摘要
为了研究碳纤维增强复合材料(CFRP)层间力学性能在温度环境中的老化失效行为,设计了CFRP层间拉伸、层间剪切和弯曲实验,选取高温(80℃)、低温(-40℃)和高低温循环(-40℃~80℃)3种老化环境,分别进行0(未老化)、5、10、15、20、25、30天的老化实验,采用傅里叶变换红外光谱分析(FTIR)和差示扫描量热法(DSC),对CFRP老化前、后的化学成分变化和玻璃态转换温度(Tg)进行测试分析,并测试分析了CFRP层间失效强度随老化时间的变化规律,通过宏观断面和微观分析揭示层间性能的老化作用机理。结果表明:在高温和高低温循环老化作用下,通过FTIR发现CFRP官能团的变化趋势和程度大致相同,并且通过DSC发现CFRP老化后发生了化学键的断裂。高温和高低温循环老化后CFRP层间力学性能总体上发生了一定程度的退化,且衰减幅度比较接近,发现CFRP撕裂主要是纤维/基体界面开裂引起的,纤维发生断裂并且纤维表面比较光滑,说明老化使纤维丝与基体的界面结合力显著下降。但是,低温老化对CFRP层间性能的影响不明显。
In order to study the aging failure behavior of interlaminar mechanical properties of Carbon Fiber Reinforced Composites(CFRP)in temperature environment,interlaminar tension,interlaminar shear and bending tests of CFRP were designed. Aging tests were carried out at 0(unaged),5,10,15,20,25 and30 days at high temperature(80 ℃),low temperature(-40 ℃)and high-low temperature cycle(-40 ℃~80 ℃). Fourier Transform Infrared Spectroscopy(FTIR)and Differential Scanning Calorimetry(DSC)were used to analyze the chemical composition change and glass transition temperature,Tg,of CFRP before and after aging. The change rule of CFRP interlayer failure strength with aging time was tested and analyzed. The aging mechanism of interlayer performance was revealed through macro-section and microanalysis. The results show that under the aging at high temperature and high-low temperature cycle,the change trend and degree of functional groups of CFRP are similar,and the chemical bond breakage occurs after aging of CFRP. After aging at high temperature and high-low temperature cycle,the interlaminar mechanical properties of CFRP degrade to a certain extent and the attenuation range is close. It is found that the tearing of CFRP is mainly caused by the interfacial cracking of fibers/matrix,and the fibers are broken and the surface of the fibers is smooth,indicating that the interfacial bonding force between the fibers and the matrix is significantly reduced by aging. However,the effect of low temperature aging on the interlaminar properties of CFRP is not obvious.
作者
谭伟
那景新
任俊铭
慕文龙
TAN Wei;NA Jing-xin;REN Jun-ming;MU Wen-long(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun,1300221 China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2020年第4期1324-1332,共9页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51775230)
吉林大学研究生创新基金项目(101832018C198)。
关键词
CFRP层间力学性能
高低温老化
化学分析
失效强度
失效形式
CFRP interlaminar mechanical properties
high-low temperature aging
chemical analysis
failure strength
failure form
