Evolution of fatigue crack corrosion from surface irregularities

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Evolution of fatigue crack corrosion from surface irregularities

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Publication Article, peer reviewed scientific
Title Evolution of fatigue crack corrosion from surface irregularities
Author(s) Jivkov, Andrey
Date 2003
English abstract
A moving boundary model is presented for crack nucleation and growth from surface flaws. It concerns with chemical attack that results in material dissolution. A controlling mechanism for evolution is the rupture of a brittle corrosion-protective film that is built up along the corroding surface. The evolution rate is a function of the degree of protective film damage caused by the surface straining. The problem is formulated for an elastic body containing a single and double pits. Low-frequency cyclic loading is considered. Numerical solution is proposed. The behaviours of a growing crack and of two competing cracks are described. Stages of incubation, blunting and steady-state growth characterise a single crack evolution. The steady-state growth rate is found independent of the initial geometry. Stages of independent growth, interactive growth and arrest of one crack characterise the evolution of two competing cracks. The lengths of the arrested cracks are presented as functions of the ratio between the pit depth for a series of different distances between the pits. It is emphasized that the solutions correspond to a homogeneous material. Further work is required to account for the material microstructure.
DOI http://dx.doi.org/10.1016/S0167-8442(03)00033-8 (link to publisher's fulltext)
Host/Issue Theoretical and Applied Fracture Mechanics;1
Volume 40
ISSN 0167-8442
Pages 45-54
Language swe (iso)
Subject(s) Technology
Research Subject Categories::TECHNOLOGY
Handle http://hdl.handle.net/2043/4788 (link to this page)

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