A two-dimensional mesoscale model for intergranular stress corrosion crack propagation

A mechanical model for simulating intergranular stress corrosion cracking is presented. The model has been developed to address the limitations of percolation-like models, which do not account for the mechanical crack driving force and cannot capture experimentally observed phenomena such as the for...

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Bibliographic Details
Published in:Acta materialia 2006-08, Vol.54 (13), p.3493-3501
Main Authors: Jivkov, A.P., Stevens, N.P.C., Marrow, T.J.
Format: Article
Language:English
Subjects:
Applied sciences
Boundaries
Computer simulation
Corrosion
Corrosion environments
Crack propagation
Exact sciences and technology
Failure
Finite element analysis
Fracture
Fracture mechanics
Fractures
Grain boundaries
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Stainless steels
Strength
Stress corrosion cracking
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Summary:A mechanical model for simulating intergranular stress corrosion cracking is presented. The model has been developed to address the limitations of percolation-like models, which do not account for the mechanical crack driving force and cannot capture experimentally observed phenomena such as the formation of ductile bridging ligaments by resistant boundaries. The model is based on a regular representation of material microstructure and a categorisation of grain boundaries as susceptible and resistant to corrosion. Crack propagation in two-dimensional microstructures with several fractions of experimentally observed susceptible boundaries is studied. Monte Carlo-type simulations with random distributions of boundaries and a range of susceptible and resistant boundary failure strengths are performed. The effects of crack bridging and crack branching are quantified. It is concluded that together with the fraction of susceptible boundaries, the resistant boundary failure strength is the significant parameter controlling the shielding effect of bridges on crack propagation.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2006.03.030