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首页> 外文会议>Proceedings of the American Society for Composites Twenty-Ninth technical conference, Proceedings of the 16th US-JAPAN conference on composite materials ASTM-D30 meeting >Modeling Advancing Flow Fronts in Composite Manufacturing
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Modeling Advancing Flow Fronts in Composite Manufacturing

机译：在复合制造中建模前进流前沿

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摘要

Flow front propagation in liquid composite molding is subject to the fiberrnarchitecture, resin properties, and the preform geometry being infused. Definingrnaccurate resin flow fronts for complex woven fabrics is challenging as the permeatingrnfluid often progresses in an uneven “fingering” manner due to variable porosity andrnflow channels created by the textile geometry. Accurately modeling the advancingrnflow fronts in liquid composite molding is important, as air entrapment and voidrnformation can arise due to the resin and air phase interaction at the flow front. Thesernare important considerations for mold design, prediction of voids, and finished partrnevaluation. The research described here presents simulations of the advancing resinrnflow front through textile preforms. A tetrahedral based mesh is generated fromrnTexGen scripts modeled from a unit cell of textile geometry, and mesh independencernis seen for a sufficiently refined mesh. A computationally efficient, unit cell-basedrnsolution is shown to account for the intricacies of the air to resin phase transition seenrnon the meso-scale in actual mold fills. A multiphase, transient finite volume solution isrnfound in Fluent using the generated mesh, and post-processed to produce an advancingrnflow front simulation. For model validation, a plain weave Shield Strand S fabric isrnfirst characterized geometrically for TexGen input parameters. Then, experimentalrnadvancing flow front infusions are conducted with an instrumented line-source to linesinkrnvisualization fixture. Model and experimental flow fronts are compared, yieldingrnfavorable qualitative results.
机译：液体复合材料成型中的流锋传播受纤维结构，树脂性能和预成型坯几何形状的影响。为复杂的机织织物定义准确的树脂流动前沿非常具有挑战性，因为由于纺织品几何形状产生的可变孔隙率和流动通道，渗透流体通常以不均匀的“指状”方式进行。在液体复合材料成型过程中，准确地对前进的流动前沿进行建模非常重要，因为由于流动前沿的树脂和气相相互作用，会导致空气截留和空隙形成。这些是模具设计，空隙预测和成品评估的重要考虑因素。此处描述的研究提供了通过纺织品预成型坯前进的树脂流动前沿的模拟。基于四面体的网格是从rnTexGen脚本生成的，该脚本是根据纺织品几何形状的单元格建模的，并且可以看到网格独立性，可以得到足够精细的网格。显示了一种计算有效的，基于晶胞的解决方案，说明了在实际模具填充过程中细观尺度下空气到树脂相变的复杂性。使用生成的网格在Fluent中找到一个多相瞬态有限体积解，并对其进行后处理以生成一个高级流前仿真。为了进行模型验证，首先对TexGen输入参数进行几何表征的平纹Shield Strand S织物。然后，用仪器化的线源对线墨可视化固定装置进行实验性的先进流前注入。比较了模型和实验流场，得出了良好的定性结果。

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