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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Buckling and vibration of composite lattice elliptical cylindrical shells
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Buckling and vibration of composite lattice elliptical cylindrical shells

机译：复合格子椭圆形圆柱壳的屈曲和振动

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摘要

An approach to the finite element study of the buckling and dynamic behaviour of composite lattice cylindrical shells with elliptical cross sections is presented in this paper. The lattice shells are modelled as three-dimensional frame structures composed of curvilinear ribs using beam finite elements. A specialised algorithm is developed to generate the finite element model of the lattice shells based on multiple use of the repeating unit cell of the composite lattice structure. Using this model, the buckling behaviour of the shells subjected to axial loading and transverse bending are investigated. Fundamental frequencies of axial and transverse vibrations of the shells with a massive rigid disk attached to their ends are determined based on the modelling approach proposed in this work. The effects of parameters of the lattice structure on the values of critical buckling loads, buckling and vibration mode shapes, and the fundamental frequencies are examined using parametric analyses. Based on the computations, the angles of orientation of helical ribs delivering maximum critical loads and fundamental frequencies are identified. The results of this study can be applied to the design of the composite tubular bodies of spacecraft made in the form of cylindrical lattice shells with elliptical cross sections.
机译：本文介绍了一种具有椭圆形横截面的复合晶格圆柱形壳的屈曲和动态行为的有限元研究的方法。晶格壳被建模为使用梁有限元件由曲线肋组成的三维框架结构。开发了一种专用算法，基于复合晶格结构的重复单元电池的多次使用来产生晶格壳的有限元模型。使用该模型，研究了经受轴向加载和横向弯曲的壳体的屈曲行为。基于该工作中提出的建模方法确定具有附接到其端部的壳体的轴向和横向振动的基本频率。使用参数分析检查晶格结构参数对关键屈曲负荷，屈曲和振动模式形状的值的影响，以及基本频率。基于计算，识别提供最大临界载荷和基本频率的螺旋肋的取向的角度。该研究的结果可以应用于具有椭圆形横截面的圆柱形晶格壳形式的航天器的复合管状体的设计。

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