Evolution of anodic stress corrosion cracking in a coated material

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Evolution of anodic stress corrosion cracking in a coated material

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Publication Article, peer reviewed scientific
Title Evolution of anodic stress corrosion cracking in a coated material
Author(s) Bjerkén, Christina ; Ortiz, Michael
Date 2010
English abstract
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.
DOI http://dx.doi.org/10.1007/s10704-010-9514-5 (link to publisher's fulltext)
Publisher Springer
Host/Issue International Journal of Fracture; 2
Volume 165
ISSN 0376-9429
Pages 211-221
Language eng (iso)
Subject(s) Stress corrosion
Layered material
Moving boundary problem
Surface energy density
Strain energy density
Interface toughness
Technology
Research Subject Categories::TECHNOLOGY::Engineering mechanics::Solid mechanics
Research Subject Categories::TECHNOLOGY::Materials science
Handle http://hdl.handle.net/2043/10371 (link to this page)

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