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- Title
Fatigue design of welded double‐sided T‐joints and double‐sided cruciform joints in steel marine structures: A total stress concept.
- Authors
Qin, Yanxin; Besten, Henk; Palkar, Saloni; Kaminski, Miroslaw Lech
- Abstract
Fatigue is a governing design limit state for marine structures. Welded joints are important in that respect. The weld notch stress (intensity) distributions contain essential information and formulations have been established to obtain a total stress fatigue damage criterion and corresponding fatigue resistance curve; a total stress concept. However, the involved weld load carrying stress model does not provide the required estimates and trends for varying geometry dimensions and loading & response combinations. A new one has been developed and performance evaluation for T‐joints and cruciform joints in steel marine structures shows that in comparison with the nominal stress, hot spot structural stress and effective notch stress concept based results up to 50% more accurate fatigue design life time estimates can be obtained. Taking advantage of the weld notch stress formulations, the effective notch stress concept performance has improved adopting a stress‐averaged criterion rather than a fictitious notch radius‐based one.
- Subjects
OFFSHORE structures; WELDED joints; R-curves; RESIDUAL stresses; FATIGUE life
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2019, Vol 42, Issue 12, p2674
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13089