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NEW FINDINGS ON THE IMPACT OF THE IDEALIZATION OF CORROSION ON THE BRITTLE FAILURE OF STEEL

Biglu, Michael and von Bock und Polach, Franz and Ehlers, Sören (2022) NEW FINDINGS ON THE IMPACT OF THE IDEALIZATION OF CORROSION ON THE BRITTLE FAILURE OF STEEL. In: ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022, 2, V002T02A040. OMAE2022, 2022-06-05 - 2022-06-10, Hamburg. doi: 10.1115/OMAE2022-82014. ISBN 978-079188595-6.

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Official URL: https://doi.org/10.1115/OMAE2022-82014

Abstract

Corrosion is mostly considered as homogeneous thickness reduction in construction guidelines of the maritime industry. Several studies concluded that besides a homogeneous thickness reduction the corroded non-uniform surface morphology is affecting the strength and strain behavior of steel. However, the effects of non-uniform corrosion on the behavior of steel is still not clearly assessed. The effects of corrosion on the local behavior of steel structures under tensile loading were investigated by conducting tensile tests on naturally corroded steel specimens and analyzing the surface morphology based on surface scans. Influences of geometrical parameters on the strength and strains were determined by carrying out a correlation analysis combined with a Particle Swarm Optimization. Then a non-linear finite element analysis was performed to compare a homogeneous idealization with finite element models considering the naturally corroded surface morphology. Both independent approaches conclude that non-uniform corrosion leads to a more brittle stress-strain behavior of steel compared to a homogeneous corrosion approach, including higher stresses and decreased total breaking strain. In addition we can confirm that pittings and surface roughness are leading to a decrease of the total breaking strain. In contrast to many other studies we highlighted that instead of the pitting corrosion in general, the volume or thickness loss are the primary driver for the ultimate tensile strength reduction

Item URL in elib:https://elib.dlr.de/187369/
Document Type:Conference or Workshop Item (Speech)
Title:NEW FINDINGS ON THE IMPACT OF THE IDEALIZATION OF CORROSION ON THE BRITTLE FAILURE OF STEEL
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Biglu, MichaelHamburg University of Technology, Hamburg, GermanyUNSPECIFIEDUNSPECIFIED
von Bock und Polach, FranzHamburg University of Technology, Hamburg, GermanyUNSPECIFIEDUNSPECIFIED
Ehlers, SörenUNSPECIFIEDhttps://orcid.org/0000-0001-5698-9354UNSPECIFIED
Date:5 June 2022
Journal or Publication Title:ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:2
DOI:10.1115/OMAE2022-82014
Page Range:V002T02A040
ISBN:978-079188595-6
Status:Published
Keywords:Corrosion, Finite Element Analysis, numerical simulation, Strength Analysis, Integrity of steel structures
Event Title:OMAE2022
Event Location:Hamburg
Event Type:international Conference
Event Start Date:5 June 2022
Event End Date:10 June 2022
Organizer:American Society of Mechanical Engineers (ASME)
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 09:18
Last Modified:24 Apr 2024 20:48

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