Материалы. Технологии. Инструменты, 2001, Vol.6, No.1
/ Издания академии / Научные журналы
Материалы. Технологии. Инструменты, 2001, Vol.6, No.1
Volume 6, Number 1; January--March, 2001
СОДЕРЖАНИЕ
MECHANICS OF MATERIALS AND CONSTRUCTIONS
Stolyarov A. I.
Simulation of destruction process of porous frictional composites polymer matrix base. pp. 5--8
Summary: Destruction kinetics of composite materials with a polymer matrix has been studied. The stressedly-deformed state of the model structure of composite material is calculated based on a developed algorithm for describing processes of microcrack initiation and propagation. Effect of initial porosity and residual stress on the composite strength is analysised.
Rak A. L, Mazyuk V. V., Pilinevich L. P.
Calculations and optimization of pore structure of filters of metallic powders. pp. 9--15
Summary: The theoretical basis for optimization of pore structure of filters manufactured of metallic powders is stated. The aim was to get the greatest impurity capacity and working resource at a given clearing extent. The efficiency of the formation of pore structures with variable cross-section porosity for improving the complex of filters working properties is shown.
Mitenkov M. V.
Research of lap thermal deformation at operational development of optical surfaces at the expense of a temperature variation of polishing slurry. pp. 16--19
Summary: The influence of temperature of polishing slurry on machining accuracy of optical surfaces have been studied at different rotational speeds of the lower link at finishing by laps with different cross-section profiles. The guidelines on improvement and implementation of temperature-controlled finishing of optical surfaces are given.
Popok N. N., Novoselov Yu. A.
Regulation of ways of a part surface shaping by cutting on the base of generalized notion on surface forming. pp. 20--23
Summary: General notions about surfaces formation are given. On the example of forming cylindrical surface of a part, options for machining are presented as a combination of shape line and lines of its changes. Advantages and disadvantages of separate ways are given from the viewpoint of quality and precision of machined surface of parts.
Bliznets M. М. †, Boiko A. A., Sudnik L. V., Drobyshevskaya N. E., Mel'nichenko I. M., Avdeev D. M.
The study of structure and mechanical properties of new ceramic bundle for diamond grinding wheel. pp. 24--27
Summary: The structure of ceramic binders was studied by method of scanning microscopy based on a structural glass waste, metaphosphate (mixture 1) and structural glass waste, labrodorit and chamotte (mixture 2). It was found that while shaping a ceramic binder N1 crystal phases, mullite and a-corundum are formed. Additional portions of labrodorit and chamotte to a ceramic binder N2 leads to creating mullite and a- corundum of anorite phase. Physical and mechanical properties of diamond grinding materials have been studied.
MATERIALS
Fedorov V. D., Polosmak N. D.
Relaxation transitions and quantum states of molecular strecture of thermoplastic polyurethane based on oligoether. pp. 28--30
Summary: Mechanical properties of thermoplastic polyurethane (TPU) Vitur T 0433-85 have been studied by the method of torsion oscillations. It is shown that hybridization is observed in the states of polyurethane both flexible and rigid blocks. Hybridization condition is determined by equality of quantum energy ensured by the magnitude of torsion barriers per unit length of molar mass within quantum periodicity of the blocks. Low-temperature transition T1 is g-transition of the rigid block and b- transition of the flexible one. Transition T2 is simultaneously b- transition of the rigid block and glass transition of the flexible one, while Т3 transition is glass transition of the rigid and liquid-liquid 3 transition of the flexible block.
Bogdanovich P. N., Kuzmenkova E. I., Baidak A. A.
The wear-resistant coatings based on mixture of epoxy compounds. pp. 31--34
Summary: The influence of the low- and high-molecular components ratio, mineral and organic dispersion fillers on the physical-mechanical and triboengineering characteristics of compositions have been investigated. It is shown that both the linear wear rate and coefficient of friction reach minimum when the polymer filler forming the films with low shear strength and low cohesive energy is used.
Kravehenko V. I., Struk V. A., Kostyukovich G. A., Oskirko I. N.
Composite materials for antifriction coat for splines of torque tube drives. pp. 35--39
Summary: The thickness of an antifriction coating on the basis of thermoplastic connecting for spline couplings in gimble drives was estimated. The methods of polyamide modification have been proposed permitting lo improve triboengineering and adhesive performances of the coating. The new types of phosphatic coatings with increased operational life have been designed.
Karpovich O. A., Markov A. V., Stavrov V. P.
Consolidation of reinforced thermoplastic strands. pp. 40--44
Summary: The models of comelting and compacting the glass reinforced thermoplastic srtands have been investigated. The influence of strands vicsosity and dependence of the porosity on the process parameters using modificed Ohnesorge number were established.
Poklonski N. A., Gorbachuk N .I.
Conductivity of nonhomogeneous percolation cluster in polymer composite. pp. 45--48
Summary: AC conductivity of composites of high density polyethylene and carbon black Chezcarb EC-A was examined at the room temperature. Due to presence of dielectric layers of conducting carbon clusters the 'unsharp' jumps of conductivity and capacity were observed. Conductivity of polyethylene matrix layers in nonhomogeneous percolation cluster was found to increase with increase of mass concentration of carbon black in the composite.
Plyushchik O. A., Aniskevich A. N.
Water sorption and swelling of polyester resin. pp. 49--53
Summary: Sorption, desorption of atmospheric moisture and water by polyester resin at different temperatures, and kinetics of swelling of the material at different conditions have been investigated. Specimens were moistened in atmosphere with relative humidity 77. 98% and in water at temperatures 8, 20 and 45 °C. Sorption kinetics was described by the Fick's law. Mass changes of the specimens moistened in water were caused by three thermally activated processes: 1) diffusional sorption, 2) additional sorption necessary for hydrolysis, and 3) leaching of low molecular weight component. The basic mechanism of water sorption at temperatures 8 and 20 °C was the reversible Fickian diffusion. Mass changes at temperature 45 °C wais caused by all the three processes, that resulted in unlimited specimens mass growth, despite significant leaching of low molecular weight components. Different kinetics of swelling showed the distinction in mechanisms of water sorption.
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. 54--57
Summary: The abrasive diamond-containing composites based on a modified phenol-formaldehyde resin have been developed. When grinding the T15K6 hard alloy they allow 15--32% decrease in specific diamond consumption as compared to grinding using a conventional nonmodified composite. The effect of the modifying agents content on technological characteristics of the new materials has been studied.
Burya A. I., Kholodilov O. V., Arlamova N. Т., Sytnik S. V.
Investigation of phenilon and carbon plastics on its based thermal destruction. pp. 58--61
Summary: The process of thermal decomposition of aromatic polyamide phenilon C-2 and carbon plastics on its base has been investigated. The influence of modified carbon fibres on carbon plastics thermoresistance is shown. The capability of application of integral mathematical models of different mechanisms of heterogeneous reactions for determination of kinetic parameters and thermolysis' mechanism of researched materials have been considered.
Yegorov L. I., Morozova G. E., Shut V. N., Kashevich I. F., Maltsev N. G., Lyakhov S. V.
Many-functional elements for protection of electronic techniques from overvoltage and conductive noises. pp. 62--66
Summary: The results of experimental research of the dopes' influence onto the electrical-physical characteristics of varistor materials have been presented. The methods of obtaining the multi-functional protection elements, which are the varistor-capacitor monoblocks, were considered. It was shown that the developed elements were the effective protection means of the automobile electronic circuits against electrical noises.
Ivaschenko S. A., Frolov I. S., Mrochek G. A.
Research of magnetic properties of steel details. pp. 67--69
Summary: Magnetic characteristics of steels were chosen as a subject of the research. The factors that determine magnetic characteristics of steels were set. It was revealed that austenic steel 12X18H10T has the best non-magnetic characteristics. Methods of strengthening, which would secure operating qualities of austenic chromium-nickel steel and preserve its non-magnetic characteristics have been suggested.
TECHNOLOGIES
Shapovalov V. M., Pleskachevsky Yu. M, Tartakowsky Z.
Recycling of polymer materials (a review). pp. 70--76
Summary: The review cites methods used in recycling polymer wastes (plastics, composites, industrial rubber, etc) and general perspective tendencies observed in this field for the new millennium. Processing of polymer wastes is considered to be an actual problem all around the world, so its solution is strongly essential for the industry. Of a prior importance here is the development and adoption of complex recycling programs of polymer wastes able to prolong life of polymers, return valuable materials into economy making provision for safeness and environmental protection.
Dubinskii N. A., Svirsky D. N.
Application of the galvanoplastic in compact system of plastic articles small series production. pp. 77--80
Summary: A powder galvanoplastic mould production method in compact manufacturing system is described. The mathematical model of strength of galvanoplastic coatings with solid particles inclusions is found.
Vereschagin M. N., Stasenko D. L.
Peculiarities of disintegration of a spray of a melt by a gas stream with complecated motion. pp. 81--85
Summary: The results of the research of obtaining metal powders from alloy on the basis of Fe--C--B--Si-system at dispersion of the melt spray by gas flow having a complex rotational-translational-vibratory motion are presented. The shape of obtained items has been analyzed. It is shown that power of the gas flow renders the greatest influence on the sizes of received items. The process of dispersion of a melt spray by gas flow was theoretically analyzed.
TOOLS, INSTRUMENTS AND TEST METHODS
Kane M. M„ Ivanov B. V., Feldshtein E. E.
The investigation of different factors influence on serviceability of assembly hob cutters during cylindrical gear cutting. pp. 86--89
Summary: Results of comparative researches of assembly hobbing cutters with backing off and cylindrical teeth are described. Cutters with cylindrical teeth have provided promotion of account life 1.3--2.2 times; decrease of teeth relative wear 1.5--1.9 times; promotion of tool life between sharpening about 4.5 times; number of sharpening about 2.2 times in comparison to standard hobbing cutters. Total resistance of cutlers with cylindrical teeth accounting their bigger length and lower wear rate is higher 8--9 times
Burskii V. A.
Schemes of machining and fixing tooling for turning of non-rigid stretched parts. pp. 90--98
Summary: The review and analysis of the publications relating to the development of new methods of machining of non-rigid parts - body of rotation - on turning machines have been made, as well as the review of the corresponding accessories for their implementation.
Goldade V. A., Kravtsov A. G., Gorokhovatsky Yu. A., Temnov D. E., Kuvshinova O. V., Zotov S. V.
Investigation of the electret state of polyethylene fibers using by thermoactivation spectroscopy methods. pp. 99--102
Summary: The electret state of polyethylene fibers has been investigated by thermoactivation methods. It is shown that the charge state of these materials is determined by existing of several types of polarization. In the TSC spectra of the charged material were identified new peaks for some structural elements of non-polar polyethylene, which could be responsible for the electret effect. A possibility of exact determination of the activation energy and frequency factor of relaxation was demonstrated at combining the TSC and TSRP methods. The conclusion is made that the various thermoactivation methods can successfully be used in experimental practice as complementary.
Melnikova E. P.
The usage of metallurgy wastes on production of abrasive instrument for the vibration hone. pp. 103--105
Summary: The results of researches of effectiveness of abrasive instrument application on the basis of metallurgical production wastes in comparison with the samples used in industry are presented. The use of blast production slag's for manufacture of abrasive granules does not worsen the technological characteristics and reduces the instrument production price.
Yurkowska B., Koval V. N., Yurkowski B., Pesetskii S. S.
Investigation of compounds based on natural and epoxidized natural rubbers by method relaxation spectroscopy. pp. 106--110.
Summary: Rubber compounds based on natural rubber and its blends with epoxidized natural rubber were tested and examined using the relaxation spectrometry technique (the inverse torsion pendulum testing machine, frequency 1 Hz). It was shown that the method allows obtaining information on important parameters of the vulcanization without pressure, such as induction period of the net formation, overvulcanization, temperature coefficient of vulcanization. It was established that vulcanized rubber with net-like structure forming at the early stages of the main vulcanization period has maximum mechanical losses.
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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
