4_2011_sen_12

Title of the article

COMPUTATIONAL INVESTIGATION OF KINEMATICS OF THE EQUAL CHANNEL ANGULAR PRESSING PROCESS IN TWO-DIMENSIONAL AND THREE-DIMENSIONAL STATEMENTS OF THE PROBLEM
Authors

Pershin D.S., Student, Moscow State University n.a. M.V. Lomonosov, Moscow, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ovchinnikova N.V., Candidate of Physical and Mathematical Sciences, Researcher at the Laboratory of the Research Institute of Mechanics, Moscow State University n.a. M.V. Lomonosov, Moscow State University, Moscow, Russia
In the section TECHNOLOGICAL MECHANICS
Year 2011 Issue 4 Pages 66-70
Type of article RAR Index UDK 539.3 Index BBK  
Abstract Numerical simulation of equal channel angular pressing process was done. Two dimensional and threedimensional statements of the problem were considered. Possibility of usage (for analysis of technological process) in some cases 2D statement instead of 3D statement for the purpose of decrease resource complexity of the problem was demonstrated. It was done on basis of comparison calculation`s results for both cases. Principal attention was spared for kinematics of the process.
Keywords

equal channel angular pressing, severe plastic deformation, numerical modeling, reinforcement, ductility
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Bibliography
  • Semiatin S.L., Salem A.A., Saran M.J. Models for Severe Plastic Deformation by Equal-Channel Angular Extrusion. JOM, 2004, vol. 56, issue 10, pp. 58-63.
  • Jong-Woo Park, Jin-Yoo Suh. Effect of die shape on the deformation behavior in equal-channel angular pressing. Metallurgical and Materials Transactions A, 2001, vol. 32, issue 12, pp. 3007-3014.
  • Segal V.M. Materials processing by simple shear. A Materials Science and Engineering, 1995, 197, pp. 157-164.
  • N. de Medeiros [et al.]. Computational simulation of an IF-steel deformed by equal channel angular pressing via the finite element method. Mechanics of Solids in Brazil, 2007, pp. 309-320.
  • Kamaletdinov I., Jusupov V., Biba N. Razrabotka i issledovanie matematicheskoj modeli processa ravnokanal'nogo uglovogo pressovanija [Development and research of mathematical model of equal channel angular pressing]. Machines, Technologies, Materials, 2007, no. 2-3, pp. 122-124.
  • Kajbyshev O.A. Sverhplastichnost', izmel'chenie struktury i obrabotka trudnodeformiruemyh splavov [Superplasticity, structure refinement and processing of hard-alloy]. Moscow, Nauka, 2002. 438 p. Chigarev A.V., Kravchuk A.S., Smaljuk A.F. ANSYS dlja inzhenerov [ANSYS for engineers]. Moscow, Mashinostroenie-1, 2004. 512 p.
4_2011_sen_11

Title of the article

THE THEORETICAL AND EXPERIMENTAL STUDIES ON INELASTIC COMPRESSION COMPONENT DETERMINATION FOR T-13 TEXTILE
Authors

Vasilevich Yu.V., Doctor of Physical and Mathematical Sciences, Professor, Head of the Department "Resistance of Materials of Engineering Profile", Belarusian National Technical University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.

Sakhonenko V.M., Candidate of Physical and Mathematical Sciences, Professor, Head of the Department "Applied Mathematics", Moscow State Open University, Moscow, Russia

Sakhonenko S.V., Candidate of Physical and Mathematical Sciences, Acting Associate Professor of the Department "Resistance of Materials Mechanical Engineering Profile", Belarusian National Technical University, Minsk, Republic of Belarus

Gorely K.A., General Director of the JSC "Avangard", Minsk, Republic of Belarus

Malyutin E.V., Chief Designer of the JSC "Avangard", Minsk, Republic of Belarus
In the section MECHANICS OF DEFORMED SOLIDS
Year 2011 Issue 4 Pages 63-65
Type of article RAR Index UDK 539:374.002.62 Index BBK  
Abstract The calculating formulas and practical methods to determine inelastic relative compression of yarn families are established for smooth weaving and biaxial fabrics. The maximum values of the inelastic relative compression for T-13 and BX-470 textiles are determined experimentally.
Keywords

prepreg, fiber, fabric, compression, experimental determination
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Bibliography
  • Libert E.P., Sahonenko V.M. Sposob obrazovanija otverstij v izdelijah iz armirovannyh plastmass [Method for forming holes in products from reinforced plastics]. Patent RB, no. 1431952, 1988.
  • Komkov M.A., Kolganov A.V. Modelirovanie processa formovanija otverstij v izdelijah iz neotverzhdennogo polimerno-voloknistogo materiala [Simulation of forming process of holes in products from uncured polymer fiber material]. Vestn. mashinostroenija MVGTU im. Baumana [Journal of mechanical engineering of the MVGTU n.a. Bauman], 2004, no. 8, pp. 15-18.
  • Chahg L.-W., Yau S.-S, Chou T.-W. Notched strength of woven fabric composites with molded-in holes. Composites, 1987, no. 18(3), pp. 233-241.
  • Kolganov A.V., Libert E.P., Sahonenko V.M. Ustrojstvo dlja poluchenija otverstij v izdelijah [Device for producing holes in products]. Patent RB, no. 1431945, 1988.
  • Komkov M.A. Opredelenie konstruktivnyh i tehnologicheskih parametrov namotki kompozitnyh ballonov torovoj formy [Determination of structural and technological parameters of winding composite cylinders of torus shape]. Moscow, Izd-vo MGTU im. N.Je.Baumana, 2000. 24 p.
  • Vasilevich Ju.V., Sahonenko V.M., Sahonenko S.V. Deformacionnye harakteristiki tekstil'nogo karkasa preprega [Deformative characteristics of prepreg textile material]. Mehanika mashin, mehanizmov i materialov [Mechanics of machines, mechanisms and materials], 2008, no. 3(4), pp. 67-70.
4_2011_sen_9

Title of the article

DYNAMIC OF FALLING FLEXIBLE TREE STEM
Authors

Borisevich S.A., Assistant of the Department "Theoretical Mechanics" Belarusian State Technological University, Minsk, Republic of Belarus

Kamlyuk A.N., Candidate of Physical and Mathematical Sciences, Associate Professor, Deputy Head of Command and Engineering Institute of Ministry of Emergency Situations of the Republic of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section DYNAMICS DURABILITY OF VEHICLES AND STRUCTURES
Year 2011 Issue 4 Pages 54-58
Type of article RAR Index UDK 531.132.1 Index BBK  
Abstract A rod-chain model was used to study the dynamics of a tree stem. A numerical method is developed for simulating the mechanical behavior of a flexible tree stem. The motion of the flexible tree stem is determined under the resistance forces exerting on the tree crown. Flexible tree stem interaction with an elastic foundation and a forest machine is investigated as well. The numerical model is applied for calculating the impulse of force on the elastic foundation and the forest machine.
Keywords

numerical model of a tree, fall dynamics, distortion, forest machine, flexibility of a trunk, elastic foundation
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Bibliography
  • Borisevich S. A., Nemcov V.B. Razrabotka mnogostupenchatoj modeli gibkogo stvola dereva [Development of multi-model flexible trunk]. Tr. BGTU. Ser. VI Fiz.-mat. nauki i inform. [Proc. of the BSTU. Series VI phys. and math. Science and information], 2004, no. XII, pp. 47-49.
  • Borisevich S.A. Konechno-raznostnaja shema dlja issledovanija padenija stvola dereva [Finite-difference scheme for study of a tree trunk fall]. Tr. BGTU. Ser. II, Lesnaja i derevoobrab. prom-st' [Proc. BSRU. Series II, Forestry and woodworking industry], 2008, no. XVI, pp. 104-107.
  • Gang W., Yu W., Zhou Ch. Optimization of the rod chain model to simulate the motions of a long flexible fiber in simple shear flows. European Journal of Mechanics B, 2006, vol. 25, no. 3, pp. 337-347.
  • Denis Dzh., Shnabel' R. Chislennye metody bezuslovnoj optimizacii i reshenija nelinejnyh uravnenij [Numerical methods for unconstrained optimization and solving nonlinear equations]. Moscow, Mir, 1988. 440 p.
  • Allen M.P., Tildesley D.J. Computer Simulation of Liquids. Oxford, Clarendon press, 1999. 385 p.
  • Korotaev L.V. Parametry derev'ev i hlystov kak obektov lesozagotovitel'nogo proizvodstva [Parameters of trees and tree as objects of timber production]. L., ALTI, 1982. 80 p.
  • Cherkasov I.I. Mehanicheskie svojstva gruntov v dorozhnom stroitel'stve [Mechanical properties of soil in road construction]. Moscow, Transport, 1976. 247 p.
4_2011_sen_10

Title of the article

FRACTURE OF A PERFORATED STRINGER PLATE
Authors

Mir-Salim-Zade M.V., Candidate of Physical and Mathematical Sciences, Senior Researcher at the Department of "Theory of Creeping", Institute of Mathematics and Mechanics of the NAS of Azerbaijan, Baku, Azerbaijan
In the section MECHANICS OF DEFORMED SOLIDS
Year 2011 Issue 4 Pages 59-62
Type of article RAR Index UDK 539.375 Index BBK  
Abstract An isotropic medium containing a system of foreign transverse rectilinear inclusions is considered. Such a medium can be interpreted as an infinite plate, reinforced with a regular system of stringers, whose cross sections are very narrow rectangles. Medium is weakened by a periodic system of rectilinear cracks emanating from the contours of the holes. The action of the stringers is replaced by unknown concentrated forces at the points of their connection with the medium. The boundary-value problem on the equilibrium of the periodic system of cracks is reduced to a singular integral equation, from the solution of which the stress intensity factors are found. The condition of limiting equilibrium of cracks is formulated based on the criterion of brittle fracture.
Keywords

reinforced perforated plate, stringers, periodic system of cracks, stress intensity factors
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Bibliography
  • Mushelishvili N.I. Nekotorye osnovnye zadachi matematicheskoj teorii uprugosti [Some basic problems of mathematical theory of elasticity]. Moscow, Nauka, 1966. 707 p.
  • Panasjuk V.V., Savruk M.P., Dacyshin A.P. Raspredelenie naprjazhenij okolo treshhin v plastinah i obolochkah [Stress distribution near cracks in plates and shells]. Kiev, Nauk. dumka, 1976. 443 p.
  • Mirsalimov V.M. Neodnomernye uprugoplasticheskie zadachi [Multidimensional elastic-plastic problems]. Moscow, Nauka, 1987. 256 p.
4_2011_sen_8

Title of the article

CALCULATION OF DYNAMIC CHARACTERISTICS OF SPINDLE UNIT AND MULTI-CRITERIA SELESTION OF THEIR MOST RATIONAL PARAMETERS
Authors

Basinyuk V.L., Doctor of Technical Sciences, Associate Professor, Director of the STC "Technology of Mechanical Engineering and Technological Equipment" , Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kuleshova A.V., Junior Researcher of the Laboratory of Drive Systems and Technological Equipment, STC "Technology of Mechanical Engineering and Technological Equipment", Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus
In the section DYNAMICS DURABILITY OF VEHICLES AND STRUCTURES
Year 2011 Issue 4 Pages 49-53
Type of article RAR Index UDK 621.924.5 Index BBK  
Abstract The paper presents the methodical approach to the calculation of dynamic characteristics of spindle unit and multicriteria selection of their most rational parameters. On the example of spindle unit with belt drive of spindle unit with belt drive of the circular grinding machines was held the choice of parameters, using as the criteria values of natural frequencies and mode shape of spindle. Parameters boundary of spindle unit, meeting the requirements of its dynamic qualities throughout the operating frequency range were determined.
Keywords

dynamical characteristics, spindle assemblies, vibration level, friction bearings, cylindrical grinding machine
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Bibliography
  • Push A.V. Shpindel'nye uzly. Kachestvo i nadezhnost' [Spindle units. Quality and reliability]. Moscow, Mashinostroenie, 1992. 288 p.
  • Dimentberg F.M. Izgibnye kolebanija vrashhajushhihsja valov [Bending oscillations of rotating shafts]. Moscow, AN SSSR, 1959. 247 p.
  • Kelzon A.S., Cimanskih Ju.P., Jakovlev V.I. Dinamika rotorov v uprugih oporah [Dynamics of rotors in elastic supports]. Moscow, Nauka, 1982. 280 p.
  • Homjakov V.S., Kochinev N.A., Sabirov F.S. Modelirovanie i raschet dinamicheskih harakteristik shpindel'nyh uzlov [Simulation and calculation of dynamic characteristics of spindles]. Vestn. UGATU [News of the UGATU], 2007, no. 2(31), pp. 69-75.
  • Maslov G.S. Raschet kolebanij valov [Calculation of shaft vibrations]. Moscow, Mashinostroenie, 1980. 151 p.
  • Ivovich V.A. Perehodnye matricy v dinamike uprugih sistem [Transition matrix in dynamics of elastic systems]. Moscow, Mashinostroenie, 1969. 184 p.
  • Makeev V.P., Grinenko N.I., Pavljuk Ju.S. Statisticheskie zadachi dinamiki uprugih konstrukcij [Statistical problems of dynamics of elastic structures]. Moscow, Nauka, 1984. 232 p.
  • Sobol M.I., Statnikov R.B. Vybor optimal'nyh parametrov so mnogimi kriterijami [Selection of optimal parameters of many criteria]. Moscow, Nauka, 1981. 107 p.

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