Spatial Distribution of Mass and Speed on Movement of Two Shrapnel Discs of Variable Thickness in Explosive Load

Abstract

Results of studies of the explosive expansion of a set of shrapnel discs of natural crushing are described in the article. Set consisted of two disks of different thickness, but of a fixed total mass. The studies were carried out by computer simulation of shock-wave processes in a continuous formulation using the ANSYS/LS-DYNA program. The program of computer design foresees development of three-dimensional certainly-element model including, in accordance with symmetry of the examined system fourth part of the examined explosive system of casting block, with imposed on its knots of the proper scopes terms concerted with taken mixed Lagrangian-Eulerian approach within the framework of the continuum model. The effect of the order of installing disks of different thickness on the distribution of their mass and its velocity in the middle of the meridional angle of expansion is established. The analysis of the computer simulation presented on the basis of numerical studies on the distribution of the mass of the disks and its velocity of motion suggests that to create a narrow high-speed uniformly filled fragmentary mass of the axial flow, it is necessary to change the geometric shape of the disc so that in the central angular zones of the disks. This allows the velocity of the fragment mass to be aligned along the radius of the discs and to fill the first angular zones with the required mass of fragments.

Determining the components of the structural-automatic model of firing a single target in armor protection with fragmentation-beam projectiles of directed action in a series of three shots based on the reference graph of states

“…In [14], a model was proposed that makes it possible to estimate the lethal radius (radius of efficiency) of artillery shells against human targets but without taking into account the impact on armored combat vehicles. The results of studies of the explosive action of a set of fragmentation discs of natural crushing are described in [15], which was tion and form the basis of ammunition kits (AK) in artillery systems of ground artillery, as well as are part of anti-tank and tank gun AK [1]. However, these projectiles have a number of key drawbacks that actually level the possibility of their successful use, namely:…”

Building a model of the process of shooting a mobile armored target with directed fragmentation-beam shells in the form of a discrete-continuous stochastic system

“…For example, paper [7] reports the results of mathematical research whose purpose was to determine the size of the dangerous zone of fragmentation damage of an explosive device. To that end, the calculation was performed in the form of the spatial distribution of fragmentation mass and the speed of its movement for two fragmentation disks of variable thickness.…”

“…And work [8] modeled only the process of influence of the explosive load on metal plates. Studies [7,8] are quite interesting but their purpose is not related to the practical implementation in the fight against an enemy's armored vehicles. After all, the process of shooting a tank-type AFV, despite their rapid quantitative growth, is limited to a list of anti-tank missile systems and single samples of anti-tank guns.…”

“…Our review of appropriate studies [7][8][9][10][11][12][13] has revealed an urgent need to devise a universal model of the process of shooting a mobile armored target (AFV) with fragmentation-beam shells of direct action. Such a model, in terms of its capabilities, would create preconditions for experimental studies into the effectiveness of various options for the implementation of components in the artillery system that fires FBS in the series of shots.…”