Effect of horizontal shift between fabric layers on the meso-scale-void formation in liquid composite molding

Effect of horizontal shift between fabric layers on the meso-scale-void formation in liquid composite molding
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液体复合材料成型中织物层之间的水平位移对细观孔隙形成的影响

DOI:
10.3144/expresspolymlett.2019.42
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发表时间:
2019
影响因子:
3.3
通讯作者:
Wang S L
Wang S L
中科院分区:
化学3区
文献类型:
--
作者:
Yang B;Zhao C Y;Bi F Y;Wang S B;Ma C;Wang S L

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. 准确的孔隙率预测是液体复合成型工艺优化的基础。在充型过程中,空洞的形成是一个三维流动过程,而目前将空洞的形成处理为面内空气夹持的结果,完全忽略了树脂和空气在厚度方向上的流动。本文考虑树脂在相邻层中的流动,分析三维空气夹持和中尺度孔隙的形成。首先分析了织物层间的水平位移,总结了不同位移状态下的中孔覆盖模式。然后在微观和中观流动数学模型的基础上,详细研究了不同包层流动模式下的三维空穴夹带过程,建立了预测中观尺度空穴形成的数学模型。最后,进行了一系列的充型和空隙测量实验来验证上述模型。
. Accurate prediction of void content is the foundation of process optimization for Liquid Composite Molding (LCM). During mold filling, void formation is a three-dimensional flow process, while at present the void formation is treated as a result of in-plane air entrapment, the resin and air flows on the thickness direction are totally neglected. In this paper, resin flows in the adjacent layers are considered to analyze the three-dimensional air entrapment and the meso-scale-void formation. Firstly, the horizontal shift between fabric layers is analyzed, the mesopore coverage modes under different shift states are summarized. Then based on the mathematical models of micro and meso flows, the three-dimensional void entrapment processes under different cladding flow modes are studied in detail, a mathematical model for the prediction of meso-scale-void formation is established. Finally, a series of mold filling and void measurement experiments are carried out to verify the above model.
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