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Evolution of anodic stress corrosion cracking in a coated material
Malmö högskola, School of Technology (TS).ORCID iD: 0000-0002-7952-5330
2010 (English)In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 165, no 2, p. 211-221Article in journal (Refereed)
Abstract [en]

In the present paper, we investigate the influence of corrosion driving forces and interfacial toughness for a coated material subjected to mechanical loading. If the protective coating is cracked, the substrate material may become exposed to a corrosive media. For a stress corrosion sensitive substrate material, this may lead to detrimental crack growth. A crack is assumed to grow by anodic dissolution, inherently leading to a blunt crack tip. The evolution of the crack surface is modelled as a moving boundary problem using an adaptive finite element method. The rate of dissolution along the crack surface in the substrate is assumed to be proportional to the chemical potential, which is function of the local surface energy density and elastic strain energy density. The surface energy tends to flatten the surface, whereas the strain energy due to stress concentration promotes material dissolution. The influence of the interface energy density parameter for the solid-fluid combination, interface corrosion resistance and stiffness ratios between coating and substrate is investigated. Three characteristic crack shapes are obtained; deepening and narrowing single cracks, branched cracks and sharp interface cracks. The crack shapes obtained by our simulations are similar to real sub-coating cracks reported in the literature.

Place, publisher, year, edition, pages
Springer, 2010. Vol. 165, no 2, p. 211-221
Keywords [en]
Stress corrosion, Layered material, Moving boundary problem, Surface energy density, Strain energy density, Interface toughness
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:mau:diva-2619DOI: 10.1007/s10704-010-9514-5ISI: 000281680600008Scopus ID: 2-s2.0-77956393218Local ID: 10371OAI: oai:DiVA.org:mau-2619DiVA, id: diva2:1399382
Available from: 2020-02-27 Created: 2020-02-27 Last updated: 2024-02-05Bibliographically approved

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Bjerkén, Christina

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