Postbuckling of Imperfect Stiffened Cylindrical Shells under Combined External Pressure and Heating
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摘要: 基于壳体屈曲的边界层理论,本文给出有限长加筋圆柱壳在侧向外压和均布热荷载共同作用下的后屈曲分析。分析中同时考虑壳体非线性前屈曲变形,大挠度和初始几何缺陷的影响。肋条的处理采用“平均刚度”法。采用奇异摄动方法导得壳体屈曲载荷关系曲线和后屈曲平衡路径,并给出完善和非完善,纵向加筋或环向加筋圆柱壳数值算例。Abstract: A postbuckling analysis is presented for a stiffened cylindrical shell of finite length subjected to combined loading of external pressure and a uniform temperature rise.The formulations are based on a boundary layer theory of shell buckling,which includes the effects of nonlinear prebuckling deformations,nonlinear large deflections in the postbuckling range and initial geometrical imperfections of the shell.The "smeared stiffener" approach is adopted for the stiffeners.The analysis uses a singular perturbation technique to determine the interactive buckling loads and the postbuckling equilibrium paths.Numerical examples cover the performances of perfect and imperfect,stringer and ring stiffened cylindrical shells.Typical results are presented in dimensionless graphical form.
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