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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">mireabulletin</journal-id><journal-title-group><journal-title xml:lang="ru">Russian Technological Journal</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Technological Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-3210</issn><issn pub-type="epub">2500-316X</issn><publisher><publisher-name>RTU MIREA</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2500-316X-2025-13-2-74-92</article-id><article-id custom-type="edn" pub-id-type="custom">KPQMI</article-id><article-id custom-type="elpub" pub-id-type="custom">mireabulletin-1128</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>МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICAL MODELING</subject></subj-group></article-categories><title-group><article-title>Математическое моделирование процесса горячего изостатического прессования труб из порошковых материалов</article-title><trans-title-group xml:lang="en"><trans-title>Mathematical modeling of hot isotatic pressing of tubes from powder materials</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5413-8625</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Головешкин</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Goloveshkin</surname><given-names>Vasiliy A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Головешкин Василий Адамович, д.т.н., профессор, кафедра высшей математики, Институт кибербезопасности и цифровых технологий;ведущий научный сотрудник</p><p>119454, Москва, пр-т Вернадского, д. 78;125040, Москва, Ленинградский пр-т, д. 7, стр. 1</p><p>Scopus Author ID 6602872377</p></bio><bio xml:lang="en"><p>Vasiliy A. Goloveshkin, Dr. Sci. (Eng.), Professor, Higher Mathematics Department, Institute of Cybersecurity and Digital Technologies; Leading Researcher</p><p>78, Vernadskogo pr., Moscow, 119454; 7-1, Leningradskii pr., Moscow,125040 </p><p>Scopus Author ID 6602872377</p></bio><email xlink:type="simple">vag-1953@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-2483-4392</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Николаенко</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nickolaenko</surname><given-names>Artem A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Николаенко Артем Андреевич, студент</p><p>119454, Москва, пр-т Вернадского, д. 78</p></bio><bio xml:lang="en"><p>Artem A. Nickolaenko, Student</p><p>78, Vernadskogo pr., Moscow, 119454</p></bio><email xlink:type="simple">temanickolaenko2004@yandex.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>Самаров</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Samarov</surname><given-names>Victor N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Самаров Виктор Наумович, д.т.н., технический директор</p><p>117556, Москва, Симферопольский б-р, д. 15</p><p>Scopus Author ID 6603606878</p></bio><bio xml:lang="en"><p>Victor N. Samarov, Dr. Sci. (Eng.), Technical Director</p><p>15, Simferopol’skii bul., Moscow, 117556 </p><p>Scopus Author ID 6603606878</p></bio><email xlink:type="simple">Samarov13@Aol.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>Рейссон</surname><given-names>Ж.</given-names></name><name name-style="western" xml:lang="en"><surname>Raisson</surname><given-names>Gerard</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рейссон Жерар, консультант</p><p>Scopus Author ID 6603152593</p></bio><bio xml:lang="en"><p>Gerard Raisson, Retired Consultant</p><p>Scopus Author ID 6603152593</p></bio><email xlink:type="simple">gerard.raisson@gmail.com</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0008-2857-3499</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фисунова</surname><given-names>Д. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Fisunova</surname><given-names>Daria M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Фисунова Дарья Михайловна, студент</p><p>119454, Москва, пр-т Вернадского, д. 78</p></bio><bio xml:lang="en"><p>Daria M. Fisunova, Student</p><p>78, Vernadskogo pr., Moscow, 119454</p></bio><email xlink:type="simple">daria.fisunova@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>МИРЭА – Российский технологический университет; Институт прикладной механики, Российская академия наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>MIREA – Russian Technological University; Institute of Applied Mechanics, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>МИРЭА – Российский технологический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>MIREA – Russian Technological University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ООО «Лаборатория новых технологий»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Laboratory of new technologies</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Клермон Ферран</institution><country>Франция</country></aff><aff xml:lang="en"><institution>Clermond Ferrand</institution><country>France</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>06</day><month>02</month><year>2025</year></pub-date><volume>13</volume><issue>2</issue><fpage>74</fpage><lpage>92</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Головешкин В.А., Николаенко А.А., Самаров В.Н., Рейссон Ж., Фисунова Д.М., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Головешкин В.А., Николаенко А.А., Самаров В.Н., Рейссон Ж., Фисунова Д.М.</copyright-holder><copyright-holder xml:lang="en">Goloveshkin V.A., Nickolaenko A.A., Samarov V.N., Raisson G., Fisunova D.M.</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.rtj-mirea.ru/jour/article/view/1128">https://www.rtj-mirea.ru/jour/article/view/1128</self-uri><abstract><sec><title>Цели</title><p>Цели. Цель работы – создание модели, которая позволяет с помощью математического моделирования исследовать процесс горячего изостатического прессования (ГИП) длинных труб из порошковых материалов. Напряженно-деформируемое состояние исследуется вдали от верхней и нижней границ капсулы в цилиндрической системе координат, поэтому осевая скорость деформации в каждый момент процесса предполагается постоянной по объему.</p></sec><sec><title>Методы</title><p>Методы. Используются методы математического моделирования. Порошковый материал моделируется как пластически сжимаемая сплошная среда. Для описания его механических свойств в процессе деформации используется модель Грина. Для анализа механического поведения материала капсулы применяется модель идеальной пластичности при условии несжимаемости. Температурное поле предполагается постоянным по объему и по времени в течение всего процесса.</p></sec><sec><title>Результаты</title><p>Результаты. Поскольку, как правило, толщина стенок труб существенно меньше их радиуса, то в процессе исследования принималась гипотеза о постоянстве относительной плотности порошкового материала по объему в каждый момент процесса. Принятая гипотеза позволила свести задачу определения скоростей деформаций на каждом шаге процесса к решению некоторой системы двух уравнений с двумя неизвестными. По известным скоростям деформации определяются скорости перемещений, что позволяет получить конечные размеры трубы (при относительной плотности порошкового материала равной единице). Анализируются усадки всех размеров трубы (вертикального, внутреннего радиуса, наружного радиуса), как функции относительной плотности.</p></sec><sec><title>Выводы</title><p>Выводы. Предложенная модель описания процесса ГИП длинных труб из порошковых материалов позволяет учитывать все особенности данного процесса в зависимости от параметров системы. Показана возможность использования трубчатых образцов для определения функций, входящих в условие Грина.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Objectives</title><p>Objectives. The work set out to create a mathematical model to investigate the process of hot isostatic pressing (HIP) process of long tubes from powder materials in metal capsules. By analyzing the stress-strain state in the areas far from the top and bottom borders in the cylindrical system of coordinates, the axial strain rate at every moment of the process can be considered to be constant through the entire volume.</p></sec><sec><title>Methods</title><p>Methods. Mathematical modeling methods were used to describe mechanical properties in the process of HIP deformation by Green’s model of porous compressible media. The HIP capsule material, which is considered to be non-compressible, is described by the ideal plasticity model. The temperature field is assumed to be uniform over the volume and constant during the time of deformation.</p></sec><sec><title>Results</title><p>Results. The hypothesis of the uniform density over the cross section at each moment of the process was considered during analysis to the extent that the wall thickness of the tube is substantially less than its diameter. This hypothesis allowed us to reduce the task of determining the strain rates at every step of the process to a solution comprising two equations having two variables. When the strain rates are determined, the deformation field is built to obtain the final dimensions of the tube when the powder material is fully consolidated at the end of the HIP process.</p></sec><sec><title>Conclusions</title><p>Conclusions. The proposed model for describing the process hot isostatic pressing of long tubes from powder materials takes all the features of this process into account depending on the system parameters. The possibility of using tubular samples to determine the functions included in the Green’s condition is demonstrated.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>математическое моделирование</kwd><kwd>пластически сжимаемая среда</kwd><kwd>горячее изостатическое прессование</kwd><kwd>порошковый материал</kwd><kwd>условие Грина</kwd><kwd>идеальная пластичность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>mathematical modeling</kwd><kwd>plastically compressible media</kwd><kwd>Hot Isostatic Pressing</kwd><kwd>powder material</kwd><kwd>plastically irreversible compressible media</kwd><kwd>Green’s plasticity criterion</kwd><kwd>ideal plasticity</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">Анохина А.В., Головешкин В.А., Самаров В.Н., Селиверстов Д.Г., Raisson G. 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