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An experimental method to continuously measure permeability of fiber preforms as a function of fiber volume fraction

机译:一种连续测量纤维预制棒渗透率随纤维体积分数变化的实验方法

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摘要

Liquid composite molding processes have the potential to produce complex shaped part utilizing tailored fiber reinforcements and inserts. Existing simulation tools have the capability to predict the flow front advancement as the resin impregnates the fiber preform to saturate it, thus minimizing cost intensive trial and error approaches to successful mold filling. An important input to such simulations is the permeability of fiber preforms, which describes is resistance to flow. Permeability is a function of the fiber architecture and fiber volume fraction. Traditional experimental methods to measure permeability allow one to obtain a single value at a prefixed fiber volume fraction; hence, if one wants to obtain permeability over a wide range of fiber volume fractions, a multitude of experiments are necessary. This paper introduces a novel approach to determine permeability over a wide range of fiber volume fractions in one continuous experiment using the same preform. Repeatable results of woven glass fabrics over a range of fiber volume fraction are presented.
机译:液体复合材料成型工艺具有利用定制的纤维增强材料和嵌件生产复杂形状零件的潜力。现有的模拟工具能够预测树脂浸渍纤维预成型坯以使其饱和的流动前沿的进展,从而最大程度地减少了成本高昂的尝试和错误方法以成功填充模具的过程。这种模拟的一个重要输入是纤维预成型件的渗透性,它描述了流动阻力。渗透率是纤维结构和纤维体积分数的函数。传统的测量渗透率的实验方法使人们可以在预定的纤维体积分数下获得单一值;因此,如果要在很宽的纤维体积分数范围内获得渗透性,就需要进行大量的实验。本文介绍了一种新颖的方法,可以在使用相同预成型件的连续实验中确定各种纤维体积分数下的渗透率。给出了玻璃纤维织物在一定的纤维体积分数范围内的可重复结果。

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