RU2331835C1 - Flak jacket armour protection - Google Patents

Abstract

FIELD: security facilities.

SUBSTANCE: flak jacket armour protection includes front and back armour elements. The back armour element is made of multi-layer ballistic fabric polygon with a fastening edging. The front armour element is made of a chest and trunk armour panels. The chest armour panel represents a curvilinear trapezium with rounded angles, with convex outside and asymmetric relative to its vertical and horizontal axes. The trunk armour panel represents a rectangle with convex outside and is arranged overlapped relative to the chest armour panel. The area of every front and back element (S_be, dm²) is calculated from the expression S_be=S_v.o.p.a. ×f_dr, where S_v.o.p.a. is the vital organ protection projection area, dm², and f_dr is the dimensional ratio factor determined proceeding from anthropological peculiarities of a person and making 1.1 to 1.2.

EFFECT: armour protection smaller weight without losing protection properties.

1 tbl, 8 dwg, 1 ex

Description

The invention relates to the field of military equipment and can be used in the development and manufacture of body armor for personal protective equipment, in particular for body armor used by the security service, operative workers or the civilian population to protect vital organs from bullet, fragmentation and stitching.

Known body armor for body armor, consisting of armored plates mounted end-to-end, and armored strips mounted above the joints of armored plates in intersecting directions, while armored bands are made of a set of individual armor elements, with armored elements of one direction overlapping joints between four adjacent armored plates, and armored elements of armored bands of another direction joints between two adjacent armor plates, while the armor elements of the armored strips are made with a section in the form of a segment and face flat surface to the armored plates, while the armored elements of the armored strips of one direction are made in the longitudinal direction with a curvature equal to the curvature of the outer surface of the armored plates, and the width of the armored strips is selected from the condition of overlapping the joint between the armored plates at its maximum opening, and armored plates and armored elements of armored strips are installed in pockets of high modulus organic tissue (see RF patent No. 2091693, CL F41H 1/02 of 06/07/94).

The disadvantage of this armor is the complexity of its manufacture and a fairly high weight. Body armor made using this body armor is heavy and inconvenient during operation.

Also known is the prototype armor protection for body armor, including the front armor and the back armor made of multilayer ballistic fabric in the form of a polygon equipped with a fastening edging around the perimeter (see Personal protective equipment (Service Manual), It was put into effect by order of the head of the GRAU of the Ministry of Defense of the Russian Federation No. 166 dated April 16, 2004, M., 2004, p.41-43, Body Armor 6B23-1).

The disadvantage of this armor protection is insufficient weight reduction, since the possibilities of reducing the weight of the armored elements due to the optimal execution of their shape, covering only the vital organs of the upper body of the person, have not been used. Overweight body armor using this body armor does not meet modern requirements for operational amenities. In addition, the monolithic performance of armored elements does not allow to increase the motor function of a person in a combat situation.

The technical result of the present invention is to reduce the weight of the body armor and improve the operational properties without reducing its protective characteristics.

The specified technical result is achieved due to the fact that in the body armor for body armor, including the front armor and the back armor made of multilayer ballistic fabric in the form of a polygon equipped with a fastening edging around the perimeter, the front armor consists of a chest armor panel made in the form of a curved trapezoid angles convex from the outside and asymmetric with respect to its vertical and horizontal axes, and from a torso armor panel made in the form of a rectangular ika convex on the outside and placed overlapping armor panels relative thoracic forehand armor elements, wherein the area of each of the forehand armor elements and back calculated from the formula

S _be = S _sp.h.v.o × k _pc,

where S _be - the area of each of the armor elements; S _pr.zh.v.o - projection area for the protection of vital human organs; k _p.s - coefficient of dimensional conformity, determined in accordance with the anthropological characteristics of a person and equal to _kp.s = 1.1-1.2.

In the study of the technical level of the invention, no technical solution was found that has the features of the proposed armor protection, on the basis of which it can be considered that the proposed solution meets the criterion of "technical level".

The invention is illustrated by drawings, where Fig. 1 shows a chest armor panel of a front armor (front view), Fig. 2 - chest armor of a front armor (side view), Fig. 3 - torso armor panel of an armored front (front view), in Fig. .4 - torso armor plate of the front armor (side view), Fig. 5 - armor of the front (relative placement of the chest and torso armor panels), Fig.6 - armor of the back (front view), Fig.7 - armor of the back (side view) ), Fig. 8 shows a Cartesian coordinate system with a curvilinear rapetsiey to integral calculus.

The body armor for body armor consists of the front 1 and back armor elements 2. The front armor 1 consists of the chest armor panel 3, made in the form of a curved trapezoid with rounded corners 4 convex from the outside and asymmetric with respect to its vertical 5 and horizontal 6 axes, as well as from the torso armor panel 7, made in the form of a rectangle convex from the outside and lapped relative to the chest armor panel 3 of the front armor 1. The implementation of the armored front 1 is non-monolithic, and composite It increases the motor function of a person in a combat situation. The body armor for body armor also contains a back armor 2 made of multilayer ballistic fabric 8, for example, Rusar, Twaron or Kevlar, in the form of a polygon equipped with a fastening edging 9 around the perimeter.

The front armor 1 is made of metal or from other materials, such as ceramics. The radii of the rounding angles 4 of the curved trapezoid Ri, where i is from 1 to 16.

When determining the optimal shape of the armored elements of the front 1 and back 2, which allows them to reduce their weight without reducing their protective properties, the area of each of the armored elements of the front 1 and back 2 is determined by the formula

S _be = S _sp.h.v.o × k _pc,

where S _be - the area of each of the armor elements;

S _pr.zh.v.o - projection area for the protection of vital human organs;

k _p.s - coefficient of dimensional conformity, determined in accordance with the anthropometric characteristics of a person and equal

k _pc = 1.1-1.2.

The coefficient of dimensional conformity k _p.s. allows _you to take into account changes in armor elements (degree of convexity, size) depending on the size of the body armor. The coefficient was determined empirically in accordance with the anthropometric characteristics of a person:

k _pc = 1.1-1.2.

When determining the coefficient of dimensional conformity k _p.s., bulletproof vests of I-II size (height 164-182) and III-IV size (height 186-194) were put on military personnel of the corresponding height with subsequent measurements and the application of the chest and dorsal sections of the protection areas of vital organs (LHV) of a person on a planar figure of a person.

By the area of protection of an armored element, we mean the area of the external "front" surface of the protective structure of an armored element, oriented in the direction toward the expected approach of the striking means. The area of protection of the steel “molded” armored element will be considered equal to the area of its development, as well as the area of the flat blank of the armored element before the technological molding operation, for example, by stamping.

The area of protection of an armored element having a simple geometric shape can be defined as the sum of the areas of its simple geometric shapes - rectangles, trapezoids, triangles, etc. The calculation of the area is carried out according to the well-known in mathematics method of measuring the area of the class of squared figures according to Jordan. Integral calculus by this method allows you to calculate the area of any flat quadratic figure.

The chest armor panel 3 of the front armor 1 can be represented in the form of a curved trapezoid, i.e. a figure bounded by a graph of a continuous and non-negative function f (x) defined on some segment [a, b], ordinates drawn at points a and b, and a segment of the coordinate axis Ox between points a and b.

In accordance with this definition of a curved trapezoid and for the convenience of calculations, we place the trapezoid figure in the first quadrant of the Cartesian rectangular coordinate system so that the lower edge of the trapezoid figure is on the coordinate axis Ox, and one of the side edges is on the coordinate axis Oy. Thus, the calculations will be carried out on the segment [0, L], where L is the width of the trapezoid figure.

The upper boundary of the trapezoid figure is set in the form of arcs of circles and segments of straight lines, and the lines are either external or internal tangent to these circles, i.e. can be analytically given in the form of a piecewise continuous function f (x), which for various segments of the segment [0, L] takes the form of circle equations solved with respect to the ordinate

(where X ₀ , Y ₀ are the coordinates of the center of the circle, R is the radius of the circle)

or straight lines

y = kx + b

Each of the areas equal to the value of a certain integral of the corresponding piecewise continuous function on the segment [0, L] can be expressed as the sum of certain integrals of the functions describing the piecewise continuous function on all parts of the segment [0, L].

where L is the width, N is the height of the armor plate figure;

the coordinates of the centers of the arcs of circles Y _i , X _i , the radii R _i are shown in the drawing, and the plus or minus sign in front of the radical in the equation of the circle is determined by which part of the hemisphere - upper or lower - defines the arc;

the coefficients k _i , b _{i of the} equations of lines, as well as the limits of integration L _{i are} determined either according to the drawing, or by solving a separate problem of finding common tangents to two circles. This problem for the figure, the claimed curved trapezoid has analytical solutions.

The calculation of the projection area of vital human organs S _{a.pr.w.w. was} performed as the calculation of the area having a simple geometric shape, which can be defined as the sum of the areas of its simple geometric shapes - rectangles, trapezoids, triangles, etc.

Note that the obtained integrals can be represented in the form of elementary functions; therefore, for the area S _we have an exact solution. Substituting the obtained numerical value of S _av.h.v.o. and k _p.s. according to the proposed formula S _be = S _av.h.v.o × k _p.s. , the areas of each armored _element were calculated.

The results of the corresponding calculations and measurements are given in the table.

The nominal size of the passport on the BZ for human growth, cm Frontal (chest) part of body armor Dorsal (back) part of the body armor S _sp.zh.v.o , dm ² k _p.s S _be , dm ² S _sp.zh.v.o , dm ² k _pc S _be , dm ² I-II (164-182) 9 1,1 9.1 8 1,1 8.8 III-IV (186-194) 9 1,2 10.8 8.1 1,2 9.7

In accordance with the results obtained, the shape of each of the armor elements of front 1 and back 2 is determined.

The work of body armor for body armor is as follows.

When a bullet, fragments or piercing-cutting weapons hit the surface of the armored front 1 or back 2, they linger in it, without affecting the person. In this case, the kinetic energy of the damaging element (blade, bullet, fragment, etc.) is wasted in overcoming the resistance forces from the armor protection.

The industrial applicability of the proposed technical solution is confirmed by experimental data.

Example.

Tests of body armor for body armor to determine its protective properties were carried out at an ambient temperature of 20 ± 10 ° C. Requirements for the landfill, weapons and ammunition according to GOST V 23958-91.

The mass of the metal armor of the front 1 is 2.9 kg with a thickness of 6.3 mm and an area of 9.1 dm ² , and the armor of the back 2 with a mass of 4.3 kg, with a thickness of 6.3 mm and an area of equal to 8.6 dm ² . The weight of the entire body armor is not more than 7.9 kg.

The test sample of body armor in body armor was fixed on a flat mannequin made of wood with a thickness of 30-40 mm, covered with felt GOST 6308-71 with a thickness of 20 ± 5 mm. For uniform shelling, a periodical change in the position of the bulletproof vest was carried out, turning it 180 ° every 10 minutes of shelling.

At a distance of 1.5 m from the muzzle of the weapon, a mannequin with body armor was installed. The distance from the muzzle of the weapon to the place of the intended hit (firing distance) was maintained with an error of not more than 50 mm.

At a distance of 0.8 and 1.2 m from the body armor, sensors were installed for measuring the speed, providing speed measurement with an error of not more than 5%.

The measured velocity of the striking element (V 0.75) was taken as the speed of the meeting with armor protection (strike speed). Other methods of measuring the speed of the striking element with an error of not more than 0.5% are allowed.

After each shot, damage was assessed: penetration / non penetration. When examining the body armor of the body armor after testing, it was found that the armor elements were not pierced through and therefore, they were reliably protected during shelling.

The tests showed that the proposed armor protection provided a set of protective characteristics against these types of exposure.

The claimed technical solution will allow through the use of distinctive features:

- to reduce the weight of body armor, and consequently, of body armor, which will increase the motor function of a person in a combat situation;

- provide reliable human protection;

- improve the operational comfort of body armor made using the proposed body armor;

- improve compatibility with equipment.

Claims (1)

An armor protection for body armor, including a front armor and a back armor made of multilayer ballistic fabric, made in the form of a polygon with a fastening edging along its perimeter, characterized in that the front armor consists of a chest armor panel made in the form of a curved trapezoid with rounded corners with protruding corners and asymmetric with respect to its vertical and horizontal axes, and from a torso armor panel made in the form of a rectangle convex from the outside and placed inside overlap relative to the chest armor panel, while the area of each of the front and back armor elements (S _be , dm ² ) is calculated by the formula S _be = S _av.h.v.o × k _r.s. , where S _av.h.v.o - projection area of protection of vital organs of a person, dm ² , ak _rs - coefficient of dimensional conformity, determined in accordance with the anthropological characteristics of a person and equal to 1.1-1.2.

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