The method of magnetic-impulse distribution of conductive shells and device for its implementation

 

(57) Abstract:

Usage: magnetic-pulse processing of materials, in particular, for disposal (disarming) ammunition. The inventive on the outer surface of the shell create a magnetic field, first increasing to values of the magnetic induction B Baboutand then quickly disappearing over time twith. The device includes a solenoid (inductor) 4 with a cavity 3 for placement of the metal housing 1 with the explosive 2. The solenoid is connected with the capacitor battery 5 through the switch 6 and the high speed (e.g., explosive) NC 7. 2 S. p. f-crystals, 1 Il.

The invention relates to techniques for magnetic-pulse processing of materials and can be used in the disposal (disarming) ammunition.

There is a method of demilitarization of ammunition through leaching from the body of the explosive jet of water and installation for its implementation, including the pump, the device increase the fluid pressure, the cylinder with the nozzle.

The disadvantage of this method is its low productivity, environmental harm, loss of use of the extracted case of explosives without the pulse-distributing conductive membranes and installation for its implementation, which is the closest to the present invention to the technical nature and accept for the prototype [1] Method is to create on the inner surface of the shell of a pulsed magnetic field to the rise time of the magnetic induction up to a maximum value less time diffusion of the magnetic field through the shell. The consequence of this is the extension (distribution) of the shell. The installation includes sequentially electrically enabled capacitor battery, the switch of the electric circuit and the inductor for placement in the inner cavity of the shell.

The disadvantage of this method and installation for its implementation is the inability of their use at disarming ammunition with explosive due to the presence in the body cavity of the filler, eliminating the possibility of housing the coil and the creation of pulsed magnetic field on the inner surface of the housing.

The task of the invention is to enhance the functionality of the method of magnetic-impulse distribution conductive membranes by ensuring its applicability for shells with a non-conductive filler and a specific use for sulecin by in the known method of magnetic pulse distribution conductive membranes, including creating an alternating magnetic field on the surface of the shell, the magnetic field created on the outer surface of the shell, in this first provide a slow increase up to values of the magnetic induction BBaboutand then the rapid disappearance at time twithwhile the minimum value of the magnetic field depends on theo, Y, raboutand is

< / BR>
whereo1,25610-6GN/m is the magnetic constant, Y is the yield stress of the material of the shell, raboutthe inner radius of the shell, the shell thickness,

< / BR>
=oro/2 the characteristic time of change of the magnetic field inside the shell, the conductivity of the membrane material.

The proposed method is implemented due to the fact that in the known installation for magnetic-pulse distribution conductive membranes containing sequentially electrically connected capacitor battery, the switch of the electric circuit and the inductor to interact with the shell, the inductor is made with the inclusion membrane, and the electrical circuit also includes a fast-acting circuit breaker.

The creation of the magician is agnitas induction B at a time tnneeded to avoid skin effects. When the rise time of tnsignificantly more time tddiffusion, magnetic field penetrates (diffuses) into the depth of the shell and in its cavity. The specific value of tnis determined by the known rules of electrodynamics [2]

At much faster (in the limiting case of instantaneous) the disappearance of an external magnetic field begins the process of reverse diffusion (the output of the magnetic field from the housing or cavity). In case arise induction currents , whose interaction with the magnetic field leads to the appearance of radial tensile electromagnetic forces.

Occur in the sheath material of the electromagnetic force F depends simultaneously on the values of the magnetic induction B and the density of the induction of currents j. In turn, the current density j depends on the degree of non-uniformity of the spatial distribution of the magnetic field . The degree of uneven distribution of magnetic induction across the shell thickness is inversely proportional to time twiththe disappearance of the magnetic field on the outer surface. For example, if a very slow decay of the magnetic field inside the body accounts for the haunted currents will be small, and emerging in the housing material electromagnetic forces will not be able to overcome the resistance of the internal structural forces and to provide radial deformation of the shell, even if a very large value of induction B is pre-created in the body and in its cavity a magnetic field. On the contrary, with the rapid disappearance of the magnetic field on the outer surface, the magnetic field does not have time "to go" from the shell, and induction currents are high. At a sufficiently large value of the induction B pre-generated magnetic fields, electromagnetic forces can overcome prochnosti resistance of the shell and ensure its radial deformation.

The minimum necessary to ensure distribution of the shell casing is the magnetic field Baboutdepending on the geometric parameters of the shell, physico-mechanical and electrophysical characteristics of its material and time decay of the solutions of the equations of motion of incompressible rigid-plastic shell [3] together with the Maxwell equations. The need to ensure the magnetic induction in accordance with relation (1) is also confirmed by the numerical solution of one-dimensional nonstationary problems m the shell. If B Baboutthe shell is deformed in the radial direction, looking up from the filler, and the resulting deformation is greater, the greater the excess of the established magnetic field above the minimum required.

Comparative analysis of the prototype allows us to conclude that the claimed method of magnetic pulse distribution shells and device for its implementation meet the requirement of novelty. The inventive method differs from the known technical solutions the place of application of magnetic-impulse load, settings, modes, and enables the distribution of membranes with a non-conductive filler, such as buildings rasarajani ammunition. The proposed device is different from the known form of execution of the inductor, providing coverage of the conductive shell, and the inclusion of additional electrical circuit element of a high-speed switch.

Known technical solutions in the field of magnetic-pulse processing of materials and the number of adjacent regions, using the creation of a magnetic field on the outer surface of the shell with the inductor, covering the shell. However, the proposed found in the technical solution, the parameters (time narasimhaswami shell inductor of a high-speed breaker in the aggregate not detected in any of the known technical solutions. This indicates compliance with the requirement of inventive step of the proposed technical solutions.

The drawing shows the circuit implementation of the proposed method of magnetic pulse distribution conductive membranes in relation to the release of ammunition with metal housing and populates it with the explosive.

Ammunition with metal housing 1 and populates it with a non-conductive filler explosive 2 is placed in the generating device external to the munition axial magnetic field, for example in the cavity 3 coaxially with the housing 1 of the solenoid 4, connected to a source of electrical energy of the capacitor battery 5 through the switch (contact) 6 and high-speed (e.g., explosive) NC 7.

For definiteness, as an example, consider the release of housing of the main detonator fuse devices consisting of a steel shell ( 11,31061/(Mme), Y 0,2 HPa) with an internal diameter of about 20 mm and a wall thickness of about 1 mm, filled with explosive.

The characteristic time of change of the magnetic field inside the shell is t 70 μs. The minimum required for distribution is megateam 7 time twiththe disappearance of the magnetic field on the outer surface of the shell. Considered as an example of the explosive breaker ensures that the value of twith50 µs. In this case, the ratio (1) (2) define the required value of induction pre-created in the shell and in the cavity of the magnetic field as B Babout8,6 T.

The proposed device operates as follows. In the initial state, the switch 6 is open, and a fast-acting circuit breaker 7 is closed. After charging the capacitor battery 5 to the required voltage closes the switch 6. The capacitor Bank 5 is discharged to the solenoid 4, and in the cavity of the solenoid 4 is generated external to the metal housing 1 axial magnetic field. The parameters of the electric circuit are selected according to certain rules [2] based on the need to ensure that the rise time of the discharge current (and hence the magnetic field in the cavity of the solenoid) to the maximum value, significantly more time diffusion of the magnetic field in the housing shell, for example tn>10=700 μs. The magnetic field penetrates into the housing 1 and the inner cavity and reaches its maximum on time value B (Babout8,6 T. Peredelanye magnetic field through the thickness and in the cavity of the housing 1. After reaching the external magnetic field maximum time value of B is opened explosive breaker 7, providing sharp (within tens of microseconds, twith50 µs) reduction to zero of the discharge current in the circuit and the magnetic field in the cavity 3 of the solenoid 3 and the outer surface of the housing 1. Arising after the disappearance of the external magnetic field ponderomotive force sufficient to deform and violations of the housing 1 while maintaining intact the explosive charge 2. When we get in the end result depends on the degree of excess of the induction B generated magnetic field above the minimum required value of Babout. According to available estimates, B 1,15 Baboutconsider as an example the shell breaks away from the equipment and receives about 20% radial deformation. When B 1,4 Baboutthe shell will receive the radial expansion of more than 1.5 times that will entail not only its separation from equipment, but also the destruction of the body [3]

The use of the proposed method will improve the safety of the ammunition demilitarization, especially small calibre and containing highly sensitive explosives (initiation), Itno pulse-distribution conductive membranes, including the creation of an external alternating magnetic field on the surface of the membrane, with subsequent movement and deformation, characterized in that the external magnetic field created on the outer surface, first ensure its slow increase up to values of the magnetic induction B B0and then the rapid disappearance at time twithand minimum value of the magnetic induction B0choose depending on the time of the disappearance of twith, the yield strength Y and conductivity of the membrane material, its inner radius r0and the thickness d

< / BR>
where

< / BR>
< / BR>
t=oro/2

o=1,25610-6GN/m is the magnetic constant.

2. Device for magnetic-pulse distribution conductive membranes, comprising sequentially electrically connected capacitor battery, the switch of the electric circuit and the inductor to interact with the shell, characterized in that it inductor made covering membrane, and the electrical circuit also includes a fast-acting circuit breaker.

 

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