两种状态方程参数的计算

在一定程度上,状态方程的形式与外推数据的置信度有直接影响,对于在高压下发生反应的材料,通过外推方式计算其未反应状态具有一定的意义。依据由Vinet以及Parsafar和Mason(简称P-M)等人提出的两种统一状态方程,对以其为等温压缩线的完全状态方程进行了研究。根据对热力学状态量的分析,从热压系数和定容比热入手,对完全状态方程的建立进行了讨论,给出了在已知物质等温线条件下构成状态方程的方法,并推导了Vinet和P-M两种表达式的完全状态方程形式。以几种材料为例,通过实验测量的冲击绝热线和有关参数,采用最小二乘法,对其状态方程进行了拟合。结果表明,由冲击绝热线拟合的状态方程与实验结果相吻合。     

Thermomechanical properties of smart composites

The smart composite materials reinforced by SMA show a high performance and special deformation behavior. The thermomechanical constitutive formulas of the composites are derived by means of Eshelby's equivalent inclusion method and Mori-Tanaka's mean field concept. The interaction between the inclusion and crack and toughening mechanism are considered and the energy release rate of a crack in the smart composite is calculated. This work shows that there are the multiple mechanisms contributing to the toughening of the smart composite materials reinforced by SMA.This project is supported by the National Natural Science Foundation of China.     

On Three-Dimensional Dynamic Problems of Generalized Thermoelasticity

Lord–;Shulman's system of partial differential equations of generalized thermoelasticity [1] is considered, in which the finite velocity of heat propagation is taken into account by introducing a relaxation time constant. General aspects of the theory of boundary value and initial-boundary value problems and representation of solutions by series and quadratures are considered using the method of a potential.     

航天结构热力力学的任务和应用

本文给出航天结构热力力学的应用背景和工作任务．首先讨论它的先决条件:载荷谱和材料特征．其次介绍一些典型的热力力学结构:再入热防护系统,轨道空间结构,以及碳纤维增强复合材料板件．然后,介绍热力力学的工作内容:热分析,经典结构分析,热损伤力学,以及热力力学耦合和结构试验．最后为简单展望．      

Détermination de la réponse asymptotique d'une structure anélastique sous chargement thermomécanique cycliqueDetermination of the asymptotic response of a structure under cyclic thermomechanical loading

A method for the solution of cyclic thermomechanical nonlinear problems is presented: it is a Direct Cyclic Method which is an alternative approach to classical methods. It consists in directly seeking the asymptotic response of an inelastic structure subjected to a periodic thermomechanical loading without following the loading path. It is based on the Large Time Increment Method, the periodicity of the limit state and the Fourier transform. To cite this article: M.H. Maitournam et al., C. R. Mecanique 330 (2002) 703–708.     

Thermomechanical Behavior of Electrically Conducting Solids Exposed to an External Electromagnetic Field

This paper describes a procedure for the mathematical and numerical modeling of the thermomechanical behavior of electrically conducting solid bodies exposed to an external electromagnetic field. The constitutive equations for the electromagnetic field are the Maxwell equations written for the region of the solid body and the ambient medium. The stress-strain state of the solid is described using the relations for nonisothermal elastoplastic flow. The effects of the electromagnetic field on the heat-transfer and deformation processes are taken into account via heat release and ponderomotive forces, respectively. The relations between the electric and magnetic inductions and the corresponding field strengths are considered nonlinear. All physicomechanical parameters of the body material are temperature dependent.__________Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 5, pp. 14–26, September–October, 2005.     

The thermostressed state of electrically conductive bodies subjected to an external electromagnetic field

A technique is proposed for mathematical and numerical modeling of thermomechanical processes in electrically conductive bodies subjected to an external electromagnetic field. The initial relations for the determination of the electromagnetic field are the Maxwell equations. The stress and strain states of the body are described using the equations of nonisothermal elastoplasticity. The model takes into account the coupling of the electromagnetic and thermal fields. All physical and mechanical parameters of the material depend on temperature. The process of high-temperature induction treatment of a ferromagnetic cylinder is considered as an example __________ Translated from Prikladnaya Mekhanika, Vol. 41, No. 12, pp. 13–25, December 2005.     

智能复合材料的热力学特性

由形状记忆合金丝或颗粒增强的智能复合材料具有特殊的力学性能，本文从理论上预测了智能复合材料的热力学特性。利用Ｅｓｈｅｌｂｙ的等效夹杂原理与Ｍｏｒｉ－Ｔａｎａｋａ的平均场理论导出了本构列式和相变条件，揭示了形状记忆合金在弹性介质约束下的相变机理与过程。     

Analysis of a thermo‐viscoplastic model with Lipschitz continuous constitutive equations

We study a thermo‐mechanical model, where the mechanical inelastic model with a Lipschitz–continuous constitutive relation for the plastic strain is coupled with a heat equation. The main results are the local‐in‐time existence and uniqueness of the solution to the considered model and the existence of the solution for an arbitrarily long time interval for the sufficiently small given data. Copyright © 2013 John Wiley & Sons, Ltd.