Analytical model of local buckling of axially compressed cylindrical shells
Analytical model of local buckling of axially compressed cylindrical shells
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DOI：
10.1016/j.tws.2021.108261
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发表时间：
2021-08-17
影响因子：
6.4
通讯作者：
Evkin, A.
中科院分区：
文献类型：
--
作者：
Evkin, A.
在过去的十年中，人们对轴压圆柱壳在不同类型的局部扰动下的屈曲进行了大量的理论和实验研究。基于有限元法的软件包被用于分析结构的行为。基于这些研究，提出了不同的方法，击倒因子和设计屈曲载荷估计。然而，数值分析可能是昂贵的和复杂的，特别是在设计阶段，当需要在各种实际约束下找到最优解时。本文作者曾提出过分析模型。它是基于Pogorelov的几何方法，这是有效的大挠度。尽管该模型很好地描述了屈曲现象的所有定性性质，但它产生了一个值得注意的误差，特别是在中等挠度范围内。本文利用数值分析的一些结果对该模型进行了改进。通过与已发表的数值和实验数据进行全面的定量比较，验证了该方法的有效性。不同的重要属性的壳屈曲和屈曲后的行为进行了研究，以证明该模型可以进行全面的调查壳的局部屈曲。基于简单的模型分析，可以选择设计屈曲载荷估计的标准。
Buckling of unstiffened axially compressed cylindrical shells under different types of local perturbations has been studied in many theoretical and experimental researches in the last decade. Software packages based on the finite element method were used for analysis of structure behavior. Different approaches, based on these studies, were suggested for knockdown factor and design buckling load estimation. However, numerical analysis may be costly and complicated especially at design stage when optimal solution should be found under variety of practical restrictions. The analytical model was suggested before by author of this paper. It was based on Pogorelov's geometrical method which is valid at large deflections. Even though the model described all qualitative properties of the buckling phenomena well, it yielded a result with noteworthy error especially at the range of moderate deflections. In the present paper the model is significantly improved by using some results of numerical analysis. It is validated by comprehensive quantitative comparison with published numerical and experimental data. Different important properties of shell buckling and post-buckling behavior are studied to demonstrate that the model allows performing a comprehensive investigation of the shell local buckling. Based on simple model analysis the criterion for design buckling load estimation can be chosen.