恒压下树脂在双尺度多孔介质中的流动特性

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。

Characteristics of resin flow at constant pressure in dual-scale porous media

Based on the process of liquid composite molding(LCM),it existed unsaturated regional experiment phenomenon,can be understood flow in dual-scale porous media gradually.Some scholars proposed to use sink model to study of unsaturated flow in dual-scale porous media.The features of dual-scale porous media in the LCM by volume averaging method were described,and dual-scale LCM mass conservation equation which contained sink term was obtained,and the finite element method was used to solve differential equation numerically.Through a specific example,under the condition of constant pressure,the pressure distribution in the different periods in dual-scale porous media is calculated.The change process of unsaturated regional near resin flow front is got.The different injection pressures are used to simulate and compare.Compared with single-scale porous media,dual-scale porous media can reflect unsaturated regional phenomenon in practical filling process better.