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Vibrations in engineering and technology

space SCIENTIFIC JOURNALS OF VINNITSA NATIONAL AGRARIAN UNIVERSITY

Issue №: 1(104)

Published: 2022.04.29
DOI: 10.37128/2306-8744-2022-1


Description:
The journal deals with the problems of vibration technologies and machines, mathematical methods of vibration process studies, information on design and technological development, presents teaching and methodological aspects of teaching in the Higher School of Applied Sciences, where vibration machines and technologies are studied.

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DETERMINATION OF KINEMATIC CHARACTERISTICS OF METAL PLASTIC FLOW UNDER CONDITIONS OF AXIAL SYMMETRY OF THE DEFORMATION PROCESS

DOI: 10.37128/2306-8744-2022-1-11
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Sivak Roman – Doctor of Technical Sciences, Associate Professor of the Department of General Technical Disciplines of Vinnytsia national agrarian university (st. Soniachna, 3, Vinnytsia, Ukraine, 21008, e-mail: sivak_r_i@ukr.net)

Ostrovsky Anatoliy – assistant of the department machinery and equipment for agricultural production of the Vinnytsia National Agrarian University (3, Solnechnaya St., Vinnitsa, 21008, Ukraine, email: anatol.u.ostrowski@gmail.com).

Zalizniak Roman – graduate student (st. Soniachna, 3, Vinnytsia, Ukraine, 21008, e-mail: pacifistroma@gmail.com) 

 

Annotation

With axisymmetric deformation, the deformable body and the load have a common axis of symmetry. Such deformation occurs in numerous technological operations. About 70% of parts obtained by cold extrusion are deformed under conditions of axial symmetry.

The plane problem of the theory of plasticity is reduced to a solution in the framework of a two-dimensional statement, when the motion of points in the section of a workpiece is analyzed. Each point can move only in the section plane, and its velocity can be decomposed into two mutually perpendicular directions along the coordinate axes. For plane deformation, it is assumed that the velocity in the direction of the third coordinate axis is equal to zero.

The presence of axial symmetry allows us to confine ourselves to studying the behavior of points located on the plane of the meridional section of the workpiece. In this case, each point can move only in the section plane and its velocity can be decomposed into two orthogonal directions: along the axis and along the radius. The component of the velocity vector in the circumferential direction is equal to zero, so only four of the six independent components of the strain rate tensor remain. In this regard, axisymmetric problems of the theory of plasticity are of considerable interest from the point of view of solving applied problems.

The article discusses the possibility of using mixed Euler and Lagrange coordinates to determine the components of the strain rate tensor in plastic deformation processes characterized by the axisymmetric nature of metal plastic flow. The vector field of displacements at each point in space reflects the transformation of the initial (non-deformed) configuration into the current one, and therefore determines the configuration of the deformed body in space in a certain frame of reference. The deformation process is first considered in a single Cartesian coordinate system, and then in a cylindrical coordinate system, the use of which is more appropriate for axisymmetric deformation. It is assumed that the functions of the Euler coordinates from the Lagrange coordinates are obtained by approximating the experimental data.

 

Keywords: Lagrange and Euler variables, strain tensor components, strain rate tensor components, plastic flow, deformed state, Cartesian coordinate system, cylindrical coordinate system, axisymmetric deformation.

List of references

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2. Маtvіychuk V. А., Bubnоvskа І. А. Оtsіnkа dеfоrmоvаnоstі mаtеrіаlu kryvоlіnіynyh zаgоtоvоk pry hоlоdnоmu vаltsuvаnnі. Теhnіkа, еnеrgеtykа, trаnspоrt АPК. Vіnnytsia. 2017. Vypusk 4. S. 92-97.

3. Мyhаlеvych V. М., Dоbrаniuk Iu. V., Кrаevskyi V. О. Pоrіvnialnе dоslіdzhеnnia mоdеlеy grаnychnyh plаstychnyh dеfоrmаtsіy. Vіsnyk mаshynоbuduvаnnia tа trаnspоrtu. Vіnnytsia. 2018. № 2. S. 56-64.

4. Grushkо О. V., Оgоrоdnіkоv V. А., Slоbоdianiuk Iu. О. Dеfоrmоvnіst malоvuglеtsеvоgо drоtu v prоtsеsі yоgо bаgаtоstupіnchаstоgо hоlоdnоgо vоlоchіnnia. Vіsnyk Vіnnytskоgо pоlіtеhnіchnоgо іnstytutu. Vіnnytsia. 2019. №3. S. 103-110.

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6. Rekechynskyi V. І. Zastosuvannia metody funktsiy toku v statsionarnyh protsessah plastychnogo deformuvannia. Vibratsii v tehnitsi і tehnologiah. Vinnytsia. 2020. №2 (97). S. 157-163.

7. Syvаk R. І., Gunkо І. V., Zаlіzniak R. О. Zаstоsuvаnnia lіnіy tоku pry vyznаchеnnі kіnеmаtychnyh hаrаktеrystyk v stаtsіоnаrnyh prоtsеsаh plаstychnоy tеchiy mеtаlu. Vibratsii v tehnitsi і tehnologiah. Vinnytsia. 2021. №2 (97). S. 157-163.

8. Syvаk R. І., Zаlіzniak R. О. Doslidzhennia kinematyky plastychnoi techii metalu za dopomogoiu zminnyh Eilera i Lagranzha. Vibratsii v tehnitsi і tehnologiah. Vinnytsia. 2021. №4 (103). S. 68-76.

 

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About journal

Topics of the journal:

The journal "Vibrations   in engineering  and technology" presents materials on the following issues

• Theory of processes and machines
• Mechanical Engineering and materialprocessing
• Processing and food production

Key information:
ISSN (print): 2306-8744
DOI: 10.37128/2306-8744

The certificateof massmediaState registration:kv no 16643-5115 from 30.04.2010 .
Founder of the journal: Vinnytsia National Agrarian University

Kind of publication: journal
Type of publication : Scientific
Publication status: Domestic
Year of founding:
Periodicity: 4 times a year
Extent: 18.75 nominal printed pages
ISSN: 2306-8744 (printed version), (online)
Language of edition  : (mixed languages) Ukrainian, English
The scope of the distribution and the category of readers: national, foreign, teaching staff, scientists, businessmen.
Periodical is included in the list of scientific professional editions of Ukraine approved by the Order of Ministry of Education and Sciences of Ukraine from 21.12.2015 No. 1328.
The journal "Vibrations in engineering and technology" is included in the "Catalogue of periodicals of Ukraine".
Journal subscription can be executed in each post office department.
 Subscription Index is  99720.

 

Old version of site: http://vibrojournal.vsau.edu.ua/

History of journal:

In June 1994 the 2nd International Scientific and Technical Conference "Application of vibrations for technological purposes" was organized on the basis of Vinnytsia State Agricultural Institute. Leading experts in this field, noting the significant contribution to the school of Vibration Engineering under the leadership of P. S. Bernyk, proposed to create a professional all-Ukrainian scientific and technical journal "Vibration in engineering and technology..The journal was foundedat Vinnytsia State Agricultural Institute and P.S. Bernyk was elected to be the chief editor .
For all these years (since 1994) theJournal "vibration in engineering and technology" published  94 issues wherestudy of vibration effects, the creation of progressive energy saving technologies and equipment for their implementation were highlighted.
Currently Kaletnik H.M  PhD , professor, academician NAAS is the chief editor of the "Vibrations in engineering  and Technology"
The journal "Vibration in Engineering and technology", which has no analogues on the territory of Ukraine, is well known abroad.