摘要
通过对炭纤维增强复合材料进行70、85、100℃下的循环水浸吸湿试验,研究了复合材料在不同水浸温度下的吸湿-脱湿行为规律。同时,对循环吸湿-脱湿过程中的试样进行层间剪切强度测试和动态力学性能测试,并结合扫描电镜观察循环吸湿各个阶段的纤维基体结合状态。结果表明,水浸温度越高,水分的扩散速率越快,饱和吸湿率越大。经过循环吸湿后复合材料的吸湿行为仍满足Fick第二定律,吸湿后层间剪切强度下降,湿热循环次数越多下降的越明显。脱湿后层间剪切强度有所恢复,水浸温度越高造成的不可逆破坏越大,层间剪切强度恢复的越少。干态时的玻璃化转变温度为231℃,吸湿后下降了37℃。
Circulating water leaching moisture absorption test in 70,85 and 100 ℃ on woven carbon fiber epoxy resin composite was carried out to analyze moisture absorption and desorption behaviors under different water temperatures.Meanwhile,the interlaminar shear strength and dynamic mechanical properties tests for the sample in the process of circulation hygroscopic were conducted.Combined with a Scanning Electron Microscope （SEM） technique,the fiber matrix junction status of various stages after hygroscopic damage was observed.The results show that the higher the water temperature is,the faster its diffusion rate is,and the greater the saturated moisture absorption rate is.After circulating moisture absorption,moisture absorption behavior of the composite materials still satisfy the Fick＇s second law,and inter laminar shear strength decreases after moisture absorption,and the more heat cycle goes,the more obvious inter laminar shear strength decreases.Inter laminar shear strength recover after dehumidifying.The higher the temperature is,the greater the irreversible damage caused by the water temperature is,resulting in the less recovery of inter laminar shear strength.The glass transition temperature of dry state is 231 ℃,and decreased 37 ℃ after moisture absorption.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2017年第5期639-647,共9页
Journal of Solid Rocket Technology
基金
辽宁省教育厅项目(L201611)
关键词
炭纤维环氧复合材料
吸湿-脱湿行为
层间剪切强度
动态力学性能
carbon fiber reinforced composites
moisture absorption and desorption behavior
inter laminar shear strength
dy-namic mechanical property
