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首页> 外文期刊>Journal of thermal stresses >CAPABILITY FOR CAPTURING TEMPERABILITY AS A CRITERION FOR THE VALIDITY OF THERMOVISCOELASTIC CONSTITUTIVE EQUATIONS
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CAPABILITY FOR CAPTURING TEMPERABILITY AS A CRITERION FOR THE VALIDITY OF THERMOVISCOELASTIC CONSTITUTIVE EQUATIONS

机译：捕捉温度的能力作为热粘弹性本构方程有效性的标准

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摘要

The presence of varying temperature fields together with both elastic and viscous properties result in significant stress variations during temperature changes in mechanical and structural members made of viscoelastic materials. Such members when subjected to sudden cooling (tempering) may exhibit residual stresses that have important effects on the operational behaviour of the member, including effects such as changes on fatigue life and on fracture toughness. Accurate modelling the transient and residual mechanical response for such materials has important implications in both reliable design and reliable analyses. In this regard, a crucial role is played by the choice of the chosen constitutive equations that together with other fundamental equations of mechanics will determine the mechanical response of a given mechanical member. In this work it is postulated that constitutive equations used to compute the mechanical response of thermoviscoelastic media in order to be considered valid, must be able to reasonably capture the formation of residual stresses. On this basis, two published thermoviscoelastic constitutive equations, of thermorheologically simple class, are examined in terms of their capability for predicting the residual stresses in a long cylinder of float glass subjected to sudden cooling. It is shown that one of the tested theories complies with the proposed validity test while the other fails to reasonably predict the magnitude of the stated residual stresses.
机译：在由粘弹性材料制成的机械构件和结构构件的温度变化过程中，温度场的变化以及弹性和粘性性质的存在会导致应力的显着变化。这种构件在突然冷却（回火）时可能表现出残余应力，这些残余应力对构件的操作行为具有重要影响，包括诸如疲劳寿命和断裂韧性变化的影响。对此类材料的瞬态和残余机械响应进行准确建模，对可靠的设计和可靠的分析都具有重要意义。在这方面，选择本构方程的选择起着至关重要的作用，本构方程与其他力学基本方程一起确定给定机械构件的机械响应。在这项工作中，假设为了计算热粘弹性介质的机械响应而使用的本构方程必须有效地捕捉残余应力的形成，才能被认为是有效的。在此基础上，检查了两个已公开的热流变简单类热粘弹性本构方程，它们具有预测在突然冷却的浮法长筒中的残余应力的能力。结果表明，一种测试理论符合提出的有效性测试，而另一种则无法合理地预测所述残余应力的大小。

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