Abstract In this paper, the analysis of the low cycle fatigue behavior of P91 steel is presented. First, experimental tests are performed to recognize different aspects of material behavior. Then an appropriate constitutive model is developed within the framework of thermodynamics of irreversible processes with internal state variables. Two different approaches to fatigue damage modeling are applied comparatively to describe the final stage of material cyclic softening. The material parameters are identified, and the model is validated based on the available experimental data.

中文翻译：

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模拟 P91 钢的热机械循环行为

摘要 本文对P91钢的低周疲劳行为进行了分析。首先，进行实验测试以识别材料行为的不同方面。然后在具有内部状态变量的不可逆过程的热力学框架内开发适当的本构模型。比较应用两种不同的疲劳损伤建模方法来描述材料循环软化的最后阶段。确定材料参数，并根据可用的实验数据验证模型。