Sergey V. Fedorov

Sergey V. Fedorov
Bauman Moscow State Technical University · Department of Precision Aerial Vehicles

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105
Publications
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Introduction
Skills and Expertise

Publications

Publications (105)
Article
The paper focuses on the use of high-speed penetrators in future study of the surface layer of various cosmic bodies, e.g. planets, asteroids, comets. In choosing the design parameters of penetrators, the penetration depth can be predicted according to empirical dependencies, which result from processing experimental data on the penetration of non-...
Article
Explosive launching devices are used to test objects of rocket and space technology for resistance to the impact of meteoroids and fragments of space debris. These include shaped charges with a combined hemisphere-cylinder liner. In these charges, the formation of a high-velocity compact element occurs as a result of “cutting-off” by the collapsing...
Article
In the context of the one-dimensional problem of magnetic hydrodynamics on the collision and spread of plane jets of an incompressible conducting material in which a transverse magnetic field was created before the collision of its jets, the intensification of the magnetic field in the material of such a jet under an extensional strain with elongat...
Article
This research is an investigation about the possibility of using shaped charges forming high-velocity metal jets to obtain high-velocity compact elements. The particular objective here is testing rocket and space technology objects for anti-meteoroid resistance. In order to “cut off” the jet head section and obtain a compact element with a velocity...
Conference Paper
Due to their capability to form high velocity elements, explosive launching devices are used for testing objects of rocket and space technology on anti-meteoric resistance. These devices include shaped charges with a combined hemisphere- cylinder liner. Formation of a high-velocity compact element in this liner results from the "cutting off" by the...
Conference Paper
This research is an investigation about the possibility of using shaped charges forming high-velocity metal jets to obtain high-velocity compact elements. The particular objective here is testing rocket and space technology objects for anti- meteoric resistance. In order to “cut off” the jet head section and obtain a compact element with a velocity...
Conference Paper
The paper considered a penetration into ground-rock targets by non-deformable projectiles with the interaction speeds up to 1000 m/s. Such projectiles, when equipped with recording equipment, can be used for remote sensing of the Earth’s surface layer, the Moon and other celestial bodies of the Solar System. Drag force of the ground-rock targets, w...
Article
According to the calculations, the penetration effect of shaped charges can be significantly increased (by 40–50 % in the case of a high-strength steel target) if due increasing the accuracy of their manufacture the lower speed threshold is reduced at which the penetration of the tail sections of the shaped-charge jet into the target is stopped. Fo...
Article
The paper focuses on experiments carried out to determine the effect of a small-diameter channel, passed by a shaped-charge jet before interacting with an obstacle, on its penetrating action. These experiments were conducted in relation to the study of the features of shaped-charge jet motion through the cavity of an elongated solenoid with electro...
Article
High-speed penetrating modules-penetrators can be used to probe the surface layer of the Earth, and, in the near future, also other Space bodies of the Solar System (planets, asteroids, comets). Influence of additional jet thrust impulse enclosed to the penetrator in the course of its movement in a target on a possible increment of penetration dept...
Article
The paper considers the possibility of using compact projectiles formed by an explosion to break through strong steel barriers of finite thickness protected by a layer of water. There is no problem in penetrating such barriers by high-gradient and high-speed shaped-charge jet of a small diameter formed by shaped charges with ‘high’ conical liners,...
Article
Results of the experimental study of the long solenoid longitudinal magnetic field influence on stretching of metal shaped-charge jets in the free flight are presented. Shaped charges with a diameter of 50 mm with copper conic liner were used in experiments. Parameters of the solenoid discharge circuit with the capacitive store of energy were such...
Article
The inertial stretching of a metal shaped-charge jet in the magnetic field of a long solenoid is considered. The purpose of the magnetic field influence on the shaped-charge jet is to slow down the development of plastic instability of the jet with an increase in its ultimate elongation and penetration ability. Using a number of simplifying assumpt...
Conference Paper
The implementation of ground-based modelling of high-speed interaction between objects when conducting studies of the behaviour of materials and structures under high-intensity exposure to various particles of natural and artificial origin is one of the urgent tasks in the development of spacecrafts nowadays. One of the methods for producing high-s...
Article
Studies of shaped charges with hemispherical liners of degressive thickness (decreasing from the top to the base) were continued based on numerical simulation. The possibility of increasing not only the velocity but also the mass of the head elements of shaped-charge jets to the level provided by conical liners of progressive thickness were analyze...
Article
X-ray research of particles formed during the explosion of a shaped charge with steel liner of the combined hemisphere-cylinder shape with a jet-forming part of a degressive (decreasing from top to base) thickness and a cylindrical part is carried out. It was experimentally confirmed that the transition from the constant to the degressive thickness...
Article
In this paper, we present the results of numerical simulation of explosive formation of a high-speed compact element from copper, steel, and aluminum cumulative liners combining the shape of a hemispherical segment smoothly converting into a cylindrical surface (“hemisphere–cylinder” liners). The problem is solved in a two-dimensional axisymmetric...
Article
Full-text available
The possibility of using cumulative charges for the destruction of the ice cover is considered. On the basis of experimental researches and numerical calculations, the features of the penetration of a cumulative jet into an ice obstacle, as well as the nature of the destruction of ice in the zone of the through hole formed, are analysed. In this ca...
Article
The study analyzed thermal effects at stretching of metal shape-charge jets caused by the longitudinal magnetic field in their material. The magnetic field amplifies in the course of stretching and generates circulation of vortex electric currents in a jet with production of Joule warmth. It is supposed that magnetic field in a jet is inherited fro...
Article
The influence of the geometric parameters of variable-thickness steel disk workpieces on the wall thickness of cylindrical shell parts with a spherical bottom, which are produced by lead stamping, is experimentally studied. The found laws of changing the dome thickness and the edge thickness of stamped parts allowed us to make recommendations for d...
Article
Full-text available
On the basis of numerical modeling within the two-dimensional axisymmetric problem of continuum mechanics and experimental studies, the features of the formation of high-speed compact elements using cumulative charges with liners of the combined form have been analysed.Such liners may have a jet-forming part in the form of a hemisphere, a slightly...
Article
Particle flows formed from shaped charges with a combined steel liner consisting of a hemisphere and a cylinder with a hemispherical part of degressive thickness (decreasing from top to bottom) were investigated by flash radiography. It has been found experimentally that the change from a constant to a degressive thickness of the hemispherical part...
Article
Full-text available
On the basis of numerical simulation within a two-dimensional axisymmetric problem of continuum mechanics the study shows that transition from the constant thickness of hemispherical shaped-charge liners to degressive thickness (decreasing from top to the basis) makes it possible to essentially increase the velocity of the formed shaped-charge jets...
Article
Full-text available
In this article we study the influence of material porosity on penetrative action of the powder shaped-charge jets formed during the explosive collapse of the liners pressed from metal powder. We employed numerical modeling within a two-dimensional axisymmetric problem of continuum mechanics. It allowed us to research the features of elongated poro...
Article
Accumulation of microdamages as a result of intensive plastic deformation leads to a decrease in the average density of the high-velocity elements that are formed at the explosive collapse of the special shape metal liners. For compaction of such elements in tests of their spacecraft meteoroid protection reliability, the use of magnetic-field actio...
Article
The formation of high-velocity compact elements of shaped charges with a liner of a combined hemisphere–cylinder shape has been analyzed by numerical simulations of a two-dimensional axisymmetric problem of continuum mechanics. This liner jet generator contains a part of a hemisphere, a truncated sphere or a slightly prolate ellipsoid and a cut-off...
Article
The formation of shaped-charge jets from hemispherical copper liners of degressive thickness (decreasing from apex to bottom) is analyzed by numerical simulation of a twodimensional axisymmetric problem of continuum mechanics. The comparison was based on the parameters of the jet formed from a modern standard shaped charge with a conical liner whic...
Article
This paper presents an analysis of the possibility of increasing the ultimate stretching and penetration capability of metallic shaped-charge jets in the presence of an axial magnetic field in the shaped-charge liner due to heating and thermal softening of the jet material as a result of a sharp increase in the magnetic-field induction in the jet f...
Article
Tto improve the efficiency of electrical action on metallic shaped-charge jets, it is proposed to use shutdown of the capacitive storage at the time when the voltage on it during passage of an alternating discharge becomes zero. It has been shown that using this expedient eliminates recharging of the capacitive storage and provides better matching...
Article
Full-text available
The formation of high-velocity compact elements of shaped charges with a liner of a combined hemisphere-cylinder shape has been analyzed by numerical simulations of a two-dimensional axisymmetric problem of continuum mechanics. The influence of the radius and thickness of the hemispherical portion of the combined liner on the parameters of the comp...
Article
Full-text available
The article presents the calculation-and-theory-based research results to examine the possibility for using the jet thrust impulse to increase a penetration depth of high-velocity penetrator modules. Such devices can be used for studies of Earth surface layer composition, and in the nearest future for other Solar system bodies too. Research equipme...
Article
Full-text available
The possibility to increase the depth of penetration of high-velocity research probes into soil targets due to imparting an additional jet thrust impulse to them during the penetration is considered. The analytical solution to a problem of non-deformable penetrator movement in the resisting matter is derived on the assumption about instantaneousnes...
Article
Full-text available
The cavity formation behind cylindrical bodies with variously shaped noses moving in water at velocities from 400 to 2000 m/s is investigated by numerically simulating a 2D axisymmetric gasdynamic problem under the assumption of an ideal compressible liquid. With regard to calculation and experimental data, a simple model of the process is proposed...
Article
Full-text available
The possibility of creating a device to protect entities against effects of shaped charges is a nalyzed. The device proposed works by passing a strong electric current through the shaped charge jet, which leads to its destruction and decreases penetration depth. The computational procedure used takes into considera tion such effects as development...
Article
Full-text available
The extension of metallic cumulative jets, through which an intense electric current pulse is passed, is numerically simulated in the framework of the model of a uniformly elongating cylindrical rod. Emphasis is on the radial scattering of the jet, which is observed after it escapes from the interelectrode gap. The influence of the magnetic energy...
Article
Full-text available
The influence of compressibility on the fast penetration of long metallic strikers into different barriers at interaction speeds of up to 10 km/s is investigated. The investigation is based on the hydrodynamic theory of penetration. Compressibility-related corrections to Lavrent'ev's rate and depth of penetration, which were obtained in terms of th...
Article
Full-text available
Computational and experimental techniques to determine the dynamics of nondeformable or slightly deformable striker penetration into soil obstacles are presented. One of the computational procedures is based on using empirical relationships for finding mechanical stresses on the striker-obstacle contact surface; the other, on the numerical simulati...
Article
This paper deals with electromagnetic actions that allow one to control the shaped-charge effect at different stages of shaped-charge operation. A decrease in penetration of the shaped-charge jet is attained by production of an axial magnetic field in the shaped-charge liner immediately before shot, and production of a magnetic field in the conduct...
Article
The goal of current work was prediction of obtained growth in shaped charge jet's effective length under different parameters of magnetic field influence. Investigations were carried out based on numerical modeling. For determination of magnetic field influence on the deformation character of different parts of a jet, a axisymmetric conductive rigi...
Article
The present paper considers the possibility of using external magnetic fields for the antiterrorist protection of various objects against shaped-charge action by means of their magnetic screening - the creation of a magnetic field in the space ahead of the object being protected from attack. The results of experimental and numerical investigations...
Article
Full-text available
By means of numerical simulation in the framework of the 2D axisymmetric problem of continuum mechanics, the penetration of elongated porous strikers into a steel obstacle under hydrodynamic conditions (the velocity of the striker at collision is several kilometers per second) is studied. It is found that the penetration depth of these strikers exc...
Conference Paper
The present paper considers the possibility of using magnetic fields for the antiterrorist protection of various objects against shaped-charge action by means of their magnetic screening — the creation of a magnetic field in the space ahead of the object being protected from attack. The results of an experimental and numerical investigation of the...
Article
Summary form only given. In recent years, much attention of researchers working in pulsed energy and high magnetic fields has been focused on searching for new applications of pulsed power and high magnetic fields in the protection against shaped-charge weapon. The present paper considers the possibility of using magnetic fields for the antiterrori...
Article
Full-text available
The possibility of reducing the penetration capability of shaped charges by producing a magnetic field ahead of the target with flux lines parallel to the charge axis is considered. The problem is studied on the basis of results of experiments in which a magnetic field was produced in a shaped-charge liner before firing, resulting in a sharp reduct...
Article
Full-text available
The formation of cavities in firm soil by penetration of one-piece or segmented metallic penetrators moving with a velocity of 3–5 km/s is numerically simulated in terms of the two-dimensional axisymmetric problem of continuum mechanics. It is shown that the cavity can be made more than twice as deep by segmenting an elongated one-piece penetrator....
Article
Full-text available
The motion and state of soil at the interface with a penetrating rigid projectile is studied by numerical solution of the problem of a cylindrical projectile which expands and at the same time moves translationally along its axis in soil. The soil behavior is described using the model of a compressible elastoplastic medium with transition to a plas...
Article
Full-text available
The accumulation of microdamage due to intense plastic deformation results in a decrease in the average density of high-velocity elements formed by explosive compression of shaped metal liners. For compaction of such elements in tests of the reliability of meteoroid protection, it is suggested that the elements be exposed to a magnetic field produc...
Article
Full-text available
This paper considers magnetic-field amplification in inertially elongating metal shaped-charge jets formed by explosion of a shaped charge with an axial field previously produced in the charge liner. The amplification is related to the effect of magnetic-field freezing in a conducting material and is due to the deformation of the jet material with...
Article
The paper reports results of experimental and numerical studies of the disruption of metallic shaped-charge jets (SCJ) through which a pulsed electric current is passed. The action of an electric current leads to a significant change in the jet "structure" and a decrease in the time required for jet disruption that, in turn, decreases the cavern de...
Article
Results are presented of acceleration of metal plates by the magnetic field of a plane inductor experiencing a current impulse from a capacitor bank. Two models of acceleration by magnetic fields have been used. The first model is based on the application of finite relation of the transient process theory and the conservation laws. The second model...
Article
The influences of a longitudinal axis-symmetric magnetic field on a metal, shaped charge jet stretching are considered. Magnetic fields were varied in time to allow for diffusion into the jet material. Theoretical investigations have shown that jet stretching with a diffused magnetic field is accompanied by magnetic field compression inside the jet...
Article
Full-text available
Experiments on creating an axial magnetic field in the metallic sheath of a shaped charge immediately before explosion are reported. Under such conditions, the penetrability of the charge is shown to decrease substantially. For instance, the penetration into a steel target is reduced more than twice when the initial field in the sheath is several t...
Article
Full-text available
A method for evaluating the penetrating (piercing) power of shaped charges under the condition when an intense electric current pulse is applied to a shaped charge jet is developed. The buildup of waist-type MHD instability and the volume damage of the jet material are viewed as possible mechanisms behind a reduction of the penetrating power of a s...
Article
Full-text available
This paper considers the generation of a longitudinal magnetic field between rigid conducting layers of different electrical conductivity which are in shear motion at constant velocity across the flux lines of the initial field. The amplification limits for the generated field due to the finite thickness of the conducting layers are established. Th...
Article
Full-text available
Magnetic field generation in shear flows of an incompressible viscous conducting medium across the flux lines of the initial Magnetic field generation in shear flows of an incompressible viscous conducting medium across the flux lines of the initial field created in them is considered in the framework of the plane 1D problem of magnetohydrodynamics...
Article
Full-text available
The effect of preheating of liners on the penetration capability of shaped charges is considered theoretically. It is shown that for a plastically fractured shaped-charge jet, preheating of the liner generally increases the effective jet length and shaped-charge jet penetration. Restrictions on the parameters of preheating of shaped-charge liners d...
Article
Full-text available
It is shown that when a high–velocity impactor penetrates into a conducting target with a transverse magnetic field, conditions for considerable field amplification are produced in the shear deformation region on the lateral surface of the impactor. Field generation in a conducting medium deformed in shear is considered within the framework of a pl...