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  4. Ultra-low cycle fatigue of ship hull structure: an alternately-cyclically loaded four-point bending test of a large box girder
 
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Ultra-low cycle fatigue of ship hull structure: an alternately-cyclically loaded four-point bending test of a large box girder

Citation Link: https://doi.org/10.15480/882.13883
Publikationstyp
Journal Article
Date Issued
2025-03-15
Sprache
English
Author(s)
Song, Shi 
Konstruktion und Festigkeit von Schiffen M-10  
Ehlers, Sören  
Konstruktion und Festigkeit von Schiffen M-10  
von Bock und Polach, Rüdiger Ulrich Franz  orcid-logo
Konstruktion und Festigkeit von Schiffen M-10  
Braun, Moritz  orcid-logo
Konstruktion und Festigkeit von Schiffen M-10  
TORE-DOI
10.15480/882.13883
TORE-URI
https://hdl.handle.net/11420/52404
Journal
Marine structures  
Volume
100
Article Number
103732
Citation
Marine Structures 100: 103732 (2025)
Publisher DOI
10.1016/j.marstruc.2024.103732
Scopus ID
2-s2.0-85210544300
Publisher
Elsevier
Ultra-low cycle fatigue (ULCF) refers to material failure at small number of loading cycles. For large complex structures like ships, the damage from ULCF can bring hazardous consequences. In this study, an alternately-cyclically loaded four-point bending test of a large box girder is introduced as the specimen to represent the ULCF of ship hull structure. In every load during the test, large deformation is applied to the specimen even after reaching its ultimate hull girder strength (UHGS), thus extensive plastic deformation and obvious fracture can occur in the specimen. The severely damaged specimen is further tested until 1.5 cycles of bending are finished, thus the test of post-damage box girder is realized. Moreover, the box girder is divided into 3 sub-sections, which show different but still interacting structural behavior. The result of the test shows the structural behavior of a large complex structure suffering severe damage during alternate hogging and sagging after reaching its UHGS, which corresponds to the consequence of ULCF. The presented ULCF test also provides experiences for investigations of large complex structures with existing damages or after accidental loads. Considering the number of cycles in the test, this study can bridge the gap between monotonic overload and ultra-low cycle fatigue.
Subjects
4-point bending | Large complex structure | Large scale test | Ship structure | Steel structure | Ultra-low cycle fatigue
DDC Class
620.1: Engineering Mechanics and Materials Science
624.1: Structural Engineering
Funding(s)
Projekt DEAL  
Lizenz
https://creativecommons.org/licenses/by/4.0/
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