自动铺放工艺制备罐外固化复合材料的力学行为

针对碳纤维增强树脂基复合材料IM7/CYCOM5230-1罐外固化预浸料，研究了自动铺放（AFP）罐外固化（OOA）预浸料的制备过程并优化了铺放工艺参数，采用热分析手段研究了CYCOM5230-1树脂固化动力学及黏度特性，在此基础上开发了一种短时固化工艺，并评价了基于此工艺制备的OOA复合材料力学性能。结果表明，AFP铺放过程中预浸料间缝隙会影响OOA复合材料的成型质量，采用铺放压力为180 N、加热温度为50℃、铺放速率为0.20 m/s的铺放参数，可获得表面平整、成型质量优异的复合材料样件。热分析结果表明，罐外固化CYCOM5230-1树脂室温黏度大，满足OOA工艺中真空压实排气需求。短时固化工艺可达到与典型固化工艺相同水平固化度，提升了固化效率，且制备的复合材料可以达到59%的纤维体积分数及低于0.5%的孔隙率，其力学性能与典型固化工艺制备的复合材料相当，并且能够达到热压罐复合材料的水平。

Mechanical performance of out-of-autoclave composites manufactured by automated fiber placement

Based on carbon fiber reinforced resin composites IM7/CYCOM5320-1 out-of-autoclave (OOA) prepreg, the laying process in automated fiber placement(AFP) was analyzed. The optimized process parameters in AFP were obtained. The cure kinetic and visocosity behavoir of CYCOM5230-1 resin were analyzed. A short time cure cycle was developed. Properties of OOA composite made by the developed cure cycle were evaluated. The result shows that gaps defects induced by laying process will result in voids in the final composite part. By adjusting the distance of adjacent prepreg tows, as well as the process parameters(compaction force of 180 N, heating temperature of 50℃, laying speed of 0.20 m/s), the final composite part shows an even surface and good quality. Thermal analysis reveals that CYCOM5230-1 resin has a high viscosity at room temperature, which is benefit for air evacuation in out-of-autoclave process. The short time cure cycle improves production rate. The OOA composite made by the short time cure cycle can reach the similar fiber volume fraction of 59% and porosity of 0.5%, while compared to the traditional cure cycle. In addition, the composite manufactured by the short time cure cycle has the comparable quality of autoclave composite.