期刊
ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷 28, 期 5, 页码 619-627出版社
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-015-0240-x
关键词
Titanium alloy; Dwell-fatigue; Fatigue; Crack growth
资金
- Youth Foundation of Jiangsu Province Study on the time-scale crack growth rate model used in fatigue life assessment of pressure hull of deep-sea submersibles [BK2012095]
- National Natural Science Foundation of China [51109100, 51439004]
- National Natural Science Foundation for Young Scholars of China [E091002/51109101]
- Shanghai Committee of Science and Technology Projects [14DZ1205500, 14DZ2250900]
The dwell effect of the material can reduce the fatigue lives of titanium alloys at room temperature. A unified fatigue life prediction method developed by the authors' group is modified in this paper to predict dwell-fatigue crack growth taking into account the effects of dwell time and maximum stress. The modified model can be successfully used to predict the crack growth rate and calculate the fatigue life of different titanium alloys under pure fatigue and dwell-fatigue conditions. It is validated by comparing prediction results with the experimental data of several titanium alloys with different microstructures, dwell time, hydrogen contents, stress ratios and stress levels.
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