【摘要】 基于ANSYS参数化设计语言(ANSYS parametric design language,APDL)采用规则六面体单元建立参数化的三维四向编织预制件网格模型。提出增强相单胞网格提取算法,实现三维四向编织复合材料增强相参数化单胞网格模型的提取。在增强相单胞网格提取算法中,针对单胞边界面与单元的相对位置关系归纳出的单元分割情况共有36种,其中六面体14种、三棱柱19种、四面体3种。基于Fortran语言编写单元提取和再重组程序,通过ANSYS代码数据库接口实现Fortran程序与ANSYS软件间高效的数据传递。计算纱线填充因子对三维四向编织复合材料单胞纤维体积分数的影响关系。联合区域叠合技术与增强相单胞网格提取算法,通过施加应力加载的周期性边界条件,预测三维四向编织复合材料的弹性性能,数值预测结果与试验吻合较好,并进一步得出编织角和纤维体积分数对三维四向编织复合材料弹性性能的影响规律。更多还原

【Abstract】 3D parametric braided prefabricated model is established by ANSYS parametric design language(APDL), the algorithm of extracting unit cell from reinforcement mesh is proposed, so the parametric reinforcement unit cell model can be established. In this algorithm, thirty-six conditions are included based on relative position between unit cell boundaries and element, fourteen conditions for hexahedral, nineteen conditions for prism, three conditions for tetrahedral. The code of element extracting is written in Fortran language. The data from user written code to ANSYS software is transferred via ANSYS database interface efficiently. The relationship between yarn filling factor and fiber volume fraction is obtained. After applied appropriate force boundary conditions, the elastic properties of 3D four-directional braided composites are predicted, and numerical results show good agreement with experiment datas. The effects on the elastic constants of 3D braided composites from the braiding angle and fiber volume fraction are investigated in detail.更多还原