SIMULATION ANALYSIS OF EDGE EFFECTS DURING MOULD FILLING IN RTM PROCESS
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摘要: RTM工艺需将纤维预制体预置到模具中,由于纤维预制体结构不均匀性和模具形状、尺寸等影响,极易产生边缘效应。边缘效应会严重影响树脂流场发展和压力场分布。本文作者采用等效渗透系数方法模拟边缘效应,得到了其影响下的树脂流动前峰曲线和压力场。研究表明:一方面边缘效应可能导致不期望的树脂流场发展而形成工艺缺陷——干斑;另一方面可以利用边缘效应提高工艺效率:常流率注射时减小合模压力和注射压力,常压力注射时可以减少注模时间。Abstract: In RTM, it needs pre-placing fibrous preform into the mold. It is most probable to create an edge effect, which offers injected resin paths of least resistance due to the variation of fibrous preform structure and the shape and dimension of the mold. The edge effect may drastically affect resin flow front advancement and the distribution of pressure fields. In this paper, simulations are carried out with the approach of equivalent permeability, and the resin flow front curve and pressure fields with flow channels are obtained. The studies demonstrate that on the one hand the edge effect may lead to the unwanted effect on resin flow fields to form defects——dry spot, on the other hand it may be used to enhance the mold filling process: reduction of mold and injection pressures at constant flow rate injection; shorter fill time at constant pressure injection.
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Keywords:
- simulation /
- edge effect /
- resin transfer molding (RTM) /
- resin
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