期刊
ENGINEERING FRACTURE MECHANICS
卷 235, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2020.107150
关键词
Critical distance; Size effect; Fatigue; Notch; Weibull model; Life distribution
类别
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]
Notch features often raise critical influences on fatigue lives of engineering components, which deserve particular attentions for ensuring their structural integrity and reliability. The theory of critical distance provides a simple way to evaluate fatigue lives of notched components without extracting complicated stress fields within the notch vicinities. In this study, a probabilistic model for deducing fatigue life distribution of notched components is established by coupling the Weibull distribution with the theory of critical distance. In addition, the influence of size effect on critical distance values and predicting performance is characterized by two strategies, i.e. average approach and highly stressed volume-based approach. Experimental data of low carbon steel En3B and Al 2024-T351 were utilized for model validation and comparison. Predicted P-S-N curves indicate that the predicted scatter bands using highly stressed volume approach yield better correlations with experimental results than that by the average approach.
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