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首页> 外文期刊>International Journal of Material Forming: Official Journal of the European Scientific Association for Material Forming - ESAFORM >Prediction of optimal flow front velocity to minimize void formation in dual scale fibrous reinforcements
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Prediction of optimal flow front velocity to minimize void formation in dual scale fibrous reinforcements

机译：预测最佳流前速度以最小化双尺度纤维增强材料中空隙的形成

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摘要

Liquid Composite Molding (LCM) is an increasingly used class of processes to manufacture high performance composites. Engineering fabrics commonly used in LCM generally have a dual scale architecture in terms of porosity: microscopic pores exist between the filaments in the fiber tows, while macroscopic pores appear between the tows. Capillary flows in fiber tows play a major role on the quality of composites made by resin injection through fibrous reinforcements. This paper reports on an investigation on fabric imbibition characterization and subsequent evaluation of the optimal flow front velocity during resin injection through fibrous reinforcements. The goal is to devise more robust LCM processes and improve part quality. In order to evaluate a priori the injection conditions that minimize void formation, an impregnation model is developed based on imbibition characterization. This approach allows predicting the optimal front velocity without having to model complex dual scale flows through fibrous reinforcements and without performing expensive and time-consuming fabrication tests. After a summary of previous imbibition results obtained with a probe fluid, the optimal modified capillary numbers are computed by the new predictive model and the values are compared with results reported in the literature on void formation in LCM processes. Afterwards, capillary rise measurements are carried out with four infiltration fluids in order to evaluate the range of optimal flow front velocity that minimizes void formation. This characterization is implemented with vinyl ester resin, epoxy anhydride resin, styrene and anhydride. Finally, the optimal flow front velocity is evaluated for several fabric configurations.
机译：液体复合材料成型（LCM）是制造高性能复合材料的一种越来越常用的方法。在孔隙率方面，LCM中常用的工程织物通常具有双重尺度的结构：纤维丝束中的细丝之间存在微观孔，而丝束之间则存在宏观孔。纤维束中的毛细管流动对通过纤维增强树脂注入树脂制成的复合材料的质量起着重要作用。本文报道了对织物吸水特性的研究，并随后评估了通过纤维增强材料注入树脂期间的最佳流动前沿速度。目的是设计更强大的LCM工艺并提高零件质量。为了先验地评估使空隙形成最小化的注射条件，基于吸水特性开发了一种浸渍模型。这种方法可以预测最佳的前端速度，而不必对通过纤维增强材料的复杂双尺度流建模，也无需执行昂贵且费时的制造测试。在总结了使用探针流体获得的先前吸水结果之后，通过新的预测模型计算了最佳的改良毛细管数，并将其值与文献中有关LCM工艺中形成空隙的结果进行了比较。然后，用四种浸润液进行毛细管上升测量，以评估使空洞形成最小化的最佳流动前沿速度范围。该表征通过乙烯基酯树脂，环氧酸酐树脂，苯乙烯和酸酐来实现。最后，评估了几种织物构型的最佳流动前沿速度。

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