| Citation: | LIU Songjing, FENG Yu, ZHANG Teng, et al. Moisture absorption performance of composite stiffened panels in hygrothermal environment[J]. Journal of Aerospace Power, 2023, 38(9):2231-2240 doi: 10.13224/j.cnki.jasp.20210724 |
In order to investigate the moisture absorption performance of composite stiffened panels in hygrothermal environment, the moisture absorption experiment of composite stiffened panels under 70 ℃ and water bath environment was carried out to analyze the law of moisture absorption, and verified by data fitting. In view of the limitations of the Fick moisture absorption model, a modified two-stage moisture absorption model considering the side moisture absorption effect was proposed. At the same time, based on the finite element method, the analysis model of the moisture absorption performance of the stiffened panels was established to simulate the diffusion and distribution of moisture in the moisture absorption process. The results showed that the saturated moisture absorption of the three experiment specimens was 0.702%, 0.696% and 0.687%, respectively, and the moisture absorption process can be divided into two stages: linear rapid moisture absorption in the early stage and lower absorption rate until equilibrium in the later stage. The accuracy of the calculation results of the model was verified by using the experimental data, and comparison with the literature proved that the model can improve the prediction accuracy. Through the finite element model, the results exhibited that the surface of the specimen reached moisture absorption equilibrium rapidly, and the thin plate area reached moisture absorption equilibrium faster than the thick plate area.
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