纱线间距对复合材料拉伸性能的影响

Effect of Yarn Spacing on Tensile Property of Composites

为研究纱线间距对编织复合材料拉伸性能的影响,课题组建立了4组纱线间距的芳纶纤维橡胶基复合材料单胞模型;并通过有限元软件对沿经(纬)纱和纤维束交织2种拉伸方向的单胞模型进行拉伸性能仿真分析。结果表明:随着纱线间距的增加基体和增强相的等效应力逐渐增大,且沿经(纬)纱方向拉伸的等效应力小于纤维束交织方向;通过均质化理论计算出复合材料等效弹性常数,弹性模量随着纱线间距的增加逐渐减小,经(纬)纱方向计算的弹性模量平均高出纤维束交织方向21%。

In order to study the effect of yarn spacingon the tensile properties of its macro-structure, a unite-cell model of aramid fiber rubber matrix composites withfour sets of yarn spacing was established. Tensile property simulation analysis was performed on unite-cell model interwoven in two tensile directions along warp(weft) yarn and fiber bundle by finite element software. The results show thatthe equivalent force of the matrix and the reinforcement gradually increases with the increase of the yarn spacing, and the equivalence force of stretching along the warp(weft) yarn direction is smaller than that of the fiber bundleinterweaving direction.The equivalent elastic constants of the composites are calculated by homogenization theory, the modulus of elasticity gradually decreases with the increase of yarn spacing, and the modulus of elasticitycalculated in the warp(weft) yarn direction is on average 21% higher than that in the fiber bundle interweaving direction.