RU2359210C2 - Imitator of fragments of ammunition natural and preset fragmentation - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to fragmentation and common shells. The proposed imitator of fragments of the ammunition natural and preset fragmentation represents a convex polyhedron with eight cutting ribs. Note here that two polyhedron bases, two triangular lateral sides, four triangular front and rear sides are made mirror like. Six sides have triangular shape, two bases feature the shape of isosceles triangles, while the mean magnitude of the shape parametre makes 1.73. The polyhedron base apex angle equals 30 degrees, the remaining angles at the opposite apex make 75 degrees each.

EFFECT: higher validity of data in testing anti-fragment strength of various composite compositions.

11 dwg

Description

The invention relates to the field of fragmentation and high-explosive fragmentation ammunition, and more specifically to methods for testing the resistance of various obstacles, including anti-fragmentation means of individual armor protection (NIB) to fragmentation action. NIB in such tests are rated for anti-shatter resistance.

The invention is aimed at solving the problem of increasing the reliability of testing individual armor protection equipment for anti-shatter resistance due to the use of the proposed simulator of ammunition fragments in such tests, both in form and in the process of penetrating the NIB anti-shatter fabric protective composition instead of an inadequate simulator of fragments in the form of a one-gram ball .

The development of a simulator model close to real fragments of natural and given fragmentation of ammunition is an urgent issue. Currently, various models of simulators of fragments are known.

To assess the NIB resistance to fragmentation in domestic practice, the existing methodology uses a simulator of a fragment in the form of a one-gram spherical element (ball) with a diameter of 6.3 mm.

In foreign practice, NIB tests are carried out according to the NATO standard STANG 2920, according to which the NIS ballistic resistance is determined by firing at them with the FSP simulator (Fragment Simulating Projectiles), developed by the US Watertown arsenal. It is a cylinder with two bevels at the front end. The STANG 2920 standard provides a parametric series of these models of simulators with a mass of 0.0875 to 53.8 g, however, in practice, the most widely used is a simulator weighing 1.1 g (Figs. 1, 2).

The processes of breaking through NIB ballistic fabric with a ball or FSP simulator and real fragments of natural and predetermined fragmentation are significantly different from each other. This is due to a certain difference in the midsection of real fragments and the presence of sharp cutting shear ribs of the fragments. Therefore, when cutting the threads of the anti-fragmentation fabric protective composition, even at the initial stage of introducing the real fragment, they are not pulled out from the weft and warp of the fabric according to the “cross” pattern, as occurs when the ball or FSP simulator is introduced. Thus, the models of simulators used in the approved methods both in our country and abroad are not similar to real fragments of ammunition, both in form and in the process of penetration of the latter into NIB anti-shatter fabric protective compositions.

In this case, fragments of natural fragmentation (OED) of small mass fractions (Fig. 4) and fragments of a given crushing (OZD) (Fig. 5) are more compact than fragments of large mass fractions of a fragmentation spectrum. Therefore, the model of the simulator of these fragments should reflect this property and have several cutting edges.

The closest models of simulators of fragments of ammunition were proposed by Odintsov V.A. (Patent RU No. 2025644C1, F42B 12/32, 12/30/94, figure 3). Comparative firing of the prototype in question and the claimed simulator show that the simulator of Comrade Odintsova V.A. has very low aerodynamic characteristics. Almost all the time he “fits flat on the target”, and when the NIB is introduced into the anti-fragmentation multilayer fabric protective composition after penetrating its head through 2-3 layers of high-modulus tissue, it sharply deviates from the normal due to significant turning points and the further process penetration is not observed.

Figure 6-11 presents the images in the drawings and photographs of the claimed simulator.

The essence of the invention lies in the fact that the claimed simulator is made in the form of a convex polyhedron (6, 7), which has eight cutting ribs, with two bases, two triangular lateral and four triangular front and rear faces made of mirror, six faces are shaped triangles, two bases - the shape of isosceles triangles. The average calculated value of the shape parameter is 1.73, while the angle at the vertex of the base of the polyhedron is 30 degrees, and the other two angles at the opposite vertex are 75 degrees respectively. The model of the proposed simulator is similar to the averaged form of real OED of small mass fractions and OZD of ammunition and is adequate for the processes of penetration into the NIB anti-shatter fabric protective composition. The claimed simulator of the proposed form in the form of a convex polyhedron has more stable aerodynamic characteristics than the existing prototype. In Fig.6, 7 the following notation:

- A - ribs of the polyhedron (12 in total, 8 of them are cutting);

- In - the triangular base of the polyhedron (B ₁ and B ₂ );

- C - triangular lateral faces of the polyhedron (C ₁ and C ₂ );

- D - triangular frontal and rear faces of the polyhedron (D ₁ and D ₂ , D ₃ and D ₄ );

- β - the angles at the vertices of the bases of the polyhedra (β ₁ and β ₂ ) are equal to 30 degrees;

- α, γ are the angles at the sides opposite to the base vertices (α ₁ , γ ₁ and α ₂ , γ ₂ ); equal to 75 degrees.

The average calculated value of the shape parameter of the proposed simulator is 1.73. For OED fragmentation and high-explosive fragmentation ammunition, the average calculated value of this parameter is 1.85, the closest prototype (patent RU No. 2025644 C1, see figure 3) it is 1.94.

Three mass fractions of these simulators were developed: 0.5, 1.1, and 2.5 grams.

The results of experimental studies make it possible to judge the appropriateness of using this design solution in the form of the main simulator of small-scale mass fractions and explosive ordnance of high-explosive fragmentation and high-explosive fragmentation ordnance when testing the resistance of various barriers to fragmentation.

Compared analysis with the closest prototype of the proposed simulator (patent RU No. 2025644C1, figure 3) allows us to conclude that the inventive simulator is different:

1. The form.

2. The angular relationships between the sides at the base of the polyhedron.

3. Mirror arrangement of two triangular lateral faces of the polyhedron.

4. Mirror arrangement of four triangular frontal and rear faces of the polyhedron.

5. The number of cutting ribs.

Analysis of the known technical solutions (analogues) in the studied area and related areas allows us to conclude that they lack features similar to the significant distinguishing features in the inventive simulator and recognize the claimed technical solution as meeting the "novelty" criterion.

Claims (1)

Simulator of fragments of natural and predetermined fragmentation of ammunition, made in the form of a convex polyhedron, characterized in that the polyhedron has eight cutting ribs, with two of its bases, two triangular lateral and four triangular front and rear faces made of mirror, six faces are triangular in shape, two bases - the shape of isosceles triangles, and the average value of the shape parameter is 1.73, while the angle at the top of the base of the polyhedron is 30 °, and the other two angles are opposite the top - 75 ° respectively.

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