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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">Doklady Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Химия, науки о материалах</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-9535</issn><issn publication-format="electronic">3034-5111</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">682479</article-id><article-id pub-id-type="doi">10.31857/S2686953524060043</article-id><article-id pub-id-type="edn">BORSCF</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>PHYSICAL CHEMISTRY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ФИЗИЧЕСКАЯ ХИМИЯ</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">Diffusion Model of Elastic Properties of Fiber Reinforced Plastic in Humidification Conditions</article-title><trans-title-group xml:lang="ru"><trans-title>Диффузионная модель упругих свойств полимерных композиционных материалов во влажной среде</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lebedev</surname><given-names>V. P.</given-names></name><name xml:lang="ru"><surname>Лебедев</surname><given-names>М. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Corresponding Member of the RAS</p></bio><bio xml:lang="ru"><p>Член-корреспондент РАН</p></bio><email>startsev@iptpn.ysn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Startsev</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Старцев</surname><given-names>О. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>startsev@iptpn.ysn.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kornienko</surname><given-names>G. V.</given-names></name><name xml:lang="ru"><surname>Корниенко</surname><given-names>Г. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>startsev@iptpn.ysn.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Larionov Institute of Physical-Technical Problems of the North of Siberian Branch of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">ФИЦ “Якутский научный центр Сибирского отделения Российской академии наук” Институт физико-технических проблем Севера им. В.П. Ларионова Сибирского отделения Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">NRC “Kurchatov Institute” – VIAM</institution></aff><aff><institution xml:lang="ru">Геленджикский центр климатических испытаний ВИАМ им. Георгия Владимировича Акимова — НИЦ “Курчатовский институт”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-20" publication-format="electronic"><day>20</day><month>12</month><year>2024</year></pub-date><volume>519</volume><issue>1</issue><fpage>25</fpage><lpage>31</lpage><history><date date-type="received" iso-8601-date="2025-06-04"><day>04</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/682479">https://journals.eco-vector.com/2686-9535/article/view/682479</self-uri><abstract xml:lang="en"><p>In this paper, there is consideration of a model of the dependence of in-plane shear modulus of the carbon fiber reinforced plastics on the time spent in thermally humid conditions is considered. This study is based on the Academician V.M. Buznik’s ideas of the effect of molecular transformations in polymer matrix on their macroscopic properties. The moisture transfer kinetics and changes of the in-plane shear modulus of the carbon fiber reinforced plastics during drying and humidification at 60°C have been investigated. Fick’s second law was used to approximate the dependence of the shear modulus on time, because of the dependence of mechanical properties on moisture content, which is commonly modeling by this law.</p></abstract><trans-abstract xml:lang="ru"><p>Рассмотрена эмпирическая модель изменения модуля сдвига углепластика от времени пребывания во влажной среде при повышенной температуре (60°C). Исследована кинетика влагопереноса и изменения модуля сдвига в плоскости листа эпоксидного углепластика в режимах сушки и увлажнения при 60°C. Показано, что модуль сдвига материала изменяется закону диффузии Фика с постоянным коэффициентом эффективной диффузии.</p></trans-abstract><kwd-group xml:lang="en"><kwd>carbon fiber reinforced plastic</kwd><kwd>in-plane shear modulus</kwd><kwd>diffusion</kwd><kwd>moisture content</kwd><kwd>plasticization, modeling</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>углепластик</kwd><kwd>модуль сдвига</kwd><kwd>диффузия</kwd><kwd>влагосодержание</kwd><kwd>моделирование</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>24-19-00009</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Buznik V.M., Kablov E.N. // Her. Russ. Acad. Sci. 2017. V. 87. № 5. 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