【摘要】 针对有限元计算对几何数据的需要 ,详细研究了由四步 1∶ 1法编织的复合材料三维四向矩形编织物的角柱结构 ,为其建立了准确的几何模型。以矢量方法导出纺纱 (纤维束 )角柱段轴线、以及角柱段与内部段、角柱段与角柱段的接触线等的数学表达式。据此得到角柱结构几何参数值 ,它们可用于该材料的图形显示和力学分析更多还原

【Abstract】 To meet the need for geometric data in finite element investigation, a study on the corner microstructure of three dimensional(3 D) 4 directional rectangular composite preforms braided by 4 step 1∶1 procedure is made, and a accurate geometry model of the structure is developed. The vector method is used to deduce some mathematic expressions of, the axis of yarn(fiber bundle) at fabric corner, the contact curves at which a yarn at fabric corner touches with one at fabric interior & one at fabric corner, and etc. These formulas supply the geometric parameters of corner microstructure, which are useful to graphic emulation and mechanical analysis of this material.更多还原