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Analysis of thermoelastic problems in isotropic solids undergoing large temperature changes based on novel models of thermoelasticity

机译：基于新型热弹性模型的各向同性固体热弹性问题分析

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摘要

The accurate information of the thermal stresses and temperature in isotropic elastic solids is the key for many engineering applications. At present the classical linear coupled theory of thermoelasticity deduced with the assumptions of small temperature changes is widely used to solve the thermoelastic problems in engineering. In this paper, to describe the thermoelastic behavior in isotropic solids undergoing large temperature changes more accurately, the novel coupled models of thermoelasticity and the corresponding finite element models have been presented explicitly and validated by experimental measurement. The effect of large temperature changes on the solutions of thermoelastic problems is discussed. For the heat transfer process, if the isotropic elastic solids will expand when heated and contract when cooled and the condition (dE)/(EdT)·(δ_(ij)/E)- (δ_(ij)/(1-2v))α ＜ 0 can be met in the context of small deformations, the effect of large temperature changes can be regarded as increasing the specific heat. The proposed models are applied to solve two thermoelastic problems. From the obtained numerical results, the effect of large temperature changes will increase with the amplitude of temperature change and may be considerably even when the temperature changes slowly.
机译：各向同性弹性固体中热应力和温度的准确信息是许多工程应用的关键。目前，随着较小温度变化的假设推断出推导的热弹性的经典线性耦合理论被广泛用于解决工程中的热弹性问题。在本文中，为了更准确地描述大温度变化的各向同性固体中的热弹性行为，通过实验测量明确地呈现了热弹性的新耦合模型和相应的有限元模型。讨论了大温变化对热弹性问题溶液的影响。对于传热过程，如果在冷却时的加热和收缩时各等渗弹性固体和条件（DE）/（EDT）·（Δ_（IJ）/ E） - （Δ_（IJ）/（1-2V）时，则）α<0可以在小变形的上下文中满足，可以将大的温度变化的效果视为增加比热量。所提出的模型用于解决两个热弹性问题。从获得的数值结果来看，随着温度变化的幅度，大的温度变化的效果将增加，并且即使在温度缓慢变化时也可以显着增加。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121576.1-121576.15|共15页
  • 作者

    Heng Liang Zhang; Seonho Kim; Geehong Choi; Dan Mei Xie; Hyung Hee Cho;

  • 作者单位

    Hydraulic Machinery Transients Key Laboratory of Ministry of Education School of Power and Mechanical Engineering Wuhan University Wuhan China 430072 Department of Mechanical Engineering YonseiUniversity Seoul Korea 120749;

    Department of Mechanical Engineering YonseiUniversity Seoul Korea 120749;

    Department of Mechanical Engineering YonseiUniversity Seoul Korea 120749;

    Hydraulic Machinery Transients Key Laboratory of Ministry of Education School of Power and Mechanical Engineering Wuhan University Wuhan China 430072;

    Department of Mechanical Engineering YonseiUniversity Seoul Korea 120749;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coupled theory of thermoelasticity; Large temperature changes; Thermoelastic behavior;

    机译：耦合热弹性理论;温度变化大;热弹性行为;

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