期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 143, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.106031
关键词
Creep-fatigue; Crystal plasticity; Life prediction; Damage diagram
资金
- National Key Research and Development Program of China [2018YFC1902404]
- National Natural Science Foundation of China [51725503, 51975214]
- 111 Project
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-02-E00068]
- Postdoctoral Fellowships for Research in Japan by the Japan Society for the Promotion of Science (JSPS) [FY2020 P20350]
In this study, a numerical method based on CPFE was implemented to predict creep-fatigue crack initiation life, and a new life prediction approach was constructed by introducing fatigue and creep indicator parameters. Experimental validation showed high accuracy of the predicted model, providing a potential methodology for conservative creep-fatigue life evaluation in engineering applications.
A numerical process based on crystal plasticity finite element (CPFE) was implemented to predict creep-fatigue crack initiation life. CPFE-based model can describe the macroscopic cyclic deformation and reveal grain-level damage mechanism. A new life prediction approach was then constructed by introducing fatigue and creep indicator parameters. Furthermore, a series of strain-controlled creep-fatigue tests in GH4169 superalloy at 650 degrees C were used to validate predicted accuracy of this model, where most of the data points lied within +/- 1.5 error band. Finally, a potential methodology for conservative creep-fatigue life evaluation was provided by flexible creep-fatigue damage summation rule in engineering applications.
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