Crashworthiness investigation of multi-component conical absorber with spherical cap under free inversion process: experimental study and numerical simulation

Document Type : Mechanics article

Authors

1 Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran

2 Department of Mechanical Engineering, Semnan Branch, Islamic Azad University

3 Department of mechanical engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

In this article, in order to provide energy absorption in thin-walled conical tubes under the inversion process, a new model of a multi-component conical absorber with a spherical cap is presented. For this purpose, by creating edges, a conical tube with a long length is divided into smaller components with different lengths and diameters. When the tube is subjected to axial loading, the process of deformation and dissipate of energy in this energy absorber is divided into two stages. The first stage is deformation of the spherical cap and the second stage is free inversion of each part of the conical inside next part. In other words, free inversion is formed by curling the edge of the components and then moving the tube wall downward. Therefore, the loss of energy absorption occurs with the bending of the spherical cap, the curling of the components edge and the circumferential contraction in the tube wall of each component. In this study, by using numerical simulation ABAQUS software, the effect of geometrical parameters, including cap type, number of conical components and semi-apical angle, on crashworthiness characteristics of the multi-component conical tubes are investigated. Also, in order to investigate the accuracy of the numerical simulation, some experimental tests were performed, which have obtained acceptable results. The results show that the proposed absorber model can be a suitable alternative for energy absorbers under the progressive buckling process.

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Main Subjects

References

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Journal of Modeling in Engineering
Volume 21, Issue 73
June 2023
Pages 241-253

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