Branching of a dissolution driven stress corrosion crack

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Branching of a dissolution driven stress corrosion crack

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Publication Conference Paper, peer reviewed
Title Branching of a dissolution driven stress corrosion crack
Author(s) Bjerkén, Christina
Date 2009
English abstract
Stress corrosion cracking occurs due to the synergistic interaction between mechanical load and corrosion reactions. Some types of stress corrosion crack branch heavily. Here, branching during dissolution driven crack growth is studied using an adaptive FE method. A strain-assisted evolution law is used for the inherently blunted crack. No criterion for crack growth is needed as for a sharp crack, neither for the growth direction. Several simulations are performed with different degrees of load biaxiality. It is found that large biaxiality promotes branching, but no conditions for when branching takes place is found. Instead, branching seems to occur rather randomly due to the perturbation sensitivity of a dissolution driven crack. Also crack growth rates for branched cracks are investigated, and it is found that both constant growth rates can be reached, as well as decreasing rates and eventual arrest. The cracks follow a mode I crack path, however local changes may occur due to the perturbation sensitivity.
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Publisher European Structural Integrity Society
Host/Issue Proceedings of the International Conference on Crack Paths 2009
Language eng (iso)
Subject(s) crack path
stress corrosion
surface evolution
Research Subject Categories::TECHNOLOGY::Engineering mechanics::Solid mechanics
Note International Conference on CRACK PATHS (CP 2009), 23 - 25 September 2009, Vicenza, Italy
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