Mode-III fatigue of welded joints in steel maritime structures
Weld notch shear stress distributions and effective notch stress based resistance
G. Bufalari (TU Delft - Ship Hydromechanics and Structures)
Henk Den Besten (TU Delft - Ship Hydromechanics and Structures)
Mirek L Kaminski (TU Delft - Ship Hydromechanics and Structures)
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Abstract
The predominant mode-I response of maritime structures can be multiaxial, involving out-of-plane mode-III shear components. Semi-analytical mode-III notch stress distribution formulations have been established for critical details like welded T-joints and cruciform joints, reflecting (non-)symmetry with respect to half the plate thickness. Using a stress distribution formulation based effective notch stress as fatigue strength criterion, the mode-III welded joint mid-cycle fatigue resistance characteristics have been investigated. In comparison to mode-I, the material characteristic length and resistance curve slope estimate suggest the fatigue damage process to be even more an initiation related near-surface phenomenon. Mean shear stress effects seem insignificant.
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