期刊
METALS
卷 10, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/met10030307
关键词
P92 steel; fatigue-creep interaction; unified constitutive model; static recovery; stress relaxation
资金
- National Key R&D Program of China [2018YFC0808800]
- National Natural Science Foundation of China [51905261]
- Natural Science Foundation of Jiangsu Province [BK20190678]
Fatigue-creep interaction (FCI) responses of P92 steel are investigated experimentally and numerically. A series of isothermal FCI experiments with tensile dwell time ranging from 60 to 600 s were conducted at two temperatures under strain-controlled trapezoidal waveform. The experimental responses demonstrate that the peak stress is influenced by temperature and dwell time. In other words, creep-mechanism-influenced stress relaxation during dwell time influences the peak stress and fatigue life (N-f). In addition, effects of strain range on peak stress and fatigue life under fatigue-creep loading are evaluated. Towards developing a simulation-based design methodology for high temperature components, first a conventional unified constitutive model is evaluated against the P92 steel experimental responses. Based on the simulation deficiency of the conventional model, a modified static recovery term incorporated in the kinematic hardening rule is proposed and satisfactory simulations of the P92 steel FCI responses are demonstrated. The experimental responses of P92 steel and strengths and deficiencies of the conventional and modified Chaboche models are elaborated identifying the important FCI phenomena and progress in constitutive model development for FCI response simulation.
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