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During the last decade, an increasing importance has been given to thefeedback of mechanical stresses on the chemical diffusion and, further, oncorrosion. Many works point the active role of stresses on the material ageingespecially on their negative consequences leading to the damaging ofstructures. Based on a theoretical study and using numerical tools andexperimental results our previous works [1, on stress/diffusion coupling,highlight the strong influence of stress field on the diffusion process. Theaim of the present paper is to describe the influence of some particularmorphologies of the metal/oxide interface on both diffusion and oxidationprocess. The oxidation is assumed to be driven by a mass conservation law(Stefan's law) while the diffusion coefficient of oxygen in metal is locallyinfluenced by the stress field. The stability of a waved-shape interface isstudied in both cases: simple diffusion and coupled stress/diffusion process.In this purpose we have developed an original numerical model using a virtualmetal/oxide interface of a mono-material with oxygen concentration-dependentparameters, which allows to operate easily with any shape of interface and touse simple finite element meshes. Furthermore, in order to underline in a moreobvious way the consequences of mechanical stress on the diffusion process, aparticular geometry is studied.

Simulation of Metal/Oxide Interface Mobility: Effects of Mechanical Stresses on Geometrical Singularities