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Acta Armamentarii ›› 2021, Vol. 42 ›› Issue (4): 842-850.doi: 10.3969/j.issn.1000-1093.2021.04.018

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Complex Load of Torpedo Near-field Explosion and Its Damage Mode to Ships

LIU Wensi, LU Yue, ZHOU Qingfei, CHENG Suqiu   

  1. (Unit 91439 of PLA, Dalian 116041, Liaoning, China)
  • Online:2021-06-08

Abstract: A numerical analysis model of near-boundary underwater explosion was established based on nonlinear explicit dynamic analysis software LS-DYNA in order to evaluate the damage efficiency of torpedo underwater explosion to ships. The calculated results of explosion load under near-free liquid surface boundary conditions were compared with the calculated results of empirical formulas in Ref.[6] and the experimental results in Ref.[17], verifying that the proposed numerical simulation method can well reflect the shock wave pressure of the near-field underwater explosion and the multiple bubble pulsation processes. The technology is used to build a numerical simulation model close to the actual combat boundary conditions, and calculate and analyze the damage mode of the torpedo near-field explosion to the ship under multiple conditions. The results show that different boundary conditions in the near field have an important effect on the pulsating load of underwater explosion bubbles. Under different conditions, shock wave, bubble pulsation and water jet load have complex coupling effects with ship structure. The effect of torpedo on the ship in the near field under different conditions shows different energy output structures, which is closely related to the final damage mode of ship, and there is an optimal detonation distance to maximize the total energy of torpedo acting on the ship.

Key words: torpedo, underwaterexplosion, nearfieldboundary, fluid-structureinteraction, damageassessment

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