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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">vestift</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-технических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physical-technical series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8358</issn><issn pub-type="epub">2524-244X</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8358-2023-68-4-318-330</article-id><article-id custom-type="elpub" pub-id-type="custom">vestift-820</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>ЭНЕРГЕТИКА, ТЕПЛО- И МАССООБМЕН</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>POWER ENGINEERING, HEAT AND MASS TRANSFER</subject></subj-group></article-categories><title-group><article-title>Моделирование тепловых процессов в полупространстве при нагреве движущимся источником с равномерно распределенным тепловым потоком</article-title><trans-title-group xml:lang="en"><trans-title>Simulation of thermal processes in a half-space under heating by a moving source with a uniformly distributed heat flow</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0373-482X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Веремейчик</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Verameichyk</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Веремейчик Андрей Иванович – кандидат физико-математических наук, доцент, доцент кафедры прикладной механики.</p><p>Ул. Московская, 267, 224017, Брест</p></bio><bio xml:lang="en"><p>Andrei I. Verameichyk – Cand. Sci. (Physics and Mathematics), Associate Professor, Associate Professor of the Department of Applied Mechanics.</p><p>267, Moskovskaya Str., 224017, Brest</p></bio><email xlink:type="simple">vai_mrtm@bstu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0818-097X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Холодарь</surname><given-names>Б. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kholodar</surname><given-names>B. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Холодарь Борис Григорьевич – кандидат технических наук, доцент, старший научный сотрудник.</p><p>Ул. Московская, 267, 224017, Брест</p></bio><bio xml:lang="en"><p>Boris G. Kholodar – Cand. Sci. (Engineering), Associate Professor, Senior Researcher.</p><p>267, Moskovskaya Str., 224017, Brest</p></bio><email xlink:type="simple">hbg@list.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Брестский государственный технический университет</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Brest State Technical University</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>08</day><month>01</month><year>2024</year></pub-date><volume>68</volume><issue>4</issue><fpage>318</fpage><lpage>330</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Веремейчик А.И., Холодарь Б.Г., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Веремейчик А.И., Холодарь Б.Г.</copyright-holder><copyright-holder xml:lang="en">Verameichyk A.V., Kholodar B.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://vestift.belnauka.by/jour/article/view/820">https://vestift.belnauka.by/jour/article/view/820</self-uri><abstract><p>Методом приложения мгновенных точечных источников получено решение задачи теплопроводнос ти при поверхностном нагреве тела в форме полупространства движущимся с постоянной скоростью по прямолинейной траектории равномерно распределенным высококонцентрированным тепловым потоком с различной формой пятна нагрева при постоянных теплофизических характеристиках материала. Исследовано влияние режимов температурного нагружения и формы пятна нагрева на тепловые процессы в зоне термического влияния. Построены поверхности и линии уровня температуры для различных моментов времени и скоростных режимов нагружения в разных плоскостях зоны нагрева. Приведены зависимости от времени температур, скоростей нагрева и охлаждения для точек тела. Недостатки используемых методов линейной теплопроводности, отсутствие прямого учета в расчетной схеме зоны поверхностного расплава материала не позволяют достоверно оценивать влияние режимов термообработки на изменение свойств материала, ориентируясь только на уровень максимальной расчетной температуры. В связи с этим структурообразование металла в зоне теплового воздействия предложено связывать с тепловым импульсом, то есть полной тепловой энергией, воспринятой материалом в данной точке тела, а также с введенным в рассмотрение эффективным импульсом структуризации, характеризующим энергию, затрачиваемую на процесс структурных превращений материала, и временем структуризации в точке и некотором объеме тела. Представлены зависимости этих величин от скорости движения и формы пятна нагрева. Рассмотренные подходы могут быть применены к различным металлам и сплавам. Результаты исследований могут использоваться для разработки более эффективных методик определения оптимальных режимов поверхностного упрочнения металлоизделий высокоэнергетическим источником.</p></abstract><trans-abstract xml:lang="en"><p>Using the method of applying instantaneous point sources, a solution was obtained to the problem of heat conduction during surface heating of a body in the form of a half-space by a uniformly distributed highly concentrated heat flux moving at a constant speed along a rectilinear trajectory with a different shape of the heating spot at constant thermophysical characteristics of the material. The effect of temperature loading modes and the shape of the heating spot on thermal processes in the heat-affected zone is studied. The surfaces and lines of the temperature level are constructed for different moments of time and speed loading modes in different planes of the heating zone. Time dependences of temperatures, heating and cooling rates for body points are given. The shortcomings of the methods used for linear thermal conductivity, the lack of direct consideration in the design scheme of the surface melt zone of the material do not allow one to reliably assess the effect of heat treatment modes on changes in material properties, focusing only on the level of the maximum design temperature. In this regard, the structure formation of metal in the zone of thermal action is proposed to be associated with a thermal impulse, i.e. the total thermal energy perceived by the material at a given point of the body, as well as with the effective structurization impulse introduced into consideration, which characterizes the energy spent on the process of structural transformations of the material, and the structurization time at a point and some volume of the body. The dependencies of these values on the speed of movement and the shape of the heating spot are presented. The considered approaches can be applied to various metals and alloys. The research results can be used to develop more effective methods for determining the optimal modes of surface hardening of metal products with a high-energy source.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>теплопроводность</kwd><kwd>температура</kwd><kwd>полупространство</kwd><kwd>пятно нагрева</kwd><kwd>тепловой поток</kwd><kwd>скорость движения пятна</kwd><kwd>тепловой импульс</kwd><kwd>время структуризации</kwd></kwd-group><kwd-group xml:lang="en"><kwd>thermal conductivity</kwd><kwd>temperature</kwd><kwd>half-space</kwd><kwd>heating spot</kwd><kwd>heat flux</kwd><kwd>spot movement velocity</kwd><kwd>thermal impulse</kwd><kwd>structurization time</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">Лазерная и электронно-лучевая обработка материалов / Н. Н. 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