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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">izvuzmath</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3446</issn><issn pub-type="epub">2076-4626</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/0021-3446-2026-3-78-92</article-id><article-id custom-type="elpub" pub-id-type="custom">izvuzmath-278</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Уточненные нелинейные модели деформирования по цилиндрической форме пластин из волокнистых композитов. 2. Модель третьего порядка точности</article-title><trans-title-group xml:lang="en"><trans-title>Refined nonlinear deformation models of cylindrical shape for fibre-reinforced composite plates. 2. Third-order model of accuracy</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>Паймушин</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Paimushin</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Виталий Николаевич Паймушин</p><p>ул. К. Маркса, д. 10, г. Казань, 420111, </p><p>ул. Кремлевская, д. 18, г. Казань, 420008</p></bio><bio xml:lang="en"><p>Vitaliy Nikolaevich Paimushin</p><p>10 K. Marks str., Kazan, 420111,</p><p>18 Kremlyovskaya str., Kazan, 420008 </p></bio><email xlink:type="simple">vpajmushin@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>Макаров</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Makarov</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Максим Викторович Макаров</p><p>ул. Кремлевская, д. 18, г. Казань, 420008, </p><p>ул. К. Маркса, д. 10, г. Казань, 420111</p></bio><bio xml:lang="en"><p>Maksim Viktorovich Makarov</p><p>18 Kremlyovskaya str., Kazan, 420008,</p><p>10 K. Marks str., Kazan, 420111</p><p> </p></bio><email xlink:type="simple">makarovmaksim@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>Левшонкова</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Levshonkova</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Наталья Витальевна Левшонкова</p><p>ул. К. Маркса, д. 10, г. Казань, 420111</p></bio><bio xml:lang="en"><p>Natalya Vitalievna Levshonkova</p><p>10 K. Marks str., Kazan, 420111</p></bio><email xlink:type="simple">dsm@dsm.kstu-kai.ru</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>Шишов</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shishov</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Максим Александрович Шишов</p><p>ул. К. Маркса, д. 10, г. Казань, 420111</p></bio><bio xml:lang="en"><p>Maksim Aleksandrovich Shishov</p><p>10 K. Marks str., Kazan, 420111</p></bio><email xlink:type="simple">maxim.shishov@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Казанский национальный исследовательский технический университет им. А.Н. Туполева;&#13;
Казанский федеральный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tupolev Kazan National Research Technical University;&#13;
Kazan Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Казанский федеральный университет;&#13;
Казанский национальный исследовательский технический университет им. А.Н. Туполева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University;&#13;
Tupolev Kazan National Research Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Казанский национальный исследовательский технический университет им. А.Н. Туполева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tupolev Kazan National Research Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>12</day><month>04</month><year>2026</year></pub-date><volume>0</volume><issue>3</issue><fpage>78</fpage><lpage>92</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Паймушин В.Н., Макаров М.В., Левшонкова Н.В., Шишов М.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Паймушин В.Н., Макаров М.В., Левшонкова Н.В., Шишов М.А.</copyright-holder><copyright-holder xml:lang="en">Paimushin V.N., Makarov M.V., Levshonkova N.V., Shishov M.A.</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://izvuzmath.elpub.ru/jour/article/view/278">https://izvuzmath.elpub.ru/jour/article/view/278</self-uri><abstract><p>На основе известных подходов и в развитие полученных ранее результатов пред­ложена уточненная математическая модель для описания процесса нелинейного деформи­рования по цилиндрической форме пластин из волокнистых композитов, основанная на ап­проксимации тангенциальных перемещений полиномом третьей степени по поперечной ко­ординате, в которой соответствующие коэффициенты разложения считаются независимы­ми, а прогибы — линейным законом. Кинематические соотношения для определения компо­нент деформаций построены на основе предложенных ранее непротиворечивых геометриче­ски нелинейных соотношений теории упругости с сохранением слагаемых, позволяющих вы­явить классические изгибные и неклассические (в частности, поперечно-сдвиговые в условиях поперечного изгиба) формы потери устойчивости (ФПУ) пластины. Физически нелинейное поведение материала учитывается в соотношениях для поперечных касательных напряжений. Рассмотрены вопросы корректности построенных уравнений при формулировке тех или иных условий закрепления и нагружения торцевых сечений пластины. Показано, что в решениях, определяемых на основе построенных уравнений, при удовлетворении граничным условиям защемления поперечного сечения в его окрестности осуществляется переход к решению по модели С.П. Тимошенко с постоянным по толщине поперечным касательным напряжением. Данный вывод сформулирован исходя из анализа точного аналитического решения линейной задачи о поперечном изгибе по цилиндрической форме консольно закрепленной пластины.</p></abstract><trans-abstract xml:lang="en"><p>Based on the known approaches and in development of the previously obtained results, a refined mathematical model is proposed for describing the process of nonlinear deformation along the cylindrical shape of fibrous composite plates, based on the approximation of tangential displacements by a third-degree polynomial along the transverse coordinate, in which the correspon­ding expansion coefficients are considered independent, and the deflections are considered to be a linear law. Kinematic relations for determining the deformation components are constructed based on the previously proposed consistent geometrically nonlinear relations of the elasticity theory with conservation of terms, which make it possible to identify classical bending and non-classical (in particular, transverse-shear under transverse bending conditions) forms of loss of stability of the plate. Physically nonlinear behavior of the material is taken into account in the relations for transverse tangential stresses. The issues of correctness of the constructed equations in formulating certain conditions of fastening and loading of the end sections of the plate are considered. It is shown that in the solutions determined on the basis of the constructed equations, when satisfying the boundary conditions of clamping the cross-section in its vicinity, a transition to a solution according to the S.P. Timoshenko model with a constant transverse tangential stress across the thickness is realized. This conclusion is formulated based on the analysis of the exact analytical solution of the linear problem of transverse bending along the cylindrical shape of a cantilever-fixed plate.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>пластина</kwd><kwd>композит</kwd><kwd>модель третьего порядка</kwd><kwd>геометрическая нелиней¬ность</kwd><kwd>консольно закрепленная пластина</kwd><kwd>изгиб</kwd><kwd>точное аналитическое решение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>plate</kwd><kwd>composite</kwd><kwd>third-order model</kwd><kwd>geometric nonlinearity</kwd><kwd>cantilever plate</kwd><kwd>bending</kwd><kwd>exact analytical solution</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Минобрнауки России (про¬ект FZSU-2024-0010, разделы 1-5) и за счет средств Российского научного фонда (проект №23-19- 00021-П, раздел 6)</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">Амбарцумян С.А. 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