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Modelling the strain and stress state under creep conditions in P91 steel

机译:对P91钢在蠕变条件下的应变和应力状态进行建模

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The paper presents original results of standardized long- and short-term creep tests for P91 steel. A modified Garofalo creep equation is proposed which offers a good description of the three stages of creep. The proposed creep equation allows easy determination of all constants that represent the material's actual physical properties. All coefficients of this creep equation are determined using the Levenberg-Marquardt algorithm and they are presented in the paper. The proposed creep equation is a function of stress, which allows its implementation in numerical calculations. The paper shows the presented creep equation application for modelling the strain and stress state in a thick-walled pressure element installed in a power plant.
机译:本文介绍了P91钢标准化的长期和短期蠕变测试的原始结果。提出了改进的Garofalo蠕变方程,该方程很好地描述了蠕变的三个阶段。拟议的蠕变方程可以轻松确定代表材料实际物理特性的所有常数。使用Levenberg-Marquardt算法确定该蠕变方程的所有系数,并在本文中进行介绍。拟议的蠕变方程是应力的函数,可以在数值计算中实现。本文显示了所提出的蠕变方程在建模电厂中安装的厚壁压力元件中的应变和应力状态时的应用。

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