Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 162, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.106982
Keywords
Pipe Joint; Structural strain; Low-cycle Fatigue; Weld Joint; Fatigue analysis
Funding
- National Natural Science Foundation of China [72001039, 12102090]
- Natural Science Foundation of Jiangsu Province [BK20210234]
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This study reevaluates the low-cycle fatigue analysis approach of welded pipelines in the ASME B31 code to understand its underlying mechanism, limitations, and scope. By analyzing two sets of low-cycle fatigue data from piping structures using different strain information, a structural strain method is proposed to generalize the pseudo-stress idea implied in the ASME code.
The welded pipe components are prone to low-cycle fatigue (LCF) at welds, especially under extreme loadings. ASME B31.8 specifies the fatigue design rules of the welded pipelines. In this work, the LCF fatigue analysis approach stipulated in the ASME B31 code is revisited to figure out its underlying mechanism, limitations, and scope, by analyzing two sets of LCF fatigue data of piping structures using different strain information. A structural strain method is proposed to generalize the pseudo-stress idea implied in the ASME code, which correlates large amounts of high- and low-cycle fatigue data of weldments into the master E-N curve.
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