Crash Performance of Strength Gradient Tube Induced by Selective Laser Patterning

Hyung Gyu Kim, Nam Hoai Trinh, Jun Beom Kwon, Suk Joon Hong, Sung Hyuk Park, Jong Hun Yoon

Research output: Contribution to journalArticlepeer-review


This paper presents an investigation of the performance of a 22 MnB5 tube after local heat treatment according to a patterning shape under dynamic crash test conditions to propose the patterning shape with the best energy absorption efficiency. Numerical simulations support experimental results to validate the deformation mode during dynamic crash test as well as the strain distribution of the specimen. The helical patterning not only demonstrates the highest axial loading force and energy absorbance in both static and dynamic crash tests, but also can be easily fabricated in a short time. The helical pattern can optimize different pitch sizes according to the thickness and diameter of the cylindrical tube, and it has the highest energy absorption rate with 83.0% in dynamic conditions.

Original languageEnglish
Article number6580
Issue number19
StatePublished - Oct 2022


  • auxetic
  • FEM analysis
  • helical
  • laser
  • laser patterning
  • local hardening
  • strain rate sensitivity


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