树脂膜熔渗工艺充模过程的模拟与分析

Simulation and analysis of model filling of resin film infusion process

树脂膜熔渗工艺(RFI)是一种新型的复合材料成型工艺.为了更深入了解树脂膜熔渗工艺过程中充模阶段的控制参数对制品质量的影响,避免制品出现空斑、充模不完全等问题,针对该工艺过程中树脂在复杂形状预制件中的流动行为进行了分析,在达西定律基础上建立了二维等温流动控制方程,利用有限元/控制体方法建立了数值分析模型,编制了FORTRAN程序进行模拟运算,并讨论了流动过程中施加的压力对充模时间的影响.由计算实例可见,所编制程序能够很好地预测树脂膜熔渗工艺过程中充模时间、各个时刻树脂的流动前沿位置及模腔中的压力分布.

Resin film infusion （RFI） is a new technique for the manufacture of composite structures. In order to understand the influences of control parameters on the quality of product in mold filling of RFI deeply and to avoid plaque formation and incomplete filling, a control equation is set up based on Darcy＇s Law, which can describe the flow behavior in mold filling of RFI. The finite element control volume method was chosen to develop a two-dimensional model, which could be used to simulate isothermal infiltration of a hot-melt resin into a complex shape textile perform. The application of this model was discussed. Results of the simulation were used to forecast the filling time, flow front and pressure distributing. The effect of compaction pressure on the resin infiltration time was also studied.