Numerical and theoretical investigations on crashworthiness of star-shaped hybrid multi-cell tubes

KONG Zhicheng; HU Jun; GUO Zhiping

doi:10.11883/bzycj-2022-0549

Volume 43 Issue 8

Aug. 2023

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KONG Zhicheng, HU Jun, GUO Zhiping. Numerical and theoretical investigations on crashworthiness of star-shaped hybrid multi-cell tubes[J]. Explosion And Shock Waves, 2023, 43(8): 083101. doi: 10.11883/bzycj-2022-0549

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KONG Zhicheng, HU Jun, GUO Zhiping. Numerical and theoretical investigations on crashworthiness of star-shaped hybrid multi-cell tubes[J]. Explosion And Shock Waves, 2023, 43(8): 083101. doi: 10.11883/bzycj-2022-0549

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Numerical and theoretical investigations on crashworthiness of star-shaped hybrid multi-cell tubes

doi: 10.11883/bzycj-2022-0549

School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China

Received Date: 2022-12-09
Rev Recd Date: 2023-03-20

Available Online: 2023-05-25

Publish Date: 2023-08-31

Abstract

Abstract

In order to develop a lightweight and efficient energy absorption device, a novel type of the star-shaped hybrid multi-cell (SHM) tubes based on the hybrid design of polygonal cross-section and star-shaped cross-section was proposed. The finite element (FE) models of the polygonal thin-walled (PT) tubes, the star-shaped thin-walled (ST) tubes and the SHM tubes were established by ABAQUS, and the reliability of the FE model was verified by simulating quasi-static axial crush tests. Then, the energy absorption characteristics and deformation modes of three kinds of thin-walled tubes under axial loading conditions were studied by numerical simulation. Based on the simplified super folding element (SSFE) theory, the theoretical formula of the mean crushing force of the SHM tubes under the progressive folding deformation mode is established. The numerical results show that there is a synergistic effect between the polygonal cross-section and the star-shaped cross-section of the SHM tubes. Compared with the PT tubes and the ST tubes, the energy absorption of the SHM tubes is significantly improved. When the number of polygon edges N=6, the cross-section synergistic effect of the SHM tubes is the best, and the energy absorption efficiency is the highest when N=8. Subsequently, the investigations on geometric parameters of the SHM tubes are carried out, and the effects of wall thickness and star angle on crashworthiness are discussed respectively. It is found that the wall thickness has obvious influence on the crashworthiness of the SHM tubes, and the crushing force level increases linearly with the increase of the wall thickness. In addition, the change of the star angle has little influence on crashworthiness. The crushing load efficiency and the specific energy absorption increase first and then decrease with the increase of the star angles. When the star angle α=120°, the SHM tubes has the most excellent crashworthiness. The research results can provide design methods and theoretical guidance for the cross-section design of multi-cell structures.
- thin-walled tubes,
- hybrid cross-section design,
- energy absorption,
- parametric analysis,
- theoretical prediction.

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References(29)

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