| Citation: | LIU J，LIU H，YANG J L. Collapse modes and energy absorption performance of conventional and re-entrant hexagonal tubes under lateral compression[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（8）：2021-2028 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0623
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Hexagonal thin-walled structures are widely used in the field of energy absorption and protection. To improve the energy absorption performance of hexagonal thin-walled tubes, in this study, a comparative study on the collapse modes and energy absorption performance of the conventional and re-entrant hexagonal tubes under lateral compression was performed. The theoretical models of these two kinds of hexagonal tubes were established and the effect of strain-hardening was taken into account. Then the finite element analyses were conducted by using the commercial software ABAQUS. The deformation modes and force-displacement relations obtained from the finite element analyses were compared with those predicted by the theoretical models. The results of the finite element and theory show a good degree of concordance. The plastic deformation behavior and energy absorption performance of the conventional and re-entrant hexagonal tubes with different inclination angles under lateral compression were explored. It is found that, compared with the conventional hexagonal tubes, the energy absorption performance of the re-entrant hexagonal tubes is better. The stroke efficiency and energy absorption of the re-entrant hexagonal tubes are respectively 1.41~1.62 times and 1.79~1.83 times those of the corresponding conventional hexagonal tubes. In addition, the re-entrant hexagonal tubes requires less installation space.
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