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Characterization and Analysis of In-Plane Shear Behavior of Glass Warp-Knitted Non-Crimp Fabrics Based on Picture Frame Method

机译：基于镜框法的玻璃经编非卷曲织物的面内剪切特性表征与分析

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Glass warp-knitted fabrics have been widely used as complex structural reinforcements in composites, such as wind turbine blades, boats, vehicles, etc. Understanding the mechanical behavior and formability of these textiles is very necessary for the simulation of forming processes before manufacturing. In this paper, the shear deformation mechanics of glass warp-knitted non-crimp fabrics (WKNCF) were experimentally investigated based on a picture frame testing apparatus equipped to a universal testing machine. Three commercially available fabrics of WKNCFs were tested for four cycles by the picture frame method. The aim was to characterize and compare the shear behavior of relatively high areal density fabrics during preform processing for composites. The energy normalization theory was used to obtain the normalized shear force from the testing machine data; then, the shear stress against the shear angle was fitted by cubic polynomial regression equations. The results achieved from the equations demonstrated that the in-plane shear rigidity modulus was associated with the shear angle. The effect of the shearing cycles and stitching pattern on shear resistance was also analyzed.
机译：玻璃经编织物已广泛用作复合材料中的复杂结构增强材料，例如风力涡轮机叶片，船艇，车辆等。了解这些织物的机械性能和可成型性对于在制造之前模拟成型过程非常必要。本文基于装有通用测试机的相框测试装置，对玻璃经编非卷曲织物（WKNCF）的剪切变形力学进行了实验研究。通过相框方法，将三种市售WKNCF织物测试了四个循环。目的是表征和比较在复合材料的预成型件加工过程中相对较高的面密度织物的剪切性能。能量归一化理论被用来从试验机数据中获得归一化的剪切力。然后，通过三次多项式回归方程拟合相对于剪切角的剪切应力。从方程式获得的结果表明，面内剪切刚度模量与剪切角相关。还分析了剪切循环和缝合图案对剪切强度的影响。

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