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- 2018
轧制制备碳纤维/环氧树脂复合材料层合板及其成形性能
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Abstract:
为研究碳纤维/树脂复合材料预浸料轧制制备层合板的可行性及成形性能，基于不同轧制工艺和固化方案制备了碳纤维/环氧树脂复合材料层合板，结合三点弯曲试验和冲压试验，分析了层合板弯曲性能和温热冲压性能，观察了试样断面显微组织，并与热压罐工艺对比。结果表明，经80℃预固化-轧制-后固化工艺所得层合板综合性能优于轧制-固化和固化-轧制工艺，在压下量为0.4 mm条件下，层合板最大弯曲强度和弯曲模量较自然固化试样分别提高了23.8%和17.4%，且弯曲强度和弯曲模量均高于热压罐工艺试样。冲压过程中轧制压下量和预热温度对试样成形性影响显著，合理的压下量可提高层合板成形性，升高温度有利于试样成形，但温度过高致使试样破坏加剧皱曲增多，主要破坏区域为试样底部冲头半径轮廓，皱曲沿经纬方向与纤维成45°夹角区域明显。轧制工艺的差异对层间内部结合影响显著，较自然固化试样相比，轧制后复合材料力学性能有所改善，为碳纤维增强树脂基复合材料与金属材料轧制复合提供参考。 In order to study the feasibility and formability of the carbon fiber/epoxy composite laminates by rolling proces, it was prepared based on different process and curing scheme. The bending performance and the hot stamping properties of the laminate were analyzed by the three point bending test and stamping experiment. The microstructure of the sample section was observed. Finally, it was compared with the autoclave process. The results show that the comprehensive performance of the laminate obtained by 80℃ pre-curing-rolling-post-curing process is better than those of rolling-curing and curing-rolling process. Under the condition of reduction 0.4 mm, the maximum bending strength and modulus of the laminate increase by 23.8% and 17.4%, respectively, than that of the natural curing samples. Furthermore, the bending strength and modulus are higher than those of the autoclave process. On the stamping process, the reduction and preheating temperature have a significant effect on the forming of the sample. The reasonable reduction can improve the formability and elevated temperature is favorable for the sample formation, however, the higher temperature results in destruction of the specimen and the wrinkle increasing. The main damage area is the punch radius profile at the bottom of the sample, wrinkling along the latitude and longitude direction with fiber into a 45° angle area obvious. The difference of the process has a significant effect on the interlayer combination. Compared with the natural curing, the mechanical properties of the composites are improved after rolling. It provides reference for the recombination of carbon fiber reinforced plastic composite with metal material by rolling process. 留学人员科技活动择优资助项目（CG2016003001）
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