铝合金加筋板轴压屈曲稳定性的有限元分析

FEM Analysis on Compress Buckling Stability of Stiffened Aluminum Alloy Panels

应用有限元软件MSC.PATRAN/NASTRAN对6种构型的T型和Z型铝合金加筋板进行了轴压屈曲临界载荷计算及屈服模态分析,并将计算结果与工程计算结果进行了比较。结果表明:在截面面积相等的情况下,适当减小筋条间距、增加筋条数目可以提高结构的屈曲失稳临界载荷;在加筋板的筋条间距与数量均相同的情况下,采用T型加筋板可以得到更高的屈曲失稳载荷;T型加筋板的一阶屈曲模态表现为筋条间蒙皮局部屈曲或加筋板总体屈曲,Z型加筋板的一阶屈曲模态均表现为筋条间蒙皮局部屈曲;有限元计算结果与工程计算结果较为吻合,与T型加筋板相比,Z型加筋板的两种计算结果偏差更小。

Finite element software MS（;. PATRAN/NASTRAN was applied to calculate compress buckling critical loads and analyse buckling modes of six types of stiffened aluminum alloy panels with T/Z-section stringers, and the results calculated by FEM were compared with semi-empirical calculation results. The results show that, with same cross section area, reducing stringer pitch or increasing stringer numbers could improve buckling critical loads. Buckling critical loads of T-stringer panels were higher than that of Z-stringer panels with the same stringer pitch and numbers. The first rank buckling mode of T-stringer panels presented local buckling of skin or general buckling of panel, while that of Z-stringer panels all presented local buckling of skin. The FEM simulation results were accordant with semi-empirical calculation results. Comparing with T-stringer panels, the errors between the two calculation results of Z-stringer panels were smaller.