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Department of Civil Engineering, Faculdade de Ciências e Tecnologia, University of Coimbra , Coimbra , Portugal
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Department of Mechanical Engineering, Faculdade de Ciências e Tecnologia, University of Coimbra , Coimbra , Portugal
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Department of Civil Engineering, Faculdade de Ciências e Tecnologia, University of Coimbra , Coimbra , Portugal
Department of Mechanical Engineering, University of Aveiro , Aveiro , Portugal
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Department of Civil Engineering, Faculdade de Ciências e Tecnologia, University of Coimbra , Coimbra , Portugal
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Department of Civil Engineering, Faculdade de Ciências e Tecnologia, University of Coimbra , Coimbra , Portugal
Department of Civil Engineering, Faculdade de Ciências e Tecnologia, University of Coimbra , Coimbra , Portugal
This paper investigates the fatigue performance of a hybrid transitional joint in an I-girder stiffener using DED-Arc AM46 steel from a material and detail perspective. High-cycle fatigue (HCF) tests were performed on machined/polished specimens extracted in horizontal and vertical directions relative to the welding beads. The obtained results were used to define the material S-N curve, showing behavior comparable to conventional S355 steel and a fatigue limit of 371 MPa at 2 million cycles. The hybrid joint was evaluated using linear static finite element analysis and the Theory of Critical Distances. For all analyzed geometries and service load levels, the effective stresses remained below the fatigue limit, indicating infinite life under the considered loading. Experimental validation is required to confirm this behavior under realistic manufacturing conditions.
directed energy deposition-arc, AM46 steel, high-cycle fatigue, S-N curve, hybrid transitional joint, fatigue life
This work was funded by the Research Fund for Coal and Steel under grant agreement 101112614 — IAMFat. This work was also supported by FCT / MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UID/04029/Institute for Sustainability and Innovation in Structural Engineering (ISISE), CEMMPRE under the project UIDB/00285/2020, TEMA under the project UID 00481/2025, and under the Associate Laboratory Advanced Production and Intelligent Systems ARISE under reference LA/P/0112/2020.
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