(Materials, Technologies, Tools)
Published by The Institute of Mechanics of Metal-Polymer Systems of the National Academy of Sciences of Belarus, Gomel, Republic of Belarus
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MATERIALY. TEKHNOLOGII. INSTRUMENTY (Materials, Technologies, Tools) Published by The Institute of Mechanics of Metal-Polymer Systems of the National Academy of Sciences of Belarus, Gomel, Republic of Belarus |
Summary: The paper describes the determination of the dynamic absorption coefficient in real oil-well. The knowledge of the absorption coefficient is necessary for solving fluctuation problems of the boring column under specific mechanisms control in the process of testing the oil-well with the help of the layer testers.
Novoselov Yu. A., Popok N. N.
The systematization and formalization of describing linear surfaces. pp. 8--12
Summary: The systematization of forming surfaces according to four degrees of freedom and coding of their possible variants have been carried out. Mathematical formulae describing linear surfaces widely-spread in engineering have been derived and the examples of their graphic models are given here.
Bondareva V. V.
Computer simulation of settlings of structures of piles on the nonlinear-deformable ground basis. pp. 13--16
Summary: Are developed a technique and software of visual object-oriented computer simulation of settlings solitary and group of piles on the inhomogeneous nonlinear-deformable ground basis. The effect of a cross-coupling of piles in structure on their settlings is defined. The approximated analytical method of solution of the task about settlings solitary and different groups of trailing piles on the nonlinear-deformable ground basis is developed.
Bosakov S. V., Semenyuk S. D.
Calculation of the cross girders system on the elastic wedge-shaped base. pp. 17--20
Summary: The calculation of the cross girders system on the elastic wedge-shaped base is offered to be made by B.N.Zhemochkin's approach. In calculating the coefficients of canonical equations of Zhemochkin's approach, the Ritza method is used. The Green function is constructed for the elastic wedge-shaped base. An example of calculation is given.
Summary: The paper describes determination of the deformation center and analyzes kinematics of the metal flow in a band at the rolling with the dragging between fast-rotating rollers.
Sklyar O. N., Bosyakov S. M.
Strong discontinuities in dynamic elastic theory of cubic anisotropic bodies. pp. 24--26
Summary: It was shown that surface of strong discontinuity in cubic anisotropic elastic bodies determined by three material constants is a characteristic for corresponding motion equation. Speed of propagation of the strong discontinuity surfaces in such bodies have been investigated.
Summary: The results of the research of structure formation of wear-resistant coatings of self-fluxing alloys on the basis of Fe--Cr--B--Si--C system at a laser surfacing are described. X-ray crystallographic analysis of the coating material has been performed. It is shown that the geometrical factor plays a key role in the coating surface layer hardening. The crystallization process of a thin layer of a coating melt is theoretically analyzed. The results of wear resistance test of coatings are presented.
Krul' L. P., Yakimtsova L. B., Matusevich Yu. I., Brazhnikov M. M., Brazhnikova L. Yu.
Copolymers of acrylamide with sodium acrylate as adhesives in a glass-paper system. pp. 33--38
Summary: A possibility to use a copolymer of acrylamide with sodium acrylate as a base for adhesives in a glass-paper system has been studied. An effect of chemical composition of the hydrolysis products of polyacrylamide and polyacrylonitrile fibre (nitron) on rheological and adhesion properties of the glues has been investigated. A strength growth rate of a glue compound has been shown to depend on aratio between acrylamide and acrylate groups in a polymer and on a content of inorganic admixtures in polymer solutions. A possibility to use hydrolysis products of polyacrylonitrile fibre (nitron) as a base for adhesives in glass-paper system has been shown. Hydrolysis products of polyacrylamide may be used as glues if the copolymer molecular weight is reduced to an optimal level.
Fedorov V. D.
Mechanical and dynamic properties of segmented polyurethane ester. pp. 39--42
Summary: Mechanical dynamic properties of thermoplastic polyurethane on oligoester base have been studied. Relaxation transitions have been considered in polymers homologues to rigid and flexible blocks. Presence of close values of quantum periodicity has been established for rigid and flexible blocks which leads to hybridization of a-, d-, a2 and ll-transitions, and one glass transition temperature, whose concentration dependence of block content meets Fox equation in respect to the polymer-homologue transitions. Elastic properties in the viscoelasticity plateau interval follow concentration dependence in the form of Devise equation which confirms the presence of dual phase continuity of the rigid and flexible blocks. The results is high elastic properties of thermoplastic polyurethane surpassing adaptive contribution of components.
Kudina E. F., Tyurina S. I., Grankin B. V., Meshkov V. V.
Effect of physico-chemical modification on offset rubbers performances. pp. 43--45
Summary: Effect of physico-chemical modification on service characteristics of offset cloth has been studied. Most efficient means of raising wettability, Shore hardness and tribological characteristics of offset rubbers have been determined. Influence of physico-chemical methods, time of exposure to high-energy radiation, concentration of organic reagents and method of microlayer formation on the offset cloth surface have been studied. Most efficient regimes of surface layer treatment have been determined.
Sedlyarova S. N., Eliseeva I. M., Lin D. G.
Effect of polymeric modifiers on performances of rubber sealants. pp. 46--48
Summary: Protecting polymeric coatings that give to rubbers intended for engineering parts high resistance to liquid hydrocarbon within the temperatures range 20-150 °C have been suggested and investigated. The coatings have satisfactory deformation-strength performances.
Usacheva E. Yu., Revyako M. M., Poluyanovich V. Ya.
Influence of the polymer matrix on structure and characteristics of compositions of foamed polyolefins. pp. 49--51
Summary: The compositions of polyethylene and ethylene and vinilacetate copolymer base were obtained and examined. The influence of the polymer matrix on structure and characteristics of integral polyfoam has been investigated. Nitrogen dicarbonamid was used as chemical blowing agent and the temperature of its decomposition was lowered with the help of decomposition activator -- zinc oxide. The obtained results showed the possibility to regulate the structure and characteristics of polyfoam by use of different polyolefines and by control over correlation of blowing agent and the activator of its decomposition.
Dubkova V. I., Burya A. I., Maevskaya O. I., Ermolenko I. N. †, Rahmangulova N. I.
Incombustible composites on the basis of element carbon fibres. pp. 52--54
Summary: Information on reception of polymeric incombustible composites on the basis of element carbon fibres is given. It was established that governing the processes on the fibrous filler-binding interface it is possible to obtain composites with a various level fire-protection (oxigen index of the materials can reach 100%). The characteristics of composites on the basis of thermoset and thermoplastic matrixes are given, and the options of their application are recommended.
Gaishun V. E., Tyulenkova O. I., Potapyonok Ya. A., Mel'nichenko I. M.
Sol-gel method preparation and propertis of polishing suspension on the basis of silicon dioxide for finishing the silicon monocrystal plates. pp. 55--57
Summary: The paper describes sol-gel process of preparation high-stabile polishing suspension on the SiO2 basis. Properties of the suspension are given.
Ustinovich D. F., Zaitsev A. V., Valendo A. Ya., Zubchenko N. L.
Investigation technological properties of abrasive diamond-containing composites based on modified phenol-formaldehyde resin. pp. 58--61
Summary: Abrasive diamond-containing composites based on a modified phenol-formaldehyde resin have been developed. At grinding the T15K6 hard alloy they allow 15-32% decrease in a specific diamond consumption as compared to grinding using a conventional nonmodified composite. The influence of the modifying agents content on the technological properties of the developed composites has been studied.
Kukui D. M., Odarchenko I. В.
Structure of activated bentonite binders. pp. 62--64
Summary: To establish mechanism of bentonite activation at its modification and hydromechanical processing of the suspension, structure of the mineral modified with synthetic water-soluble high-molecular compounds has been studied. It was revealed that the mineral dispersion and the polymer phase properties influence on the binding ability of the bentonite suspensions.
Sviridenok A. I., Bernatskaya Zh. I., Sechko A. E., Fridrieh K., Stavrov V. P.
Study of adhesion in the system fiber glass-polimeric matrix. Part 3. pp. 65--68
Summary: Adhesion in the system fiber glass-polymeric matrix has been studied with the techniques of determination of adhesion of single-fibers and fibers bunches. The influence of thermochemical processing of glass fibers on the adhesion strength has been investigated. The results of measuring adhesion strength of single glass fibers and glass fibers bunches to polyamide matrix are described.
Pinchuk L. S., Kravtsov A. G., Goldade V. A., Zotov S. V.
Electret-thermal analysis of blood. pp. 69--72
Summary: Thermally stimulated depolarization method intended for analysis of dielectric charged state was used for human blood research. Blood spectrum of thermally stimulated current on positive temperature area consists of three peaks. Hypothesis has been offered that low-temperature peak (40-50 °C) is determined by thermally stimulated destruction of hydrate shells surrounding blood components. More high middle-temperature peak (70-90 °C) corresponds to thermal denaturation of blood proteins. Most intensive peak (105-120 °C) is observed when phase transition of blood occurs. It is accompanied by thrombus-like mass formation. Position of high-temperature peak on temperature scale depends from blood group. Data was adduced testifying that blood electret effect is function and factor initiating biochemical processes in human organism. Thermally stimulated depolarization method can be used as simple and informative diagnostics means after complex of medicine-physical researches fulfilling.
Kupchinov B. I., Ermakov S. F., Rodnenkov V. G., Beloenko E. D., Eismont O. L.
Role of liquid crystals in biotribological properties of the joint synovial medium. pp. 73--79
Summary: The paper deals with the issue of low friction in synovial joints. Experiments have revealed that synovial fluids and their lipid extracts feature reversible phase transitions in the range of physiological temperatures. These data in combination with the resuits of thermopolarizing microscopy and thin-layer chromatography allowed to conclude that synovia comprises the liquid-crystalline cholesterol compounds. Their effect on the joint cartilage biotribological properties have been investigated. It is shown that alongside with the lubricant medium nature frictional interaction of cartilages is influenced also by their surface layer structure. An assumption is put forward that the liquid crystal compounds of synovia under the orientation effect of the collagen structures and microgrooves I between them form ordered lubricating layers with low shear stress on the cartilage surfaces. It results in minimum frictional losses at the cartilages relative motion and the experimantally observed medicative effect.
Summary: In the paper the problems of influence of ultrasonic oscillations on the drawing process, on the degree of form restoiration by wire from titanium nickelide possessing the shape memory have been investigated. It was shown that thermal processing of the alloy with a help of highspeed electric-contact heating is promising.
Kovalevskiy A. A., Sorokin V. M.
Formation of amorphous layers of silicon carbide at tetramethylsilicon decomposition. pp. 84--87
Summary: The process of tetramethylsilicon decomposition is investigated at formation of amorphous layers of silicon carbide in hydrogen flow. The obtained regularities allow to assume that the growth kinetics of amorphous layers of silicon carbide is determined by processes in an adsorbed layer on a substrate surface. It is shown that layers of silicon carbide obtained under all researched modes are amorphous. It is established that amorphous layers of silicon carbide deposited at the tetramethylsilicon contents in the gas flow above 0.25 vol.% have rather strong dependence of specific resistance and refraction factor on concentration of main component in the gas mixture. It is shown that temperature of deposition is one of major parameters at deposition of silicon carbide amorphous films at tetramethylsilicon decomposition.
Rusin N. M., Korosteleva E. N.
Particularities of activated sintering of aluminum by small additives of silicon. pp. 88--93
Summary: The possibility of achievement of high density of aluminum powdered alloys by sintering activated by small additives of silicon is considered. The liquid phase formed under sintering is assumed to be constantly present in powder body and to accelerate the processes of compaction and alloying. It was assumed that increase of sintering temperature accelerates the processes. The suggestion was confirmed by dilatometric investigations carried out for samples made from the mixture of elementary aluminum and silicon powder. Content of silicon in powder mixtures was 0.5--1.5 wt.%. The sintering was done in vacuum dilatometer at temperatures exceeding melting point of Al--Si system eutectic (577 °C).
Tartakowski Z., Shapovalov V. M.
Recycling of foam polystyrene. pp. 94--96
Summary: An efficient means of processing foam polystyrene recyclate is shown to be its sintering. An optimum qualitative content of foam polystyrene recyclate (up to 20 wt.%) in the blend with parent polystyrene has been determined. Their physical and mechanical characteristics have been studied aimed at selecting rational service conditions. The proposed formulation and processing technique make is possible to efficiently utilize recyclate of foam polystyrene in manufacturing heat insulating members of structural articles.
Polozkov Yu. V., Svirsky D. N.
The 3-D scanning technology and equipment in the compact rapid prototyping system. pp. 97--102.
Summary: Analysis of problems in design and technological preparation of a production showed the need of including the local 3D-scanning module in industrial rapid prototyping system. Known structural and technological solutions for 3D-scanning are investigated. The variant of an effective 3D-scanning module built on the video recording basis are proposed. The example of compact rapid prototyping system with 3D-scanning module is considered.
CONFERENCE CALENDAR. p. 103
Content of Vol. 5 (2000). pp. 104--107
Author indexes for Vol. 5 (2000). p. 108
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