Structural Engineering and Mechanics

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Experimental and numerical investigations of near-field underwater explosions

  • Lee, Seunggyu (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Cho, Junghee (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Chaemin (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Cho, Seongpil (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2020.11.03
  • Accepted : 2020.11.13
  • Published : 2021.02.10
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Abstract

Near-field underwater explosion (UNDEX) phenomena were investigated by experiments and numerical simulations. The UNDEX experiments were performed in a water tank using a ship-like model. One kilogram of TNT, one of the most widely used military high explosives, was used for the experiments. Numerical simulations were performed under the same conditions as in the experiments using the commercial software LS-DYNA. Underwater pressures, accelerations, velocities, and strains by shock waves were measured at multiple locations. Further, the bubble pulsation period and the whipping deformations of the ship-like model were explored. The experimental results are presented and examined through comparison with the results obtained from widely used empirical equations and numerical simulations.

Keywords

Acknowledgement

This work was supported by the Underwater Near-Field Explosion Research Lab funded by the Defense Acquisition Program Administration under Grant UD180001DD. We would like to express our gratitude to Prof. Phill-Seung Lee for his supervision, inspiration, support, and valuable discussions with his instructive comments.

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