Crack Growth Modeling and Life Prediction of Pipeline Steels Exposed to Near-Neutral pH Environments: Stage II Crack Growth and Overall Life Prediction

Zhao, Jiaxi; Chen, Weixing; Yu, Min; Chevil, Karina; Eadie, R.L.; Been, Jenny; Boven, Greg Van; Kania, Richard; Keane, Sean

doi:10.1007/s11661-016-3939-z

Cited by 12 publications

(1 citation statement)

References 30 publications

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“…The description of the occluded chemistry effect and micro-cracks sites are essential to provide electrochemical formalities of the mechanisms associated with AD and HE [21,22]. Pending for a suitable integration of the effects produced by the occluded chemistry, cyclic loads, and nucleation of micro-cracks sites the colony evolution remains poorly understood [21][22][23][24][25][26]. Solving this strongly coupled problem is very challenging because it requires predicting the ratedetermining step under multiple physicochemical processes including mass transport of species to and from the crack tip; the oxidation or reduction reactions at the crack tip, and the dynamic strain processes at the crack tip [24,27].…”

Section: Introductionmentioning

confidence: 99%

Phase-field modeling of near-neutral pH stress corrosion crack initiation life in underground pipelines

Martínez

Tesfamariam

2022

Preprint

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A unified phase-field theory is introduced to describe crack initiation and early crack growth due to pitting corrosion of pipelines in contact with near-neutral pH groundwater. The model incorporates a formulation that accounts for stochastic corrosion-induced crack nucleation events at pit sites. This approach supplies a modeling framework to handle the combined effects of electrochemical transformation of the original metal, hydrogen diffusion and resulting embrittlement of the original metal, and mechanical stresses. This is a robust computational approach to tracking the evolving metalelectrolyte interface and embrittlement regions. It was confirmed that dissolved hydrogen into the material promotes crack initiation over a wide potential range and that pitting corrosion, as a precursor of stress corrosion cracking, has a recognizable influence on strength over time. It is expected that this work provides the ground for modeling the pit-to-crack transition required to effectively control very slow crack-in-colonies in pipelines.

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Section: Introductionmentioning

confidence: 99%

Phase-field modeling of near-neutral pH stress corrosion crack initiation life in underground pipelines

Martínez

Tesfamariam

2022

Preprint

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Pipeline Circumferential Cracking in Near-Neutral pH Environment Under the Influence of Residual Stress: Dormancy and Crack Initiation

Shirazi,

Wang,

Eadie

et al. 2024

Metall Mater Trans A

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The purpose of this study is to identify the integrity challenges encountered by buried pipeline steels, specifically to address Circumferential Near-Neutral pH Corrosion Fatigue (C-NNpH-CF). Damage to the pipeline’s protective coating and corrosion conditions increase the risk of service failures caused by C-NNpH-CF. (Note that this mechanism has previously been termed near-neutral pH stress corrosion cracking.) Unlike axial cracking, circumferential cracking is primarily influenced by residual stress from pipeline bending, geohazards, and girth welds. External corrosion pits often lead to dormant cracks, with growth ceasing around 1 mm depth due to reduced dissolution rates. Investigating the impact of bending residual stress (an appropriate source of axial residual stress) and cyclic loading (simulated pipeline pressure fluctuation), the study employs the digital image correlation (DIC) method for stress distribution analysis. Factors like applied loading, initial notch depth, and bending conditions influence crack initiation and recovery from the dormancy stage by affecting stress distribution, stress cells, and stress concentration. Cross-sectional and fractographic images reveal time/stress-dependent mechanisms governing crack initiation, including dissolution rate and hydrogen-enhanced corrosion fatigue. The study emphasizes the role of various residual stress types and their interactions with axial cyclic loading in determining the threshold conditions for crack initiation.

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Pipeline Circumferential Cracking in Near-Neutral pH Environment Under the Influence of Residual Stress: Crack Growth

Shirazi,

Wang,

Eadie

et al. 2024

Metall Mater Trans A

View full text Add to dashboard Cite

Crack Growth Modeling and Life Prediction of Pipeline Steels Exposed to Near-Neutral pH Environments: Stage II Crack Growth and Overall Life Prediction

Cited by 12 publications

References 30 publications

Phase-field modeling of near-neutral pH stress corrosion crack initiation life in underground pipelines

Phase-field modeling of near-neutral pH stress corrosion crack initiation life in underground pipelines

Pipeline Circumferential Cracking in Near-Neutral pH Environment Under the Influence of Residual Stress: Dormancy and Crack Initiation

Pipeline Circumferential Cracking in Near-Neutral pH Environment Under the Influence of Residual Stress: Crack Growth

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