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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">cvmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Цветная металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Non-Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3438</issn><issn pub-type="epub">2412-8783</issn><publisher><publisher-name>НИТУ "МИСИС"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0021-3438-2017-2-66-75</article-id><article-id custom-type="elpub" pub-id-type="custom">cvmet-477</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>Обработка металлов давлением</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Pressure Treatment of Metals</subject></subj-group></article-categories><title-group><article-title>МЕТОДЫ РАСЧЕТА ПРОДОЛЖИТЕЛЬНОСТИ ПРОЦЕССА СВЕРХПЛАСТИЧЕСКОЙ ФОРМОВКИ КРУГЛОЙ МЕМБРАНЫ</article-title><trans-title-group xml:lang="en"><trans-title>Methods to calculate the time of thin circular membrane superplastic forming</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>Круглов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kruglov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. техн. наук, доцент кафедры вычислительной техники и инженерной кибернетики УГНТУ (450062, Уфа, ул. Космонавтов, 1), ст. науч. сотрудник ИПСМ РАН (450001, Уфа, ул. Ст. Халтурина, 39)</p></bio><bio xml:lang="en"><p>Cand. Sci. (Tech.), Associate professor of the Department of computer engineering and cybernetics, Ufa State Petroleum Technological University (USPTU) (450062, Russia, Ufa, Kosmonavtov, 1); Senior researcher of the Institute for Metals Superplasticity Problems, Russian Academy of Sciences (450001, Russia, Ufa, Khalturina, 39)</p></bio><email xlink:type="simple">alweld@go.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>Ганиева</surname><given-names>В. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Ganieva</surname><given-names>V. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. преподаватель той же кафедры УГНТУ</p></bio><bio xml:lang="en"><p>Senior lecture of the same Department USUOP</p></bio><email xlink:type="simple">venera5577@mail.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>Тулупова</surname><given-names>О. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Tulupova</surname><given-names>O. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. преподаватель той же кафедры УГНТУ</p></bio><bio xml:lang="en"><p>Post-graduate student of the same Department USUOP</p></bio><email xlink:type="simple">box_mail_2011@mail.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>Еникеев</surname><given-names>Ф. У.</given-names></name><name name-style="western" xml:lang="en"><surname>Enikeev</surname><given-names>F. U.</given-names></name></name-alternatives><bio xml:lang="ru"><p>докт. техн. наук, проф., зав. той же кафедрой УГНТУ</p></bio><bio xml:lang="en"><p>Dr. Sci. (Tech.), Prof., Heat of the same Department USUOP</p></bio><email xlink:type="simple">kobros@narod.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт проблем сверхпластичности металлов (ИПСМ) РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ufa State Petroleum Technological University</institution><country>Russian Federation</country></aff></aff-alternatives><aff xml:lang="ru" id="aff-2"><institution>Уфимский государственный нефтяной технический университет (УГНТУ)</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>28</day><month>04</month><year>2017</year></pub-date><volume>0</volume><issue>2</issue><fpage>66</fpage><lpage>75</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Круглов А.А., Ганиева В.Р., Тулупова О.П., Еникеев Ф.У., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Круглов А.А., Ганиева В.Р., Тулупова О.П., Еникеев Ф.У.</copyright-holder><copyright-holder xml:lang="en">Kruglov A.A., Ganieva V.R., Tulupova O.P., Enikeev F.U.</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://cvmet.misis.ru/jour/article/view/477">https://cvmet.misis.ru/jour/article/view/477</self-uri><abstract><p>Исследован режим сверхпластической формовки круглой мембраны при постоянном давлении. Математическая модель технологического процесса построена в рамках основных предположений безмоментной теории оболочек, а также двух известных из литературы упрощенных подходов, основанных на гипотезе о равнотолщинности оболочки по ее профилю и равнорастянутости меридиана, проходящего через полюс купола. Проанализированы методы расчета продолжительности процесса сверхпластической формовки круглой мембраны. Проведено конечно-элементное моделирование рассматриваемого процесса с использованием учебной версии программного комплекса ANSYS 10ED. В данной работе рассмотрены два варианта постановки краевой задачи механики сверхпластичности – теории ползучести и вязкопластичности. Результаты вычислений по аналитическим формулам сопоставлены с решениями краевых задач теории ползучести и вязкопластичности, полученными в среде программного комплекса ANSYS. Значения материальных постоянных были определены по данным одноосных испытаний и тестовых формовок титанового сплава ВТ6 (Ti–6Al–4V). Показано, что в том случае, если для идентификации модели материала используются тестовые формовки, результаты расчетов оказываются намного более корректными, а погрешность оценки снижается с уровня ~20 % (при идентификации модели по результатам стандартных одноосных механических испытаний) до ~3 %.</p></abstract><trans-abstract xml:lang="en"><p>The process of superplastic forming of a circular membrane under constant pressure is analyzed. The analytical process model is built based on principal assumptions of the thin shell theory, and two simplified approaches known from the literature and based on the hypothesis on the uniform thickness of a shell along its profile, and the uniform stretching of a meridian passing the dome apex. The methods of calculating the duration of superplastic forming of a circular membrane are considered. The finite element modeling of the process considered is made using the educational version of ANSYS software. The paper considers two boundary value problems stated in terms of superplasticity mechanics – the theory of creep and the theory of viscoplasticity. The results of analytical formula calculations are compared with the solutions of boundary value problems in terms of the creep and viscoplasticity theories obtained in the ANSYS software environment. The material constant values are determined from the results of uniaxial tests and test forming of Ti–6Al–4V titanium alloy. It is shown that test forming used to identify the material model provides much more appropriate results with the evaluation error reduced from ~20 % (when identifying the model based on the results of standard uniaxial mechanical tests) to ~3 %.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сверхпластическая формовка</kwd><kwd>краевая задача</kwd><kwd>титанового сплава ВТ6 (Ti–6Al–4V)</kwd><kwd>математическое моделирование</kwd><kwd>технологические параметры</kwd></kwd-group><kwd-group xml:lang="en"><kwd>superplastic forming</kwd><kwd>boundary value problem</kwd><kwd>Ti–6Al–4V titanium alloy</kwd><kwd>analytical modeling</kwd><kwd>technological parameters</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Backofen W.A., Turner I.R., Avery D.H. Superplasticity in an Al Zn alloy // Trans. ASM. 1964. Vol. 57. 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