Simulation of stress-assisted localised corrosion using a cellular automaton finite element approach. (June 2018)

• Record Type: Journal Article
• Authors: Fatoba, O.O.; Leiva-Garcia, R.; Lishchuk, S.V.; Larrosa, N.O.; Akid, R.
• Is Part Of: Corrosion science. Volume 137(2018)
• Page Start: 83
• Page End: 97
• Publication Date: 2018-06
• Subjects: A. Low alloy steel -- B. Potentiostatic polarisation -- B. Cellular automata -- B. Finite Element analysis -- B. Modelling studies -- C. Pitting corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.03.029
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Stress-assisted localised corrosion is simulated using cellular automata finite element approach. Localised corrosion component of the damage is modelled using cellular automata. Stress concentration effect of pit geometry is analysed using finite element method. A feedback loop between both models allows simulation of stress-assisted localised corrosion. Comparison of simulation results with experimental measurements show good agreement. Abstract: In this paper, the overall corrosion damage process is modelled sequentially using cellular automata (CA) to describe the localised corrosion component, and finite element analysis (FEA) to account for the mechanical component resulting from the stress concentration effect of the corrosion defect (pit). Synchronous execution of the CA and FEA, and provision of feedback between both provides a good approximation of stress-assisted pit development. Qualitative and quantitative comparison of simulation results with experimental measurements show good agreement. In particular, the model shows that mechanical effects, notably plastic strain, accelerates the rate of development of localised corrosion.