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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">Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Самарского государственного технического университета. Серия «Физико-математические науки»</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1991-8615</issn><issn publication-format="electronic">2310-7081</issn><publisher><publisher-name xml:lang="en">Samara State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">691277</article-id><article-id pub-id-type="doi">10.14498/vsgtu2144</article-id><article-id pub-id-type="edn">DZUMDJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Mechanics of Solids</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Механика деформируемого твердого тела</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">On quadratic corrections of constitutive equations for a hemitropic micropolar elastic solid</article-title><trans-title-group xml:lang="ru"><trans-title>О квадратичных поправках определяющих уравнений для гемитропного микрополярного упругого тела</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3267-4742</contrib-id><contrib-id contrib-id-type="scopus">12760003400</contrib-id><contrib-id contrib-id-type="researcherid">F-4192-2014</contrib-id><name-alternatives><name xml:lang="en"><surname>Murashkin</surname><given-names>Evgenii V.</given-names></name><name xml:lang="ru"><surname>Мурашкин</surname><given-names>Евгений Валерьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Phys. &amp; Math. Sci., PhD, MD, Senior Researcher, Lab. of Modeling in Solid Mechanics</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, старший научный сотрудник, лаб. моделирования в механике деформируемого твердого тела</p></bio><email>murashkin@ipmnet.ru</email><uri>https://www.mathnet.ru/rus/person53045</uri><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0866-2151</contrib-id><contrib-id contrib-id-type="scopus">6602740688</contrib-id><contrib-id contrib-id-type="researcherid">J-8505-2019</contrib-id><name-alternatives><name xml:lang="en"><surname>Radayev</surname><given-names>Yuri N.</given-names></name><name xml:lang="ru"><surname>Радаев</surname><given-names>Юрий Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D.Sc. (Phys. &amp; Math. Sci.), Ph.D., M.Sc., Professor, Leading Researcher, Lab. of Modeling in Solid Mechanics</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, ведущий научный сотрудник, лаб. моделирования в механике деформируемого твердого тела</p></bio><email>radayev@ipmnet.ru</email><uri>https://www.mathnet.ru/rus/person39479</uri><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ishlinsky Institite for Problems in Mechanics, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт проблем механики им. А. Ю. Ишлинского РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-07-21" publication-format="electronic"><day>21</day><month>07</month><year>2025</year></pub-date><volume>29</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>274</fpage><lpage>293</lpage><history><date date-type="received" iso-8601-date="2025-09-24"><day>24</day><month>09</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Authors; Samara State Technical University (Compilation, Design, and Layout)</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Авторский коллектив; Самарский государственный технический университет (составление, дизайн, макет)</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Authors; Samara State Technical University (Compilation, Design, and Layout)</copyright-holder><copyright-holder xml:lang="ru">Авторский коллектив; Самарский государственный технический университет (составление, дизайн, макет)</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/1991-8615/article/view/691277">https://journals.eco-vector.com/1991-8615/article/view/691277</self-uri><abstract xml:lang="en"><p>In the present paper, cubic approximations of energy forms for the potentials of force and couple stresses in hemitropic micropolar elastic solids are proposed and discussed. H/E/A-representations for these potentials were introduced in earlier studies. However, the A-form allows us to obtain a cubic approximation for the stress potential in the form of a polynomial combination of invariants, comprising integer powers of individual and joint base rational algebraic invariants and pseudoinvariants. Some of these pseudoinvariants have “pseudo-tensor pre-images” that are sensitive to mirror reflections and inversions of three-dimensional space.Within the framework of this study, a complete irreducible set of individual and joint linear, quadratic, and cubic integer rational algebraic invariants is obtained for a set consisting of the symmetric and antisymmetric parts of the asymmetric strain tensor and the wryness tensor. A cubic energy form for a hemitropic micropolar solid is determined, and a complete set of 37 constitutive moduli is specified. Additionally, constitutive equations for force and couple stresses in arbitrary curvilinear coordinates are derived, including quadratic corrections.</p></abstract><trans-abstract xml:lang="ru"><p>Исследуются вопросы построения кубических аппроксимаций энергетических форм для потенциалов силовых и моментных напряжений гемитропных микрополярных упругих тел. Ранее были предложены H/E/A-представления для указанных энергетических форм. В частности, А-форма позволяет получить кубическую аппроксимацию потенциала напряжений в виде полиномиальной линейной комбинации рациональных гемитропных инвариантов, некоторые из «псевдотензорных прообразов» которых обладают чувствительностью к зеркальным отражениям и инверсиям трехмерного пространства.В рамках данного исследования получен полный неприводимый набор индивидуальных и совместных гемитропных целых рациональных алгебраических инвариантов для системы, состоящей из симметричных и антисимметричных частей асимметричного тензора деформаций и тензора изгиба-кручения. Полученный набор инвариантов используется для построения кубической энергетической формы гемитропного тела и определения полного набора из 37 определяющих постоянных. Выведены определяющие уравнения для силовых и моментных напряжений, включающие квадратичные поправки и справедливые в произвольной системе криволинейных координат.</p></trans-abstract><kwd-group xml:lang="en"><kwd>algebraic weight</kwd><kwd>pseudotensor</kwd><kwd>nanoscale</kwd><kwd>microscale</kwd><kwd>energy form</kwd><kwd>integer rational algebraic invariant</kwd><kwd>irreducible system of invariants</kwd><kwd>cubic approximation</kwd><kwd>hemitropic micropolar elastic solid</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>алгебраический вес</kwd><kwd>псевдотензор</kwd><kwd>наномасштаб</kwd><kwd>микромасштаб</kwd><kwd>энергетическая форма</kwd><kwd>целочисленный рациональный алгебраический инвариант</kwd><kwd>неприводимая система инвариантов</kwd><kwd>кубическая аппроксимация</kwd><kwd>гемитропное микрополярное упругое тело</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out on the topic of the state assignment (state registration no. 124012500437-9).</funding-statement><funding-statement xml:lang="ru">Работа выполнена по теме государственного задания (государственный регистрационный номер 124012500437-9).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Cosserat E., Cosserat F. 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