J. Phys. IV France
Volume 09, Numéro PR9, September 19993rd European Mechanics of Materials Conference on Mechanics and Multi-Physics Processes in Solids : Experiments, Modelling, Applications
|Page(s)||Pr9-251 - Pr9-260|
J. Phys. IV France 09 (1999) Pr9-251-Pr9-260
Microfracture by pile-up formation at a stress corrosion crack tip : Numerical simulations of hydrogen/dislocation interactionsD. Delafosse, J.P. Chateau and T. Magnin
École des Mines, Centre SMS, URA 1884 du CNRS, 158 cours Fauriel, 42023 Saint-Étienne, France
This paper presents a simulation method that is aimed at investigating the elementary mechanisms governing the process of Stress Corrosion Cracking under cathodic hydrogen discharge. Key issues concerning the experimental evidences of localised corrosion - deformation interactions and the relevant modelling are briefly recalled. The simulation method is introduced and the first results on elementary configurations outline the basic mechanisms of hydrogen - plasticity interactions at a Stress Corrosion crack tip. The effect of hydrogen on the density of a dislocation pile-up is examined. The particular situation at the tip of a loaded crack is examined via the introduction of image forces on diffusing interstitial hydrogen. Conclusions are drawn concerning the basic ingredients of the model, as well as future developments of the simulation technique.
© EDP Sciences 1999