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凸台连接对整体加筋壁板的稳定性有重要影响,但其存在性也相应增加了有限元建模和分析的难度。针对此类整体加筋壁板结构,根据面积等效方法提出一种新的有限元建模方法预测临界屈曲载荷,该模型简化了网格生成步骤,便于建模分析,并考虑材料非线性和几何非线性,分析结构的后屈曲行为。通过与轴压状态整体加筋壁板的稳定性试验结果对比,验证了新模型的准确性,并探讨了蒙皮厚度和初始缺陷对结构屈曲的影响,为工程稳定性分析及结构设计提供参考。
The connection of bosses has an important influence on the stability of the whole stiffened panel, but its existence also increases the difficulty of finite element modeling and analysis. A new finite element modeling method based on area equivalent method is proposed to predict the critical buckling load. The model simplifies the mesh generation step, facilitates the modeling and analysis, and considers the material nonlinearity and Geometric nonlinearity, post-buckling behavior analysis of the structure. The accuracy of the new model is verified by comparison with the results of the stability test of the stiffened panel under axial compression. The influences of the skin thickness and the initial defect on the buckling of the structure are discussed, which can provide references for the stability analysis and structural design .