五轴向立体机织物的单元体结构分析

分析了斜向纱的排列方式对五轴向立体机织物的结构和Z向纱密度的影响,获得了2种类型的五轴向立体机织物结构:一种结构稀疏,Z向纱密度小;另一种结构紧密,Z向纱密度大。以紧密结构的五轴向立体织物为研究对象,建立了该织物的单元体结构模型,采用解析几何方法,计算了Z向纱的截面形状,根据Wβ/WX、Wβ/WY与cosβ、sinβ的关系,Z向纱的截面形状可呈八边形、六边形和四边形等不同形状。

Unit-cell structural analysis of the five-axial three-dimensional woven fabric

The effect of diagonal arrangement of yarns on the structure of the five-axial three-dimensional((3-D)) woven fabric and the density of yarns in Z direction were analyzed,and two kinds of five-axial 3_D fabric structure were obtained. One was in loose structure with low density of the yarns in Z direction and the other was in compact structure having high density of the yarns in Z direction.Based on the compact five-axial(3-D) fabric,this paper constructed the unit_cell model for the five-axial 3_D fabric.Using analytic geometrical method, the cross-section of the yarns in Z direction was calculated.According to the relationships between W_β/W_X,W_β/W_Y with cos β,sin β,it was found that the cross-section shapes of the yarns in Z direction can be octagon,hexagon or quadrilateral.