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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">blackmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Черная Металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-0797</issn><issn pub-type="epub">2410-2091</issn><publisher><publisher-name>National University of Science and Technology "MISIS"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">blackmet-850</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕРИАЛОВЕДЕНИЕ И НАНОТЕХНОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATERIAL SCIENCE AND NANOTECHNOLOGIES</subject></subj-group></article-categories><title-group><article-title>Влияние зон с переменными силами трения на усилие осадки прямоугольной полосы</article-title><trans-title-group xml:lang="en"><trans-title>Influance zones with variable frictional forces on the  effort of the upsetting of rectangular strip</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баранов</surname><given-names>Георгий Леонидович</given-names></name><name name-style="western" xml:lang="en"><surname>Baranov</surname><given-names>George</given-names></name></name-alternatives><bio xml:lang="ru"><p>Профессор кафедры Детали машин</p></bio><email xlink:type="simple">bargeleo@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Уральский федеральный университет имени первого Президента России Б.Н.Ельцина</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ural Federal University named after the first President of Russia B.N.Yeltsin</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>09</day><month>09</month><year>2017</year></pub-date><volume>60</volume><issue>9</issue><elocation-id>850</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Баранов Г.Л., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Баранов Г.Л.</copyright-holder><copyright-holder xml:lang="en">Baranov G.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://fermet.misis.ru/jour/article/view/850">https://fermet.misis.ru/jour/article/view/850</self-uri><abstract><p>Проведен анализ новых решений для определения контактных напряжений в зонах очага деформации с переменными силами трения при осадке прямоугольной полосы. Показано, что использование точного условия пластичности вместо приближенного, записанного в главных напряжениях, меняет характер эпюр контактных напряжений в зонах скольжения и застоя, а также существенно влияет на размеры этих зон. Определены условия существования зон торможения и скольжения в зависимости от коэффициента трения и относительной ширины полосы. Разработана методика определения усилия осадки для двухзонных и трехзонных эпюр контактных напряжений. Выполнено сопоставление полученных результатов с известными экспериментальными и теоретическими данными. Дана оценка погрешности расчета усилия осадки инженерным методом.</p></abstract><trans-abstract xml:lang="en"><p>The analyses of new solutions to determine of the contact stress in zones with variable frictional forces for upsetting the rectangular strip are executed. It is shown that replacement of the Mises precise plasticity condition by an approximate condition in terms of primary stress, changes the character of curves contact stresses in the slip and dead zones, and significantly influences on the dimensions of these zones. Conditions of existence of the slip and retardation zones on the contact surface of the deformation region in depending on the friction coefficient and the relative width of the strip are installed. A method for determining efforts of the upsetting for bizonal and three-zone curves of contact stresses is developed. Comparison of the results with known experimental and theoretical data has done. The estimation of error calculation effort of upsetting by the engineering method is obtained.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>осадка</kwd><kwd>условия трения</kwd><kwd>контактные напряжения</kwd><kwd>условия существования зон скольжения и торможения</kwd><kwd>усилие осадки</kwd></kwd-group><kwd-group xml:lang="en"><kwd>upsetting process</kwd><kwd>friction conditions</kwd><kwd>contact stresses</kwd><kwd>conditions of existence of the slip and retardation zones</kwd><kwd>upsetting force</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">УрФУ</funding-statement><funding-statement xml:lang="en">UrFU</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Kontaktnoe trenie v protsessah obrabotki metallov davleniem / A. N. Levanov, V. L. Kolmogorov, S. P. Burkin i dr. 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