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Influence of localised pit distribution and bench-shape pits on the ultimate compressive strength of steel plating for shipping

Influence of localised pit distribution and bench-shape pits on the ultimate compressive strength of steel plating for shipping
Influence of localised pit distribution and bench-shape pits on the ultimate compressive strength of steel plating for shipping
The worldwide fleet of ships is ageing, with many vessels being over 15 years old. For such vessels, corrosion is an on-going concern. Thus, to guarantee structural integrity, facilitate maintenance decisions economically, and even extend the structural life, it is essential to investigate the ultimate strength of such aged and corroded ship structures based on a comprehensive understanding of the corrosion mechanisms. This work has developed numerical models simulating steel plate corrosion degradation and presents a series of novel finite element (FE) modelling to assess the influence of localised pit distribution and bench-shape pits, which are often observed in long-term exposures. Four location patterns of one-side corroded shipping steel plates have been considered which include both geometric and material non-linearities. Validation of the FE method is achieved by a thermoelastic stress analysis (TSA), which provides the principal stress distribution over the plate surface. The modelling results demonstrate that localised pit distribution can be more detrimental than randomly distributed pits (up to 10.3%). In addition, the bench-shape pits may further decrease the ultimate strength by up to 14% compared to the unbenched condition with the same degree of pitting (DOP).
177-1186
NACE International
Wang, Yikun
2729f2f1-36d7-4daa-8589-b61fcc99a313
Wharton, Julian
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Shenoi, Ajit
a37b4e0a-06f1-425f-966d-71e6fa299960
Wang, Yikun
2729f2f1-36d7-4daa-8589-b61fcc99a313
Wharton, Julian
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Shenoi, Ajit
a37b4e0a-06f1-425f-966d-71e6fa299960

Wang, Yikun, Wharton, Julian and Shenoi, Ajit (2014) Influence of localised pit distribution and bench-shape pits on the ultimate compressive strength of steel plating for shipping. In Corrosion Conference and Expo 2014: Collaborate. Educate. Innovate. Mitigate: Proceedings of a meeting held 9-13 March 2014, San Antonio, Texas, USA. NACE International. pp. 177-1186 .

Record type: Conference or Workshop Item (Paper)

Abstract

The worldwide fleet of ships is ageing, with many vessels being over 15 years old. For such vessels, corrosion is an on-going concern. Thus, to guarantee structural integrity, facilitate maintenance decisions economically, and even extend the structural life, it is essential to investigate the ultimate strength of such aged and corroded ship structures based on a comprehensive understanding of the corrosion mechanisms. This work has developed numerical models simulating steel plate corrosion degradation and presents a series of novel finite element (FE) modelling to assess the influence of localised pit distribution and bench-shape pits, which are often observed in long-term exposures. Four location patterns of one-side corroded shipping steel plates have been considered which include both geometric and material non-linearities. Validation of the FE method is achieved by a thermoelastic stress analysis (TSA), which provides the principal stress distribution over the plate surface. The modelling results demonstrate that localised pit distribution can be more detrimental than randomly distributed pits (up to 10.3%). In addition, the bench-shape pits may further decrease the ultimate strength by up to 14% compared to the unbenched condition with the same degree of pitting (DOP).

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More information

Accepted/In Press date: 2 December 2013
e-pub ahead of print date: 22 April 2014
Published date: December 2014
Venue - Dates: Corrosion Conference and Expo 2014: Collaborate. Educate. Innovate. Mitigate, , Houston, United States, 2014-03-09 - 2014-03-13
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 402088
URI: http://eprints.soton.ac.uk/id/eprint/402088
PURE UUID: 2134894b-06b2-4926-a47e-5155c4568a50
ORCID for Yikun Wang: ORCID iD orcid.org/0000-0001-5619-7795
ORCID for Julian Wharton: ORCID iD orcid.org/0000-0002-3439-017X

Catalogue record

Date deposited: 31 Oct 2016 10:20
Last modified: 09 Jan 2022 03:44

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Contributors

Author: Yikun Wang ORCID iD
Author: Julian Wharton ORCID iD
Author: Ajit Shenoi

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