In the current study, plastic buckling and postbuckling behavior of aluminum alloy plates under uniaxial, biaxial and combined compressive/shear loadings using 3D standard and incompatible elements are investigated. In this study, the finite element code considering geometrically and material nonlinearities is developed based on the incremental theory of plasticity. Obtained results show that the bifurcation point and postbuckling behavior in the models with linear standard elements have significant differences in models with incompatible and quadratic elements at the same mesh size. Furthermore, the buckling and postbuckling analysis using incompatible elements have faster convergence rate compared to linear and quadratic elements.

中文翻译：

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使用 3D 不兼容和标准元素对板进行塑性屈曲和后屈曲分析

在当前的研究中，使用 3D 标准和不相容元素研究了铝合金板在单轴、双轴和组合压缩/剪切载荷下的塑性屈曲和后屈曲行为。在这项研究中，基于塑性增量理论开发了考虑几何和材料非线性的有限元代码。得到的结果表明，在相同网格尺寸下，具有线性标准单元的模型中的分岔点和后屈曲行为在具有不相容和二次单元的模型中存在显着差异。此外，与线性和二次单元相比，使用不兼容单元的屈曲和后屈曲分析具有更快的收敛速度。