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Evolution of anodic stress corrosion cracking in a coated material

Bjerkén, Christina LU and Ortiz, M. (2010) 2nd Broberg Memorial Symposium 2009 In International Journal of Fracture 165(2). p.211-221
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... (More)
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. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Interface toughness, Strain energy density, energy density, Surface, Moving boundary problem, Stress corrosion, Layered material
in
International Journal of Fracture
volume
165
issue
2
pages
211 - 221
publisher
Springer
conference name
2nd Broberg Memorial Symposium 2009
external identifiers
  • wos:000281680600008
  • scopus:77956393218
ISSN
1573-2673
0376-9429
DOI
10.1007/s10704-010-9514-5
language
English
LU publication?
yes
id
04f8089a-f2fe-4152-87bb-ed2b9803601a (old id 1697427)
date added to LUP
2010-10-25 10:19:06
date last changed
2018-05-29 09:32:05
@inproceedings{04f8089a-f2fe-4152-87bb-ed2b9803601a,
  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.},
  author       = {Bjerkén, Christina and Ortiz, M.},
  booktitle    = {International Journal of Fracture},
  issn         = {1573-2673},
  keyword      = {Interface toughness,Strain energy density,energy density,Surface,Moving boundary problem,Stress corrosion,Layered material},
  language     = {eng},
  number       = {2},
  pages        = {211--221},
  publisher    = {Springer},
  title        = {Evolution of anodic stress corrosion cracking in a coated material},
  url          = {http://dx.doi.org/10.1007/s10704-010-9514-5},
  volume       = {165},
  year         = {2010},
}