Influence Of The Ratio Of Inner To Outer Diameter On Penetrator With Enhanced Lateral Efficiency

The concept of penetrator with enhanced lateral effect (PELE) is of artifice, which converts axial velocity into lateral velocity, using the difference of kinetic energy and material characteristic of inner part and jacket of PELE. Influence of the ratio of inner to outer diameter (I/O) on PELE is researched in this paper. By changing the ratio of inner to outer diameter (I/O), numerical simulations on PELE of different structures, penetrating homogeneous armour steel target at the same velocities, are completed. The three-dimensional finite element code LS-DYNA is used for the simulation. A new method of judging lateral effect of PELE is first presented. The average lateral kinetic energy of PELE is considered in this method. On some hypotheses, a theoretical model of this method is established for the lateral velocity and average lateral kinetic energy of PELE. The calculation results obtained by the theoretical model are in approximate agreement with the simulated results. Meanwhile, based on the results of theoretical model and numerical simulations, it shows that the lateral velocity of jacket increases along with the I/O and the impact velocity, and the average lateral kinetic energy of jacket is with same trend as the lateral velocity when the I/O is from 0.5 to 0.7. While the I/O exceeds 0.7, the raise of the average lateral kinetic energy of jacket does not increase as quickly as before due to the more loss of the mass. It is concluded that the average lateral kinetic energy of jacket increases with the I/O raising under the situation of jacket of PELE with good penetration.