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Reduced-order modeling analysis of shell structures buckling using a co-rotational solid-shell element

机译：使用同向旋转固体单元的壳结构屈曲的降阶建模分析

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The solid-shell elements can simplify the modeling process of the three-dimensional thin-walled structures that are commonly used in aerospace engineering. In this work, an efficient locking-free 8-node solid-shell element, termed SolSh8, is developed for geometrically nonlinear buckling analysis of shell structures. The solid-shell element is developed based on the conventional brick solid element with only translational degrees of freedom. The Assumed Natural Strain (ANS) method and the Enhanced Assumed strain (EAS) method are used to improve the linear performance of the element formulation. The proposed element is implemented into the co-rotational formulation of the Koiter-Newton method. The geometrically nonlinear equilibrium path of the structure can be traced efficiently benefiting from the reduced order model used in the Koiter-Newton method. Numerical examples demonstrate the excellent performance of the proposed method. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：固体壳单元可以简化航空工程中常用的三维薄壁结构的建模过程。在这项工作中，开发了一种称为SolS8的高效无锁8节点固体壳体单元，用于壳体结构的几何非线性屈曲分析。实心壳单元是基于常规砖实心单元而开发的，仅具有平移自由度。假定自然应变（ANS）方法和增强假定应变（EAS）方法用于改善元素配方的线性性能。拟议的元素被实现到Koiter-Newton方法的同向旋转公式中。得益于Koiter-Newton方法中使用的降阶模型，可以有效地跟踪结构的几何非线性平衡路径。数值算例表明了该方法的优越性能。 （C）2017 Elsevier Masson SAS。版权所有。

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