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<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Archiving and Interchange DTD with OASIS Tables with MathML3 v1.4 20241031//EN" "https://jats.nlm.nih.gov/archiving/1.4/JATS-archive-oasis-article1-4-mathml3.dtd">
<article xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" dtd-version="1.4" article-type="research-article" xml:lang="en"><front><journal-meta><journal-title-group><journal-title xml:lang="ru">Проблемы прочности и пластичности</journal-title></journal-title-group><issn publication-format="print">1814-9146</issn></journal-meta><article-meta><article-id pub-id-type="doi">10.32326/1814-9146-2026-88-2-34-44</article-id><article-categories><subj-group><subject>Other</subject></subj-group></article-categories><title-group><article-title xml:lang="ru">ЦЕЛЫЕ РАЦИОНАЛЬНЫЕ ГЕМИТРОПНЫЕ КУБИЧЕСКИЕ ПОЛУИНВАРИАНТЫ СИСТЕМЫ ДВУХ АСИММЕТРИЧНЫХ ТЕНЗОРОВ ВТОРОГО РАНГА</article-title><trans-title-group xml:lang="en"><trans-title>INTEGER RATIONAL HEMITROPIC CUBIC SEMIINVARIANTS FOR A SYSTEM OF TWO ASYMMETRIC SECOND RANK TENSORS</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Мурашкин</surname><given-names>Е.В.</given-names></name><name xml:lang="en"><surname>Murashkin</surname><given-names>E.V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><email>evmurashkin@gmail.com</email></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Радаев</surname><given-names>Ю.Н</given-names></name><name xml:lang="en"><surname>Radayev</surname><given-names>Yu.N.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><email>radayev@ipmnet.ru</email></contrib><aff-alternatives id="aff1"><aff xml:lang="en"><institution>Ishlinsky Institute for Problems in Mechanics RAS (Moscow, Russia, Russian Federation)</institution></aff><aff xml:lang="ru"><institution>Институт проблем механики им. А.Ю. Ишлинского РАН (Москва, Российская Федерация)</institution></aff></aff-alternatives></contrib-group><pub-date pub-type="epub" iso-8601-date="2026-06-30"><day>30</day><month>06</month><year>2026</year></pub-date><volume>88</volume><issue>2</issue><fpage>34</fpage><lpage>44</lpage><permissions><license xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:title="CC BY 4.0"><ali:license_ref>https://creativecommons.org/licenses/by/4.0/</ali:license_ref><license-p xml:lang="ru">CC BY 4.0</license-p></license></permissions><self-uri xlink:href="http://ppp.mech.unn.ru/index.php/ppp/article/view/947" xlink:title="http://ppp.mech.unn.ru/index.php/ppp/article/view/947">http://ppp.mech.unn.ru/index.php/ppp/article/view/947</self-uri><abstract xml:lang="ru"><p>Построены абсолютные инварианты и полуинварианты для системы, состоящей из одного тензора и одного псевдотензора второго ранга в трехмерном пространстве. Приводятся определения индивидуальных и совместных инвариантов и полуинвариантов. Обсуждаются понятия полного неприводимого набора инвариантов и полуинвариантов. Представлены несколько систем индивидуальных инвариантов и формулы Ньютона, связывающие их между собой. Обсуждаются понятия полных, неполных и неприводимых наборов инвариантов. Отмечается важность теоремы Гамильтона – Келли для минимизации наборов инвариантов с помощью целых рациональных сизигий. Обсуждается понятие псевдотензора. Вводится понятие псевдоскалярной единицы и скалярной функции, вычисляющей алгебраический вес псевдотензора. Предлагается алгоритм построения полного набора инвариантов заданного целого порядка и его последующая ренумерация. Получен полный неприводимый набор индивидуальных и совместных 9 квадратичных и 28 кубических целых рациональных алгебраических инвариантов и полуинвариантов для системы из одного тензора и одного псевдотензора второго ранга. Вычислены целые алгебраические веса полученных псевдоинвариантов. Отдельно выделены полуинварианты, чувствительные к зеркальным отражениям и инверсиям трехмерного объемлющего евклидова прстранства, таких полуинваринатов оказывается всего 18, среди них 1 линейный, 3 квадратичных и 14 кубических. Указанный выше набор 37 полуинвариантов затем используется для построения кубической энергетической формы, характеризующейся 37 определяющими скалярами/псевдоскалярами (9 линейными и 28 квадратичными) и соответсвующей математической модели нелинейного гемитропного микрополярного упругого тела. Получены определяющие уравнения нелинейного гемитропного микрополярного тела, включающие в себя квадратичные поправки.</p></abstract><abstract xml:lang="en" abstract-type="summary"><p>The present study deals with absolute invariants and semi-invariants for a system comprising one second-rank tensor and one second-rank pseudotensor in three-dimensional space. Definitions are provided for individual and joint invariants as well as semi-invariants. The concepts of a complete irreducible set of invariants and semi-invariants are discussed. Several systems of individual invariants are presented, along with Newton's formulas that interrelate them. The notions of complete, incomplete, and irreducible sets of invariants are examined. The significance of the Cayley – Hamilton theorem for minimizing invariant sets via integral rational syzygies is emphasized. The concept of a pseudotensor is elucidated. The notions of a pseudoscalar unit and a scalar function that computes the algebraic weight of a pseudotensor are introduced. An algorithm is proposed for constructing a complete set of invariants of a prescribed integer order, followed by their renumbering. A complete irreducible set of individual and joint integral rational algebraic invariants and semi-invariants-comprising 9 quadratic and 28 cubic elements – is obtained for a system consisting of one tensor and one pseudotensor of second rank. The integral algebraic weights of the resulting pseudoinvariants are computed. Among these, the semi-invariants sensitive to mirror reflections and inversions of the three-dimensional ambient Euclidean space are singled out; there are 18 such semi-invariants in total: 1 linear, 3 quadratic, and 14 cubic. The specified set of 37 semi-invariants is subsequently employed to construct a cubic energetic form characterized by 37 constitutive scalars/pseudoscalars (9 linear and 28 quadratic) and the corresponding mathematical model of a nonlinear hemitropic micropolar elastic solid. The constitutive equations of the nonlinear hemitropic micropolar body, incorporating quadratic corrections, are derived.</p></abstract><kwd-group xml:lang="ru"><kwd>псевдотензор</kwd><kwd>микрополярный гемитропный континуум</kwd><kwd>полуинвариант</kwd><kwd>определяющий псевдоскаляр</kwd><kwd>нелинейный микрополярный континуум</kwd><kwd>кубическая энергетическая форма</kwd></kwd-group><kwd-group xml:lang="en"><kwd>cubic energy form</kwd><kwd>pseudotensor</kwd><kwd>micropolar hemitropic continuum</kwd><kwd>semi-invariant</kwd><kwd>constitutive pseudoscalar</kwd><kwd>nonlinear micropolar continuum</kwd></kwd-group></article-meta></front><back><ref-list><ref id="ref1"><mixed-citation publication-type="other" xml:lang="ru">Гуревич Г.Б. Основы теории алгебраических инвариантов. М.–Л.: ГИТТЛ, 1948. 408 с.</mixed-citation></ref><ref id="ref2"><mixed-citation publication-type="other" xml:lang="ru">Спенсер Э. Теория инвариантов. 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