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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">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2020-21-3-306-316</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-869</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>История математики и приложений</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Сomputer science</subject></subj-group></article-categories><title-group><article-title>Спектральный элемент Лежандра в задачах локализации пластических деформаций</article-title><trans-title-group xml:lang="en"><trans-title>Legendre spectral element for plastic localization problems at large scale strains</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>Левин</surname><given-names>Владимир Анатольевич</given-names></name><name name-style="western" xml:lang="en"><surname>Levin</surname><given-names>Vladimir Anatolyevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, профессор кафедры вычислительной механики механико-математического факультета</p></bio><bio xml:lang="en"><p>Doctor of physical and mathematical sciences, professor, Professor of the department of computational mechanics of the faculty of mechanics and mathematics</p></bio><email xlink:type="simple">v.a.levin@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зингерман</surname><given-names>Константин Моисеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Zingerman</surname><given-names>Konstasntin Moiseevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, заведующий кафедрой математического моделирования и вычислительной математики</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences, professor, head of chair of mathematical modeling and computational mathematics</p></bio><email xlink:type="simple">zingerman@rambler.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Крапивин</surname><given-names>Кирилл Юрьевич</given-names></name><name name-style="western" xml:lang="en"><surname>Krapivin</surname><given-names>Kirill Yurievich</given-names></name></name-alternatives><email xlink:type="simple">k.krapivin@gmail.com</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Яковлев</surname><given-names>Максим Яковлевич</given-names></name><name name-style="western" xml:lang="en"><surname>Yakovlev</surname><given-names>Maksim Yakovlevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук, доцент кафедры вычислительной математики механико-математического факультета</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences, Associate Professor of the Department of Computational Mathematics of the Faculty of Mechanics and Mathematics</p></bio><email xlink:type="simple">m.ya.yakovlev@yandex.ru</email><xref ref-type="aff" rid="aff-4"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет им. М. В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Тверской государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tver State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ООО «Фидесис»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>CAE Fidesys</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Московский государственный университет имени М. В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>28</day><month>12</month><year>2020</year></pub-date><volume>21</volume><issue>3</issue><fpage>306</fpage><lpage>316</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Левин В.А., Зингерман К.М., Крапивин К.Ю., Яковлев М.Я., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Левин В.А., Зингерман К.М., Крапивин К.Ю., Яковлев М.Я.</copyright-holder><copyright-holder xml:lang="en">Levin V.A., Zingerman K.M., Krapivin K.Y., Yakovlev M.Y.</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://www.chebsbornik.ru/jour/article/view/869">https://www.chebsbornik.ru/jour/article/view/869</self-uri><abstract><p>В статье предложен метод спектральных элементов, построенных на полиноме Лежанд-ра для плоских стационарных задач упруго-пластического течения при больших дефор-мациях. Метод спектральных элементов основывается на вариационном принципе, методеГалеркина. Решение указанных задач обладает феноменом локализации пластических де-формаций в узких областях - линиях скольжения. Исследована возможность примененияспектрального элемента для численного решения указанных задач с разрывными решения-ми. Условие текучести материала - критерий Мизеса. Напряжения интегрируются методомрадиального возврата по неявной обратной схеме Эйлера. Система нелинейных алгебраи-ческих уравнений решается итерационным методом Ньютона. Приведено численное реше-ние примера растяжения полосы, ослабленной вырезами с круговым основанием, в плоскомнапряженном и плоском деформированном состояниях. Получены кинематические поля ипредельная нагрузка. Приведены сравнения численных результатов с аналитическим ре-шением, полученным для несжимаемых сред, построенным методом характеристик.</p></abstract><trans-abstract xml:lang="en"><p>In paper the method of spectral elements based on the Legendre polynomial for timeindependentelastic-plastic plane problems at large strains is proposed. The method of spectralelements is based on the variational principle (Galerkin’s method). The solution of theseproblems has the phenomenon of localization of plastic deformations in narrow areas calledslip-line or shear band. The possibility of using a spectral element for the numerical solution ofthese problems with discontinuous solutions is investigated. The yield condition of the materialis the von Mises criterion. The stresses are integrated by the radial return method by backwardimplicit Euler scheme. The system of nonlinear algebraic equations is solved by the Newton’siterative method. A numerical solution is given of an example of stretching a strip weakened bycuts with a circular base in a plane stress and plane deformed state. Kinematic fields and limitload are obtained. Comparisons of numerical results with the analytical solution obtained forincompressible media constructed by the method of characteristics are presented.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>спектральный элемент</kwd><kwd>феномен локализации</kwd><kwd>пластичность</kwd><kwd>метод характеристик</kwd><kwd>конечные деформации</kwd><kwd>итерационный метод Ньютона</kwd></kwd-group><kwd-group xml:lang="en"><kwd>spectral method</kwd><kwd>localization phenomenon</kwd><kwd>plasticity</kwd><kwd>slip-line</kwd><kwd>finite strains</kwd><kwd>iterative Newton’s method</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Министерства науки и высшего образования Российской федерации в рамках базовой части Государственного задания по научной деятельности (проект № 9.7446.2017/8.9) в части, связанной с математической постановкой задачи, при финансовой поддержке РФФИ и Правительства Москвы в рамках научного проекта № 19-38-70001 в части, связанной с разработкой математического метода и алгорит- ма решения задачи, и за счет гранта Российского научного фонда (проект № 19-71-10008) в части, связанной с разработкой и верификацией программного обеспечения и анализом результатов расчетов.</funding-statement><funding-statement xml:lang="en">This work was supported by the Ministry of Science and Higher Education of the Russian Federation in the framework of the basic part of the Government task for scientific activity (project No. 9.7446.2017 / 8.9) in the part related to the mathematical formulation of the problem, with financial support from the Russian Foundation of Basic Research and the Moscow Government (project No. 19-38-70001) in the part related to the development of the mathematical method and algorithm for problem solving, with financial support from the Russian Science Foundation (project No. 19-71-10008) in the part related to development and verification of software and analysis of calculation results.</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">{it Качанов Л. 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