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XCT-scan assisted flow path analysis and permeability prediction of a 3D woven fabric

机译：XCT扫描辅助的3D机织织物的流路分析和渗透性预测

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摘要

Compaction response and resin flow through a fabric are key characterization parameters in Liquid Composite Molding (LCM) processes. In this study, we present a detailed flow path analysis of a complex 3D woven angle interlock fabric using an in-situ X-ray micro computed tomography (XCT) experimental set-up. The set-up is used to obtain the reinforcement compaction response and three principle permeability values at different thicknesses in a single experiment. The compaction provides real-time features of inter-tow gaps, as well as elongation/spreading of weft and warp tows associated with a through-thickness deformation of the binder yarn. The reduction of the pore network during compaction is analyzed through pore size distribution using a granulometry and percolation path analysis. The resin flow path and reinforcement permeability in principle directions are predicted through vigorous digital flow simulations using several computational unit cells extracted from the reconstructed 3D models from XCT scans. The resin flow paths and principle permeability values show a very strong dependence on the solid volume fraction of the scanned images. A relationship between the solid volume fraction and permeability is developed using a modified Kozeny-Carman relation. The predicted permeability values were found to be in good agreement with traditional benchmark experimental data, highlighting the utility of this novel technique.
机译：压实响应和树脂通过织物的流动是液体复合成型（LCM）工艺中的关键表征参数。在这项研究中，我们介绍了使用原位X射线微计算机断层扫描（XCT）实验装置对复杂的3D编织角度互锁织物进行详细的流路分析。该设置用于在单个实验中获得不同厚度下的钢筋压实响应和三个主要渗透率值。压实提供了丝束间间隙的实时特征，以及与接结纱的整个厚度变形相关的纬纱和经纱的伸长/散布。使用粒度分析和渗流路径分析，通过孔径分布分析压实过程中孔隙网络的减少。通过使用从XCT扫描重建的3D模型中提取的几个计算单位像元，通过剧烈的数字流动仿真，可以预测树脂在主要方向上的流动路径和增强渗透性。树脂的流动路径和主渗透率值显示出对扫描图像的固体体积分数的强烈依赖性。固体体积分数和渗透率之间的关系是使用改进的Kozeny-Carman关系建立的。发现预测的渗透率值与传统的基准实验数据高度吻合，突出了该新技术的实用性。

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