期刊
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
卷 186, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcsr.2021.106895
关键词
Welded cast steel joints; Girth butt weld; Structural hot spot stress; Traction stress; 1-mm stress; Equivalent hot spot stress; S-N curves
资金
- National Key R&D Program of China [2017YFC0805100]
- National Natural Science Foundation of China [51578137]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Open Research Fund Program of Jiangsu Key Laboratory of Engineering Mechanics
This paper compared three widely used fatigue stress parameters and proposed the equivalent hot spot stress parameter for fatigue design and data-based analysis of welded cast steel joints. Two S-N curves corresponding to the equivalent hot spot stress and the 1-mm stress were provided for fatigue-based life evaluation.
Understanding the weld-root-based fatigue failure of welded cast steel joints is critical, and the fatigue stress parameter corresponding to the S-N curve for the fatigue-derived design of welded cast steel joints still needs to be addressed. In this paper, we compared three widely used fatigue stress parameters, namely, the structural hot spot stress, the traction stress, and the 1-mm stress, for the analysis of different types of welded cast steel joints under various loading conditions. The results indicate that: (1) the structural hot spot stress calculated through linear extrapolation is close to the traction stress proposed by Dong (2001) but is easier to compute; (2) the 1-mm stress performs slightly better in correlating the fatigue data of different joint geometries and loading conditions, but its calculation requires more effort; and (3) finally, the equivalent hot spot stress parameter is proposed for fatigue design and data-based analysis of welded cast steel joints as it balances computational efficiency and data correction accuracy. Two S-N curves corresponding to the equivalent hot spot stress and the 1-mm stress are provided for the fatigue-based life evaluation of welded cast steel joints.
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