Материалы. Технологии. Инструменты, 2001, Vol.6, No.4
/ Издания академии / Научные журналы
Материалы. Технологии. Инструменты, 2001, Vol.6, No.4
Volume 6, Number 4; October--December, 2001
СОДЕРЖАНИЕ
MECHANICS OF MATERIALS AND CONSTRUCTIONS
Bosakov S. V, Tarasevich A. N., Guenfoud S.
Influence functions for basic models of the soils of foundations. pp. 5--8
Summary: In this paper, the influence functions of the basic models of foundation's soils are presented in the form of simple formulas. These formulas are adopted without any difficulty for their application by the engineers.
Gromyko Yu. V.
Natural oscillations of three layer ring elastic plate. pp. 9--12
Summary: It is given formulation of initially edge problem. It is obtained transcedental equation for original numbers and built fundamental system of original ortonormal functions. It is made numeric investigation of natural oscillation frequences for plate fixed by internal and external contours.
Karavashkin S. B.
Peculiarities of inclined force action upon ID homogeneous elastic lumped line and related modernisation of the wave physics equations. pp. 13--19
Summary: Exact analytical solutions for 1D elastic lumped line under external force affection inclined to the line axis is analysed. It is shown that in this case an inclined wave being described by implicit function propagates along the line. These conclusions were extended both to free vibrations in the line and to distributed-parameters line vibrations. The solution in the form of implicit function is proved to be a generalising one for the wave equation. The vector of flux divergence in dynamical fields also is analysed. Exact account of dynamic processes leads to the conclusion that the divergence of vector in dynamic fields is not zero but is proportional to the scalar product of given vector partial derivative with respect to time into the wave propagation direction vector.
Orlov S. A.
Elastoplastic bending of sandwich ring plate. pp. 20--23
Summary: A formulation of boundary problem of bending of sandwich ring shaped plate bending is given. In case of elastic plastic materials analytic solution is suggested in iterations. Numeric realisation of solution for three layer plate fixed at internal and external outlines is made.
Chernous D. A., Petrokovets E. M.
Bar models of structure and elastic characteristics of foam plastics. pp. 24--28
Summary: The work is devoted to comparative analysis of methods for predictions of elastic characteristics porous materials with small relative density Vf. It was established the statistical method describes well enough experimental data at Vf. At smaller Vf elastic characteristics may be estimated more exactly using bar models of material structure. Analysis of the model was camped out by the method of separation of structure unit. A model with ordered packing of 14-faces cells gives the best fit of experimental data.
MATERIALS
Golub V. M., Pleskachevsky Yu. M.
Wear-resistant coatings based on various grain size powders of tungsten carbide for working surfaces of friction pair rings of face seals. pp. 29--32
Summary: The investigations of wear-resistant coatings based on tungsten carbide and copper-containing matrix have been conducted. The coatings are applied on working surfaces of friction pair rings of face seals by the methods of powder metallurgy. Structural transformations occurring in steel during heating arid cooling were found to effect quality of the wear-resistant layer. Investigation results are cited in the structure and phase content of the composite layer.
Kostomarov S. V., Il'yushchenko D. A.
Microstructure and physical properties of semiconducting ceramics Ba1-x-y-zCaxPbzYyTiO3 based of chemical precipiteted barium titanate. pp. 33--36.
Summary: The research of properties of PTCR termistor ceramics Ва0.98-x-yСаxРb0.02YyTiO3 (0 £ x £ 0.16; 0.004 £ y £ 0.006) with the components of MnO and SiO2 synthesized from chemical besieged Barium Titanate (ВТ) is carried out. It is established that at the optimum doping by yttrium the concentration dependences of a specific resistance, the magnitudes of a resistance saltusand and the electrical strength have an extreme character. The ceramics properties dependence on synthesis temperature is investigated.
Kuznetsov Yu. N., Kal'ba E. N., Savchuk P. P., Red'ko R. G.
The two-layer epoxypolymericly composition coverage for colletses mechanisms of clip. pp. 37--40
Summary: In operation the composition of an epoxy polymeric matrix for use in colletses mechanisms of a clip is optimized with the purpose of magnification of a rigidity of a clip of preforms and endurance of conjugated surfaces collets. On a foundation of experimental researches the possibility of the directed regulating is justified adhesion - hardness of properties of aggregates at updating acalibration epoxy ED-16 allifatations by resin DEG-1, and also damping properties at use of plastifier SKN-26. The two-layer polymericly composition coverage consisting of an extinguishing oscillation and wear-resistant stratums is developed its adhesion performances of hardness and are investigated.
Rogachev A. V., Popov A. N., Kazachenko V. P., Sidorsky S. S.
Mechanical properties and structure compound carbon coatings. pp. 41--45
Summary: Mechanical properties and structure of carbon films (multilayer and titanium doped). Carbon films were deposited by a pulsed are discharge method. The influence peculiarities of titanium concentration and coatings structure onto hardness and tribotechnical properties of coatings are determined.
Samuseva L. V., Neverov A. S.
Compatibility of polyethylene with carbomide and its derivative. pp. 46--48
Summary: The study of compatibility of nitrogene containing organic connections with polymers represents a significant interest, as many of them have an inhibiting action in relation to corrosion of metals. The polymeric materials containing such organic inhibitors, are perspective for use as sheetings and films. The industrial let out inhibitors are unsufficiently well compatible (composed) to polymer and their application for these purposes ist not always possible. We investigate systems PE-carbamide and PE-tiocarbamide. The feature of crystallixation create these low-molecular of organic connections the preconditions for formation of cluster type connection consisting of carbamide crystals or its derivative and low-molecular components of polymer. It may be probable that the opportunity of such interaction of examined systems components can expand a range of their compatibility. Research of such systems by methods of thermal and special analysis has shown, that the area of existence of homogeneous firm solutions for them is extraordinary wide and makes up to 15--20% of filler (carbamide and tiocarbamide). It confirms the stated assumption and makes such structures rather perspective for use with the purposes of anticorrosive protection of metal products.
Sedlyarova S. N., Eliseeva I. M., Lin D. G.
Effect of the crosslinking agents and lowmolecular substances on characteristics of field-performance rubber sealants. pp. 49--52
Summary: The loss of protective stability of rubber sealants, which used in liquid hydrocarbons by higher temperatures, first of all, is connected to destruction of a superficial layer of rubber. The ordering of process of modification of rubber intended for engineering parts which are realized as at a stage of vulcanization of rubber, and after its and is carried out. The authors offer new variants of modifying sealants, using additional crosslinking of superficial layer of rubber, and also saturation of this layer protective low-molecular modifiers. As an example the experimental data confirming high efficiency of such processes are given.
Frolov I. S., Ivashchenko S. A., Mrochek Zh. A.
Study of adhesive strength of ion precipitated coatings on steel base. pp. 53--56
Summary: Abstract adhesion of ion-plasma electric arc coating was discovered. Technical parameters which influence the adhesive strength of coatings were stated. Also recommendations on coating formation with the highest adhesive strength are given.
Yakimtsova L. B., Polikarpov A. P., Krul' L. P.
Effect of molecular mass on production and properties of polyacrylamide hydrogels. pp. 57--61
Summary: The effect of polycrylamide molecular mass on the formation of the 3D polymer structure in its aqua solutions has been studied at radiation mixing. Magnitude of water absorption of hydrogels at such mixing has been also examined. Decreasing molecular mass of polyacrylamide from ca 106 down to 104 due to increased concentration of the redox system at synthesis was found out to be accompanied by augmenting inorganic ion content of admixtures and incremented initial dose of gel formation. The limiting value of gel traction is independent of the molecular mass of polyacrylamide. Hyrogels with the maximum water absorption were obtained from the polymer whose molecular mass was ca 104. The formation of gel fraction is preceded by the preliminary structure formation of the polymer inducing shear of the thermomechanical curves to the region of higher temperatures. Hydrogels from the low-molecular polyacrylamide might be employed as the basis for manufacturing novel medicinal forms.
TECHNOLOGIES
Bordusov S. V.
Constructive peculiarities of the unit and technological processes of UHF plasma treatment of materials in low vacuum. pp. 62--64
Summary: Constructive peculiarities and technical characteristics of multifunctional small-dimensional plasma unit for material treatment are given. The unit is intended for rough plasmachemical treatment of microelectronic, electronic, optic, etc. devices. For example, the unit provides threefold energy reduce while photoresist removing in relation to one Æ100 mm silicon wafer with simultaneous treatment acceleration 2-3 folds in comparison with industrial unit "Plasma-600Т".
Vlasova G. M., Makarevich A. V.
Technological peculiarities of insecticidal biodegradable polyethylene-based films production. pp. 65--70
Summary: Results a re discussed of investigation aiming to production technique development of insecticidal biodegradable polymer films based on plasticized starch-polyethylene compositions. Formulation, temperature and rheological parameters of the process have been optimized by a complex of most significant film performances (strength, biodegradability, insecticidity, etc.)
Grinkevich I. V.
Vibration transportation of ferromagnetic powders at electromagnetic hardfacing. pp. 71--74
Summary: A scheme of electromagnetic vibratory hopper metering device is described. The main factors influencing powder feeding, namely time of operation of the device and composition of the powder by grain size have been analyzed. The effect of transformations taking place in loose bodies under vibration on operation stability of the metering device have been investigated.
Zlotnikov I. I., Kudina E. F., Piskunov S. V.
Influence of micro-arc oxidation on adhesion of polymers to aluminium. pp. 75--77
Summary: The influence of preliminary processing of aluminium coating was investigated by the method of micro0arc oxidation on adhesive strength of polymeric coatings to aluminium substrate. The perspective of the use of such processing by creating layered metal-polymer materials was considered.
Kovalevskii A. A., Kovalevskaya V. A. †, Sorokin V. M.
Features of etching of silicon nifride films in a hot ortophosphoric acid. pp. 78--80
Summary: The features of etching of silicon nitride films in hot ortophosphoric acid in the closed adaptations with a return refrigerator are investigated. It is shown, that the rate of etching of silicon nitride films into an ortophosphoric acid depends on conditions of their formation and conditions of process of chemical etching.
Moiseenko V. L., Nevzorova A. B., Vrublevskaya V. I.
Research of process of shrinkage of wood in bearings of sliding. pp. 81--85
Summary: The design of installation for high-temperature impregnation of the wood loose leaf of the bearing of sliding is developed. Optimum modes of modifying are determined. Negative influence of quantity removing the connected moisture is revealed at high-temperature impregnation on a degree of filling of wood and the technique of definition of actual quantity of an absorbed lubricant is offered.
Sleptsova M. I.
Development of the technology of production collars applying extra high frequency electromagnetic field. pp. 86--89
Summary: Development of the technology of production of collars from rubbers B-14, B-14-1 and 7В-14-1 based on butadiene nitrile rubber SKN-18. The technology implies combination of traditional methods of rubber vulcanization using ordinary equipment followed by processing in extra high frequency electromagnetic field. It was shown that suggested method of the collar production provides the reduction of production time and growth of the collar frost resistance.
Chernaya N. V., Lamotkin A. I, Emello G. G., Zholnerovich N. V.
The influence of the drying regime on the properties of paper which is sized. pp. 90--93
Summary: It is shown when the paper sized in neutral medium the optimal temperature of drying barrel in the zone of baking is 10 °C below than for sour-sized paper.
Zozko V. I., Burya A. I., Kholodilov O. V.
Gas-flaming decarbonating of cast-iron. pp. 94--97
Summary: The decarbonate effect of gas flame of a weld burner on the surface layer of gray cast iron is studied. The local processing of the cast iron by acetylen-oxyden flame or by hydrogen-oxyden one is performed. The additional influence of a constant electric field or the processing surface is applied. The clear decarbonate effect is obtained only under the hydrogen-oxiden flame. The diffusion nature of the process is established.
INSTRUMENTS AND TEST METHODS
Klimovich L. N.
Automated complex to estimate loading on joints in agricultural machinery. pp. 98--100
Summary: Developed by the author structural system of automated measurement complex is described in the work. The system makes it possible to fully automate processes of measurement, accumulation and processing of obtained information at testing agricultural machnies. An algorithm of measurement complex functioning is presented and its operation is described. Use of the method of frequency-digital conversion has proved to raise quality of the measurement till about 0.03%.
Heinrich M., Lenkiewicz W.
The investigation and estimation of tribological pair reliability at the initial period of an object operation. pp. 101--103
Summary: The process of investigation and estimation of tribological pair reliability in the period of initial operation of a single object is presented in the paper. Friction pairs are frequently wearing and ageing in a shorter time then it was predicted and therefore they should be modified in design-manufacturing processes following the real operational conditions. An estimation model is proposed which enables: estimation of design solution in real operational conditions; relative estimation of each modification. As a result of tests and modifications introduced into design-manufacturing solutions the investigated object has achieved a required level of quality
JUBILEE
Anatolyi Vlasovich Chigarev (60th anniversary). p. 104
Contents volume 6 (2001). pp. 105--107
Author indexes. p. 108
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Designed and maintained by Dr. Nikolai N. Kostyukovich. Last update May 3, 2002
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2002 The National Academy of Sciences of Belarus
Copyright © 2001 Materialy. Tekhnologii. Instrumenty
