穿孔泡沫夹芯复合材料灌注工艺仿真与方案优选

以穿孔泡沫夹芯复合材料为研究对象，对其真空辅助树脂灌注(VARI)工艺进行了实验研究、仿真分析和方案优选。首先，通过实验测试与数值计算分别得到穿孔夹芯结构织物与芯材孔洞的渗透率；然后，对穿孔夹芯结构灌注过程进行三维仿真模拟，并通过实尺度灌注实验验证了仿真模拟的可靠性；最后，基于验证的仿真模型进行工艺参数优选，拟合得到了灌注时间的预测模型。结果表明：数值仿真与实验值基本吻合，能较准确地模拟穿孔夹芯结构成型时的流动过程和孔隙分布；灌注时间的预测模型可用于指导实际生产；通过优化成型工艺参数可控制树脂的流动行为，达到缩短成型时间和降低构件孔隙率的目的。

Simulation and optimization of infusion process for perforated foam sandwich composite

The numerical simulation of the vacuum assisted resin infusion (VARI) process of perforated sandwich composite was verified experimentally, and process optimization was presented thereafter. Firstly, the permeabilities of the fabric and holes of perforated core were obtained experimentally and numerically, respectively. Then, 3D simulation was carried out for the infusion process of the perforated sandwich composite structure and verified by real-scale infusion experiments. Finally, based on the simulation, the process was optimized by investigating the effects of injection position and type on the filling time and product porosity, and later a methodology was proposed to predict the filling time needed. The results show that the numerical simulation is in good agreement with the experiment. The flow patterns during the filling and the porosities of the perforated sandwich structures are in good match with experimental results. The filling time prediction method can be used for practical production instruction. The selection of proper parameters, such as injection position and type, can minimize molding time and product porosity.