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预定型织物是一种用于纺织复合材料液态成型的新型材料,可以提高复合材料构件的形状精度和尺寸精度。由于织物中存在定型剂,使织物材料的性能发生改变。基于像框剪切试验,建立预定型平纹织物剪切变形的理论模型。与干态织物相比,重点分析了预定型织物中纱线的弯曲刚度和纱线摩擦系数的变化对剪切性能的影响;同时模型中考虑了剪切过程中纱线轴向力的变化对剪切性能的影响。另外,利用立式显微镜观察了在纱线挤压阶段纱线宽度变化的规律,考虑了定型剂和织物结构对纱线宽度变化的影响。根据平衡方程得到预定型平纹织物的剪切模型,通过与试验结果比较,该模型可以较好地预测预定型平纹织物的剪切变形性能。
The predetermined type of fabric is a new type of material used in the liquid forming of textile composites, which can improve the shape accuracy and dimensional accuracy of the composite material. Due to the presence of the styling agent in the fabric, the properties of the fabric material are altered. Based on the image frame shear test, a theoretical model of the shear deformation of the pre-determined plain weave fabric was established. Compared with dry fabric, the influence of the bending stiffness of yarn and the friction coefficient of yarn on the shear properties of the pre-decided fabric is analyzed. Meanwhile, the changes of the axial force during the cutting process Effect of shear properties. In addition, the variation of yarn width in the yarn extrusion stage was observed by using a vertical microscope, and the influence of the sizing agent and the fabric structure on the yarn width variation was considered. According to the equilibrium equation, the shear model of the plain weave fabric was obtained. Compared with the experimental results, the model can predict the shear deformation performance of the plain weave fabric.