摘要
碳纤维增强聚合物基复合材料(CFRP)因其耐腐蚀、轻质高强等特点被广泛应用于海洋环境,进而长期遭受湿热环境的考验。为了解湿热环境和极端温度对碳纤维增强乙烯基树脂复合材料的影响,测试了湿热老化前后和不同温度下CFRP的压缩性能、面内剪切性能和层间剪切强度变化。FTIR和SEM结果表明:纯树脂试样在湿热环境中发生了水解,使试样表面的微裂纹和孔隙不断扩展并向试样内部渗透;碳纤维的埋入抑制了水的扩散和水解,因而CFRP的吸湿曲线与Fickian模型高度吻合;纯树脂由于水解反应影响了吸湿通道使吸湿曲线偏离Fickian模型。力学性能表明:湿热老化90天后压缩强度和层间剪切强度分别降低7.6%、12.3%;试样在高温(70℃)下的压缩强度、面内剪切强度、层间剪切强度分别急剧降低36.2%、26.9%、37.4%,且高温对试样力学性能的影响具有部分可逆性。
Carbon fiber reinforced polymers(CFRP) were widely used in marine environments due to their corrosion resistance, light weight and high strength, and thus were subjected to hygrothermal environment for a long time. To understand the effects of hygrothermal environment and extreme temperatures on carbon fiber reinforced vinyl resin composites, the changes of compression properties, in-plane shear properties and interlaminar shear strength of CFRP before and after hygrothermal aging and at different testing temperatures were determined. The results of Fourier transform infrared spectroscopy(FTIR) and scanning electron microscope(SEM) show that the pure resin specimens undergo hydrolysis in the hygrothermal environment, which cause the microcracks and pores on the surfaces of the specimens to expand and penetrate into the interior of the specimens. The moisture absorption curve of CFRP is in high agreement with Fickian model, while the moisture absorption curve of pure resin deviated from Fickian model because the hydrolysis reaction affected the moisture absorption channels. Meanwhile,the measurement on mechanical properties reveals that the compressive strength and interlaminar shear strength decrease by 7.6% and 12.3%, respectively, after hygrothermal aging for 90 days, and the compressive strength, inplane shear strength, and interlaminar shear strength of the specimens at elevated temperature(70℃) decrease sharply by 36.2%, 26.9% and 37.4%, respectively. Meanwhile, it can be concluded that the effect of elevated temperature on the mechanical properties of the specimens is partially reversible.
作者
张裕恒
王继辉
魏建辉
刘明
李旭
丁安心
ZHANG Yuheng;WANG Jihui;WEI Jianhui;LIU Ming;LI Xu;DING Anxin(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan Second Ship Design and Research Institute,Wuhan 430061,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第3期1406-1416,共11页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(11902231)。
关键词
碳纤维增强复合材料
乙烯基树脂
湿热老化
吸湿
力学性能
carbon fiber reinforced polymers
vinylester resin
hygrothermal aging
moisture absorption
mechanical properties
作者简介
通讯作者:魏建辉,博士,高级工程师,研究方向为舰船结构的设计与分析,E-mail:344971720@qq.com;通讯作者:丁安心,博士,教授,硕士生导师,研究方向为高分子和复合材料结构固化成型仿真与监测、结构设计和老化评价,E-mail:axding@whut.edu.cn。
