RU2634454C2 - Method for forming flat surface of plate, driven by explosive charge explosion products - Google Patents

Abstract

FIELD: blasting works.

SUBSTANCE: invention can be used on the equipment trials where the explosive (EM) charges detonations are used. The method of throwing a plate by virtue of the explosion comprises the initiation of the EM charge, which is placed in contact with at a minimum two supports that are placed orthogonal to the EM charge initiation surface. The supports are set in contact with all charge surfaces that are orthogonal to its initiation surface, and the EM charge initiation is carried out at the crossing point of the charge symmetry plane and the charge surface, which is the most distant from the driver plate.

EFFECT: providing the reduction of the plate flexure, arising in the process of acceleration, up to its flat surface forming.

1 dwg

Description

The invention is intended for use in testing military equipment that use explosive charges of explosives.

A known method of forming a flat surface of a plate, implemented when the device for throwing plates by explosion (Pat. RF No. 2426968, E. V. Krutikova, IB Tarasov, prior. 02.24.2010, publ. 20.08.2011, BI No. 23), in which, for throwing plates with explosion products, it is proposed that the explosive charge be initiated along a line simultaneously belonging to both the charge face most remote from the throwing plate and the device symmetry plane located between the two stops. This method is aimed at ensuring the absence of curvature of the missile plate in the direction between the stops (perpendicular to the explosive charge initiation line) and uses to compensate for the plate deformations by aligning the velocity gradient with the help of shock waves reflected from the stops. This method is selected as a prototype.

The disadvantages of this method are:

- the presence of significant curvature of the missile plate in a direction parallel to the line of initiation of the explosive charge;

- the need for preliminary development and testing of the operability of the explosive initiation system along the line.

The technical problem to be solved by the claimed invention is directed, is to provide conditions for the formation of a flat surface of the plate, tossed by the products of the explosion.

The technical result obtained by the implementation of the proposed method consists in reducing the curvature of the plate that occurs during acceleration in all directions, both longitudinal and transverse, up to the formation of its flat surface and to simplify the initiation system.

This technical result is achieved by the fact that in the method of forming a flat surface thrown by the explosion products of the explosive charge of the plate, including the use of the explosive charge placed in contact with at least two stops orthogonal to the charge initiation surface, it is new that the explosive charge is initiated in the point of intersection of the planes of symmetry of the charge and its surface farthest from the missile plate, and the stops are set in contact with all explosive charge surfaces orthogonal to pendence of his initiation.

As a result of using the totality of the features of the proposed method, the curvature of its surface resulting from the unevenness and time difference between the initial loading of the missile plate decreases to almost complete straightening due to an increase in pressure in the explosion products near stops, compensating for the drop in the specific pressure impulse of the explosion products along the periphery of the missile plate. In addition, the initiation of the explosive charge at the point of intersection of the planes of symmetry of the charge and its surface farthest from the throwing plate allows the use of only one detonator, thereby simplifying the execution of the explosive charge initiation system and significantly increasing the stability of the throwing device.

The invention is illustrated in the drawing, explaining the inventive method. The drawing shows a throwing device: 1 - explosive charge; 2 - point of initiation; 3 - throwing plate; 4 - anti-school clearance; 5 - stops for the formation of reflected shock waves.

The anti-school clearance 4 can be made in the throwing pattern between the explosive charge 1 and the plate 3 to prevent the destruction of the plate being thrown, which is known, for example, from [G.I. Kanel, A.M. Well done, A.A. Vorobiev. “On the throwing of plates by an explosion” // Combustion and Explosion Physics, No. 6 (10), 1974, pp. 884-891; V.A. Ogorodnikov, S.Yu. Pinchukov, V.Yu. Shemyakin et al. “Experimental and computational study of plate acceleration by explosion products through the gap” // Combustion and Explosion Physics, No. 1 (17), 1981, pp. 133-136]. The presence of the gap 4 depends on the thickness of the explosive charge 1 (with a large explosive charge thickness, there may be no gap) and the propagation mode of the detonation wave front relative to the missile plate (in the "falling" mode, the anti-school gap is used more often than in the "sliding" mode).

The implementation of the method is possible both under conditions of plane symmetry of the explosive charge and the throwing device as a whole (shown in the figure), and with axisymmetric execution. The height of the stops in the general case may not coincide with the level of the explosive charge surface.

The method is as follows. To form a flat surface of the plate 3, thrown by the products of the explosion, the initiation of the explosive charge 1 is carried out on its surface farthest from the throwing plate 3, at the point 2 of the intersection of its planes of symmetry (or, with axisymmetric execution of the throwing device, at a point on the axis of symmetry of the explosive charge ) The stops 5 are set in contact with all surfaces of the explosive charge orthogonal to the surface on which the initiation takes place. In this case, the diverging detonation wave is reflected from the stops 5 (or, in the case of an axisymmetric execution of the throwing device - stops 5 forming a ring) in the form of shock waves. As a result, the pressure in the explosion products near the stops increases, which compensates for the drop in the specific impulse of the explosion products along the periphery of the missile plate. The curvature of its surface that has arisen due to the unevenness and time difference between the initial loading of the missile plate and its curvature decreases to almost complete straightening. In addition, the method used allows to simplify the execution of the explosive charge initiation system and provides the use of only one detonator, which significantly increases the stability of the throwing device.

Thus, the implementation of the proposed method reduces the curvature of the plate that occurs during acceleration, up to the formation of its flat surface.

Claims (1)

A method of throwing a plate by an explosion, including the initiation of an explosive charge placed in contact with at least two stops, orthogonal to the explosive charge initiation surface, characterized in that the stops are installed in contact with all charge surfaces orthogonal to its initiation surface, and the initiation of explosive charge is carried out in the point of intersection of the planes of symmetry of the charge and its surface, the most distant from the missile plate.

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