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基于复合材料液态模塑(LCM)工艺过程中存在半饱和区域的实验现象以及对预制体双尺度效应的逐步认识,一些学者提出用沉浸模型来研究双尺度多孔介质的不饱和流动。通过体积均匀化方法描述了双尺度多孔介质复合材料液态模塑工艺模型的特征,得到含有沉浸项的双尺度多孔介质的质量守恒方程,并采用有限元法对方程进行数值求解,通过具体算例计算了考虑双尺度效应时恒压树脂注射下不同时段的压力分布状态,得到树脂在填充过程中流动前沿半饱和区域从出现到消失的过程,采用不同注射压力进行模拟并比较。结果表明,与单尺度多孔介质模型不同,双尺度多孔介质模型更能反映实际树脂填充过程中出现的半饱和区域现象。
Based on the experimental phenomena of semi-saturated region in LCM process and the gradual understanding of the double-scale effect of preform, some scholars proposed immersion model to study the unsaturated flow in two-scale porous media. The characteristics of liquid molding process model for two-scale porous media composite were described by means of volume homogenization. The mass conservation equation of two-scale porous media with immersion term was obtained. The equations were numerically solved by finite element method. The pressure distribution in different time periods of constant pressure resin injection considering double scale effect was calculated. The process of front half saturation region from appearance to disappearance of resin during filling was obtained, and different injection pressures were used to simulate and compare. The results show that, unlike the single-scale porous media model, the dual-scale porous media model can better reflect the phenomenon of semi-saturated region appearing in the process of resin filling.