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研究了层间“离位”附载多孔薄膜结构形式增韧层的大厚度纤维预成型体中等代流体(树脂)沿预成型体厚度方向(z向)的流动行为,通过压力传感器监测z向流动RTM(z-RTM)工艺注射过程中进、出胶口压力的变化规律,进一步反推树脂在层间“离位”增韧与非增韧预成型体中的宏观流动及微观浸润模式。结果表明,在zRTM工艺注射过程中,树脂在沿纤维束间z向快速流动的同时完成对纤维丝束内部的浸润。层间“离位”附载的增韧层虽延缓了树脂的宏观流动,但使流动前锋曲面更加平滑。层间“离位”增韧预成型体z向渗透率为3.5×10-15 m2,与非增韧预成型体的z向渗透率2.9×10-14 m2相比,降低约一个数量级。
The flow behavior of the secondary generation fluid (resin) in the thickness direction (z direction) of the preform in the large-thickness fiber preform with the toughening layer with porous membrane structure attached to the interlayer was investigated. The pressure sensor was used to monitor the z The variation of pressure at the inlet and outlet during the injection of RTM (z-RTM) process was used to further reverse the macroscopic flow and microstructure of the resin in the interlayers of “toughened” and non-toughened preforms Infiltration mode. The results showed that during the zRTM process injection, the resin infiltrated inside the fiber tows while flowing rapidly along the z-direction between the fiber tows. The interlaminar “off-bit ” attached toughened layer slows the macroscopic flow of resin, but smoothes the flow front surface. The z-direction permeability of the “off-site” toughened preforms was 3.5 × 10-15 m2, which was about one order of magnitude lower than the z-direction permeability of 2.9 × 10-14 m2 of non-toughened preforms .