Thermo-mechanical fatigue testing and simulation using a viscoplasticity model for a P91 steel
Thermo-mechanical fatigue testing and simulation using a viscoplasticity model for a P91 steel
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DOI：
10.1016/j.commatsci.2012.01.006
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发表时间：
2012-04
影响因子：
3.3
通讯作者：
C. Hyde;Wei Sun;T. Hyde;A. A. Saad-A.
中科院分区：
文献类型：
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作者：
C. Hyde;Wei Sun;T. Hyde;A. A. Saad-A.
对P91电厂钢在等温、同相和异相、温度-应变循环条件下进行了循环热机械试验。利用实验数据，建立了用Chaboche模型描述材料响应的等温条件下精确测定材料常数的优化程序。研究发现，该材料在整个寿命周期内都表现出循环软化现象，这可能与材料的微观组织演变和微裂纹扩展有关。所建立的模型对循环应力应变行为和循环软化具有良好的预测能力。
An experimental programme of cyclic thermo-mechanical testing for a P91 power plant steel, under isothermal, and in-phase and out-of-phase thermo-mechanical, temperature-strain cycle conditions, has been implemented. Using the experimental data, an optimisation procedure has been developed for the accurate determination of the material constants under isothermal conditions, in which the Chaboche model is employed to describe material responses. The material was found to exhibit cyclic softening throughout the full life cycles, which is believed to be related to the evolution of microstructure and the propagation of micro-cracks. The model developed shows good predictive capability of cyclic stress–strain behaviour and cyclic softening.