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First applications of a novel unified model for global and local buckling of sandwich columns

机译:一种新颖的统一模型在三明治柱整体和局部屈曲中的首次应用

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摘要

Due to the intrinsic heterogeneity of sandwich structures, phenomena at various scales can co-exist in these layered-like assembly of thick-soft and thin-stiff materials. Especially under in-plane compression loadings, geometrical instabilities can occur at both global(structure) and local (skins) scales. Therefore, the in-plane compressive response of sandwich structures is of major concern in designing structural applications. In the present paper, the first applications of a novel unified model for sandwiches are presented, with closed-form solutions for both global and local buckling. For the perfect structure, analytical critical loads are extracted for a simply supported beam, through the calculation of two eigenvalues leading to three buckling modes: it appears that the eigenvalue associated with the antisymmetrical mode can correspond to the occurrence of either global or local(wrinkling) buckling. These global and local loads from the present unified model are shown to compare very well with the predictions given by the most complete specific models from the literature.
机译:由于夹层结构固有的异质性,在厚软硬薄的层状组装中,各种规模的现象可以共存。尤其是在平面压缩载荷下,几何不稳定性可能同时在整体(结构)和局部(皮肤)尺度上发生。因此,夹层结构的面内压缩响应是设计结构应用中的主要问题。在本文中,提出了一种新颖的三明治统一模型的首次应用,并为全局和局部屈曲提供了封闭形式的解决方案。对于理想的结构,通过计算导致三个屈曲模式的两个特征值,提取了简单支撑梁的分析临界载荷:与反对称模式相关的特征值似乎可以对应于整体或局部(起皱)的出现)屈曲。显示了来自当前统一模型的这些全局和局部载荷与文献中最完整的特定模型给出的预测进行了很好的比较。

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