Mode-{I, III} multiaxial fatigue of welded joints in steel maritime structures

Mode-{I, III} multiaxial fatigue of welded joints in steel maritime structures: Effective notch stress based resistance incorporating strength and mechanism contributions

Bufalari, G. (TU Delft Ship Hydromechanics and Structures)
den Besten, J.H. (TU Delft Ship and Offshore Structures)
Kaminski, M.L. (TU Delft Ship and Offshore Structures)

2024

The response of maritime structures can be multiaxial, involving predominant mode-I and non-negligible mode-III components. Adopting a stress distribution formulation based effective notch stress as fatigue strength parameter for mixed mode-{I, III} multiaxial fatigue assessment purposes, a mode-I equivalent von Mises type of failure criterion has been established at the critical fracture plane. Counting includes a cycle-by-cycle non-proportionality measure and damage accumulation is based on a linear model. Distinguished mode specific and material characteristic strength and mechanism contributions in terms of respectively the resistance curve intercept and mean stress induced response ratio coefficient, resistance curve slope and material characteristic length, have been incorporated. Evaluating the mid-cycle fatigue resistance, the outperformance is impressive. The analysed multiaxial mode-{I, III} data fits the uniaxial mode-I reference data scatter band and a single resistance curve can be used for fatigue assessment.

Effective notch stress
Fatigue
Multiaxiality
Strength and mechanism
Welded joints

http://resolver.tudelft.nl/uuid:563ecf9f-4ef5-435f-9ca1-d211e8871b51

https://doi.org/10.1016/j.ijfatigue.2023.108067

0142-1123

International Journal of Fatigue, 180

Institutional Repository

journal article

© 2024 G. Bufalari, J.H. den Besten, M.L. Kaminski