Abstract
In order to obtain the effect of material characteristics of explosive on the formation of collinear explosively formed projectile (EFP)from warhead with dosuble liners, the LS-DYNA simulation software was used to simulate and analyze the forming process of collinear EFP from warhead with five explosive materials including pe4booster, PETN, TNT, C4 and B explosives. The results indicate that with the increase of density, detonation velocity, and detonation pressure, the velocity and the length diameter ratio of the front EFP and rear EFP increase with different laws. With the increase of explosive material density, the velocity and the length diameter ratio of EFPs increase gradually, but the increasing rate decreases gradually. As the detonation velocity increases, the velocity of EFPs increase gradually, but the increasing rate decreases gradually. The length diameter ratio of EFPs decreases first and then increases gradually, showing an "s"-shaped change law. With the increase of explosive detonation pressure, the velocity of EFPs increase gradually, but the increasing rate decrease gradually. The length diameter ratio of the front EFP shows a parabolic growth law with the increase of detonation pressure, and the length diameter ratio of the rear EFP shows an "s"-shaped change law with the detonation pressure.
Highlights
The collinear explosively formed projectile (EFP) from warhead with multi-layer liners can form multiple collinear EFPs separated from the front and rear EFPs
Tosello et al [3] carried out numerical simulation and experimental research on the underwater motion of double-layer spherical defect hood composed of tantalum and nickel
To find out the influence law of explosive material characteristics on the formation of damage element of double-layer EFP, five explosive materials are selected for simulation research: pe4booster, PETN, TNT, C4, and B explosives, to find out the influence law of explosive density, detonation velocity and detonation pressure on the formation parameters of the projectile
Summary
The collinear EFP from warhead with multi-layer liners can form multiple collinear EFPs separated from the front and rear EFPs. The front EFP is used to detonate the explosive reactive armor, and the rear EFP continues to penetrate the main armor, so as to effectively improve the damage efficiency to new armor. Faibish et al [1] carried out numerical simulation and experimental research on the process of jet formation from the double-layer shaped charge with small cone angle copper liner on the outside and small cone angle tantalum liner on the insider. Ma et al [2] obtained the specific process of the formation and separation of EFP with double layer liners by combining experiment and simulation.
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