However, since these parameters can only be obtained after the composites are molded, it is not efficient in the initial stages of design using woven composites. Therefore, a geometric modeling method using weaving parameters that can be known before manufacturing is required. In this paper, geometric parameters such as thickness and width of each yarn are calculated using weaving parameters. From the obtained parameters, the cross section and path of the yarns and the unit cell are modeled. The method is validated by comparing the calculated geometric parameters and fiber volume fraction with direct measurements of the overall composite. Moreover, the unit cell is applied to an analytical method based on the iso-strain and iso-stress assumptions to evaluate the stiffness in the longitudinal and transverse directions. The mechanical properties are compared and verified with the specimen test results. We conclude that the present method is useful for the design of aerospace structures to which the 3-dimensional composite is applied.

为了模拟三维机织复合材料，通常将纱线的宽度和厚度用作输入参数。但是，由于只能在复合材料成型后才能获得这些参数，因此在使用编织复合材料进行设计的初始阶段效率不高。因此，需要在制造之前已知的使用编织参数的几何建模方法。在本文中，使用编织参数计算几何参数，例如每根纱线的粗细和宽度。根据获得的参数，对纱线和单位单元的横截面和路径进行建模。通过将计算出的几何参数和纤维体积分数与整个复合材料的直接测量值进行比较，验证了该方法的有效性。而且，将单元格应用于基于等应变和等应力假设的分析方法，以评估纵向和横向的刚度。将机械性能与样品测试结果进行比较和验证。我们得出的结论是，本方法对于3维复合材料应用到的航空航天结构的设计很有用。