Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî Íàöèîíàëüíîé àêàäåìèè íàóê Áåëàðóñè, Ãîìåëü, Áåëàðóñü
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ÌÀÒÅÐÈÀËÛ. ÒÅÕÍÎËÎÃÈÈ. ÈÍÑÒÐÓÌÅÍÒÛ Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî Íàöèîíàëüíîé àêàäåìèè íàóê Áåëàðóñè, Ãîìåëü, Áåëàðóñü |
Summary: Free and forced harmonic vibration of are analyzed. Equalization for approximate solution for oscillation amplitudes near resonance is obtained. Computational investigation of appropriate solution for circular trilaminar cylindrical shell is conducted as an example
Summary: In scientific work new data on electrophysical properties of composites with functional components and physico-chemical principles of their formation to make their properties applicable as elements of absorbing media are presented. Model and experimental investigations of electrodynamic properties of polymer composite materials with electrical and magnetic anisotropy are presented. Dielectric and magnetic properties were modelled using percolation theory and effective medium theory. Synthetic dielectrics from conducting fibers in polymeric matrix are analysed from the point of view of their efficiency as electromagnetic wave absorbers. A theoretical model is presented, which describes the properties of these materials. The most efficient filler is conducting fibers, coated with insulating layer, which allows to increase concentration of fibers without appearance of bulk conductivity in composite. The work presents results for gel-spinned tilled fibers trom UHMWPE and anisotropic hexaferrite fillers with particles size 150--400 microns and filler volume fraction up to 60%. Just drawn fibers are considerably porous and possess rather low tensile strength The influence of additional deformations at elevated temperature on magnetic texture, electrodynamic and mechanical properties of fibers was investigated. During this treatment ferrite particles become oriented in polymer matrix, with vector of magnetic moment assuming preferential direction, either in the plane of the fiber or normal to it. so that the fibers become magnetically textured. Measurements of electrodynamic properties in frequency range 4--40 GHz shows, that textured structures are superior to isotropic ones in this respect (a review).
Pleskachevsky Yu. M., Shurinov V. A., Zlotnikov I. I., Solovei V. F.
Polymeric composite materials in constructions of agricultural machines. pp. 23--28
Summary: Performance characteristics of composite materials developed at Metal-Polymer Research Institute of NASB are presented at operation in working members of agricultural machines, automobiles and tractors. Data are cited on peculiarities of materials used in friction joints (plan bearings, brake units, clutches, etc.), sealing and sound-absorbing units. Special attention is paid to the experience on employment of novel materials at "Gomselmash" Production Amalgamation.
Bogoslovsky A. A.
Rheological properties and structural peculiarities of high-viscous polyamide compositions. pp. 29--31
Summary: Blend compositions of ÐÀ6/functionalized polyolefin were prepared and tested to be processed by continuous extrusion and blowing extinsion methods.
Dolinskaya R. M., Migal S. S., Rusetskii V. V., Shcherbina E. I.
Heat ageing of thermoplastic compositions based on rubber SRI-3 and PEHP. pp. 32--34
Summary: The objects of research were thermoplastic compositions on the basis of multitonnage rubbers and polyolefin's using the methods of mechanical mixing and "dynamic vulcanizations". The purpose of the work was lo investigate the factors influencing the structure and the properties of thermoplastic compositions on the basis of rubbers and polyolefin's as well as to develop compositions and technology of production of a range of products on their basis. The behavior of the compositions under the conditions of thermal aging was researched and the temperature intervals of their operation were defined.
Kashevich I. F., Shut V. N., Syrtsov S. R.
The materials with positive temperature coefficient of resistivity on base of polymer electroconductive composites. pp. 35--38
Summary: There were conducted the research of electrical-physical characteristics of composition materials on base of polymer (polyethyl-ene)-conductor (Ni) composite. That was shown the efficiency of using such systems in devices of radio-electronic apparatus's protection from current overloading. The most PTCR (40%/°C) was possessed by the materials with the Ni concentration of 25%. That can be explained by the coincidence of the temperature of percolation phase transition with the temperature the polymer matrix melting in the composites with the noted concentration.
Krakodeev D.V., Krul' L. P.
Polyelectrolytic hydrogels on the basis of products of an alkaline hydrolysis of polyacrylonitrile fiber. pp. 39--43
Summary: Influence of solution concentration of acrylamide potassium acrylate and sodium acrylate copolymers, nature and concentration of impure ions and pH-value of the medium upon polyelectrolytic hydrogels forming process at exposure to ionizing radiation and obtained products water-absorbing ability is investigated. The copolymers is obtained at hydrolysis of acrylic fiber nitron S with potassium hydroxide and sodium hydroxide aqueous solutions and consequent neutralization of hydrolyzate. It is shown, that removal of impure ions improves efficiency of copolymer radiation cross-linking that leads to gel obtaining and provides obtaining of product with high swelling index at considerably smaller doses (20--30 kGy). The factors which lead to copolymer macromolecules transition from straightened conformation to coagulated one (solution concentration increment, pH-value decrease) resist to gel forming at radiation cross-linking and lead to raising of doses which is required for obtaining of product with high water absorbing.
Mamonchik A. I., Skaskevich A. A., Struk V. A., Kholodilov O. V.
The anticracking stability under the pressure of small filled polyolephines, modified by high dispersible powder. pp. 44--46
Summary: The anticracking stability of composites on the base of small filled polyolephines was investigated. The mechanism of raising of the anticracking stability under the static pressure, consist of the forming a spatial net of labial physical nodes in volume of polymer, was shown.
Mironovich L. L., Gartman E. V, Lin D. G.
Technological inheritanse of cryogenicallyatomized polyethylene terephthalate. pp. 47--50
Summary: Investigations have been performed into the effect of thermal regimes on the processes taking place in cryogenically atomized polyethylene terephthalate (PETP) at coating formation. With this aim differential-thermal analysis (DTA), differential scanning calorimetry (DSC) and optical microscopy have been used. Temperature intervals of these processes have been determined. As a result of investigations conducted it has been established that low-molecular products of mechanical destruction formed at cryogenic atomizing of PETP were the first to undergo thermal oxidation and destruction.
Petrashenko P. D., Mel'nikov S. F., Levin I. A.
Modification of thermosetting components by thermoplastic powders. pp. 51--53
Summary: Interaction of powdery thermoplasts and thermosets nave been investigated. As a result of interaction, viscosity of thermoset melt increases while setting time decreases by 30%. It has been found out that modification of thermosetting composites based on phenol phormaldehyde resins by thermoplastic powders leads to elevated fluidity and ensures increased 1.5--2 times strength of materials obtained at low specific molding pressures.
Chekhomova L. F.
Composition optimization of modifying agents of oxide of chromium for polish. pp. 54--59
Summary: The regularities of modifying Cr2O3 by oxide Ca2+ and Zr4+, which are caused by the formation of hard solutions, are discovered by the methods of Ro ntgen phase analysis, chemical phase analysis and granularmeter. The possibilities of mathematical design of experiments were considered for the determination of optimal concentrations of modifying agents (CaO, ZrO2) of oxide of chromium is utilized for the polish of high precise products of machinery. Granulometric composition of products from steel SHX-15 (luring polish is determined.
Summary: There were investigated the particularities of laser modifying of the surface structure of NiCrFe -- 50 ìàñ.% Ñr3C2 plasma coatings. The coatings of 200--800 µm thickness were processed by the YAG:Nd+3--laser (l = 1.06 µm) the beam of which was moving along their surface. The laser processing carried out under conditions of the surface's melting resulted in the decrease of coatings' porosity (from 0.56 down to 0.20) and to the increase of their homogeneity in microhardness (without the noticeable change of microhardness as a whole). With the decrease of radiation power density in the impulse of freguency of impulses' repetition, the thickness of the melted layer was drowing up to the complete melting of the coatings. At this the coating's destruction was not observed.
Shilova O. A., Khashkovskii S. V.
Sol-gel, method of reception composition glassy and glassceramic film on basis inorganic polymer. pp. 64--70
Summary: The modern performances about processes film-forming in sol-gel systems based on tetraethoxysilane modified with inorganic additives and high disperse fillers are generalized and are advanced. The set of the requirements to properties of soles and disperse systems, and also to properties of both the polymeric and silicate films formed is formulated. The observance of these requirements is necessary for successful use of the films in microelectronics and electrical engineering. The chemical and technological aspects îf synthesis of such soles and disperse systems are considered. The influence of conditions of drawing, modes of heat treatment and material of a substrate on properties the films received is analyzed. The possibility of application of sol-gel method of film reception in various industries is shown.
Gorlenko O. A., Malashenko V. M., Malashenko N. A.
The influence of cutting conditions on power inputs for drilling. pp. 71--76
Summary: The influence of feed and cutting speed on specific energy consumption tor drilling is researched. Some recommendations to reduce power inputs at 15--20 per cent on average are given.
Dubinskii M. A.
The influence of conditions of electrolysis on properties composite materials produced by electrochemical methods. pp. 77--79
Summary: The physical-mathematical models for determination of the strength, porosity and growth velocity of the composite materials produced by electrochemical method under unstationary conditions of electrolysis have been developed. The suggested models gives a possibility to estimate the coating characteristics that agree well with the experimental data.
Kudina E. F,Tyurina S. I.
Influence of physical-chemical modification on wettability of offset rubber surface. pp. 80--83
Summary: Effect of physico-chemical modification on wettability of offset cloth surface layer has been studied. Most efficient methods of modification have been determined and processing technique for offset rubber treatment has been developed to improve wettability of offset cloth.
Mamedov V. A., Mamedov A. V.
Peculiarities of flat periphery grinding of sintered parts based on iron powders. pp. 84--87
Summary: Influence of porosity on the process of flat outlying grinding is considered. It was shown that the surface of a powder metal part consists of a series of flats and pores of different sizes. Presence of pores on the surface of powder part results in creation of additional clearance between abrasive cutting particles and detail's material. This in turn results in improvement of conditions of allocation and ejection of cutting shaving from processed zone and reduction of abrasive wheel wear.
Markevich M. I., Chaplanov A. M., Podol'tsev A. S.
The oxidations of thin films by laser multiples heating. pp. 88--90
Summary: Physical and mathematical model of the oxidation of thin metal films by pulsed laser annealing is proposed. The mechanical of laser enhanced thermomechanical oxidation of metal films has been studied.
Summary: With the purposes of refinement of experimental technique of the electret-thermal analysis, increase of accuracy and efficiency of the measuring equipment the computerized measuring complex with high noise immunity, supplied by software, is developed. In the article the system of experimental data acquisition, system interactive environment, set of visualization means and graphic user interface is described. The capabilities of registration of input data spectra are shown. Is shown, that the new visualization means allow to ensure a reliability of the interactive information in the graphic shape in Windows 95/98 environment.
Petrovskii V. P., Kul'geiko M. K., Grinkevich I. V., Rogov S. V.
Work stabilization of driving gear plant to electromagnetic building-up. pp. 97--101
Summary: Special equipment muff for the technology effective realization are fescribed.
Shalamov I. V, Pinchuk L. S., Ukhartseva I. Yu., Tsvetkova E. A.
Electrophysical monitoring method of liquid disperse systems. pp. 102--106
Summary: The possibilities of the experimental device ADS-1 intended for the study of liquid disperse systems by electrophysical method are discrided. Their principle of operation and technical characteristics are reported. Structure and properties of drilling solutions, polymeric gels and biological liquids are investigated using this device.