Abstract
Among the energy absorbers, thin-walled tubes can play an essential role in reducing the load on the main structure and protecting the occupants. Therefore, in this article an attempt has been made to improve the performance of spherical-capped circular tubes by using inversion mechanism. To do so, by creating edges on the circular tube, a multi-component tube is formed with different lengths and diameters. When the multi-component tube is subjected to an axial load, the spherical cap is first deformed. Then, each component is inverted inside the next component and energy dissipation occurs due to bending of the cap, curling of the edges and circumferential strain of the tube wall. The purpose of this study is to investigate the effect of spherical cap, mandrel, edges length, number of components and tube thickness on the initial peak load and specific energy absorption. Therefore, the inversion process under axial compression is simulated using ABAQUS nonlinear finite element code and load–displacement curves and deformation mode of the tubes are analyzed. Also, in order to investigate the accuracy of the numerical simulation, a number of experimental tests were performed which have obtained acceptable results. The results show that the proposed energy absorber can be a suitable model to reduce the initial peak load and prevent damage caused by collision and to improve specific energy absorption. In addition, it can be a suitable alternative for energy absorbers under the progressive buckling process.
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Azarakhsh, S., Rezvani, M.J. & Maghsoudpour, A. Experimental and numerical investigation of free inversion mechanism on spherical-capped multi-component circular tubes as energy absorbers. J Braz. Soc. Mech. Sci. Eng. 45, 337 (2023). https://doi.org/10.1007/s40430-023-04158-1
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DOI: https://doi.org/10.1007/s40430-023-04158-1