bluuebunny/crossref_metadata_2025 huggingface dataset:
Another Implementation of Efficient Recoding Circuit for Signed Digit to Residue Canonical Signed Digit on Modulo 2n-1
Authors: Tanaka Yuuki
Published: February 2019

In this paper, we propose an efficient SD-to-RCSD recoding circuit structure on modulo. This structure is based on the parallel prefix addition circuit, that is, a carry for each digits is precalculated in parallel.
Development of Flux Cored Wire Using Concentrates and Mining Industry Waste Products in the Far East
Authors: Makienko V.M. , Leont’ev L.B. , Sokolov P.V. , Atenyaev A.V.
Published: February 2019

The paper considers the problem of the development of new flux cored wires manufactured from concentrates and waste products of the mining industry of the Far Eastern Region. The authors provide the results of the analysis of the phase and chemical compositions of mineral raw materials, and experimental research. We have developed diagrams that offer a selection of different compositions of charge mixtures depending on the properties demanded from the weld deposited metal. We have also developed a flux cored wire for deposit welding of the automatic coupling locks of the rolling stock that ensures the hardness of the weld metal 500 НВ retaining high parameters of notch toughness (impact strength).
Sludge of the Fuel-Energy and Oil-Producing Complex in the Production of Wall Ceramic Products
Authors: Guryeva Viktoriya A. , Doroshin Aleksandr V. , Dubineckij Viktor V.
Published: February 2019

The experience of using slime wastes in the production of wall ceramic bricks is considered. The results of the investigation of clayey raw materials in the deposits of the Western Orenburg region and technogenic wastes of the fuel-energy and oil-producing complex are analyzed with an analysis of their effect on the properties of wall ceramics: density, strength, and water absorption. Based on the results of the research, optimal compositions were developed using ash and slag wastes in a composition with aluminosilicate clay raw material - loam. The influence of drill cuttings with an increased content of calcium oxide on the composition and physical and mechanical properties of wall ceramics, the effect of a composition of low-grade local clay raw materials and drill cuttings on the formation of the structure and properties of ceramic materials is shown. The analysis of the volumes of formation of ash-and-slag wastes and drill cuttings is given, which makes it possible to introduce technogenic wastes into secondary production and to expand the mineral and raw materials base for the production of ceramic bricks.
Evaluations of Efficiency of the Use of Amorphous Alumosilicates in Dry Mixes
Authors: Zhegera K.V. , Pyshkina I.S. , Martyashin Georgiy Victorovich
Published: February 2019

The article presents the results of the market research of dry mixtures produced in the Russian Federation. The established that glue dry construction mixes are in great demand. Information on the main produced glue dry mixes presented in the Russian market presented. The formulation of tile glue containing amorphous aluminosilicates as a modifying additive developed. The established that the synthesized aluminosilicates have a high activity equal to 350 mg/g. It has been established that samples of cement-based tile adhesive are characterized by high adhesion strength, which is more than Rkog = 1.4 MPa and Radg> 1.1 MPa. In the article carried out the estimation of technical and economic indicators of production of the adhesive dry mixes. The shown that the developed formulation of glue dry mixes is economically efficiency.
Fibers and their Properties for Concrete Reinforcement
Authors: Klyuev Sergey V. , Khezhev T.A. , Pukharenko Yu.V. , Klyuev A.V.
Published: February 2019

The necessary fiber content in the first place is determined by the requirements of bending strength and resistance to dynamic loads. The fiber content depends on the composition and consistency of concrete, fiber properties and mixing techniques. The most widespread types of fibers, their advantages and disadvantages, possible areas of their application are considered. Fibers whose modulus of elasticity is greater than the modulus of elasticity of a concrete matrix, such as steel fibers or glass fibers, increase the workload on the cracks.
Fine-Grained High-Strength Concrete
Authors: Lukutsova N.P. , Soboleva G.N. , Golovin S.N. , Chivikova E.V. , Ogloblina E.V.
Published: February 2019

The factors determining the production of fine-grained high-strength concrete are considered. The effect of micro-and complex nanodisperse additives based on natural mineral components, as well as the packing density of the quartz aggregate, on the strength parameters of fine-grained concrete is studied. The compositions of the fine-grained concrete modified by micro-and complex nanodisperse additives have been developed. The dependence of the fine concrete strength on the ratio of the mineral component and the stabilizer in the nanodisperse additive and the time of ultrasonic dispersion and additive storage is analyzed. The stabilization mechanisms of water dispersions of complex nanodisperse additives by various surface active modifiers are considered. The positive role of ultrasonic dispersion in obtaining nanodispersed additives is shown. The application efficiency of the micro-filler improving the density and strength of fine-grained concrete is revealed. The structure of fine-grained concrete is studied. It has been established by scanning electron microscopy that the introduction of the micro-and nanodispersed additives in the concrete leads to a less defective crystalline structure of the material.
Improving Performance of Water-Reducing Admixtures by Modification of Quartz Sands with Electrolyte
Authors: Rakhimbayev S.M. , Tolypina N.M. , Khakhaleva E.N.
Published: February 2019

It is widely known that modern anionic surfactants are adsorbed at positively charged active centers of hydrate phases in portland cement that leads to floccules decomposition as well as a release of immobilized water, therefore increasing cement paste flowability. Normally, in cement based concrete such fine and coarse aggregates as quartz sand, granite, sandstone etc. are used. They contain negatively charged active centers, therefore, are inert to anionic water-reducing admixture and don’t affect fluidization of cement based concrete mixture. For instance, quartz sand with high concentration of fine particles as well as oxides and hydroxides of Al and Fe cations demonstrates a higher reactivity to anionic water-reducing admixtures. In order to increase the efficiency of anionic surfactants in concrete mixtures the treatment of aggregates with salts based on two-and three-valent cations was proposed. That provides a higher concentration of positively charged active centers on quartz sand surface leading to increase of flowability of concrete mixture.
Increasing the Weathering Resistance of Asphalt by Nanomodification
Authors: Inozemtcev Sergei Sergeevich , Korolev Evgeniy V.
Published: February 2019

The comparative analysis of quality indicators of asphalt concrete and methods of their control is discussed in the present article. Classifications of modifiers for improving the quality of asphalt concrete are given. Novel nanoscale modifier for the improvement the resistance to climatic influences on asphalt is developed. The nanomodifier is based on sols of iron hydroxide and silicic acid. Nanomodification consists in processing of the mineral component by nanomodifier; such processing leads to the formation of nanoscale layer on the surface of the mineral carrier. As a mineral carrier we propose a highly porous mineral diatomite powder. The influence of the nanomodifier on the weathering resistance of asphalt concrete is investigated. Resistance to climatic influences was estimated by loss of strength after one nominal year of exposure. To simulate environmental impacts, an environmental chamber was used. The specimens were held in conditions that correspond to combination of summer and winter climate. One nominal year of exposure included 10 cycles of variable water saturation-drying at a temperature of 20 °C and 10 cycles of freezing-thawing (freezing was performed at –20 °C, thawing – at 20 °C). Saturation-drying and freezing-thawing duration was four hours. It was shown that by means of nanomodification the weathering resistance can be increased by 36 %.
Arctic Building Material Reinforced by Composite Lattice Structure
Authors: Razin A.F. , Babichev A.A. , Skleznev A.A.
Published: February 2019

The issue of ice reinforcing by lattice anisogrid composite structures is considered in order to obtain new materials for Arctic use. The results of laboratory tests of breadboard models are obtained, the possibility of using an ice-composite construction material in conditions of the Far North is shown in principle. The questions of applicability of a new type of structures and possible directions of further research are touched upon.
Regulation of Requirements for Quality Indicators of Paint Covering
Authors: Loganina Valentina Ivanovna , Karpova O.V.
Published: February 2019

We adduce the information about methodology of decision-making on conformity of quality of the painted surface of building products and constructions to the established requirements. General methodology consists of obtaining, analyzing the facts on the normalized indicator and calculation and establishment of the norm.When calculating the allowed value of the adhesive strength can be determined for 3-σ deviation from mathematics expectation. The maximum permissible values of average-quadratic deviation should be determined by standard value coefficient of variation. Formulas are given for determining the permissible value of the coefficient of variation. The normative values of the coefficients of variation for some protective and decorative coatings are given
Structural Transformations of Cement Stone in Conditions of Development of the Biocenosis of a Poultry Enterprise
Authors: Strokova Valeria V. , Zhernovsky Igor V. , Nelyubova Victoriya V. , Rykunova M.D.
Published: February 2019

The results of the investigation of phase structural transformations of cement stone as a result of the influence of the aggressive environment of the poultry farm are presented. Analysis of the change in the phase composition of cement stone samples showed that according to the average content of C3S increase in the increase of degree of hydration is represented by the sequence: zone I (air medium with minimal aggression) - zone III (wet environment with maximum concentration of active substances) - zone II (air zone with periodic aggressive action). The degree of carbonization, depending on the test conditions of the samples, is characterized by a similar zonal dependence. In this case, the removal of CaO during the acid leaching of the peripheral regions of the samples was detected to a greater extent during testing in zones II and III.
Technologies for Manufacturing of Moisture-Resistant Products from Modified Wood
Authors: Shaikhutdinova Aigul Ravilevna , Safin Ruslan R. , Voronin A.E.
Published: February 2019

Wood, as a finishing and building material, has always been given special attention. Wood has many positive properties, but it's no secret that faced with its shortcomings such as fragility, instability of form and susceptibility to decay, people often prefer synthetic materials, putting aside the ecology and useful properties of wood and choosing the long life of non-natural materials. In this regard experts around the world are constantly searching for new solutions aimed at improving the physical, mechanical and operational properties of wood, which would allow a person to limit the use of artificially created analogs of natural materials and enjoy the atmosphere of tranquility and appeasement in a house that can create a tree. Analyzing the knowledge and skills of previous generations the author of the article took as a basis various technologies of deep processing with the aim of improving the quality, extending the service life and expanding the scope of its use, thanks to which a new modern moisture resistant "hardened" tree is created for furniture, interior, finishing elements for garden houses and plots. Experiments have been carried out to investigate the biological resistance of wood thermo modified in five different technologies: vacuum-convective thermal modification in a superheated steam, convective thermal modification in a saturated high-pressure steam environment, thermal modification of wood in hydrophobic liquids, thermal modification of wood in a flue gas environment and vacuum-conductive thermal modification. The degree of moisture resistance of the samples is calculated, which makes it possible to conclude that the mass of thermo-modified wood is significantly lower, caused by the destructive effect of fungi, as compared to untreated samples. The most optimal technology for structures involving close contact with water or soil is determined.
The Development of Composite Nanostructured Gypsum Binder with Enhanced Heat Resistance Performance
Authors: Cherevatova Alla V. , Zhernovsky Igor V. , Kozhukhova M.I. , Alehin D.A.
Published: February 2019

The subject of this study was an experimental confirmation of stability of composite nanostructured gypsum silicate binder (CNGSB) system under high-temperature exposure (up to 1000 °C). The hypothesis of the heat-resistance performance of gypsum-based binder was crystallization process in CNGSB system involving a silicate constituent as a reactive component in NB. XRD and DTA analyses demonstrated that thermal exposure of CNGSB to wide range of temperatures of 20–1000 °C leads to α-quartz to β-quartz phase transformation in the binder; amorphous alkali-aluminosilicate (gel) changes to crystal phase of Са-albite. The calculation of cell volumes characteristics for low-temperature (before thermal exposure) and high-temperature (after thermal exposure) phases was performed. The calculated ratios of unit cell volumes were close to 1 which ensures a structural stability of the GNB under thermal exposure and confirms its heat-resistant performance.
Activity Improvement of Sticky Portland Cements by Methods of Mechanical Activation
Authors: Andreeva A.V. , Burenina O.N. , Savvinova M.E.
Published: February 2019

The article presents experimental data on the improvement of physical and mechanical properties and structure of fine-grained concrete by mechanical activation of sticky cement in various apparatuses. It is established that the use of mechanoactivation technologies allows controlling the surface characteristics of cement in a wide range, its granulometric composition, as well as the physical and mechanical characteristics of concrete products. It is revealed that the efficiency of grinding machines that realize various mechanisms of disperse action is not the same. The highest indexes belong to the concrete containing cement, which is mechanically activated on the planetary ball mill AGO-2.
The Peculiarities and Possibility Mechanical Compaction by Tamping of the Active Layer in the Cryolytozone
Authors: Semenova N.
Published: February 2019

The use of shallow and surface foundations without changing the properties of the active (seasonally thawed) layer is impossible. The ground of the active layer may be improved for used as a base in the cryolitozone. To reduce the thaw settlement ability and avoid active layer frost susceptibility a well-known technique of ground compaction by tamping may be used. This paper presents the peculiarities and possibility the properties of the active layer improvement.
Determination of Permissible Stresses along the Stiffened Hole Outline in Designs of Anisotropic Composite Materials
Authors: Vashukov J.A. , Klimov E.A.
Published: February 2019

Technique of determination of permissible compressive stresses in products made of anisotropic composite materials with holes in joints “parent sheet - stiffening element” is introduced. Besides, physical-mechanical properties and material load factor are taken into account. Finite-element model to determine stress strain behavior along the hole outline and in the ”field” points of composite material has been developed.
Dynamic Testing of Magnetic Elastomer Material Prototypes
Authors: Minaev A.J. , Korovkin J.V.
Published: February 2019

This research is aimed at obtaining the experimental dynamic characteristics of new materials (magnetoactive elastomers exposed to the magnetic field). It demonstrates that the strength of a magnetic field has a considerable effect on the increase in the resonant frequencies of tested materials. For tests, we used a vibration stand equipped with virtual meters to visualize the experimental results on a computer display. We herein present an example of recording the frequency response on the magnetic elastomer sample input and output when exposed to vibrations caused by the unbalanced motor forces.
Development of Composite Materials Based on Ultrahigh-Molecular Weight Polyethylene and Thermally Expanded Graphite
Authors: Gogoleva O.V.
Published: February 2019

In connection with the huge range of ultra-high molecular weight polyethylene (UHMWPE) grades, the choice of a particular brand is a difficult task. Rational choice of the polymer matrix is a necessary condition for the increase in reliability and service life of products, and consequently, for the efficiency of using these composite materials. The given article presents the results of tests on stress-strain properties of GUR-2122, 4113, 4120, 4130, 4150, 4170 and GHR-8020 ultra-high molecular weight polyethylene grades. GUR-4150 UHMWPE is chosen as the polymer matrix on the base of the test results. It is shown that the friction coefficient of the polymer composite material is reduced even with the modification of UHMWPE with nanodispersed thermally expanded graphite (TEG) in amount of 0.001-0.5 mass%. It is established that the rate of mass wear decreases by 3-4.3 while maintaining the stress-strain properties of the composites at the level of the initial UHMWPE. Polymer composite materials with an improved set of performance indicators are developed.
Effects of Nanomodification by the Silicate Nanoparticles on Characteristics of Basalt Fibre Reinforced Polymer
Authors: Kychkin A.K. , Vasilyeva A.A.
Published: February 2019

Composite material represents a complex multi-material structure consisting of coincidence array and reinforcing agent. Basalt continuous fibre and basalt composite material processing technique is one of the present day promising area. With all high characteristics of basalt fibre and basalt made products the ways of it refinement are nowhere near exhausted and one of that ways is nanomodification of the binding agents used in composite production. In this paper quoted the results of the silicate - type nanoparticle retooling influence on mechanical and physical properties of epoxianhydride binding for the purpose of lifting strength and viscoelastic properties of basalt fibre composite. It is found that the appliance of the silicate nanoparticles in epoxianhydride binding between 0.25 to 1 mass. % improve stress-related properties per 10-45%, micro plastics interlaminar shear strength increase by 25-28%, increase of dynamic modulus of elasticity - 30%, mechanical and physical properties of basalt fibre reinforced polymer based on nanomodified binder - 20%. Conducted research efforts show transmission of increased characteristics by nanomodification of epoxianhydride binding onto the characteristics of basalt fibre composite materials.
Polyfunctional Materials Based on Collagen Hydrolysate Obtained from Swim Bladders of Northern Fish Species
Authors: Ivanova S.F. , Petrova Natalia N.
Published: February 2019

In recent years biopolymer fillers are widely used to development of composite materials for various purposes. In this respect collagen hydrolysate (HC) is one of the most promising biopolymer for modification of synthetic polymers to produce different types of item. In this work, a new source of collagen has been tested - collagen hydrolysate obtained from a swim bladder of northern fishes. The cure characteristics, mechanical and relaxation properties, abrasion resistance of the Butadiene–acrylonitrile rubber composites containing the collagen hydrolysate have been discussed. The chemical compositions, properties, morphology of collagen hydrolysates have been studied. It was shown by means of IR spectroscopy that the bands of Amide I, Amide II, Amide III, Amide A, which is related to the vibrations of the polypeptide bond of the protein, are recorded in the infrared spectra of the samples. The morphological structure of collagen was investigated by scanning electron microscope JSM-7800F ("JEOL", Japan). The size and the zeta potential of collagen hydrolysate were investigated by Dynamic Light Scattering (DLS) on the Zetasizer nanoZS instruments (Malvern Instruments Ltd., UK).
Microwave Modification of Polymer-Carbon Materials
Authors: Zavrazhin D. , Zavrazhina C.
Published: February 2019

Studies of microwave radiation on polymeric materials have shown the possibility of modifying the characteristics of materials. At the same time, the efficiency of the microwave effect can be increased by introducing into the polymer matrix electrically conductive particles (carbon, metal particles, etc.). In this case, the absorption coefficient of the microwave waves is greatly increased. The paper evaluated the physical and mechanical properties of polyamide 6 subjected to microwave exposure. To intensify the microwave, well-proven carbon nanotubes were used, which were added to the polymer in small amounts. The most effective was the addition of carbon nanotubes in an amount of 1 wt%. The data obtained are changes in strength under tensile, Shore D hardness conditions, as well as thermophysical characteristics (heat resistance and change in the specific energy absorption rate in the melting zone of the samples). Microwave can be used as a modifying radiation, and as a method of heating polymers for subsequent molding in products. This method significantly reduces the technological process of obtaining materials and products with improved performance characteristics.
Research of the Resistance of Reinforced Polymeric Composite Materials to Hydro-Abrasive Action
Authors: Antoev K.P. , Popov S.N. , Shadrinov N.V.
Published: February 2019

The results of the research of the resistance of reinforced polymeric composite materials to hydro-abrasive action are presented. Hydro-abrasive wear research was carried out on a specially developed device that makes it possible to study the wear resistance of materials and coatings under impact conditions of loosely suspended abrasive particles simulating the flow of a hydro-abrasive medium. Composites based on polyester resin and polyurethane reinforced with ultra-high molecular weight polyethylene (UHMWPE) fibers and glass fibers were chosen as the objects for the study. An analysis of the intensity and nature of wear of these composites in compared with structural steel, UHMWPE and polyurea was carried out.The analysis of the obtained research results shows that UHMWPEis the most resistant to hydro-abrasive effects. However, the high cost and variation of the traditional technology of manufacturing composite products using UHMWPE as a lining material shows the advantage of using composite materials reinforced with oriented UHMWPE fibers.
Selection of Reinforcing Agent in Metal Composite Matrix and Study of its Particle Composition
Authors: Safonova M.N. , Fedotov A.A. , Syromiatnikova A.S.
Published: February 2019

The problem of creation of new materials and performance characteristics increasing of known matrix composite alloys is an actual target of research in materials science and engineering. It is known that the application of dispersed fillers, including ultra-and nanoscale dimensionality materials in the composites is an effective way to solve this problem. The article describes the feasibility of application ultradisperse powders of natural diamond as a reinforcing agent instead of synthetic in composite materials on a metal base and study of its particle composition.
The Effect of Surface Active Substances on the Mechanical Properties of a Copper-Matrix Nanocomposite
Authors: Shchetinin Y. , Kopylov Y. , Zhirkov A.
Published: February 2019

The presented work reviews the research in the field of production of nanostructured composite materials based on copper, reinforced with carbon nanostructures. Particular attention is paid to the use of composites with high thermal conductivity as structural materials. The method of manufacturing a composite material based on copper is described in detail: modes of preliminary annealing, pre-pressing, hot isostatic pressing. The characteristics of the matrix and alloying components are given, and also preliminary treatment of copper powder and carbon nanotubes is described. Different mechanisms of component mixing are considered, the process of mechanical alloying in a planetary mill is described in detail, the results of measuring the thermal conductivity of samples are given. The mechanical characteristics of the samples are considered in detail: ultimate strength, yield strength, elongation. The degree of influence of surfactants on the uniformity of the distribution of alloying components and the mechanical properties of the composite material is determined.
The Influence of Modified Additives on Dynamic Properties of Polymeric Materials Based on Ethylene-Vinyl Acetate
Authors: Volotskoy A.N. , Yurkin Yuriy V. , Cherkasov V.D. , Avdonin V.V.
Published: February 2019

The article deals with the problem of creating vibration damping polymeric materials with high damping properties in a wide temperature range. The purpose of the article is to study physical-mechanical properties of composites based on ethylene-vinyl acetate by adding various modifiers in the form of resins. The main method to investigate this problem is the method of dynamic mechanical analysis, which makes possible to obtain viscoelastic properties of polymeric materials under the influence of an oscillating load at various temperatures and oscillation frequencies. Due to the established experimental dependencies, the authors have determined the type of resin, which improves the damping properties and increases the stiffness of the composites based on ethylene-vinyl acetate. Moreover, the authors have defined the limit of working capacity of composites with resins at negative temperatures.
Analysis of the Sheet Shell's Curvature with Lame's Superellipse Method during Superplastic Forming
Authors: Anishchenko O.S. , Kukhar V.V. , Grushko A.V. , Vishtak Inna , Prysiazhnyi A.H. , Balalayeva E.Y.
Published: February 2019

The prospects and novelty of using the expression of Lame's superellipse for approximating the curvature of shells in superplastic forming (SPF) and for predicting the geometry of a product are shown. Different versions of the SPF facilitate the realization of different radii of curvature of the shell contours, which differ significantly from the radius of the spherical segment. The regularities of the change in the radius of conjugation of the bottom and the wall of the spherical shell for various SPF variants are established.
The Influence of High-Frequency Cyclic Loading on the Mechanical Properties of Steel
Authors: Gridasova Ekaterina A. , Nikiforov Pavel , Loktev Alexey
Published: February 2019

The modern development of high-speed transport causes a requirement toughening of the safety requirements for rolling stock and upper track components. Researchers and constructors are actively working towards the creation of more complete and adequate models of constructers and their elements, as well as new materials for their manufacture. The problem of studying traditional materials in various modes of rolling stock operation, including increasing the frequencies of dynamic influences and imposing effects from various loads and oscillations to the high-frequency area, becomes relevant and timely. This work is devoted to modeling the influence of high-frequency loading on a sample made of rail steel, this kind of influence takes place when rolling stock passes through an artificial constructer. It is assumed that the work of the rail within the sleepers step is described by the laws of uniaxial tension-compression. Experimental results and conclusions on ultrasonic high-frequency cyclic tests and structural analysis of the model material - low-carbon steel of the perlite class are presented.
Assessment of the Adequacy of the Definition of Cutting Forces for the Purpose of Minimizing Energy Consumption in Machining Processes
Authors: Kondrashov A.G. , Safarov D.T. , Kazargeldinov R.R.
Published: February 2019

Minimizing energy consumption in the processing of parts on metal-cutting equipment is most effective at the stage of designing the content of operations. Important in this process is the precise determination of the initial parameters - cutting forces. This parameter allows you to plan both energy consumption and perform additional calculations for the deformation of the tooling and workpiece in order to predict the geometric accuracy of the machined part. The article presents the results of experiments on measuring the circumferential cutting force during milling operations of an aluminum alloy workpiece with an end mill. The measurements were carried out by an indirect method - by recording the electrical power on the spindle and then calculating the circumferential cutting force. Theoretical analysis of the methods of calculation of cutting forces showed significant differences between the results obtained by domestic methods and recommendations of world manufacturers of cutting tools. Statistical analysis of the results of calculations based on reference data and measurements made it possible to assess the adequacy of the known methods for calculating cutting forces in order to minimize energy consumption in operations of processing parts on metal-cutting equipment
Construction of a Generalized Fatigue Diagram of Metallic Materials
Authors: Bashkov O.V. , Popkova A.A. , Gadoev G.A. , Bashkova Tatiana I. , Solovev Denis B.
Published: February 2019

The paper presents the results of the study of the stage of accumulation of damage and fatigue rupture of titanium alloys (using the method of acoustic emission). The main object of research was the development of a method for designing a generalized fatigue diagram characterizing the stage of fatigue damage accumulation. The studies aimed at experimental verification of the hypothesis of the stage of damage accumulation, which can be established only by the registered parameters of acoustic emission with separate analysis by types of acoustic emission sources. In contrast to the method of research, which is carried out fractographic analysis, the use of acoustic emission method can significantly reduce the amount of testing. The types of acoustic emission sources on the distribution plane of two-parameter “AE signal energy EAE vs. frequency parameter Kf” are considered. Fatigue stages in the tests of trial alloys were determined by the activity of the AE signals emitted by different types of AE sources (dislocation, micro - and macro-cracks). A generalized diagram of fatigue developed according to the specified stages. The developed method significantly reduces the volume of fatigue tests and fractographic studies.
Effect of Particular Combinations of Quenching, Tempering and Carburization on Abrasive Wear of Low-Carbon Manganese Steels with Metastable Austenite
Authors: Malinov L.S. , Malysheva I.E. , Klimov E.S. , Kukhar V.V. , Balalayeva E.Y.
Published: February 2019

The effect of quenching from 900°C (20 min exposure) and different tempering in the 250-650°C (for 1 hour) interval, as well as additionally preliminary carburization for 8 hours at 930°C, followed by a similar heat treatment on abrasive and shock-abrasive wear of low-carbon manganese (10-24%Mn) steels, phase composition and mechanical properties was studied. It was confirmed that an increase in the manganese reduces the abrasive wear resistance and increases the impact-abrasive wear resistance. The expediency of carburization of low-carbon manganese steels is shown in order to obtain the residual austenite in the structure which amount and stability must be optimized in relation to specific abrasive impact characterized by the dynamic ratio with taking into account the chemical composition.
Working Body for Deformation of Thin-Walled Pipe Billets
Authors: Maryin S.B. , Aung Phyo Wai
Published: February 2019

In this paper we consider different types of working bodies and fillers used in the manufacture of hydro-gas systems of aircraft from thin-walled pipe billets, and also explored the advantages and disadvantages of liquid, fusible, solid, elastic, loose and combined fillers in the deformation of pipe segments by means of distribution, crimping, forming and flexible. As a result of the research, a device for distributing pipe billets along a rigid matrix and a working body made of granular polyurethane and ice, the main advantages of which are: good rheological properties (fast flow); high ductility and viscosity; high ability to transfer pressure throughout the metal zone; ability to withstand high compression load; ease of entry into the workpiece and removal from the finished part; low production costs.
Research of Heat Input in Friction Stir Welding
Authors: Statsenko V. , Sukhorada A. , Bernvskaya M.
Published: February 2019

Nowadays the most perspective, high-tech and productive process is friction stir welding. The most important part of this technology is to determine the temperature of the material in the stir zone. This parameter is easily counted by the amount of the heat input, put in the welding zone. We made experimental researches about the relation of the heat input, therotation speed and thediameter of the working tool. For that purpose an experimental scheme was chosen, which models a welding material (aluminum alloy AMg5) as an experimental tube 20 mm in diameter. The tool (shear steel P6M5) is modeled as a working plate. Measurements of the frictional moments depending on the rotation speed of the experimental working tube during the constant temperature are made on the prepared stand. By the experimental data the specific heat input and the heat power were counted on every concentric ring, 2 mm in width, in the end of the working tool, 20 mm in diameter. Also, the sum of the heat power for the whole tool during various rotation speed terms was counted too. On the stand throughout the experiment were determined all the thermal conductivity heat losses along the rod, which the experimental tube was pinned on, all the working plate heat losses through the gasket towards the working desk and the convection from the surface of the rotating experimental tube to the environment. According the data, any of these losses is from 3 to 10 percent. This is shown in the heat input counting.
Development and Investigation of High-Strength Neutron-Absorbing Composite Coatings Based on Borides of Metals
Authors: Larionov A.S. , Chekushina L.V. , Suslov E.E.
Published: February 2019

At present, structural materials capable of absorbing thermal neutrons are used for long-term, compacted storage of spent nuclear fuel. This is necessary to prevent the occurrence of a fission reaction in clusters of nuclear materials. A promising direction in this area is the use of neutron-absorbing coatings. In this paper, it is proposed to use coatings of the B-Ti system for this purpose. The model calculations carried out using the MCU-REA program show the sufficient effectiveness of such coatings. The average path length of the neutron in the coating is ~ 90 μm. The dependence of the degree of attenuation of the neutron flux on the thickness of the coating is shown. Calculations show that the main role is played not by the thickness of the coating, but by the boron concentration in the material. For the synthesis of coatings, the method of magnetron sputtering is considered. Аn experimental magnetron boron-containing target for a four-channel magnetron installation VUP-5M was fabricated.
Efficient Technological Control of the Processing of Bearing Rollers
Authors: Vainer L. , Gamolya U.
Published: February 2019

In the article the strategy and algorithm of technological control of the process of bilateral abrasive processing of cylindrical bearing rollers are considered. The main variable control parameters of the process are the parameters of the angular position of the grinding wheels, the size of the removed allowance and the feed rate of the workpieces. As a result of complex theoretical and experimental research, control principles, criterial conditions, functional and parametric constraints are formulated. The solution of the problem of synthesis of control parameters is given. The effectiveness of the technological control is confirmed by production tests and is expressed in increasing the accuracy and productivity of processing rollers.
Experience and Perspectives of Electrodeposition from Electrolytes-Colloids of Nickel Plating
Authors: Degtyar L.A. , Zhukova I.Y. , Mishurov V.I.
Published: February 2019

The investigation and use of colloid-electrolyte baths from the time of first, publications had proceeded mainly in the field of working out highly efficient baths with low concentrations of electrolytes in connection with acute ecological necessity, saving energy and profit. We call briefly colloid-electrolytes such plating baths, where metal deposits are formed by reducing not only metal ions but also colloids and fine dispersions of this metal compounds. This dispersions in the field of the cathode (in the part of diffusion layer where the rate of stirring usually tends to zero) may be treated in certain optimal cases as the systems of mobile pores, giving rise to electrokinetic phenomena, equilibrium and nonequilibrium and thus to efficient stirring this part of diffusion layer, difficulties of the electrochemically reacting species transfer through which are the main obstacle for the cathode processes intensification. It results in reducing or eliminating the diffusion control and gives the essential rise of the limiting current densities. There was observed in some cases for chloride colloid electrolytes the correlation between decrease of polarization in comparison with conventional baths and degree of operating current densities increase. In chloride solutions colloids and fine dispersions, especially protected ones, are more stable than in solutions, where multi charged anions prevail. The polarization's decrease in chloride electrolytes was investigated also. We tend to explain the referred to phenomena by lessening the diffusion control in presence of mobile pore's systems of reducing to metal at the cathode colloids and fine dispersions of that metal's compounds.
Functional Galvanic Coatings of the Cr-Zn System
Authors: Fomichev V.T. , Savchenko A.V. , Gubarevich G.P.
Published: February 2019

The authors have studied the influence of the electric current density, temperature, electrolyte composition on the properties of electroplating Chromium-Zinc deposits. The dependence of the maximum yield of metal on the physico-chemical characteristics of the solutions for electroplating of Chromium and Cr-Zn alloy has been shown. Chromium-Zinc coatings have been obtained from electrolytes based on chromic acid in the presence of organic additive (4-methylaminophenol). Abrupt nonlinear changes in density, viscosity, surface tension, specific electrical conductivity due to structural transformations in electrolytes are observed at the concentration of zinc sulphate of 4070 gramm / litr (further in the text - g/l), and the organic additive of 2-5 g/l. The obtained model has been applied to predict the optimal electrolyte compositions for the processes of Cr-Zn alloy formation, which will allow reducing the research efforts concerning the electrochemical studies of the given process when chromic acid solutions are used. The coatings exhibit high hardness, corrosion resistance, wear resistance, low internal stresses.
Investigation on Producing the Flux Cored Wire Modified with Concentrated Complex from Tomtor Mineral Assets
Authors: Kychkin A.K. , Vinokurov G.G. , Struchkov N.F.
Published: February 2019

Multiple use of pan concentrate from placer deposits directly in technical process without prealltoment of pure components could become one of promising directions in the field of receiving wide range of multicomponent metal and ceramic powdered materials. In this paper as the object of comparative examination, we present the hemimethylated plating made of exploited experimentative flux cored wires based on industrial Ni-Cr-B-Si system powder modified with rare-earth elements of concentrated complex from Tomtor mineral assets Republic of Sakha (Yakutia). The structure of received plating is heterogeneous and has oxidation coating as boundaries. According to the data of the phase shift analysis plating predominantly consist of Fe-Ni austenitic alloy phases with the Cr, Si carbide and Cr boride precipitation strengthening, plating generally consist of Al2O3, Cr2O3 и Fe2O3 oxide. The research of the plating ultimate composition testifies the equable allocation of main and alloying elements, local location of some elements in the structure of the plating. Microhardness of flux cored wire plating substantially depends on composition and fabricated structure. It has been established that the introduction of rare earth elements provided the formation of strengthening phase with the high hardness of plating resulting in wear resistance increase.
Production of an Electrolytic Alloy Nickel-Tin-Bor
Authors: Khramenkova A.V. , Shpanova K.A. , Ariskina D.N.
Published: February 2019

A method for the preparation and properties of an alloy based on nickel is discussed. An electrolyte for the deposition of a tin-nickel alloy has been developed. The influence of electrolysis regimes and electrolyte composition on the physical and mechanical properties (microhardness, spreading coefficient of solder, transient electrical resistance, coating ability to soldering, phase composition, porosity, adhesion, corrosion resistance) of an electrolytic coating based on nickel-tin alloy precipitated from a chloride electrolyte. The possibility of using a tin-nickel alloy as a solderable coating instead of gold and silver is shown.
Wear Resistance of a Composite Galvanic Coating Based on the Nickel-Cobalt Alloy
Authors: Arzumanova A.V. , Starunov A.V. , Shpanova K.A.
Published: February 2019

In modern engineering the great attention is paid to the creation and implementation of new electroplating coating to ensure the durability, hardness and corrosion resistance. One of the effective methods for improving the properties of composite coatings is the method of galvanic deposition. The principle of obtaining of the composite electroplating was based on the fact that together with the metals ion some disperse particles of different sizes and nature are co-deposited. By including into metal matrix the particles are improve the performance coatings and increase the reliability and durability of products. The chloride electrolyte for application of the wear-resistant composite galvanic coating of nickel-cobalt-silicon oxide system was designed. The influences of the electrolysis modes and the electrolyte composition to a physical mechanical properties of the coating (wear resistance, firmness to corrosion, micro-hardness, internal stress, porosity, adhesion) were investigated. The possibility of the usage of received coating as the firmness to corrosion material with anti-frictional properties was showed.
Features of the Structural-Phase State of the Diamond-Matrix Boundary Zone in Diamond-Containing Composite Materials
Authors: Sharin P.P. , Akimova M.P. , Yakovleva S.P.
Published: February 2019

Preliminary metallization of the diamond component, which promotes the formation of chemical bonds on the diamond-matrix contact during subsequent sintering, is used to increase the strength of diamond retention and the durability of diamond-containing metal matrix composites. There are restrictions on carrying out metallization to create diamond composites with a cemented carbide matrix, since reheating the metallized coating at high sintering temperatures of carbide powders leads to its destruction, diamond graphitization and deterioration of the material properties. The structural-phase state in the diamond-matrix contact zone has been studied and the main factors providing the strength of diamond retention in diamond-cemented carbide composites obtained by hybrid technology that excludes the reheating of the metallized coating have been revealed. It was revealed, that the developed hybrid technology combining the thermal diffusion metallization of diamond and sintering according to the self-dosed impregnation scheme in one cycle ensures the production and preservation of the metallized coating by the methods of scanning electron microscopy, X-ray diffraction and X-ray phase analysis, Raman spectroscopy. Comparative tests have been carried out and it is shown that the specific productivity of experimental samples of a diamond tool (ruling pencils) with a metallized diamond component is on 39% higher than same parameter of pencils without metallization.
Numerical Modeling of Thermal Stress State of "Shell Mold-Casting" System with Phase Change when Inverstment Casting
Authors: Odinokov V.I. , Sviridov A.V. , Dmitriev E.A.
Published: February 2019

This work summarizes and generalizes the results of long term researches of mathematic modeling of stress-strain state (SSS) of shell molds (SM) considering their morphological structure and types of hydromechanical and temperature impacts on them. A problem for determination of SSS of multilayer SM with internal porous layer during filling this mold with melt and mold hardening considering the phase changes was set and solved. At the same time the calculation methodology described in the early works of authors, namely constitutive equation system, numerical method, numerical scheme and solution algorithm was used. The results of numerical solution of the problem, namely diagrams of stresses arising in the SM during casting hardening are given here.
Effective Elements of Building Structures from Pipe Concrete
Authors: Sysoev O.E. , Dobryshkin A.Y. , Sysoyev Ye.O.
Published: February 2019

The article is devoted to the investigation of pipe-concrete prestressed structural elements with high efficiency. This is due to a more complete use of the strength properties of structural materials in the pipe-concrete beam. The article presents various methods for calculating pipe-concrete elements. The design of a concrete tube with a prestressed element using high-strength concrete is presented. The results of calculations of various designs are shown and the cross-sections of beams for perception of the same bending load are selected. A comparison is made between the consumption of beam materials of various designs. The effectiveness of the use of pipe-concrete elements for receiving bending loads made of high-strength concrete with prestressed reinforcement is shown in comparison with the construction of beams of traditional high-strength concrete, high-strength concrete pipe-concrete with no prestressing of reinforcement and metal beam, mass of the element, consumption of metal and concrete.