Abstract
The formation behavior of coated explosive formed projectiles (CEFP) with different structure and material liners were numerically simulated by AUTODYN-2D. There are many factors affecting the coating effect of CEFP, the numerical simulation results show that the structure and liner material have remarkable influence on the velocity and forming effect of the CEFP. For the coating effect, the liner thickness has an optimum range. When the liner thickness is small or large, the explosive balls will deform seriously or not be wrapped sufficiently, and the EFP velocity decreases with increasing the axial thickness of the liner, when the liner thickness is 4.5mm and 5mm, the coating effect is the best. The curvature of liner also has an optimum interval, when the curvature of liner is small or large, the explosive balls will be lengthened or retrogradely compressed and destroyed, and the EFP velocity increases with the decreasing the curvature of the liner. When aluminum, iron, copper and tungsten are used as liner materials, the density and ductility of the material will affect the coating effect. The high density copper liner can achieve a good coating effect and well penetration performance.
Highlights
Explosive formed projectile (EFP), forges metal liner into a solid projectile-like penetrator body through the energy gathering effect produced by explosive explosion
The results showed that EFP with tilted tail formed by asymmetric shell could improve flight stability and accuracy of impacting to target
The influence of the structure and material of liner on the formation behavior and velocity of the coated explosive formed projectiles (CEFP) is studied by the numerical simulation
Summary
Explosive formed projectile (EFP), forges metal liner into a solid projectile-like penetrator body through the energy gathering effect produced by explosive explosion. The results showed that EFP with tilted tail formed by asymmetric shell could improve flight stability and accuracy of impacting to target. In 2013, Liu Jianqing, Guo Tao et al [8] used numerical simulation to study the process of three-point detonation forming tail EFP, and analyzed the variation of the waveform structure and strength during the detonation propagation process, as well as the characteristics and rules of driving deformation of liner materials under the action of composite detonation wave. A new type of coated explosive formed projectiles (CEFP) formation behavior is studied. The design of CEFP involves common EFP design parameters such as liner, charge and shell design, and critical initiation characteristics of the coated explosive. Based on the AUTODYN-2D non-linear dynamics software, the formation behavior of CEFP is simulated in this paper, in order to investigate the influence of liner thickness, curvature and material on CEFP
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