Experimental analysis of S–N curves of welded joints with different fatigue life extension approaches

Lei Tian; Chao Feng; Molin Su; Lianyong Xu; Yongdian Han; Lei Zhao

doi:10.1515/mt-2023-0220

Article

Experimental analysis of S–N curves of welded joints with different fatigue life extension approaches

Lei Tian
Lei Tian is a male PhD student at Tianjin University. He is primarily engaged in the study of fatigue fracture failure analysis of marine engineering structures, welding process methods, and the mechanical behavior characteristics of marine engineering structures.
, Chao Feng
Chao Feng, a male PhD student at Tianjin University born in 1995, dedicates his research to fatigue design and fatigue life evaluation of welded structures, along with the analysis and prediction of fatigue behavior based on data-driven methods.
, Molin Su
Molin Su, born in 1994, is a male PhD student at Tianjin University. His research interests include fatigue crack propagation behavior and crack propagation rate, microscopic characterization of fatigue characteristics, and laser welding.
, Lianyong Xu
Lianyong Xu, born in 1975, is a professor and PhD holder from Tianjin University. He is actively engaged in fracture assessment and fatigue life assessment of engineering structures under extremely complex environmental conditions, and in the high-performance long-life welding and manufacturing of engineering structures.
, Yongdian Han
Yongdian Han, a male professor and PhD holder from Tianjin University born in 1983, focuses on the design, development, and reliability of micro connecting materials, additive manufacturing technology, and reliability evaluation of engineering structural components.
and Lei Zhao
Lei Zhao, born in 1985, is an associate professor and PhD holder at Tianjin University. His research primarily deals with stress and deformation control of welded structures, and structural integrity and life assessment in extreme environments.

Published/Copyright: April 26, 2024

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From the journal Materials Testing Volume 66 Issue 7

Abstract

The fatigue life extension approaches played an important role in ensuring the safety of marine engineering structures. This study conducted an in-depth analysis of the S–N curves of welded structures under different service environments and different fatigue life extension approaches, and found that the comprehensive life extension process of welding toe polishing and coating (the fatigue life was extended by 15–33 times compared to untreated samples) was the most significant approach under dry air medium environment. The comprehensive life extension process of welding toe polishing and coating (the fatigue life was extended by 10–25 times compared to untreated samples) was the most significant approach under salt spray corrosive medium environment. Moreover, the S–N curve and related parameters of welded joints of semi-submersible platform under different environmental media conditions and different combinations of fatigue life extension approaches were studied in depth, which had important guiding significance for practical life extension tools of jacket platform T-joints in practice.

Keywords: welded joints; fatigue testing; fatigue life extension; corrosion fatigue; corrosion protection

Corresponding author: Chao Feng, Tianjin University, Tianjin, 300072, China, E-mail: chaof7077@tju.edu.cn

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 51975405, 52075374

Funding source: National Science Fund for Distinguished Young Scholars

Award Identifier / Grant number: 52025052

About the authors

Lei Tian

Lei Tian is a male PhD student at Tianjin University. He is primarily engaged in the study of fatigue fracture failure analysis of marine engineering structures, welding process methods, and the mechanical behavior characteristics of marine engineering structures.

Chao Feng

Chao Feng, a male PhD student at Tianjin University born in 1995, dedicates his research to fatigue design and fatigue life evaluation of welded structures, along with the analysis and prediction of fatigue behavior based on data-driven methods.

Molin Su

Molin Su, born in 1994, is a male PhD student at Tianjin University. His research interests include fatigue crack propagation behavior and crack propagation rate, microscopic characterization of fatigue characteristics, and laser welding.

Lianyong Xu

Lianyong Xu, born in 1975, is a professor and PhD holder from Tianjin University. He is actively engaged in fracture assessment and fatigue life assessment of engineering structures under extremely complex environmental conditions, and in the high-performance long-life welding and manufacturing of engineering structures.

Yongdian Han

Yongdian Han, a male professor and PhD holder from Tianjin University born in 1983, focuses on the design, development, and reliability of micro connecting materials, additive manufacturing technology, and reliability evaluation of engineering structural components.

Lei Zhao

Lei Zhao, born in 1985, is an associate professor and PhD holder at Tianjin University. His research primarily deals with stress and deformation control of welded structures, and structural integrity and life assessment in extreme environments.

Research ethics: Not applicable.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Competing interests: The authors declare no conflicts of interest regarding this article.
R esearch funding: This work was financially supported by The National Science Fund for Distinguished Young Scholars [grant number 52025052] and The National Natural Science Foundation of China [grant numbers 51975405, 52075374].
Data availability: Not applicable.

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Published Online: 2024-04-26

Published in Print: 2024-07-26

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Articles in the same Issue

https://doi.org/10.1515/mt-2023-0220

Keywords for this article

welded joints; fatigue testing; fatigue life extension; corrosion fatigue; corrosion protection