制备了CCF300碳纤维/BA9916-II环氧树脂复合材料加筋壁板,研究了该加筋壁板在干态和湿热状态下的压缩行为;建立加筋壁板有限元模型,使用经验公式对湿热环境下的材料参数进行修正,通过模拟分析了不同状态加筋壁板的压缩屈曲与后屈曲行为,并进行了试验验证。结果表明:加筋壁板在干态与吸湿状态下均有较强的后屈曲承载能力;湿热环境会对加筋壁板稳定性与承载能力造成较大负面影响,随吸湿时间延长,其屈曲及破坏载荷均呈先快后慢的下降趋势;模拟得到干态加筋壁板的屈曲载荷和破坏载荷与试验结果的相对误差分别为3.1%和5.2%,吸湿饱和态下的相对误差分别为5.6%和6.9%,误差较小,证明了所采用模拟方法的准确性和所建立有限元模型的合理性。

The stiffened panels of CCF300 carbon fiber/BA9916-II epoxy resin composite were prepared. The compression behavior of the stiffened panel under dry and hygrothermal conditions was studied. The finite element model of the stiffened panel was established, and the material parameters in the hygrothermal environment were modified by the empirical formula. The compressive buckling and post-buckling behavior of the stiffened panel in different states were simulated and verified by experiments. The results show that the stiffened panel had strong post-buckling bearing capacity in both dry and hygrothermal states. The hygrothermal environment had a great negative effect on the stability and carrying capacity of the stiffened panel. With increasing moisture absorption time, the buckling and failure loads of the stiffened panel decreased fast and then slowly. The relative errors between the simulation and test resuls of buckling load and failure load of the stiffened panel in the dry state were 3.1% and 5.2%, and in the moisture saturation state were 5.6% and 6.9%, respectively. The errors were small, proving the accuracy of the simulation method and the reasonableness of the finite element model.