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分别通过实验与控制体积方法系统地研究了采用四步法 1× 1方型编织工艺编织的预成形件的纱线结构。提出了纱线椭圆形横截面假设 ,考虑了编织纱线的细度和编织纱线填充因子的影响。根据编织过程中携纱器的运动轨迹特点 ,将预成形件划分为内部、表面和棱角 3个不同的区域 ,分别定义了不同的控制体积单元 ,识别了预成形件的两种局部单胞模型 ,分析了预成形件的纱线构造 ,并导出了编织结构参数之间的关系。为编织复合材料的刚度、强度性能分析提供了充分的条件。
The yarn structure of the preform weaved by the four-step 1 × 1 square knitting process was systematically studied by means of experiment and control volume respectively. The assumption of oval cross-section of the yarn is proposed, taking into account the influence of the fineness of the braided yarn and the filling factor of the braided yarn. According to the characteristics of the movement path of the yarn carrier in the process of weaving, the preform is divided into three different areas of internal, surface and angular. Different control volume elements are defined respectively. Two kinds of local cell models of the preform are identified , Analyzed the yarn preform structure, and derived the relationship between the parameters of the woven structure. It provides sufficient conditions for the analysis of stiffness and strength of braided composites.