预浸机织织物二维剪切性能模型

Two-dimensional shear models of prepreg woven fabrics

利用安装在拉伸试验机上的像框剪切装置,研究了平纹预浸碳纤维机织织物的剪切行为。研究发现,预浸碳纤维织物的剪切行为与织物的分阶段剪切行为类似。根据实验结果,分两个不同剪切阶段建立了预浸碳纤维织物的二维剪切性能模型。在剪切初始阶段,利用扭力弹簧来模拟纱线交叉点之间的剪切摩擦,通过实验确定了扭力弹簧扭转刚度系数。在剪切第二阶段,给出了载荷与剪切角之间的关系模型。试验结果表明,利用扭力弹簧可以很好地模拟剪切初始阶段的剪切摩擦。

The properties of plain carbon fabric prepreg were researched using a picture frame shear rig which is installed on a mechanical test machine. The result shows that the shear properties of the fabric prepreg were similar to those of the pure fabric, which has different properties during different shear stages. According to the experiment data, two-dimensional shear models were set up in two different shear stages. At the beginning of the shear stage,a torsion spring was used to simulate the friction of the cross point of the warp and the weft in the prepreg fabric.The torsion stiffness coefficient of the torsion spring was determined on experiment. In the second shear stage, the relationship of shear angle and load was given. It is proved that the torsion spring can simulate the shear friction well in the first shear stage.