Simulation of stress-assisted localised corrosion using a cellular automaton finite element approach

Fatoba, Olusegun; Leiva-García, R.; Lishchuk, Sergey V.; Larrosa, Nicolas; Akid, Robert

doi:10.1016/j.corsci.2018.03.029

Cited by 72 publications

(29 citation statements)

References 78 publications

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“…Alternatively, there are some other numerical techniques in which FEM is coupled with another numerical method in order to account for the interaction between pit morphology and pertinent physical fields during the localized corrosion propagation, such as the FEM-phase field model [127][128] to account for the effect of physics (microstructure and grain orientation), solution chemistry and electrochemistry (electrode kinetics, electrolyte potential, and current density) on the localized corrosion propagation, and cellular automata FEM modeling [129][130] to simulate stress-assisted pit development. These combined approaches together with the FEM based moving boundary methods discussed previously help provide a quantitively way to better describe and investigate the localized corrosion propagation as a function of pertinent physical, chemical, and electrochemical parameters.…”

Section: Advanced Numerical Techniques To Simulate Localized Corrosmentioning

confidence: 99%

A Review of the Application of Finite Element Method (FEM) to Localized Corrosion Modeling

Kelly

2019

CORROSION

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The modeling of localized corrosion has usually focused on calculating the spatial and/or temporal distributions of chemical species, potential, and current. These are affected by the reactions considered, the geometry, and the modes of mass transport of importance. Finite element method (FEM) is a numerical technique to obtain approximate solutions to the differential equations based on different types of discretization in which the domain of interest is divided into different types of elements. The introduction of the FEM opened a variety of opportunities for increasing the complexity, and therefore the fidelity, of the localized corrosion conditions considered. This article first briefly introduces the FEM technique before describing the choices the modeler has with regards to the governing equations for the system. The history of the application of FEM to localized corrosion is given, highlighting the different aspects of localized corrosion that have been successfully modeled. Finally, some of the current challenges in FEM modeling of localized corrosion are outlined.

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Section: Advanced Numerical Techniques To Simulate Localized Corrosmentioning

confidence: 99%

A Review of the Application of Finite Element Method (FEM) to Localized Corrosion Modeling

Kelly

2019

CORROSION

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“…A value for ε th was required for use as part of a multi-stage Cellular Automata Finite Element (CAFE) model for corrosion fatigue. [19] ε th was defined as the maximum value of strain in the area of crack initiation for the image captured prior to a crack being visible in the raw images. Once the strain data was extracted, the evolution of localised surface strain was plotted against the applied number of fatigue cycles.…”

Section: Effect Of Pit Geometry On Threshold Strain For Crack Initiationmentioning

confidence: 99%

Strain evolution around corrosion pits under fatigue loading

Evans

Leiva-García

Akid

2018

Theoretical and Applied Fracture Mechanics

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The effect of pit depth on the crack initiation life of the API-5L X65 steel was investigated by varying the depth of corrosion pits generated on fatigue specimens using a micro-electrochemical cell. Fatigue specimens were subjected to fatigue loading in air, during which time images of the surface around the pits were captured in-situ. Digital image correlation was employed to make full-field strain measurements at the mouth of corrosion pits from the images captured during testing. From these measurements, an average threshold strain value for crack initiation of 0.24±0.06 % was established. Whilst crack initiation life was observed to decrease with increasing pit depth, the threshold value was observed to be unaffected by pit depth. Images captured during the fatigue cycling were also used to calculate crack growth data. Crack growth rate was found to be influenced by pit depth for the first 150 μm of crack length, where greater pit depth facilitated higher crack growth rates due to an increased strain concentration around the deeper pits.

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“…The CAFE model for the development of stress-assisted pitting in a pipeline steel exposed to a chloride environment has been described in [77]. A typical CA mesh and CAFE output contour plot are shown in Figure 22b below.…”

Section: Application Of a Cellular Automaton And Finite Element (Cafementioning

confidence: 99%

‘Mind the gap’ in fitness-for-service assessment procedures-review and summary of a recent workshop

Larrosa

Ainsworth

Akid

et al. 2017

International Journal of Pressure Vessels and Piping

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'Mind the gap' in Fitness-for-Service (FFS) assessment procedures was a workshop held at The University of Manchester in June 2015. The goal of the workshop was firstly to identify 'knowledge gaps' or areas for improvement in FFS assessment procedures and, secondly, to present methodologies that have been developed to narrow these gaps. It was intended that identification of these 'gaps' would allow an understanding of the current development needs for defect tolerance arguments in the FFS assessment procedures. The following questions were addressed: 1) What are the main 'knowledge gaps' in current FFS assessment procedures and methodologies? 2) What are the main barriers that need to be overcome in order to narrow these 'gaps'? 3) What are the current procedures (if any) and why are these not useful, over-or under-conservative and what needs to be improved? 4) What research is currently ongoing in order to narrow the gaps? This paper summarises the presentations and discussions at the workshop on subjects such as environmentally assisted cracking mechanisms, creep, welding residual stresses and fracture mechanics.

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Simulation of stress-assisted localised corrosion using a cellular automaton finite element approach

Cited by 72 publications

References 78 publications

A Review of the Application of Finite Element Method (FEM) to Localized Corrosion Modeling

A Review of the Application of Finite Element Method (FEM) to Localized Corrosion Modeling

Strain evolution around corrosion pits under fatigue loading

‘Mind the gap’ in fitness-for-service assessment procedures-review and summary of a recent workshop

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