Abstract
To study the influence of different liner structures and materials (copper, steel, and tungsten) on the forming characteristics of multiple explosively formed projectile (MEFP) with integrated liner and shell designs, three types of liners with different structures were designed. LS-DYNA was used for numerical simulation, and the results show that the thickness change at the center of the liner has no obvious influence on the shape of the explosively formed projectile (EFP). However, the curvature radius of the liner has a significant influence on the shape of the EFP. When the liner material is copper and the curvature radius of the liner is greater than 8 mm, the EFP shape approximates an ellipsoidal or hemispherical shape and the EFP forming speed is between 1900 m/s and 2400 m/s. When the material of the liner is steel or tungsten and the curvature radius of the liner is thicker than 8 mm, the liner is not able to form projectiles in the shape of a sphere, ellipsoid, or long rod. By comparing the forming speed from 1#EFP to 4#EFP, it can be said that MEFP with integrated liner and shell design displays a certain pressurization effect. Research results show that, for small-caliber MEFP warheads, subject to the size of the warhead, when the liner is steel or tungsten, the detonation energy generated by the limited charge does not result in the liner forming an effective EFP. However, when the liner material is selected as copper, the EFP forming shape and speed are more appropriate.
Highlights
During the Spanish Civil War from 1936 to 1939, the HighExplosive Antitank (HEAT) with a shaped charge effect began to be used
In terms of the liner parameters of Multiple explosively formed projectile (MEFP), Zhang et al [14] studied the influence of charge spacing, charge, and curvature radius on the forming characteristics of MEFP using numerical simulation
In the structure (Figure 1), each column is composed of four liners in the axial direction of the charge; each row is composed of 12 liners in the circumferential direction of the charge. erefore, the circumferential MEFP warhead structure designed in this study had a total of 48 liners, and the liner was centrosymmetric
Summary
During the Spanish Civil War from 1936 to 1939, the HighExplosive Antitank (HEAT) with a shaped charge effect began to be used. In terms of the liner parameters of MEFP, Zhang et al [14] studied the influence of charge spacing, charge, and curvature radius on the forming characteristics of MEFP using numerical simulation. To study the forming performance of the circumferential MEFP with the integrated design of the smallcaliber shell and liner, first, three different structural types of MEFP warheads were designed, wherein the thickness of the liner was smaller than, equal to, and larger than that of the shell, respectively. By using the fluid-solid interaction method, a numerical simulation of the MEFP warhead with three different structure types was carried out, and the forming characteristics of the MEFP were analyzed when the material of the liner and shell was copper, steel, and tungsten, and the simulation results were compared and analyzed. It was submitted to the LS-DYNA solver for calculation
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