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Modeling the effect of fiber diameter and fiber bundle count on tow impregnation during liquid molding processes

机译：在液体成型过程中模拟纤维直径和纤维束数对丝束浸渍的影响

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摘要

This paper explores the effect of fiber diameter and fiber bundle count on tow impregnation during liquid molding processes. Resin and fiber wetting properties play an important role on the resin infiltration behavior within a single fiber tow. Dynamic and equilibrium microflow models, based on Darcy's Law and force equilibrium at the resin flow front, assume that the infiltration of the resin is driven through capillary pressure and hindered by the entrapped gas within the tow. The results of the dynamic model show that the fiber tow count and the fiber diameter have a significant effect on the tow infiltration time. The infiltration time is 10 times longer for a 60 K carbon fiber tow than for a 6 K one. The infiltration time is also inversely proportional to the fiber diameter. As the fiber diameter is decreased 100 times, from 3.5 mu m to 35 nm, the infiltration time increases 100 times for the same diameter tow. It also shows that fiber volume fraction also has a significant effect on the tow infiltration time and any fiber volume variations along the fiber tow could lead to dry spots in the composite due to the large differences in infiltration rates. The model indicates that the entrapment of a critical amount of air within a tow will lead to higher than acceptable void contents.
机译：本文探讨了纤维直径和纤维束数对液体成型过程中丝束浸渍的影响。树脂和纤维的润湿性能对单个纤维束中的树脂渗透行为起着重要作用。基于达西定律和树脂流动前沿的力平衡的动态和平衡微流模型假定，树脂的渗透是通过毛细管压力驱动的，并受到丝束内截留气体的阻碍。动态模型的结果表明，纤维丝束数和纤维直径对丝束渗透时间有显着影响。 60 K碳纤维丝束的渗透时间比6 K碳纤维丝束的渗透时间长10倍。渗透时间也与纤维直径成反比。随着纤维直径从3.5微米减小到35纳米，减小了100倍，对于相同直径的丝束，渗透时间增加了100倍。这也表明纤维体积分数也对丝束渗透时间有显着影响，并且由于渗透率的巨大差异，沿纤维束的任何纤维体积变化都可能导致复合材料中出现干斑。该模型表明，一束临界空气夹带会导致高于可接受的空隙率。

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