Details
| Original language | English |
|---|---|
| Article number | 113578 |
| Journal | Materials and design |
| Volume | 251 |
| Early online date | 6 Jan 2025 |
| Publication status | Published - Mar 2025 |
Abstract
Corrosion of offshore support structures can reduce the estimated fatigue life. Pitting corrosion, in particular, is known to lead to local stress concentrations and thus reduce their service life. However, offshore support structures consist of a large number of weld seams, which already have their own stress concentrations and interact with pitting corrosion. So far, there have been no studies on how corrosion can influence the stress concentrations on a long-term basis. In this study, butt- and fillet-welded specimens were exposed to corrosion in a salt spray chamber for up to 12 months and their geometrical development was examined using 3D scans. In addition, hardness and residual stress measurements were carried out. The results were compared to specimens, which were corroded for 12 months in artificial seawater. It could be shown that corrosion causes the notches of the butt welds to become sharper over time, while the fillet welds become narrower. It could be also shown that despite existing scatter, the residual stresses do not change significantly over time. The hardness measurements revealed that although there are no significant changes in the hardness values, the location of the sharpest notch shifted repeatedly within the weld metal, heat affected zone, and base material, which had different hardness values.
Keywords
- Corrosion fatigue, Digital scans, Hardness, Offshore-wind, Residual stress, Stress concentrations, Welds
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials and design, Vol. 251, 113578, 03.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Impact of accelerated corrosion on weld geometry, hardness and residual stresses of offshore steel joints over time
AU - Shojai, Sulaiman
AU - Schönamsgruber, Finn
AU - Köhler, Markus
AU - Ghafoori, Elyas
N1 - Publisher Copyright: © 2025 The Author(s)
PY - 2025/3
Y1 - 2025/3
N2 - Corrosion of offshore support structures can reduce the estimated fatigue life. Pitting corrosion, in particular, is known to lead to local stress concentrations and thus reduce their service life. However, offshore support structures consist of a large number of weld seams, which already have their own stress concentrations and interact with pitting corrosion. So far, there have been no studies on how corrosion can influence the stress concentrations on a long-term basis. In this study, butt- and fillet-welded specimens were exposed to corrosion in a salt spray chamber for up to 12 months and their geometrical development was examined using 3D scans. In addition, hardness and residual stress measurements were carried out. The results were compared to specimens, which were corroded for 12 months in artificial seawater. It could be shown that corrosion causes the notches of the butt welds to become sharper over time, while the fillet welds become narrower. It could be also shown that despite existing scatter, the residual stresses do not change significantly over time. The hardness measurements revealed that although there are no significant changes in the hardness values, the location of the sharpest notch shifted repeatedly within the weld metal, heat affected zone, and base material, which had different hardness values.
AB - Corrosion of offshore support structures can reduce the estimated fatigue life. Pitting corrosion, in particular, is known to lead to local stress concentrations and thus reduce their service life. However, offshore support structures consist of a large number of weld seams, which already have their own stress concentrations and interact with pitting corrosion. So far, there have been no studies on how corrosion can influence the stress concentrations on a long-term basis. In this study, butt- and fillet-welded specimens were exposed to corrosion in a salt spray chamber for up to 12 months and their geometrical development was examined using 3D scans. In addition, hardness and residual stress measurements were carried out. The results were compared to specimens, which were corroded for 12 months in artificial seawater. It could be shown that corrosion causes the notches of the butt welds to become sharper over time, while the fillet welds become narrower. It could be also shown that despite existing scatter, the residual stresses do not change significantly over time. The hardness measurements revealed that although there are no significant changes in the hardness values, the location of the sharpest notch shifted repeatedly within the weld metal, heat affected zone, and base material, which had different hardness values.
KW - Corrosion fatigue
KW - Digital scans
KW - Hardness
KW - Offshore-wind
KW - Residual stress
KW - Stress concentrations
KW - Welds
UR - http://www.scopus.com/inward/record.url?scp=85215985006&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2024.113578
DO - 10.1016/j.matdes.2024.113578
M3 - Article
AN - SCOPUS:85215985006
VL - 251
JO - Materials and design
JF - Materials and design
SN - 0264-1275
M1 - 113578
ER -