Moisture absorption/desorption characteristics of carbon fiber composite under hygrothermal/dry alternation environment

doi:10.19936/j.cnki.2096-8000.20220728.008

Abstract

Abstract: The moisture absorption/desorption characteristics of carbon fiber composite under hygrothermal/dry alternation environment were studied. Six times high temperature and high humidity/dry environment alternation test of composite laminates were finished. By observing the microstructure of matrix and interface, the characteristics and evolution of environmental damage were analyzed. The results show that moisture absorption diffusion coefficient increased gradually, the balanced moisture content increased, and desorption time increased significantly under hygrothermal/dry alternation environment. It shows that there are some changes in material properties and microstructure. The accuracy of fitting moisture absorption/desorption test data by polynomial was good, and the equations of multiple moisture absorption/desorption were derived according to Fick's law. The micro morphology of composite interface after the fourth and sixth moisture absorption was slightly different, which indicated that interface failure of composite basically reached "saturation". Finally, "total damage" and "residual damage" were proposed to describe the environmental damage caused by hygrothermal/dry alternation environment, which provided a new idea for damage characterization and performance prediction.

Key words: composite, hygrothermal/dry environment, diffusion coefficient, balanced moisture content, environmental damage

CLC Number:

TB332

LIN Mei, ZHANG Tie-jun, FENG Yu, WANG Qi, WU Meng-ke. Moisture absorption/desorption characteristics of carbon fiber composite under hygrothermal/dry alternation environment[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(7): 52-59.

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