Rapid assessment of the spatial distribution of fragments about the D-shaped structure

Abstract

The deformable warhead is a common type of anti-missile warheads, and the geometric configuration of deformable warhead is close to D shape under the lateral blast loading of auxiliary charge. In this article, the spatial distribution of fragments is taken as the research object, and an empirical model for evaluating the spatial distribution of fragments is expected to be established. First, the empirical model was designed based on dimensional analysis and quadratic interpolation. Then, three different D-shaped structures (D-90°, D-120°, D-150°) were studied by the numerical simulations and experiments. In order to minimize the influence of the axial sparse waves at both ends, only the middlemost layer of fragments was researched. The relationships among d/r, sin a, and sin b were obtained (where d represents the initiation distance, a represents the initial position angle, and b represents the scattering angle). With the scattering angle b and target distance l, the spatial distribution of fragments can be deduced. Based on the fitting formula and the parameters of D-shaped structures, the relationships between d/r, sin a, and sin b of arbitrary D-shaped casing (D-u) were obtained using quadratic interpolation. Finally, D-105°structure was verified by numerical simulation and empirical formula, both of which coincided well with each other. Therefore, the empirical model can be used to rapidly evaluate the spatial distribution of fragments, especially suitable for the D-shaped structure with a large length-diameter ratio.

Influence and its Mechanism of Non-reactive Fillers on the Dispersion Characteristics of the Fragments from Charge Structures

“…The current research mainly considers the fragmentation characteristics of the charge structure filled with explosives under different structural shapes, different detonation methods or different shell materials [1][2][3][4][5][6][7][8]. Based on the actual needs of various directional warheads for the directional killing fragments field, researchers have carried out research on the influence of the eccentric initiation effect on the fragmentation field and its formation mechanism.…”

“…However, the eccentric detonation effect does not significantly affect the flying direction of the fragments [4,9]. Because the eccentric initiation method cannot meet the requirements of warhead fragmentation density control, researchers have studied the fragmentation characteristics of non-axisymmetric charge structures, and the results show that the non-axisymmetric charge structure, such as D-shaped and prismatic charge structures, can significantly improve the fragment dispersing density in the target direction [7,8,[10][11][12]. The above conclusions show that the circumferential dispersing direction of the fragments of the charge structure filled with explosives is mainly affected by the shape of the charge structure shell but not by the detonation method.…”

Research on the Formation Characteristics of the Shaped Charge Jet from the Shaped Charge with a Trapezoid Cross-Section

“…The structural characteristics of these precision-guided weapons present largely an asymmetrical cross-section in consideration of the aerodynamics [ 2 ]. Due to these structural constraints, the kinetic warhead and fragmentation warhead are captured extensively for these precision-guided weapons [ 3 , 4 , 5 ].…”

Critical Initiation Threshold of Covered Finite Thickness Explosive under Impact of Shaped Charge Jet

“…In short-range and ultra-short-range interception operations, as the target is close to the terminal point, the defense requires that the target must be damaged effectively in terms as being disintegrated, burned, or exploded, in a very short time. At present, the air defense systems mainly use directional fragment generator warheads, controllable discrete rod warheads, focused warheads, and multiple explosively formed projectiles [1][2], which can achieve interception by enabling the fragments to penetrate the target, thereby causing it to detonate or deviate from the original track. However, achieving the purpose of effective interception by using fragments or explosively formed projectiles for targets with thick-shells (> 100 mm) is difficult [3][4].…”