摘要
通过热模压法制备碳纤维(CF)增强环氧树脂(EP)复合材料棒材,研究CF加捻工艺对复合材料棒材拉伸性能的影响。研究结果表明,适当地加捻能够有效地改善CF单丝脆性大、对应力集中敏感等缺点,提高复合材料棒材的拉伸性能。但是过度加捻使得CF排布过于紧密,树脂难以充分浸渍CF并形成良好的界面,反而使复合材料棒材的拉伸强度有所下降。因此,存在一个临界捻度值使复合材料棒材获得最优的拉伸性能。本实验中,CF的临界捻度为20捻/m,此时,复合材料棒材的拉伸强度提高了11.4%,断裂伸长率提高了9.1%,并探讨了CF加捻增强复合材料棒材拉伸性能的机理。
The carbon fiber （CF） reinforced epoxy resin （EP） composite bars were prepared by heat moulding method, the influence of CF twisting process on the tensile properties of the composite bars were researched. Appropriate twisting can effectively improve the CF monofilament brittleness, sensitive to stress concentration and other shortcomings, improve the tensile properties of the composite bars. But excessive twisting makes the arrangement of CF too closely, and resin is too difficult to fully impregnated CF and the formation of good interface, which results to the decline of the tensile strength of the composite bars. So there is a critical twist values get optimal tensile properties. In this experiment, the CF critical twist is 20 n / m, at this point, the tensile strength increases by 11.4%, the elongation at break increases by 9.1%.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2016年第2期68-72,共5页
Engineering Plastics Application
基金
上海市宝山区科学技术委员会产学研合作项目(BKW2014110)
