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Influence of pitting corrosion on the fatigue strength of offshore steel structures based on 3D surface scans

Shojai, Sulaiman and Schaumann, Peter and Braun, Moritz and Ehlers, Sören (2022) Influence of pitting corrosion on the fatigue strength of offshore steel structures based on 3D surface scans. International Journal of Fatigue, 164. Elsevier. doi: 10.1016/j.ijfatigue.2022.107128. ISSN 0142-1123.

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Official URL: https://reader.elsevier.com/reader/sd/pii/S014211232200384X?token=0694536914FF407C0496005AE59EC88F1C385811481EAC42DA2BCA6E2D48F1ED42C3D79576862EDC549E7F4CD74D2256&originRegion=eu-west-1&originCreation=20221125120518


Support structures for offshore wind turbines and the corresponding transformer platforms are highly susceptible to corrosion. In particular, the phenomenon of pitting is crucial, as it leads to local stress concentrations and thus affects the fatigue life of structures. Despite corrosion protection systems, corrosion cannot be completely avoided, which can lead to pitting corrosion on the steel surface. This leads to fatigue life reduction, since the structures are exposed to high dynamic loads. Local stress concentrations can be considered in local concepts but so far, corrosion effects in local concepts are insufficiently defined. Hence, this paper aims to investigate the impact of pitting corrosion and the corresponding stress concentration on the fatigue life endurance of structural steel, used for offshore wind support structures. For this purpose, a total of 36 pre-corroded specimens with pitting were tested against fatigue failure and monitored with Digital Image Correlation. In addition, the specimens were scanned with a high-resolution 3D scanner and converted to numerical models by reverse engineering, to determine the stress concentrations on the surface. In most cases the hotspots from the numerical model coincide with the crack location detected with Digital Image Correlation. The notch effect has a significant impact on the crack location and crack path.

Item URL in elib:https://elib.dlr.de/190885/
Document Type:Article
Title:Influence of pitting corrosion on the fatigue strength of offshore steel structures based on 3D surface scans
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Shojai, SulaimanUniversität HannoverUNSPECIFIEDUNSPECIFIED
Schaumann, PeterUniversität HannoverUNSPECIFIEDUNSPECIFIED
Braun, MoritzTechnische Universität Hamburghttps://orcid.org/0000-0001-9266-1698UNSPECIFIED
Ehlers, SörenUNSPECIFIEDhttps://orcid.org/0000-0001-5698-9354UNSPECIFIED
Date:November 2022
Journal or Publication Title:International Journal of Fatigue
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Offshore-windCorrosion fatiguePitting corrosion3D-Surface scanReverse engineeringStress concentrations
HGF - Research field:Energy
HGF - Program:other
HGF - Program Themes:E - no assignment
DLR - Research area:Energy
DLR - Program:E - no assignment
DLR - Research theme (Project):E - no assignment
Location: Geesthacht
Institutes and Institutions:Institute of Maritime Energy Systems
Deposited By: Piazza, Hilke Charlotte
Deposited On:02 Dec 2022 09:52
Last Modified:27 Jun 2023 08:37

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