The Stress Concentration Factor of Different Corrosion Pits Shape

Mu, Zhi Tao; Chen, Ding Hai; Zhu, Zuo Tao; Ye, Bin

doi:10.4028/www.scientific.net/amr.152-153.1115

Cited by 13 publications

(8 citation statements)

References 3 publications

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“…Many researchers have utilized FEA to study the pit‐to‐crack transition in different alloys, but to date, all studies have been limited to static loading only. In the present study, to consider the effect of cyclic loading and local plastic deformation, 3D elastic‐plastic FEA has been carried out using ABAQUS software.…”

Section: Methodsmentioning

confidence: 99%

“…The pit geometries used for FEA modeling here are similar in terms of aspect ratio to those generated during experiments. Previous studies have used FEA to study the pit‐to‐crack transition under static loading using the elastic and elastic‐plastic material models . Other than a study by some of the authors of the present work, we are not aware of any other published data on FEA of corrosion pits under cyclic loading in air or in saline environment.…”

Section: Introductionmentioning

confidence: 96%

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Behavior of 316L stainless steel containing corrosion pits under cyclic loading

Hashim

Farhad

Smyth-Boyle

et al. 2019

Materials & Corrosion

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The environmental performance of 316L grade stainless steel, in the form of tensile specimens containing a single corrosion pit with various aspect ratios, under cyclic loading in aerated chloride solutions is investigated in this study. Results from environmental tests were compared and contrasted with those obtained using finite element analysis (FEA). Fractography of the failed specimens obtained from experiments revealed that fatigue crack initiation took place at the base of the shallow pit. The crack initiation shifted towards the shoulder and the mouth of the pit for pits of increasing depth. This process is well predicted by FEA, as the strain contour maps show that strain is the highest around the centric strip of the pit. However, for shallow pits, local strain is uniformly distributed around that strip but begins to concentrate more towards the shoulder and the mouth region for increasingly deep pits.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Behavior of 316L stainless steel containing corrosion pits under cyclic loading

Hashim

Farhad

Smyth-Boyle

et al. 2019

Materials & Corrosion

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“…1 Pit-to-crack transitions under static loading have been investigated numerically and experimentally in previous studies. 4,[16][17][18][19][20][21][22][23][24] However, in spite of the importance of cyclic loading in reducing the life of components, the variation of local stress around corrosion pits under fatigue loading and its influence on fatigue life prediction have not been established. This issue constitutes a significant knowledge gap in the understanding of the pit-to-fatigue crack transition process.…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of corrosion pits in X65 steel pipelines

Farhad

Zhang

Smyth-Boyle

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Corrosion pits are a form of geometrical discontinuity that lead to stress and strain concentration in engineering components, resulting in crack initiation under service loading conditions and ultimately fracture and failure. Initiation and propagation of cracks in offshore pipelines can lead to loss of containment and environmental and commercial impacts. In order to prevent such failures, tools to predict the structural integrity of pipelines need to be improved. This work investigates the fatigue behaviour of corrosion pits in API-5L X65 grade steel pipeline utilising numerical and analytical methods. Firstly, load-controlled fatigue tests were carried out on smooth X65 steel samples to establish S–N data. Secondly, local stress–strain behaviour at corrosion pits and its effect on fatigue crack initiation were investigated using elastic-plastic finite element analysis of samples containing a single corrosion pit under cyclic loading. Analysis of stabilised stress–strain hysteresis loops at corrosion pits showed that the local stress ratio at the pit changes from 0.1 to −0.4 while the applied stress amplitude increases with the same stress ratio of 0.1. Analytical methods were also used to predict the local maximum stress and strain at the pit, which showed a similar local stress ratio to the finite element analysis result but lower stress and strain ranges. Finally, fatigue crack initiation life was predicted using the combination of finite element stress and strain analysis and the Smith–Watson–Topper strain–life approach. An advantage of this method for life estimation is that this approach considers the local stress and strains at corrosion pits rather than applied stress.

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“…As some authors [24,25] confirmed recently, the stress concentration of pits increased with the pit aspect ratio (depth-diameter ratio). Consequently, significant stress concentration would form in the needle-like pit under tensile stress.…”

Section: Discussionmentioning

confidence: 60%

Tensile strength and oxide analysis of carbon steel in concrete exposed in atmospheric environment for 53 years

Feng

Zuo

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The tensile strength of a corroded rebar in a 53-year-old concrete structure was studied. The microstructure of the metallic substrate, the fracture surface, and the corrosion product layers were investigated. Metallographic observation results showed that the carbon steel was constituted of ferrite and some pearlite. The tensile test results indicated that the corroded rebar presented low strength and elongation. In addition, the fracture surface of the rebar in the tensile test displayed dimple fracture behavior. The Raman spectroscopy results indicated that corrosion products at the general corrosion zone were obviously different from those at the localized corrosion zone. The rust layer at the general corrosion zone was composed of goethite (α-FeOOH), magnetite (Fe 3 O 4 ), and hematite (α-Fe 2 O 3 ), while that of the pitting zone was made of feroxyhyte (δ-FeOOH), goethite (α-FeOOH), and hematite (α-Fe 2 O 3 ). However, the general tendencies that the corrosion products were constituted of a mix of oxides and hydroxides, the oxides mainly existed in the internal part and the hydroxides more presented in the external layer were observed.

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The Stress Concentration Factor of Different Corrosion Pits Shape

Cited by 13 publications

References 3 publications

Behavior of 316L stainless steel containing corrosion pits under cyclic loading

Behavior of 316L stainless steel containing corrosion pits under cyclic loading

Fatigue behaviour of corrosion pits in X65 steel pipelines

Tensile strength and oxide analysis of carbon steel in concrete exposed in atmospheric environment for 53 years

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