Crush behaviour of foam-filled thin-walled conical frusta: analytical, numerical and experimental studies

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• 作者：S. A. Meguid ; F. Yang ; P. Hou
• 刊名：Acta Mechanica
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：227
• 期：12
• 页码：3391-3406
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics; Classical and Continuum Physics; Continuum Mechanics and Mechanics of Materials; Structural Mechanics; Vibration, Dynamical Systems, Control; Engineering Thermodynam
• 出版者：Springer Vienna
• ISSN：1619-6937
• 卷排序：227

文摘

This paper is concerned with a detailed study of the crush behaviour of foam-filled conical frusta using numerical, analytical and experimental techniques. Finite element models of thin-walled frusta with and without metallic foam filler are developed to simulate their progressive collapse behaviour under axial crush loads. The finite element results are compared with a kinematically admissible analytical model developed earlier by the authors as well as experimentally using crush tests. The effect of key design parameters such as taper angle, slenderness ratio, and foam filling are carefully examined and discussed. The results show that introducing a taper angle in a straight column helps to reduce the initial crippling load and increases the resistance to global buckling. Besides, the filling of the metallic foam further increases the specific energy absorption efficiency. This is due to the densification of the filler foam and the reduction of the plastic fold length. This work is intended to provide guidelines for the design of thin-walled metallic energy absorbers.