期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 120, 期 -, 页码 228-240出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2018.11.018
关键词
Thermomechanical fatigue (TMF); Multiaxial fatigue; Phase angle; Nickel-based superalloy; Life prediction
资金
- China Natural Science Foundation [11572169, 51775294]
Recent investigations revealed significant differences of thermomechanical fatigue from isothermal fatigue. Quantifying effects of thermomechanical loads in fatigue life assessment is still an open issue. In the present work, extensive experiments are performed for a popular nickel-based superalloy under both isothermal and thermomechanical loading conditions to quantify the influence of varying temperature and multiaxial mechanical loads. Various multiaxial fatigue life models show significant deviations and cannot describe the thermomechanical fatigue life. Based on the experiments and failure analysis a new thermomechanical fatigue model is introduced to assess non-proportional thermomechanical loads and can calibrate thermomechanical multiaxial fatigue reasonably.
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