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Fatigue Crack Growth in Stiffened Steel Tubular Joints in Sea Water Environment

IR@SERC: CSIR-Structural Engineering Research Centre, Chennai

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Title Fatigue Crack Growth in Stiffened Steel Tubular Joints in Sea Water Environment
 
Creator Gandhi, P.
Ramachandra Murthy, D.S.
Raghava, G.
Madhava Rao, A.G.
 
Subject Offshore structures
Stiffened tubular joints
Corrosion fatigue
Fatigue crack growth
Fracture mechanics
 
Description Welded steel tubular structures commonly used for offshore platforms are susceptible to fatigue failure due to stress concentration at welded joints and environmental loading which is cyclic in nature. Offshore structures contain flaws ranging from microscopic material defects to macroscopic geometric imperfections, due to fabrication and construction process. Such flaws can develop into cracks due to influence of cyclic wave loading in an aggressive marine environment. Due to this and many other causes, maintaining structural integrity of these structures has been a major concern for the oil industry. Hence a model for crack initiation life and crack growth life estimation has been developed by conducting constant amplitude corrosion fatigue tests on internally ring-stiffened steel tubular T and Y joints under freely corroding conditions. Biologically inert synthetic seawater was used as the corrosive environment. Tests in seawater were carried out with a loading frequency of 0.2 Hz. The studies were made with respect to tropical environment similar to Indian offshore. The corrosion fatigue crack growth data obtained during the tests and the Fracture Mechanics (FM) model developed are discussed in this paper.
 
Date 2009
2009
2000
 
Type Article
 
Identifier Engineering Structures, Vol.22, 2000, pp.1390–1401
http://hdl.handle.net/123456789/80
 
Language en
 
Rights It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Elsevier