Fatigue design of welded double-sided T-joints and double-sided cruciform joints in steel marine structures
A total stress concept
Y. Qin (TU Delft - Marine and Transport Technology)
Henk Besten (TU Delft - Ship Hydromechanics and Structures)
Saloni Palkar (TU Delft - Ship Hydromechanics and Structures)
Miroslaw Lech Kaminski (TU Delft - Ship Hydromechanics and Structures)
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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.
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