期刊
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
卷 181, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2020.105685
关键词
Notch; Fatigue; Size effect; Failure probability; Life prediction; Weibull model
资金
- National Natural Science Foundation of China [11972110, 11672070]
- Sichuan Provincial Key Research and Development Program [2019YFG0348]
- Science and Technology Program of Guangzhou, China [201904010463]
- Fundamental Research Funds for the Central Universities [ZYGX2019J040]
- Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education [DESE201901]
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences
Structural integrity assessments with discontinuities are critical for ensuring operational life and reliability of engineering components. In this work, through combining with the generalized local model, a probabilistic framework is proposed for fatigue life assessment of notched components under size effects, in which the Smith-Watson-Topper damage parameter is utilized to characterize the multiaxial stress state at the notch tip. In particular, an effective stress concept is introduced to characterize the inhomogeneous stress distribution within the notch region. Finally, experimental data of TA19 notched specimens with different scales are utilized for model validation and comparison, results show that the proposed framework yields acceptable correlations of predicted fatigue lives with experimental ones.
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