Journal
MARINE STRUCTURES
Volume 74, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marstruc.2020.102809
Keywords
Welded tubular joints; Fatigue of welds; Offshore wind platform; Residual structural strength; Fatigue testing
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Funding
- European Commission through the Research Fund for Coal and Steel Program [RFSR-2015-00024]
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High-cycle fatigue experiments are performed on welded tubular steel X-joints, with braces and chord of equal diameter. They are scaled-down joints, used extensively in offshore wind platforms. Three different welding procedures are considered in specimen fabrication: manual, fully-automatic and manual with HFMI post-weld treatment. Two possible locations for crack initiation were identified: chord crown and in-between location, also verified by numerical calculations and fractography of failed specimens. Monotonic loading tests on fatigue-cracked specimens showed good performance in terms of ultimate strength and deformation capacity, despite the presence of through-thickness cracks. The results are compared with predictions from relevant design standards.
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