Structural Engineering and Mechanics

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Impact performance study of filled thin-walled tubes with PM-35 steel core

  • Kunlong Tian (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Chao Zhao (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Yi Zhou (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Xingu Zhong (Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control) ;
  • Xiong Peng (School of Civil Engineering, Hunan University of Science and Technology) ;
  • Qunyu Yang (School of Civil Engineering, Hunan University of Science and Technology)
  • Received : 2022.07.01
  • Accepted : 2024.06.19
  • Published : 2024.07.10
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Abstract

In this paper, the porous metal PM-35 is proposed as the filler material of filled thin-walled tubes (FTTs), and a series of experimental study is conducted to investigate the dynamic behavior and energy absorption performance of PM-35 filled thin-walled tubes under impact loading. Firstly, cylinder solid specimens of PM-35 steel are tested to investigate the impact mechanical behavior by using the Split Hopkinson pressure bar set (SHP); Secondly, the filled thin-walled tube specimens with different geometric parameters are designed and tested to investigate the feasibility of PM-35 steel applied in FTTs by the orthogonal test. According to the results of this research, it is concluded that PM-35 steel is with the excellent characteristics of high energy absorption capacity and low yield strength, which make it a potential filler material for FTTs. The micron-sizes pore structure of PM-35 is the main reason for the macroscopic mechanical behavior of PM-35 steel under impact loading, which makes the material to exhibit greater deformation when subjected to external forces and obviously improve the toughness of the material. In addition, PM-35 steel core-filled thin-wall tube has excellent energy absorption ability under high-speed impact, which shows great application potential in the anti-collision structure facilities of high-speed railway and maglev train. The parameter V0 is most sensitive to the energy absorption of FTT specimens under impact loading, and the sensitivity order of different variations to the energy absorption is loading speed V0>D/t>D/L. The loading efficiency of the FTT is affected by its different geometry, which is mainly determined by the sleeve material and the filling material, which are not sensitive to changes in loading speed V0, D/t and D/L parameters.

Keywords

Acknowledgement

The research described in this paper is financially supported by the Natural Science Foundation of China (52178285), the Natural Science Foundation of Hunan Province (2020JJ5195) and Scientific Research Foundation of Hunan Provincial Education Department (CN) (20B218). The supports are gratefully acknowledged.

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