Energy absorption of new thin-walled, multi-cellular, tubular structures with Sierpinski hierarchical characteristics under axial impact

HE Qiang; WANG Yonghui; SHI Xiaona; GU Hang; CHEN Yu

doi:10.11883.bzycj/2020-0055

Volume 40 Issue 12

Dec. 2020

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HE Qiang, WANG Yonghui, SHI Xiaona, GU Hang, CHEN Yu. Energy absorption of new thin-walled, multi-cellular, tubular structures with Sierpinski hierarchical characteristics under axial impact[J]. Explosion And Shock Waves, 2020, 40(12): 123101. doi: 10.11883.bzycj/2020-0055

Citation:

HE Qiang, WANG Yonghui, SHI Xiaona, GU Hang, CHEN Yu. Energy absorption of new thin-walled, multi-cellular, tubular structures with Sierpinski hierarchical characteristics under axial impact[J]. Explosion And Shock Waves, 2020, 40(12): 123101. doi: 10.11883.bzycj/2020-0055

Citation:

HE Qiang, WANG Yonghui, SHI Xiaona, GU Hang, CHEN Yu. Energy absorption of new thin-walled, multi-cellular, tubular structures with Sierpinski hierarchical characteristics under axial impact[J]. Explosion And Shock Waves, 2020, 40(12): 123101. doi: 10.11883.bzycj/2020-0055

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Energy absorption of new thin-walled, multi-cellular, tubular structures with Sierpinski hierarchical characteristics under axial impact

doi: 10.11883.bzycj/2020-0055

1.
College of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
2.
School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, Jiangsu, China

Received Date: 2020-03-03
Rev Recd Date: 2020-06-07
Publish Date: 2020-12-05

Abstract

Abstract

In order to improve the energy absorption capacity of thin-walled structures, a new type of thin-walled tube (SHT) with hierarchical characteristic was proposed based on the Sierpinski fractal structure. The deformation mode and energy absorption characteristics of SHTs under axial impact load were simulated using the nonlinear finite element method, and compared with those of ordinary triangular thin-walled tubes. The results show that the deformation mode of the new SHT is an axisymmetric progressive buckling mode. With the introduction of the Sierpinski hierarchical characteristics, the half-folded wavelength of the cell wall bending process is reduced, hence more plastic folding elements are formed and more energy is absorbed. Furthermore, theoretical expressions of the axial compression stress were obtained based on the energy conservation theory and plastic hinge theory. The correctness of the theoretical formula was verified by comparing with the finite element simulation. The results display that under the same relative density, the dynamic compressive stresses of the first-, second- and third-order SHTs are 85.8%, 138.2% and 183.8%, respectively, higher than that of the ordinary triangular thin-walled tubes. The introduction of the Sierpinski hierarchical characteristics into the design of the thin-walled tubes can effectively improve the crashworthiness of the thin-walled tubes, and it can provide a reference for the research and design of new energy absorbers.
- thin-walled structure,
- Sierpinski fractal,
- axial impact,
- deformation mode,
- crashworthiness

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References(17)

References

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