| Citation: | TANG Yinsen, CHENG Hanlin, ZHOU Biao, et al. Dynamic characteristics of 2.5D woven resin-based composite plates in the hygrothermal environment[J]. Journal of Aerospace Power, 2026, 41（2）：20230547 doi: 10.13224/j.cnki.jasp.20230547
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A study on the dynamic testing, analysis and model updating of 2.5D woven resin-based composite plates in the hygrothermal environment was carried out. Firstly, modal tests for the free-free composite plates in the hygrothermal environment were conducted. Secondly, a modal analysis method of composite structures in the hygrothermal environment was specifically developed by taking advantage of a predictive model of the degrading mechanical properties of the fiber/resin matrix materials. Finally, the dynamic model of the composite plate in the hygrothermal environment was updated by exploiting the modal test data. The test results clearly revealed the impact of the temperature and humidity on the natural vibration characteristics of the free composite plates. The proposed modal vibration analysis method was proved to be able to effectively predict the evolving trend of the free composite plate’s frequencies in the hygrothermal environment. After key elastic parameters were updated, the consistency between the tested/predicted natural frequencies of the first 6 modes of the free composite plates was significantly improved. The maximum frequency error decreased from 12.21% to 2.4%. Meanwhile, the equivalent elastic parameters of the composite material in the hygrothermal environment, including the shear modulus, were experimentally derived.
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