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Publications
Jiao, D., Dong, Y., Chen, H. and Garbatov, Y. (2025), Fatigue strength assessment of stiffened welded tubular joints based on effective notch concept, Innovations in the Analysis and Design of Marine Structures, Garbatov, Y. & Guedes Soares C. (Eds.), Taylor & Francis, London, UK, 169-176.
The floating platforms designed for offshore renewable energy typically consist of multiple large columns that are joined by tubular braces. The connection between the braces and columns utilises a stiffened welded tubular joint, which is susceptible to fatigue due to the presence of geometrical discontinuity. Experimental findings suggest that the weld root could be the primary site for fatigue crack initiation in stiffened welded tubular joints. The effective notch concept was applied for evaluating fatigue strength. The effective notch stresses at various potential fatigue crack initiation locations are calculated using the finite element method, while effective notch strains are assessed through Glinka’s method, which translates elastic stresses into elastic-plastic strains. The results from the assessment show that the effective notch strain method can evaluate the fatigue strength of both the weld root and toe across low and high cycle fatigue regimes. It is concluded that the estimation of effective notch strain is material-dependent if the effective notch stress is substantial.
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