期刊
ENGINEERING FRACTURE MECHANICS
卷 241, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2020.107376
关键词
Mixed mode loading; Fatigue crack growth; Overload; Retardation; Residual stress redistribution
类别
This study focused on the fatigue crack growth behavior of welded joints under various loading scenarios, finding that the crack growth retardation behavior is sensitive to post-welding heat treatments. A modification to the Wheeler model was proposed to improve the accuracy of retardation prediction after applying a mixed mode overload.
Since welded joints in structures are known to be critical regions for crack initiation and growth, study of fatigue crack growth behavior of welded joints under various loading scenarios are essential. In present study, two groups of experiments were conducted. At first, fatigue crack growth behavior of Al5083 butt welded joint subjected to mixed mode loading with constant amplitude has been studied. Afterwards, fatigue crack growth behavior of butt welded joints subjected to mixed mode single overload has been investigated. The sensitivity of the crack growth retardation behavior to post-welding heat treatments was also studied. Considering the effect of residual stress on fatigue crack growth, a modification to the Wheeler model was proposed to improve the accuracy of retardation prediction after applying a mixed mode overload.
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