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Investigating the effect of slit patterns on the deformation of thin-walled tubes under side impact

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Abstract

In this paper, we investigate the deformation of a thin-walled tube under side impact using finite element analysis. The maximum deflection of the tube is reduced by engraving slit patterns on the tube between its center and impact point. By varying the aspect ratio, the number of slits, and the range of a patterned area, we study how slit patterns affect the maximum deflection of the tube in its center. We find that longitudinally thin slits are effective in transforming the impact energy consumed as a cross-sectional deformation into an elliptic shape and reducing the maximum deflection of the tube. Engraving slit patterns on the tube has additional benefits, does not alter the bending stiffness significantly, and decreases the weight.

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Abbreviations

h :

Linear constant for kinematic hardening rule

ζ :

Nonlinear constant for kinematic hardening rule

H :

Height of rectangular slit

H D :

Height of single sub-domain

W :

Width of rectangular slit

W D :

Width of single sub-domain

P N :

Number of slit patterns in a single sub-domain

e :

Cross-section ellipticity

e ref :

Cross-section ellipticity of the reference

e P :

Plastic strain

d :

Center displacement

d ref :

Center displacement of the reference

EI :

Bending rigidity

EI ref :

Bending rigidity of the reference

σ :

Stress

σ y :

Yield stress

σ max,ref :

Maximum stress of the reference

σ max :

Maximum stress

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Acknowledgments

This work was supported by the Technology Innovation Program (20010917, Development of Automotive Parts to Improve Driving Performance and Passenger Convenience using DfAM based 3D Printing Manufacturing Technology) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea

    Youngkyung Do & Do-Nyun Kim

  2. Institute of Advanced Machines and Design, Seoul National University r]1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea

    Do-Nyun Kim

  3. Institute of Engineering Research, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea

    Do-Nyun Kim

Authors
  1. Youngkyung Do
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  2. Do-Nyun Kim
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Correspondence to Do-Nyun Kim.

Additional information

Youngkyung Do received his B.S. degrees in Mechanical and System Design Engineering from Hongik University, Korea, in 2014. He is currently a Ph.D. candidate in the Department of Mechanical Engineering at Seoul National University, Seoul, Korea. His research interests include the mechanical meta-materials for impact absorption.

Do-Nyun Kim is currently a Professor in the Department of Mechanical Engineering at Seoul National University, Seoul, Korea. He received his Ph.D. degree from Massachusetts Institute of Technology, MA, USA in 2009. His research interests include the development of multi-physics, multi-scale, and multi-fidelity simulation.

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Do, Y., Kim, DN. Investigating the effect of slit patterns on the deformation of thin-walled tubes under side impact. J Mech Sci Technol 36, 5649–5655 (2022). https://doi.org/10.1007/s12206-022-1027-4

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  • DOI: https://doi.org/10.1007/s12206-022-1027-4

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