高低温循环及湿度耦合作用对环氧树脂基碳纤维增强复合材料拉伸性能的影响  

Effect of High and Low Temperature Cycle and Humidity Coupling on the Tensile Properties of Epoxy Carbon Fiber Reinforced Composites

作　　者：任银银 石建军[1,2] 贾彬 刘曹锐[1] 张佳贺 李朗 REN Yinyin;SHI Jianjun;JIA Bin;LIU Caorui;ZHANG Jiahe;LI Lang(College of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Icing and Anti/De-Icingt,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]中国空气动力研究与发展中心,结冰与防除冰重点实验室,四川绵阳621000

出　　处：《塑料工业》2022年第4期128-134,共7页China Plastics Industry

基　　金：结冰与防除冰重点实验室开放课题(IADL20190402);飞行器结冰与防除冰重点实验室开放课题资助(ALADL20180103);四川省科技厅项目(2020YFG0183,2020JDTD0021)。

摘　　要：研究了环氧树脂基碳纤维增强复合材料在高低温循环(-40~40℃/-40~25℃)及湿度(有水、无水)两种环境因素耦合作用下的拉伸性能变化规律以及界面损伤机理,循环实验包括0,5,10,100,200,300周期,结合拉伸强度测试、吸湿实验及扫描电镜(SEM)分析。结果表明,不管在有水还是无水的环境下,环氧树脂基碳纤维增强复合材料的拉伸强度随高低温循环周期增大整体呈现先降低再升高再降低的变化趋势;高低温循环5周期时开裂最严重,拉伸强度到达谷点,随着循环次数的增多直至100周期左右,材料的拉伸强度达到峰值,随后下降;拉伸模量影响不大;树脂基体与纤维界面产生的微裂纹被证明是导致复合材料强度降低的主要原因;湿度的耦合作用促进裂纹的扩展,明显削弱了环氧树脂基碳纤维增强复合材料的拉伸性能。The tensile properties and interfacial damage mechanism of epoxy resin-based carbon fiber reinforced composites were studied under the coupling action of high and low-temperature cycling(-40~40℃/-40~25℃)and humidity(with and without water).The cycle experiment includes 0,5,10,100,200,300 cycles,combining with tensile strength test,water absorption experiment,and scanning electron microscope(SEM).The results show that the tensile strength of the resin-based carbon fiber composites decreases then increases and then decreases with the increase of high and low-temperature cycles,regardless of the environment with or without water temperature cycle.The cracking is the most serious at 5 cycles of the high and low-temperature cycle,and the tensile strength could reach the nadir.As the increase of cycle numbers to achieve 100,the tensile strength of material could achieve the peak value and then decreases.There is little effect on the tensile modulus.The microcracks at the interface between the resin matrix and the fiber have shown to be the main cause of the decreasing of composites strength.The coupling effect of humidity promotes the expansion of cracks and significantly weakens the tensile properties of the resin-based carbon fiber composite.

关 键 词：碳纤维增强复合材料 高低温循环作用 湿度 拉伸性能 吸水性 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]