z向流动RTM工艺树脂的流动浸润行为

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 z-RTM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^-15m²,与非增韧预成型体的z向渗透率2.9×10^-14m²相比,降低约一个数量级。

Investigation of resin flowing and infiltration behavior during z direction flowing RTM process

The flowing and infiltration behaviors of the equivalent fluid (resin), which passed through the thickness direction (z direction) of large thickness un-toughened and "ex-situ" toughened preforms were studied. The pressure variation of inlet and outlet pot were monitored respectively by pressure transducers during z direction flowing RTM (z-RTM) process. Based on the pressure curves, the macro-flowing and micro-infiltrition behaviors of the "resin" inside the "ex-situ"toughened preforms and untoughened preforms were deduced. The results show that the resin flow along the z direction between the gap of fiber bundles and at the same time infiltrated the intra fiber bundles during the injection stage of z-RTM process. The "ex-situ" toughener will delay the resin macro-flowing, however the resin flow front will be smoothed by the interlaminar toughener. Compared with the un-toughened preform, the introducing of interlaminar toughening agent reduces the z-direction permeability of the preform from 2.9×10^-14m² to 3.5×10^-15m².