Theory of Poisson’s Ratio for a Thermoelastic Micropolar Acentric Isotropic Solid

IF 0.8 Q2 MATHEMATICS Lobachevskii Journal of Mathematics Pub Date : 2024-08-28 DOI:10.1134/s1995080224602480
E. V. Murashkin, Y. N. Radayev
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Abstract

The present paper deals with the triple weights pseudotensor formulation of multivariant thermoelasticity for acentric isotropic micropolar solids. The fundamental concepts of pseudoinvariant volume/area/arc elements of odd integer weights in three-dimensional spaces are discussed. The developed theory of acentric isotropic micropolar thermoelasticity is formulated in terms of contravariant pseudovector of spinor displacements having positive odd algebraic weight and covariant absolute vector of translational displacements. Three energetic forms (H), (E), and (A) of thermoelasticity potential are proposed. The latter is derived from the irreducible system of algebraic invarinats/pseudoinvariants being actually their linear span with coefficients thus allowing us to introduce the conventional thermoelasticity moduli (shear modulus of elasticity, Poisson’s ratio, characteristic nano/microlength, etc.). For others energetic forms thermoelasticity anisotropic micropolar (E) moduli are determined via (A) moduli and then (H) moduli are found in terms of (A) moduli. The triple weights formulation of multivariant constitutive equations for acentric isotropic thermoelastic solid are obtained and analyzed. A comparison of proposed multivariant constitutive equations elucidates the absolute invariance of Poisson’s ratio, i.e., it insensibility to mirror reflections and prohibition of assigning any algebraic weight to this constitutive scalar.

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热弹性微极性同心各向同性固体的泊松比理论
摘要 本文论述了等向各向同性微极性固体的多变量热弹性的三权重伪张量公式。讨论了三维空间中奇数整数权的伪不变体积/面积/弧元的基本概念。用具有正奇数代数权重的旋转位移的协变伪向量和平移位移的协变绝对向量来表述所发展的同心各向同性微极热弹性理论。提出了热弹性势的三种能量形式 (H)、(E) 和 (A)。后者是从代数不变式/伪不变式的不可还原系统中推导出来的,实际上是它们与系数的线性跨度,因此允许我们引入传统的热弹性模量(剪切弹性模量、泊松比、特征纳米/微米长度等)。对于其他能量形式的热弹性各向异性微波(E)模量是通过(A)模量确定的,然后根据(A)模量找到(H)模量。得到并分析了中心各向同性热弹性固体的多变量构成方程的三重权值公式。通过对所提出的多变量构成方程进行比较,阐明了泊松比的绝对不变性,即泊松比不受镜面反射的影响,并禁止对这一构成标量赋予任何代数权重。
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来源期刊
CiteScore
1.50
自引率
42.90%
发文量
127
期刊介绍: Lobachevskii Journal of Mathematics is an international peer reviewed journal published in collaboration with the Russian Academy of Sciences and Kazan Federal University. The journal covers mathematical topics associated with the name of famous Russian mathematician Nikolai Lobachevsky (Lobachevskii). The journal publishes research articles on geometry and topology, algebra, complex analysis, functional analysis, differential equations and mathematical physics, probability theory and stochastic processes, computational mathematics, mathematical modeling, numerical methods and program complexes, computer science, optimal control, and theory of algorithms as well as applied mathematics. The journal welcomes manuscripts from all countries in the English language.
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