高低温循环-湿度-荷载耦合作用对碳纤维/环氧树脂复合材料拉伸性能的影响  

Coupling effect of high and low temperature cycle-humidity-load on tensile properties of carbon fiber/epoxy composites

作　　者：石建军[1,2] 任银银 贾彬 刘曹锐[1] 张佳贺 SHI Jianjun;REN Yinyin;JIA Bin;LIU Caorui;ZHANG Jiahe(College of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China;Key Laboratory of Icing and Anti/De-icing of Aircraft,China Aerodynamics Research and Development Center,Mianyang 621000,Sichuan,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：《航空材料学报》2022年第6期97-106,共10页Journal of Aeronautical Materials

基　　金：结冰与防除冰重点实验室开放课题(IADL20190402);四川省自然科学基金(2022NSFSC0317)。

摘　　要：研究环氧树脂基碳纤维增强复合材料(EP-CFRP)在荷载及恶劣环境共同作用下的耐久性能。环境因素为-40~40℃/-40~25℃2种区间的高低温循环以及湿度(有水浸泡及无水)的影响,荷载为极限荷载的30%和60%。结果表明:“高低温循环-湿度”双因素耦合作用后及“高低温循环-湿度-荷载”三因素耦合作用对EPCFRP的耐久性影响较大,拉伸强度随高低温循环周期的增加整体呈现先降低再升高再降低的变化趋势,但是峰谷值出现的时间周期相差较大;湿度和荷载水平对EP-CFRP的拉伸模量影响较小;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后期强度降低的主要原因;湿度-荷载的耦合作用促进裂纹的扩展,加剧了EP-CFRP的损伤。根据损伤分析,采用非线性拟合的方法给出了“高低温循环-湿度-荷载”三因素耦合作用后EP-CFRP的剩余强度损伤模型。This paper studies the durability of epoxy resin-based-carbon fiber reinforced polymer(EP-CFRP) under the combined action of aggressive environmental conditions and load.Environmental conditions such as high and low temperature cycles of-40-40 ℃/-40-25 ℃ and humidity(water immersion and no water) are investigated in an unstressed state or loaded in about 30% or60% of the initial ultimate load.The results indicate that both of the dual-factor coupling of “high and low temperature cyclehumidity” and the three-factor coupling of “ high and low temperature cycle-humidity-load” have a greater impact on the durability of EP-CFRP.The tensile strength varies with the cycle of high and low temperature.The overall increase shows a simulated trend of first decreasing,then increasing,and then decreasing;however,the appearance of the peak and valley values are quite different.Humidity and load level have little effect on the tensile modulus of EP-CFRP The microcracks generated at the interface between the resin matrix and the fiber have been proved to be the main reason for the strength reduction at later stage.The coupling effect of humidity and load promotes the expansion of cracks and exacerbates the damage to EP-CFRP.According to the damage analysis,a non-linear fitting method is used to give the residual strength damage model of EP-CFRP after the coupling action of the three factors “high and low temperature cycle-humidity-load”.

关 键 词：CFRP 高低温循环 湿度 拉伸性能 剩余强度模型 

分 类 号：TB332[一般工业技术—材料科学与工程]