Abstract
The PELE (penetration with enhanced lateral efficiency) projectile is a new type of safe ammunition which can form a large number of fragments after perforating the target, and does not depend on any pyrotechnics. The damage characteristics of PELE projectile mainly include the penetration ability and fragmentation effect. There are many factors affecting the damage characteristics of PELE projectile, and this paper attempts to study the damage characteristics of PELE projectile, from the point of view of changing the single core material. Therefore, four different inner core combination types were designed in this paper, namely, zero gradient—I type (PE), zero gradient—II type (Al), positive gradient type (PE + Al), and negative gradient type (Al + PE). With the help of a more mature numerical simulation method, the studies were carried out from several aspects, such as the axial residual velocity of projectile, the radial scattering velocity of fragments, the radial scattering radius of fragments, and the residual length of projectile. The axial residual velocity of projectile can characterize the penetration ability of projectile, the radial scattering velocity and radial scattering radius of fragments can predict the damage area of fragments, and the residual length of projectile can reflect the fragment conversion rate of casing. The results indicate that the negative gradient inner core combination is superior to the other three combinations in terms of the penetration ability and fragmentation effect. Under the same impact velocity, the maximum radial velocity and radial scattering radius of fragments mainly depend on the front inner core material, and these two parameters will increase appropriately with the increase of the strength of front inner core material. Similarly, the residual length of projectile can be reduced, or the fragment conversion rate can be enhanced, by properly reducing the strength of rear inner core material. The conclusions obtained in this paper can provide a reference for engineering applications.
Highlights
The PELE projectile is a new type of safe ammunition proposed and developed in recent years [1,2]
When a PELE projectile impacts the target plate at relatively high velocity, the high-density casing penetrates the target plate first, and the low-density inner core material is squeezed between the projectile and target plate, which results in high dynamic pressure inside the projectile
When the dynamic pressure reachesoforhigh-density exceeds projectile has gooddynamic penetration performance, the outer casing is usually composed the strength limit of the casing material, the casing will be cracked and break into a large number of metal materials, such as tungsten or steel; in order to ensure the inner core has good compressibility, fragments, due to stress unloading after perforating the target plate, which significantly enhances the the inner core material is usually composed of low-density materials, such as aluminum or plastic
Summary
The PELE (penetration with enhanced lateral efficiency) projectile is a new type of safe ammunition proposed and developed in recent years [1,2]. When the dynamic pressure reachesoforhigh-density exceeds projectile has gooddynamic penetration performance, the outer casing is usually composed the strength limit of the casing material, the casing will be cracked and break into a large number of metal materials, such as tungsten or steel; in order to ensure the inner core has good compressibility, fragments, due to stress unloading after perforating the target plate, which significantly enhances the the inner core material is usually composed of low-density materials, such as aluminum or plastic. Tu et al [17,18] studied the effect of target thickness, impact velocity, and casing/core material compressive-tensile strength of outer casing on the fragmentation effect of PELE projectile. That it isan hoped that an optimum core combination can be found to provide guidance and reference for the structural design of scheme of inner core combination can be found to provide guidance and reference for the structuralPELE projectile inofengineering application
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