Shear-buckling of omega-stringer-stiffened panels
Shear-buckling of omega-stringer-stiffened panels
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DOI：
10.1016/j.ijmecsci.2021.106646
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发表时间：
2021-07
影响因子：
7.3
通讯作者：
J. Schilling;C. Mittelstedt
中科院分区：
文献类型：
--
作者：
J. Schilling;C. Mittelstedt
提出了一种新的近似解析计算模型，分析了欧米格筋加筋板的局部剪切屈曲性能。这种类型的稳定性分析对于薄壁结构是至关重要的，比如建议的面板，它主要应用于航空航天结构和船舶等。在这种情况下，计算效率高的方法对于通常涉及优化和广泛的参数研究的初步设计阶段尤其必要。本文建立了考虑弯扭耦合和不同加载方向的剪屈曲临界荷载的简化分析模型，并对其进行了计算。该建模方法以能量法为基础，采用总弹性势的定值原理。因此，屈曲形函数是基于多项式项和三角Timoshenko项的组合，其中后者通常用于闭合形式的剪切屈曲分析。通过与有限元分析的比较，对四种不同的层合板结构和不同的面板尺寸范围内的近似计算模型进行了评估。参数研究产生了令人满意的结果，在初步设计的情况下误差是非常可以接受的。
The local shear-buckling behaviour of omega-stringer-stiffened composite panels is analysed introducing a novel approximate analytical computational model. This type of stability analysis is critical for thin-walled structures like the proposed panel, which is applied, among other things, mainly in aerospace structures and marine vessels. In this context, computationally efficient methods are especially necessary for preliminary design phases that often involve optimization and extensive parameter studies. In the present work, a simple analytical model for the critical shear-buckling load is developed and evaluated taking bending-twisting coupling and different load directions into account. The modelling approach is based on energy methods and employs the principle of the stationary value of the total elastic potential. Hereby, the buckling shape functions are based on a combination of a polynomial term and a trigonometric Timoshenko-type term, where the latter is commonly used for closed-form analytical shear-buckling analysis. The approximate computational model is evaluated for four different laminate configurations and a wide range of different panel dimensions in comparison to finite element analyses. The parameter studies yield promising results with errors very acceptable in the context of preliminary design.