Effect of Corrosion Damage on the Fatigue Behavior of S460NL High-Strength Steel under Cyclic Loading
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https://orcid.org/0000-0002-4953-4324
Mohammad Sami Al Khazali
Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics, Veveří 331/95, 602 00 Brno, Czech Republic
https://orcid.org/0009-0004-6998-9264
Lucie Malikova
Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics Veveří 331/95, 602 00 Brno, Czech Republic and Czech Academy of Sciences; Institute of Physics of Materials, v. v. i., Žižkova 22, 616 00 Brno, Czech Republic
https://orcid.org/0000-0001-5868-5717
Vít Křivý
VŠB-TU Ostrava, Faculty of Civil Engineering, Ludvíka Podéště 1875, 708 33 Ostrava, Czech Republic
https://orcid.org/0000-0002-7251-2473
Miroslav Vacek
VŠB-TU Ostrava, Faculty of Civil Engineering, Ludvíka Podéště 1875, 708 33 Ostrava, Czech Republic
https://orcid.org/0000-0002-9197-856X
Abstract
The present study investigates the influence of corrosion exposure on the fatigue behavior of S460NL high-strength structural steel, a material that is frequently utilized in offshore and civil engineering structures. Accelerated corrosion was simulated under controlled laboratory conditions for exposure periods of 3 days, 6 days, and 6 + 3 days, in addition to specimens subjected to natural atmospheric corrosion. To this end, fatigue tests were performed to obtain S–N curves, and the results were evaluated using Basquin's law and the probabilistic Castillo–Canteli model.
The findings indicate that corrosion has a substantial impact on fatigue resistance. The endurance limit exhibited a decline from 214 MPa for the reference specimens to 176 MPa following three days of corrosion, 135 MPa after six days, and approximately 92 MPa after combined corrosion exposure, signifying a reduction of up to 57%. Fractographic observations revealed that corrosion pits act as stress concentrators, thereby promoting early crack initiation. A discernible correlation was identified between corrosion mass loss and normalized endurance limit.
These findings highlight the importance of considering corrosion effects in fatigue life assessment and structural design of high-strength steel components.
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Open Data: https://doi.org/10.5281/zenodo.13329896