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Selfsimilar solutions for stress driven material dissolution : Advanced Fracture Mechanics for Life and Safety Assessments

Ståhle, P. LU and Jivkov, A. P. LU (2004)
Abstract
During corrosive dissolution of metal ions from a body surface, an oxide compound is
produced. This compound forms a protective film that reduces the dissolution rate. When a
fraction of a millimetre depth is dissolved the dissolution rate become insignificant. However,
repeated loading will damage the film with continued dissolution as a result. In connection
with this a threshold strain is assumed to exist. This paper proposes a model where electrochemical processes and the mechanical load work together in forming a corrosion pit. The
ratio between the threshold strain and the remotely applied strain is shown to control the
shape of the pit. For small applied strains cracks are formed. A crack evolving from a... (More)
During corrosive dissolution of metal ions from a body surface, an oxide compound is
produced. This compound forms a protective film that reduces the dissolution rate. When a
fraction of a millimetre depth is dissolved the dissolution rate become insignificant. However,
repeated loading will damage the film with continued dissolution as a result. In connection
with this a threshold strain is assumed to exist. This paper proposes a model where electrochemical processes and the mechanical load work together in forming a corrosion pit. The
ratio between the threshold strain and the remotely applied strain is shown to control the
shape of the pit. For small applied strains cracks are formed. A crack evolving from a surface
irregularity is studied. The growth rate of the crack is determined by the dissolution rate at
the crack tip. No crack growth criterion is needed. The growing crack is itself creating
conditions for strain concentration, which leads to a high crack growth rate. The model
simulates how dissolution forms a pit that grows to become a crack in a single continuous
process. For small loads the crack growth rate is independent of applied load. (Less)
Abstract (Swedish)
During corrosive dissolution of metal ions from a body surface, an oxide compound isproduced. This compound forms a protective film that reduces the dissolution rate. When afraction of a millimetre depth is dissolved the dissolution rate become insignificant. However,repeated loading will damage the film with continued dissolution as a result. In connectionwith this a threshold strain is assumed to exist. This paper proposes a model where electro-chemical processes and the mechanical load work together in forming a corrosion pit. Theratio between the threshold strain and the remotely applied strain is shown to control theshape of the pit. For small applied strains cracks are formed. A crack evolving from a surfaceirregularity is studied.... (More)
During corrosive dissolution of metal ions from a body surface, an oxide compound isproduced. This compound forms a protective film that reduces the dissolution rate. When afraction of a millimetre depth is dissolved the dissolution rate become insignificant. However,repeated loading will damage the film with continued dissolution as a result. In connectionwith this a threshold strain is assumed to exist. This paper proposes a model where electro-chemical processes and the mechanical load work together in forming a corrosion pit. Theratio between the threshold strain and the remotely applied strain is shown to control theshape of the pit. For small applied strains cracks are formed. A crack evolving from a surfaceirregularity is studied. The growth rate of the crack is determined by the dissolution rate atthe crack tip. No crack growth criterion is needed. The growing crack is itself creatingconditions for strain concentration, which leads to a high crack growth rate. The modelsimulates how dissolution forms a pit that grows to become a crack in a single continuous process. For small loads the crack growth rate is independent of applied load. (Less)
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Contribution to conference
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published
subject
keywords
corrosion, dissolution, crack growth
language
English
LU publication?
no
id
22146d88-abb3-4a96-a374-03de8a5c4a27
date added to LUP
2019-06-25 14:17:15
date last changed
2020-01-29 13:53:58
@misc{22146d88-abb3-4a96-a374-03de8a5c4a27,
  abstract     = {{During corrosive dissolution of metal ions from a body surface, an oxide compound is<br/>produced. This compound forms a protective film that reduces the dissolution rate. When a<br/>fraction of a millimetre depth is dissolved the dissolution rate become insignificant. However,<br/>repeated loading will damage the film with continued dissolution as a result. In connection<br/>with this a threshold strain is assumed to exist. This paper proposes a model where electrochemical processes and the mechanical load work together in forming a corrosion pit. The<br/>ratio between the threshold strain and the remotely applied strain is shown to control the<br/>shape of the pit. For small applied strains cracks are formed. A crack evolving from a surface<br/>irregularity is studied. The growth rate of the crack is determined by the dissolution rate at<br/>the crack tip. No crack growth criterion is needed. The growing crack is itself creating<br/>conditions for strain concentration, which leads to a high crack growth rate. The model<br/>simulates how dissolution forms a pit that grows to become a crack in a single continuous<br/>process. For small loads the crack growth rate is independent of applied load.}},
  author       = {{Ståhle, P. and Jivkov, A. P.}},
  keywords     = {{corrosion; dissolution; crack growth}},
  language     = {{eng}},
  title        = {{Selfsimilar solutions for stress driven material dissolution : Advanced Fracture Mechanics for Life and Safety Assessments}},
  year         = {{2004}},
}