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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Structural Mechanics of Engineering Constructions and Buildings</journal-id><journal-title-group><journal-title xml:lang="en">Structural Mechanics of Engineering Constructions and Buildings</journal-title><trans-title-group xml:lang="ru"><trans-title>Строительная механика инженерных конструкций и сооружений</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1815-5235</issn><issn publication-format="electronic">2587-8700</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">38256</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2024-20-1-27-39</article-id><article-id pub-id-type="edn">XNRJTY</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Theory of plasticity</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Теория пластичности</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Mixed FEM for Shells of Revolution Based on Flow Theory and its Modifications</article-title><trans-title-group xml:lang="ru"><trans-title>Смешанная формулировка МКЭ в расчете оболочек вращения на основе теории течения и ее модификаций</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3047-5256</contrib-id><name-alternatives><name xml:lang="en"><surname>Kiseleva</surname><given-names>Rumia Z.</given-names></name><name xml:lang="ru"><surname>Киселева</surname><given-names>Румия Зайдуллаевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Applied Geodesy, Environmental Management and Water Management</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры прикладной геодезии, природообустройства и водопользования</p></bio><email>rumia1970@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3496-2008</contrib-id><name-alternatives><name xml:lang="en"><surname>Kirsanova</surname><given-names>Natalia A.</given-names></name><name xml:lang="ru"><surname>Кирсанова</surname><given-names>Наталья Анатольевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Physical and Mathematical Sciences, Professor of the Department of Mathematics</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор департамента математики</p></bio><email>nagureeve@fa.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7098-5998</contrib-id><name-alternatives><name xml:lang="en"><surname>Nikolaev</surname><given-names>Anatoliy P.</given-names></name><name xml:lang="ru"><surname>Николаев</surname><given-names>Анатолий Петрович</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor of the Department of Mechanics</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор кафедры механики</p></bio><email>anpetr40@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1027-1811</contrib-id><name-alternatives><name xml:lang="en"><surname>Klochkov</surname><given-names>Yuriy V.</given-names></name><name xml:lang="ru"><surname>Клочков</surname><given-names>Юрий Васильевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor, Head of the Department of Higher Mathematics</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор, заведующий кафедрой высшей математики</p></bio><email>klotchkov@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7394-8885</contrib-id><name-alternatives><name xml:lang="en"><surname>Ryabukha</surname><given-names>Vitaliy V.</given-names></name><name xml:lang="ru"><surname>Рябуха</surname><given-names>Виталий Васильевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Postgraduate student of the Department of Mechanics</p></bio><bio xml:lang="ru"><p>аспирант кафедры механики</p></bio><email>vitalik30090@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Volgоgrad State Agrarian University</institution></aff><aff><institution xml:lang="ru">Волгоградский государственный аграрный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Financial University under the Government of the Russian Federation</institution></aff><aff><institution xml:lang="ru">Финансовый университет при Правительстве Российской Федерации</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2024</year></pub-date><volume>20</volume><issue>1</issue><issue-title xml:lang="en">VOL 20, NO1 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 20, №1 (2024)</issue-title><fpage>27</fpage><lpage>39</lpage><history><date date-type="received" iso-8601-date="2024-03-15"><day>15</day><month>03</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Kiseleva R.Z., Kirsanova N.A., Nikolaev A.P., Klochkov Y.V., Ryabukha V.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Киселева Р.З., Кирсанова Н.А., Николаев А.П., Клочков Ю.В., Рябуха В.В.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Kiseleva R.Z., Kirsanova N.A., Nikolaev A.P., Klochkov Y.V., Ryabukha V.V.</copyright-holder><copyright-holder xml:lang="ru">Киселева Р.З., Кирсанова Н.А., Николаев А.П., Клочков Ю.В., Рябуха В.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/38256">https://journals.rudn.ru/structural-mechanics/article/view/38256</self-uri><abstract xml:lang="en"><p style="text-align: justify;">For describing elastoplastic deformation, three versions of constitutive equations are used. The first version employs the governing equations of the flow theory. In the second version, elastic strain increments are defined the same way as in the flow theory, and the plastic strain increments are expressed in terms of stress increments using the condition of their proportionality to the components of the incremental stress deviator tensor. In the third version, the constitutive equations for a load step were obtained without using the hypothesis of separating strains into the elastic and plastic parts. To obtain them, the condition of proportionality of the components of the incremental strain deviator tensor to the components of the incremental stress deviator tensor was applied. The equations are implemented using a hybrid prismatic finite element with a triangular base. A sample calculation shows the advantage of the third version of the constitutive equations.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Для учета упругопластического деформирования используются физические уравнения в трех вариантах. В первом варианте применяются определяющие уравнения теории течения, во втором варианте физических уравнений приращения упругих деформаций определяются, как и в теории течения, а приращения пластических деформаций выражаются через приращения напряжений с использованием условия их пропорциональности компонентам девиатора приращений напряжений, в третьем варианте физические уравнения на шаге нагружения получены без гипотезы о разделении деформаций на упругие и пластические части. Для их получения использовано условие пропорциональности компонент девиаторов приращений деформаций компонентам девиаторов приращений напряжений. Реализация уравнений выполнена с использованием гибридного призматического конечного элемента с треугольным основанием, на конкретном примере показано преимущество третьего варианта физических уравнений.</p></trans-abstract><kwd-group xml:lang="en"><kwd>shell of revolution</kwd><kwd>physical nonlinearity</kwd><kwd>prismatic finite element</kwd><kwd>mixed functional</kwd><kwd>implementation of mixed FEM</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>оболочка вращения</kwd><kwd>физическая нелинейность</kwd><kwd>призматический конечный элемент</kwd><kwd>смешанный функционал</kwd><kwd>реализация смешанного МКЭ</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Golovanov A.I., Sultanov L.U. Mathematical Models of Computational Nonlinear Mechanics of Deformable Media. Kazan: Kazan State un-t; 2009. (In Russ.) 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