摘要
研究了环氧树脂基碳纤维增强复合材料(EP‑CFRP)在高低温‑湿度‑拉伸载荷耦合作用下的损伤情况。考虑了两个高低温循环间隔([-40~40℃]/[-40~25℃])、两种湿度条件(浸泡在水中/无水)和3个荷载水平(无荷载/30%极限荷载/60%极限荷载)以及它们之间的耦合效应。结果表明,这3个因素对EP‑CFRP的耐久性均有显著影响。这些因素的耦合效应对抗拉强度的影响较大,而对拉伸模量的影响较小。树脂基体与纤维界面产生的微裂纹被证明是后期强度降低的主要原因。湿度和拉伸载荷的耦合效应促进了裂纹的膨胀,加剧了对EP‑CFRP的损伤。基于累积损伤理论,采用非线性拟合方法标定了EP‑CFRP在3因素耦合作用下的剩余强度损伤模型。
The paper studies the damage of epoxy resin-based carbon fiber reinforced ploymer(EP-CFRP)under the coupling effects of high and low temperature,humidity,tensile load.Two high and low temperature cycle intervals([-40-40℃]/[-40-25℃]),two humidity conditions(soaking in water/anhydrous),and three load levels(unstressed state/30%and 60%of the ultimate load)and their coupling effects are considered.The results indicate that all these three factors have a significant impact on the durability of EP-CFRP.The coupling effects of these factors have strong influence on the tensile strength,while affect little on the tensile modulus.The micro-cracks,which generated at the interface of 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 tensile load promote the expansion of cracks and exacerbates the damage to EP-CFRP.Based on the cumulative damage theory,the residual strength damage model of EP-CFRP under the three-factor coupling action of“high and low temperature cycle-humidity-load”is calibrated by nonlinear fitting method.
作者
石建军
王文泽
魏王程
刘一凡
SHI Jianjun;WANG Wenze;WEI Wangcheng;LIU Yifan(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,P.R.China)
基金
supported by the Natural Science Foundation of Sichuan Province(No.2022NSFSC0317)
Key Laboratory of Icing and Anti/De-icing of Aircraft Project(No.IADL20190404)。
关键词
碳纤维增强复合材料
高低温循环
湿度
拉伸性能
剩余强度模型
carbon fiber reinforced polymer(CFRP)
high and low temperature cycle
humidity
tensile properties
residual strength model
