Buckling and postbuckling of advanced grid stiffened truncated conical shells with laminated composite skins
Buckling and postbuckling of advanced grid stiffened truncated conical shells with laminated composite skins
复制标题
层合复合蒙皮先进网格加劲截锥壳的屈曲和后屈曲
DOI：
10.1016/j.tws.2019.106528
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发表时间：
2020
影响因子：
6.4
通讯作者：
M. Noghabi
中科院分区：
文献类型：
--
作者：
Mehdi Bohlooly;M. A. Kouchakzadeh;B. Mirzavand;M. Noghabi
提出了一种理论方法来推导先进网格加劲锥形壳（具有层压复合材料蒙皮的加劲件）的屈曲载荷和屈曲后路径的显式公式。考虑了不同类型的网格纤维路径，包括纵梁、环形和螺旋。具有缺陷的简支截锥壳受到轴向压缩。使用经典的壳理论和冯卡门类型的非线性应变-位移关系构建基本公式。通过伽辽金程序求解平衡方程和相容方程，并获得显式关系来预测平衡路径。通过与文献中现有数据的比较来验证不同条件下的结果。参数研究揭示了新的结果，以显示不同纤维路径、几何条件和叠层配置对先进网格加固结构的屈曲和后屈曲的影响。作为一个重要发现，网格的螺旋纤维和环形纤维在屈曲载荷和屈曲后路径上比纵梁更有效。特别是当考虑到大量肋骨时。
A theoretical approach is presented to derive an explicit formula for buckling load and postbuckling path of advanced grid stiffened conical shells (stiffeners with laminated composite skins). Different types of fiber paths of grids including stringer, ring, and helical are considered. The simply supported truncated conical shell with imperfection is subjected to axial compression. Basic formulations are constructed using the classical theory of shells and von Karman type of nonlinear strain-displacement relationships. The equilibrium and compatibility equations are solved by Galerkin procedure, and an explicit relation is obtained to predict the equilibrium paths. Results for different conditions are verified by comparison to existing data in the literature. Novel results are revealed in the parametric study to show the effects of different fiber paths, geometrical conditions, and lay-up configurations on the buckling and postbuckling of the advanced grid stiffened structures. As a key finding, the helical and ring fibers of grids are more effective than stringer on the buckling load and postbuckling path. Especially when high number of ribs are considered.