Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 333-345.doi: 10.13229/j.cnki.jdxbgxb.20221099

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Comparative analysis on crashworthiness of a novel bamboo⁃like hexagonal gradient hierarchical multicellular tube

Xiao-lin DENG1(),Fu-mo YANG2,Shan-gan QIN2   

  1. 1.School of Electronics and Information Engineering，Wuzhou University，Wuzhou 543002，China
    2.School of Mechanical Engineering，Guangxi University，Nanning 530004，China
  • Received:2022-08-26 Online:2024-02-01 Published:2024-03-29

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Abstract:

A novel bamboo-like hexagonal gradient hierarchical multicellular tube （BHGHMT） was designed. A theoretical solution of the mean crashing force for hexagonal single-gradient hierarchical multicellular tube （HSGHMT） is derived by using the super-folded element method， and the experimental study of the square tube is carried out. The accuracy of the finite element numerical model is verified by using the theoretical solution and the experimental results. The crashworthiness performance of BHGHMTs with different wall thicknesses was analyzed using the validated numerical model. Finally， the crashworthiness performance of the BHGHMT and the conventional square tube （ST）， hexagonal tube （HT）， and HSGHMT under the same mass， the same initial peak force and the same energy absorption were compared. The research results show that the proposed BHGHMT can effectively reduce the initial peak force and improve the crushing force efficiency. The crashworthiness performance of the BHGHMT is better than that of the conventional ST， HT and HSGHMT under the same mass， the same initial peak force and the same energy absorption. The research results can provide a reference for the innovative design of gradient hierarchical multicellular tubes.

Key words: vehicle engineering, crashworthiness, bamboo-like structure, gradient hierarchical multicellular tube, energy absorption

CLC Number: 

  • U463.8

Fig.1

Bamboo vascular bundle distribution and bamboo-like hexagonal gradient hierarchical multicellular tube structure design"

Fig.2

Finite Element Model"

Fig.3

Mesh test results"

Fig.4

Corner element of the hexagonal single-gradient hierarchical multicellular tube"

Fig.5

Comparison of theoretical solution and numerical simulation results"

Fig.6

Material properties and test samples"

Fig.7

Comparison of simulation and compression test"

Fig.8

Force-displacement and energy absorption curves"

Fig.9

Crashworthiness data analysis"

Fig.10

Force-displacement and energy absorption curves under the same mass"

Table 1

Crashworthiness data under the same mass conditions"

名称质量/kg壁厚/mmIPCF/kNEA/JSEA/（kJ·kg-1）CFE/%
ST0.1171.500072.912591.3722.1534.85
HT0.1171.000068.311751.4714.9725.14
HSGHMT0.1170.286668.833597.5230.7551.24
BHGHMT0.1170.34396.333186.6127.24493.52

Fig.11

Impact final state and cross-sectional view of different structures"

Fig.12

Comparison of crashworthiness data under the same mass conditions"

Fig. 13

Force-displacement and energy absorption curves of three different structures under the same initial peak force"

Table 2

Crashworthiness data under the same initial peak force conditions"

名称质量/kg壁厚/mmIPCF/kNEA/JSEA/（kJ·kg-1）CFE/%
ST0.3654.70294.4917334.1547.4857.71
HT0.4083.50295.7115365.0037.6650.94
HSGHMT0.4081.00293.8522210.2554.4474.10
BHGHMT1.1603.40295.6984591.8172.92280.47

Fig.14

Comparison of crashworthiness data under the same initial peak force conditions"

Fig.15

Force-displacement and energy absorption curves under the same energy absorption"

Table 3

Crashworthiness data under the same energy absorption"

名称

质量/

kg

壁厚/

mm

IPCF/

kN

EA/

J

SEA/ （kJ·kg-1）

CFE/

%

ST0.11701.500072.912591.3722.1534.85
HT0.14201.210084.422603.5018.3330.24
HSGHMT0.09430.231040.322584.5427.4162.84
BHGHMT0.10100.29825.342594.1025.68476.26

Fig.16

Crashworthiness analysis under the same energy absorption"

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