ABSTRACT The current study investigates the mechanical behaviors of P92 steel in the stress-controlled cyclic tensile-loading tests with holding period. First, the testing conditions and some typical experimental results of P92 steel in those kind of tests are reviewed. To simulate the mechanical behaviors of P92 steel, a three-stage creep model is adopted. The material parameters in the model are identified by using the experimental data of pure creep tests, where the low- and high-stress ranges are considered separately. The constitutive equations of the model can be solved through a conventional numerical approach. With the obtained numerical results, the responses of P92 steel samples in the cyclic tensile-loading tests with holding periods can be predicted at a quantitative level. Some key features of the experimental results are also analyzed. Furthermore, the damage evolution property of P92 steel in the tests can be revealed. The current modelling work will be helpful for the residual lifetime evaluation and the safety design of P92 steel components under practical loading conditions.

中文翻译：

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P92 钢在应力控制循环拉伸载荷试验中的力学响应建模与分析

摘要 目前的研究调查了 P92 钢在应力控制循环拉伸载荷试验中的力学行为和保持期。首先，回顾了P92钢在这些试验中的试验条件和一些典型的试验结果。为了模拟 P92 钢的力学行为，采用了三阶段蠕变模型。模型中的材料参数是通过使用纯蠕变试验的实验数据确定的，其中分别考虑了低应力和高应力范围。模型的本构方程可以通过传统的数值方法求解。根据获得的数值结果，可以定量预测 P92 钢样品在具有保持周期的循环拉伸载荷试验中的响应。还分析了实验结果的一些关键特征。此外，还可以揭示 P92 钢在试验中的损伤演化特性。目前的建模工作将有助于P92钢构件在实际载荷条件下的剩余寿命评估和安全设计。