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牛改变.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.
Tackified fabric is the material which is used in liquid composite molding,and it can improve the shape precision and dimension precision of the composite component.The property of the fabric is changed due to the tackifier.Based on the picture frame experiment,a theoretical model was built.The effects of the bending rigidity and friction coefficient of tackified yarn on the shear behavior were analysed in the article,and the axial force of yarn during the shear process was considered in the model.In addition,the variation of width of tackified yarn during the shear loading was observed by the microscope,and the influence of tackifier and fabric architecture was considered.An shear model was derived from the equilibrium equation.The results show that the model can predict the shear performance of the tackified plain fabric well.
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