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Defang Zhao,Lichao Yu,Weiwei Guo,Xu Meng,Yinjiang Zhang,Haihua Zhan,Jianhan Hong,Huaizhong Xu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
This paper reports a detailed study on the long-term mechanical and dynamic mechanical performance of carbonfiber (CF) plain-woven fabric-reinforced epoxy (CF/epoxy) laminates fabricated by the hot-compression molding technique. Water-sorption experiments, mechanical property tests, and dynamic mechanical analysis (DMA) tests were performed afterimmersion in de-ionized water at different temperatures (i.e., 25 oC, 60 oC, and 80 oC) for times up to 120 days. The resultsshow that weight-gain curves for the composites at elevated temperature (i.e., 80 oC) fit the theoretical Fickian diffusion curveduring the initial immersion time, but deviate substantially as time prolongs. The flexural properties and dynamic mechanicalproperties are highly susceptible to the effects of the hygrothermal environment, and the performance for both degrade withincreasing exposure temperatures and durations. The dynamic mechanical properties partly recover after the dryingtreatment, which is caused by the irreversible degradation in the interfacial region (i.e., fiber/matrix debonding) as evidencedby morphological images from scanning electron microscopy (SEM). Finally, the long-term degradation of the compositeswas estimated and the service life of the materials was also predicted using the Arrhenius degradation theory. The outputs ofthe research show that CF/epoxy laminates have flexural strength retention of 60 % for more than 2 years at the annualtemperature of Kyoto.