海洋环境下G814/3233复合材料的老化机理及加速老化与自然老化的相关性

doi:10.7527/S1000-6893.2020.24260

Abstract

Abstract: To explore the aging mechanism and the correlation between laboratory accelerated aging environments and real service environments of Carbon Fiber Reinforced Plastics (CFRP) for aviation, the G814/3233 composite commonly used in aircraft and the marine environment are taken as the research object and the service background, respectively. Laboratory accelerated aging tests and natural exposure tests on board were conducted, and the mechanical properties, microstructure and structural composition of the specimen before and after aging were observed. The traditional large sample statistical method was improved, the small sample method for natural aging equation determination proposed, and the data sample effectively expanded. The equivalent conversion coefficient calculation method based on the longitudinal-transverse shear strength retention rate was proposed, and the relevant verification test was carried out. The results show that the surface resin and the carbon fiber/resin interface of G814/3233 composite are destroyed after accelerated aging for one month. The residual strength, shear strength and glass transition temperature decrease by 6.93%, 7.30% and 0.87%, respectively. The storage modulus increases by about 5 GPa at room temperature. The aging mechanism and the median curve of longitudinal-transverse shear strength of this type of CFRP in marine environments were obtained. The equivalent conversion coefficient between the natural aging environment and the accelerated aging environment is 7.25. The laboratory accelerated aging method established in this paper has good acceleration, simulation and reproducibility for the natural aging.

Key words: marine environment, CFRP, natural aging, accelerated aging, equivalent conversion coefficient

CLC Number:

V258⁺.3

WANG Andong, BIAN Guixue, ZHANG Yong, CHEN Yueliang, ZHANG Zhuzhu, ZHANG Yangguang. Aging mechanism of G814/3233 composite in marine environment and correlation between accelerated aging and natural aging[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(5): 524260-524260.

References 21

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Aging mechanism of G814/3233 composite in marine environment and correlation between accelerated aging and natural aging

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