Print Email Facebook Twitter Mid- and High-Cycle Fatigue of Welded Joints in Steel Marine Structures Title Mid- and High-Cycle Fatigue of Welded Joints in Steel Marine Structures: Effective Notch Stress and Total Stress Concept Evaluations Author Qin, Y. (TU Delft Marine and Transport Technology) den Besten, J.H. (TU Delft Ship Hydromechanics and Structures) Palkar, S.S. (TU Delft Ship Hydromechanics and Structures) Kaminski, M.L. (TU Delft Ship Hydromechanics and Structures) Department Marine and Transport Technology Date 2021 Abstract The characteristic far field response spectrum of welded joints – the governing fatigue sensitive locations in steel marine structures – is predominantly linear elastic, meaning mid- and high-cycle fatigue (MCF and HCF) is most important for design. Using the effective notch stress- and the total stress concept, involving respectively Se and ST as intact- and cracked geometry fatigue strength criterion, one MCF-HCF resistance curve has been obtained for all welded joints. A generalised random fatigue limit model explicitly incorporating the MCF life time and HCF strength limit scatter provides statistically the most accurate fatigue strength and fatigue life time estimates. Similar MCF performance is obtained for Se and ST. Although crack growth dominates the MCF damage process, the results for an initiation related criterion like Se and natural crack growth related criterion like ST are similar. Adopting Se rather than ST as fatigue strength criterion naturally related to the crack initiation dominated HCF region showing the largest data scatter may explain the better effective notch stress concept HCF performance. Since the HCF resistance scatter is relatively large, the MCF-HCF generalised random fatigue limit model design curves show approximately 1-slope behaviour. meaning that for design purposes a linear Basquin model approximation rather than a piecewise continuous bi-linear MCF-HCF formulation according to guidelines, standards and classification notes should be adopted. Subject Effective notch stressMid- and high-cycle fatigueSteel marine structuresTotal stressWelded joints To reference this document use: http://resolver.tudelft.nl/uuid:3ea42d7d-909d-4eac-a0b4-0fce782552a7 DOI https://doi.org/10.1016/j.ijfatigue.2020.105822 ISSN 0142-1123 Source International Journal of Fatigue, 142 Part of collection Institutional Repository Document type journal article Rights © 2021 Y. Qin, J.H. den Besten, S.S. Palkar, M.L. Kaminski Files PDF 1_s2.0_S0142112320303534_main.pdf 6.03 MB Close viewer /islandora/object/uuid:3ea42d7d-909d-4eac-a0b4-0fce782552a7/datastream/OBJ/view