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针对两种不同上浆剂碳纤维/高温固化环氧树脂体系,采用基于WND(Wagner-Nairn-Detassis)能量模型的单丝断裂法,测试分析了从室温到130℃范围内单丝复合体系界面断裂能的变化规律,研究了碳纤维上浆剂对界面耐热性能的影响,并结合复合材料层板的短梁剪切性能,分析了微观和宏观界面性能的关联性。结果表明:在测试温度范围内,碳纤维/环氧体系的界面断裂能随温度升高呈先下降而后基本不变的趋势,去除上浆剂后界面断裂能及其随温度的变化程度与未去除上浆剂的情况存在差异,说明上浆剂对界面耐热性有重要作用。碳纤维/环氧树脂层板层间剪切强度随温度升高线性下降,与界面断裂能的变化规律不一致,这与两种测试方法的原理及界面破坏位置的不同有关。
In this paper, the monofilament breaking method based on WND (Wagner-Nairn-Detassis) energy model was applied to the two different sizing agent carbon fiber / high temperature curing epoxy systems. The interfacial fracture energy The influence of carbon fiber sizing agent on the heat resistance of the interface was studied. Combining the short beam shear properties of the composite material plate, the correlation between the micro and macro interface properties was analyzed. The results show that the interfacial rupture energy of carbon fiber / epoxy system first decreases and then changes basically unchanged in the test temperature range. The interfacial rupture energy and its change with temperature after removing the sizing agent are similar to those without sizing agent The situation is different, indicating sizing agent on the interface has an important role in heat resistance. The interlaminar shear strength of carbon fiber / epoxy laminates decreases linearly with temperature, which is not consistent with the change of interfacial fracture energy, which is related to the principle of two test methods and the different location of interfacial failure.