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Temperature dependent representation for Chaboche kinematic hardening model

机译:Chaboche运动硬化模型的温度相关表示

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The assessment of high temperature components under cyclic deformation conditions increasingly relies on determinations of the stress-strain state at the critical location using nonlinear finite element analysis. An important consideration in such finite element simulations is the used constitutive model. The Chaboche model has been widely accepted as an advanced model for such applications. This study evaluates the variation of Chaboche model parameters with temperature for low cycle fatigue conditions and introduces an approach to systematically calibrate the model for a range of temperatures, rather than for single temperatures. Furthermore, mathematical representations have been proposed to consider the effect of superimposed creep deformation on the Chaboche model parameters. Successful application of the proposed approach/formulation for representing the behaviour of a 10%Cr steel under low cycle fatigue and cyclic/hold deformation conditions for the temperature range of 20-625 degrees C is presented.
机译:在循环变形条件下对高温分量的评估越来越依赖于使用非线性有限元分析确定临界位置处的应力-应变状态。在这种有限元模拟中,一个重要的考虑因素是所使用的本构模型。 Chaboche模型已被广泛接受为此类应用程序的高级模型。这项研究评估了低循环疲劳条件下Chaboche模型参数随温度的变化,并介绍了一种在一定温度范围而不是单个温度下系统校准模型的方法。此外,已提出数学表示法来考虑叠加蠕变变形对Chaboche模型参数的影响。提出的方法/配方可成功地代表10%Cr钢在20-625摄氏度温度范围内的低循环疲劳和循环/保持变形条件下的行为。

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