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首页> 外文期刊>Polymer Composites >Fast Liquid Composite Molding Simulation of Unsaturated Flow in Dual-Scale Fiber Mats Using the Imbibition Characteristics of a Fabric-Based Unit Cell
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Fast Liquid Composite Molding Simulation of Unsaturated Flow in Dual-Scale Fiber Mats Using the Imbibition Characteristics of a Fabric-Based Unit Cell

机译：利用基于织物的晶胞的吸着特性，快速进行不饱和流动在双尺度纤维毡中的快速液体复合成型模拟

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摘要

The use of the dual-scale fiber mats in liquid composite molding (LCM) process for making composites parts gives rise to the unsaturated flow during the mold-filling process. The usual approaches for modeling such flows involve using a sink term in the mass balance equation along with the Darcy's law. Sink functions involving complex microflows inside tows with realistic tow geometries have not been attempted in the past because of the problem of high computational costs arising from the coupling of the macroscopic gap flows with the microscopic tow flows. In this study, a new 'lumped' sink function is proposed for the isothermal flow simulation, which is a function of the gap pressure, capillary pressure, and tow saturation, and which is estimated without solving for the microscopic tow simulations at each node of the FE mesh in the finite element/control volume algorithm. The sink function is calibrated with the help of the tow micro-flow simulation in a stand-alone unit cell of the dual-scale fiber mat. This new approach, which does not use any fitting parameters, achieved a good validation against a previous published result on the 1D unsaturated flow in a biaxial stitched mat—satisfactory comparisons of the inlet-pressure history as well as the saturation distributions were achieved. Finally, the unsaturated flow is studied in a car hood-type LCM mold geometry using the code PORE-FLOW based on the proposed algorithm.
机译：在液态复合成型（LCM）工艺中使用双尺度纤维毡制造复合材料零件会在模具填充过程中引起不饱和流动。对这种流动进行建模的常用方法包括在质量平衡方程中使用吸收项以及达西定律。过去，由于宏观间隙流与微观丝束流的耦合产生了高计算成本的问题，因此尚未尝试使用具有现实丝束几何形状的丝束中涉及复杂微流的水槽功能。在这项研究中，为等温流动模拟提出了一个新的“集总”吸收函数，该函数是间隙压力，毛细压力和丝束饱和度的函数，在不求解微观丝束模拟的情况下对其进行了估算有限元/控制体积算法中的有限元网格。在双尺度纤维垫的独立单元中，借助拖曳微流模拟对接收器功能进行了校准。这种不使用任何拟合参数的新方法，已针对先前公布的双轴缝合垫中一维不饱和流的结果进行了很好的验证-令人满意地比较了进口压力历史记录和饱和度分布。最后，基于所提出的算法，使用代码PORE-FLOW研究了汽车罩型LCM模具几何形状中的非饱和流动。

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