The accurate characterization of fabrics used in vacuum assisted resin transfer molding (VARTM) is essential in order to model the flow through these porous preforms. A wide range of these fabrics are available for composite manufacturing through VARTM and thus brings about a need to opt a methodology which characterizes the in-plane permeability of these preforms. These permeability values can then be used in simulations that can track the flow front progression and mold filling time. This work identifies the permeability of an E-glass fabric based on Darcy's law. Woven fabric having areal weight of 200 grams per square meter (gsm) is under consideration. The experiments are conducted at constant pressure conditions using 2D Radial flow method. Stereo microscopy of the preform material is done for detailed study of the weaving pattern. It is concluded that plain woven fabric exhibits anisotropic behavior when tested for in-plane permeability. Permeability is found to be higher in a direction which offers more interspacing between adjacent fibers threads causing more resin to flow in this direction.

中文翻译：

---

二维径向流法测量双轴机织织物的面内渗透率

为了对通过这些多孔预成型坯的流动进行建模，在真空辅助树脂传递模塑（VARTM）中使用的织物的准确表征至关重要。这些织物的种类繁多，可通过VARTM用于复合材料制造，因此需要选择一种表征这些预成型件的面内渗透性的方法。然后，可以将这些渗透率值用于模拟中，以跟踪流动前沿的进展和模具的填充时间。这项工作基于达西定律确定了电子玻璃织物的渗透性。正在考虑单位面积重量为200克/平方米（gsm）的机织织物。实验是在恒定压力条件下使用2D径向流方法进行的。预成型材料的立体显微镜用于织造图案的详细研究。结论是，平纹织物在进行面内渗透性测试时表现出各向异性。发现在一个方向上的渗透性更高，该方向在相邻的纤维线之间提供更多的间隔，从而导致更多的树脂在该方向上流动。