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Machines Technologies Materials International virtual journal for science, technics and innovations for the industry MACHINES TECHNOLOGIES MATERIALS SSN 1313-0226 I / 2014 10 Issue VIII YEAR Published by Scientific technical Union of Mechanical Engineering MACHINES, TECHNOLOGIES, MATERIALS INTERNATIONAL VIRTUAL JOURNAL PUBLISHER SCIENTIFIC TECHNICAL UNION OF MECHANICAL ENGINEERING 108, Rakovski Str., 1000 Sofia, Bulgaria tel. (+359 2) 987 72 90, tel./fax (+359 2) 986 22 40, [email protected], www.mech-ing.com/journal ISSN 1313-0226 YEAR VIII ISSUE 10 / 2014 EDITORIAL BOARD Editor-in-chief: Prof. Dr. Mitko Mihovski – Chairman of the Scientific Council of the STUnion of Mechanical Engineering AKADEMIC CONCEPTIONAL BOARD EDITORIAL COUNCIL Acad. Vassil Sgurev Prof. D.Sc. Georgi Popov Acad Yachko Ivanov Prof. D.Sc. Alexander Skordev Acad Vladimir Klyuev Prof. D.Sc. Nikola Rashkov Acad. Rivner Ganiev Prof. D.Sc. Dimitar Stavrev Corr. mem. Georgi Mladenov Prof. D.Sc. Hristo Shehtov Corr. mem. Dimitar Buchkov Prof. Dr. Todor Neshkov Corr. mem. Stefan Hristov Prof. Dr. Dimitar Damianov Corr. mem. Venelin Jivkov Prof. Dr. Kiril Arnaudov Corr. mem. Anatoliy Kostin Prof. Dr. Snejana Grozdanova Corr. mem. Edward Gorkunov Prof. Dr. Vassil Georgiev Assoc. Prof. Lilo Kunchev EDITORIAL BOARD – EXPERTS AND REVIEWERS FROM BULGARIA FOREIGN MEMBERS Prof. D.Sc. Nyagol Manolov PD. D. PE Assoc. Prof D.Midaloponlas Prof. D.Sc. Vitan Galabov Prof. Dr. Athanasios Mihaildis Prof. D.Sc. Emil Momchilov Prof. Amos Notea Prof. D.Sc. Emil Marinov Prof. Dr. Eng. Airon Kubo Prof. D.Sc. Dimitar Katzov Prof. Dr. Eng Georg Dobre Prof. D.Sc. Stavri Stavrev Prof. Dr. Dimitrov Dimitar Prof. D.Sc. Georgi Raychevski Prof. Dr. Mohora Cristina Prof. D.Sc. Ivan Yanchev Prof. Dr. Popa Marcel Prof. D.Sc. Marin Stoychev Prof. Dr. Sobczak Jerzy Prof. D.Sc. Roman Zahariev Prof. Dr. Tamosiuniene Rima Prof. D.Sc. Vassil Mihnev Prof. Alexander Dimitrov Prof. D.Sc. Valentin Abadjiev Prof. dr. Marian Tolnay Assoc. Prof. Dimitar Stanchev Prof. dr. Mikolas Hajduk Assoc. Prof. Milcho Angelov Assoc. Prof. Mihail Mihovski Assoc. Prof. Radi Radev The current issue and the first issue of journal and Assoc. Prof. Georgi Todorov the conditions for publication can be find on Assoc. Prof. Simeon Petkov l Assoc. Prof. Petar Dobrev www.mech-ing.com/journa Assoc. Prof. Nikolay Piperov CONTENTS MECHANICAL SCHEMES AND SUSTAINABILITY OF PLASTIC FLOW METAL Sosenushkin E.H., Yanovskaya E.A., Sosenushkin A.E. .............................................................................................................. 3 THE STUDY OF THE PROCESS OF COMPLEX DIFFUSION SATURATION WITH BORON AND VANADIUM ON THE CARBON STEELS Lygdenov B., A. Guriev, A. Sitnikov, Mei Shunqi,Y. Khraraev, V. Butukhanov, B. Tsyretorov ................................................ 7 SIMULTANEOUS THERMAL ANALYSIS INVESTIGATION ON PLASMA-AIDED FLAME RETARDANCY OF WOOD Ivanov I., D. Gospodinova, P. Dineff, L. Veleva (Muleshkova) ................................................................................................... 9 APPLICATION OF NUMERICAL METHODS IN CALCULATION OF ELECTROMAGNETIC FIELDS IN ELECTRICAL MACHINES Sarac V., G.Galvincev ................................................................................................................................................................. 13 DETERMINING THE CATEGORY OF WELDED JOINTS FOR THE NON-REGULATED AREA OF MACHINE BUILDING Zhelev A., T.Osikovski ................................................................................................................................................................ 17 GEOMETRICAL SYNTHESIS OF FINE-MODULE RATCHET TOOTHING Sharkov O. ................................................................................................................................................................................... 20 IMPROVING THE UNIFORMITY OF PROPERTY DISTRIBUTION ALONG THE SURFACE OF FILTER MATERIALS OBTAINED USING POROGENS Ilyushchenko А., R. Kusin, I. Charniak, A. Kusin, D. Zhehzdryn .............................................................................................. 24 DIFFUSION BONDING MACHINERY FOR MANUFACTURING AEROSPACE PARTS Lee Ho-Sung, Yoon, Jong-Hoon, Yoo, Joon-Tae ........................................................................................................................ 28 AN AGENT BASED PROCESS PLANNING SYSTEM FOR PRISMATIC PARTS Andreadis G. ................................................................................................................................................................................ 31 EXPERIMENTAL INVESTIGATION ON THE EFFECT OF COOLING AND LUBRICATION ON SURFACE ROUGHNESS IN HIGH SPEED MILLING Leppert T. ..................................................................................................................................................................................... 35 STRUCTURE AND CHARACTERISTICS COMPLEX DIFFUSION LAYERS AFTER SATURATION BORON AND COPPER ON STEEL Chernega S., I. Poliakov, M. Rrasovsky, K. Grynenko ............................................................................................................... 39 ALUMINIUM BIMETAL STRUCTURE PRODUCTION BY LOST FOAM CASTING WITH LIQUID-LIQUID PROCESS Kisasoz A., K. A. Guler, A. Karaaslan ........................................................................................................................................ 43 FABRICATION OF AL/STEEL COMPOSITES BY VACUUM ASSISTED BLOCK MOULD INVESTMENT CASTING TECHNIQUE Guler K.A. A. Kisasoz, A. Karaaslan .......................................................................................................................................... 47 WOOD SURFACE ENERGY DETERMINED BY SESSILE DROP TECHNIQUE AS QUALITY PARAMETER OF PLASMA-CHEMICAL MODIFYED WOOD SURFACES Ivanov I., D. Gospodinova, P. Dineff, L. Veleva ........................................................................................................................ 50 PLATE HEAT EXCHANGER WITH POROUS STRUCTURE FOR POTENTIAL USE IN ORC SYSTEM Wajs J., D. Mikielewicz, E. Fornalik-Wajs ................................................................................................................................. 54 MECHANICAL SCHEMES AND SUSTAINABILITY OF PLASTIC FLOW METAL Sosenushkin E.H., Yanovskaya E.A., Sosenushkin A.E. Abstract. Results of the theoretical analysis of invariant criteria for evaluating the stress-strain state under specific mechanical schemes stresses and deformations on forming operations and their impact on the sustainable flow of processes of plastic deformation are presented Keywords: stress, deformations, invariants tensors, stresses and deformations deviators, sustainability of plastic flow. 1. Introduction. The shells of various shapes and sizes [1-4] is in high According to the criterion of positivity additional loads, demand due to the development of the energy and chemical plastic flow of an incompressible material is stable until the engineering, aviation and space industry, valve industry and condition [21]: household appliances. Sheet punching processes [5-7] are the dσ ≥ σ d ε . (2) most cost-effective in terms of saving resources and energy. The ρ i i sheet or tube workpieces may be used as starting material, When curve approximation metal hardening power law, we depending on the necessary operations such as folding sheet and obtain the following expression: the extractor operations [10.8], distribution and crimping n σi =A εi , (3) operation [11-14]. Plastic deformation processes are not stationary. Thus, where A = σ()1 + δ - the constant of the metal; b preliminary mathematical [14-16] or computer [17] simulation of applied operations to the assessment of stress-strain state of the n =ln()1 + δ - strain hardening index; δ – a uniform metal workpieces with the purpose of forecasting the elongation of the sample when it is tested in tension. sustainability of plastic flow are very important. This expression can be used to calculate the intensity of of Deformation scheme differ non-monotonic. Under complex deformations accumulated in the process of forming [7, 21]: loading deformation direction changes one or more times to the ε 2 i кр 2 1− α + α contrary, and there are the fractional deformation processes. = , (4) Under the terms of continuous medium mechanics [18] for an n 2 − α incompressible material, the deformation of a material point is σ represented as the trajectory of the radius vector in five- where α = θ - dimensionless parameter of the stress state [7, dimensional space of the independent components tensor of σρ deformation. Therefore, under complex loading the trajectory 21, 22], which is the ratio of the principal stresses. drawn by the end of the radius vector is not smooth with breaks We pay attention to the axial symmetry of deformation, [19] or a smooth but with a curvature. Line length of the loading often encountered in sheet punching forming operations during is a measure of the accumulated deformation at the material plastic deformation of shells, and to coaxial principal axes of point. So there will be the largest value of non-monotonic stress, deformation and deformation rate, and also to the deformation, because length polyline or smooth curve is bigger similarity of O.Mora’s pie charts for stresses and deformations than the length of the radius vector. We concluded, if provided equality indicators of stress and deformation state nonmonotonic deformation is implemented for most points in the body, its shape can be changed
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