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The impact of corrosion-stress interactions on the topological features and ultimate strength of large-scale steel structures

The impact of corrosion-stress interactions on the topological features and ultimate strength of large-scale steel structures
The impact of corrosion-stress interactions on the topological features and ultimate strength of large-scale steel structures
Aged marine structural analysis often relies on simplified corrosion modelling. Empirical or statistical methods are used to predict a uniform thickness reduction over time. Although convenient, this approach cannot incorporate the corrosion evolution or the rough surfaces in the damaged area. This is fundamentally due to the lack of representation of the underlying corrosion mechanisms in service environments. To better understand how structural response changes based on corrosion under service loads, this paper presents a series of finite element analyses which consider the coupling relationship between the surface mechanical stresses and the resulting change of corrosion rate. The coupling provide complex corrosion-stress interaction depending on the experimental datasets. The quantification of this interaction is based on in situ experimental measurements of corrosion kinetics at different stress levels. The simulations show the stress effect results in the generation of more realistic corrosion patterns on the structural surface, based on a two-bay/two-span large-scale panel model subject to uniaxial compression. In addition, the incorporation of corrosion experiments allows the modelling of corrosion evolution based on physical observations instead of empirical assumptions. The irregular surface damage leads to a change in structural buckling mode, and up to 8% reduction in ultimate strength compared to models without considering the stress effect.
Finite element method, Grillage, Marine corrosion, Mechano-electrochemistry, Ships and offshore structures, Steel
0263-8231
Ilman, Eko Charnius
b0bf0c91-81e4-4314-9de0-f1efe5a92c9d
Wang, Yikun
2729f2f1-36d7-4daa-8589-b61fcc99a313
Wharton, Julian
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Sobey, Adam
e850606f-aa79-4c99-8682-2cfffda3cd28
Ilman, Eko Charnius
b0bf0c91-81e4-4314-9de0-f1efe5a92c9d
Wang, Yikun
2729f2f1-36d7-4daa-8589-b61fcc99a313
Wharton, Julian
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Sobey, Adam
e850606f-aa79-4c99-8682-2cfffda3cd28

Ilman, Eko Charnius, Wang, Yikun, Wharton, Julian and Sobey, Adam (2020) The impact of corrosion-stress interactions on the topological features and ultimate strength of large-scale steel structures. Thin-Walled Structures, 157, [107104]. (doi:10.1016/j.tws.2020.107104).

Record type: Article

Abstract

Aged marine structural analysis often relies on simplified corrosion modelling. Empirical or statistical methods are used to predict a uniform thickness reduction over time. Although convenient, this approach cannot incorporate the corrosion evolution or the rough surfaces in the damaged area. This is fundamentally due to the lack of representation of the underlying corrosion mechanisms in service environments. To better understand how structural response changes based on corrosion under service loads, this paper presents a series of finite element analyses which consider the coupling relationship between the surface mechanical stresses and the resulting change of corrosion rate. The coupling provide complex corrosion-stress interaction depending on the experimental datasets. The quantification of this interaction is based on in situ experimental measurements of corrosion kinetics at different stress levels. The simulations show the stress effect results in the generation of more realistic corrosion patterns on the structural surface, based on a two-bay/two-span large-scale panel model subject to uniaxial compression. In addition, the incorporation of corrosion experiments allows the modelling of corrosion evolution based on physical observations instead of empirical assumptions. The irregular surface damage leads to a change in structural buckling mode, and up to 8% reduction in ultimate strength compared to models without considering the stress effect.

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More information

Accepted/In Press date: 2 September 2020
e-pub ahead of print date: 19 September 2020
Published date: December 2020
Keywords: Finite element method, Grillage, Marine corrosion, Mechano-electrochemistry, Ships and offshore structures, Steel

Identifiers

Local EPrints ID: 443964
URI: http://eprints.soton.ac.uk/id/eprint/443964
ISSN: 0263-8231
PURE UUID: cef63a89-9b7f-446f-b82b-8eaf94b6ead3
ORCID for Eko Charnius Ilman: ORCID iD orcid.org/0000-0002-9011-7733
ORCID for Yikun Wang: ORCID iD orcid.org/0000-0001-5619-7795
ORCID for Julian Wharton: ORCID iD orcid.org/0000-0002-3439-017X
ORCID for Adam Sobey: ORCID iD orcid.org/0000-0001-6880-8338

Catalogue record

Date deposited: 18 Sep 2020 16:31
Last modified: 18 Feb 2021 17:29

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