Corrosion fatigue crack nucleation from surface irregularity is modelled as a mov-ing boundary value problem. The model is based on material dissolution proportional to the surface stretch. Dissolution and re-passivation processes are forming the ge-ometry of the crack tip, thus creating con-ditions for strain concentration. No crack growth criterion is used. The interaction between the electrochemical processes and the deformation of the crack tip region is incorporated in continuum mechanical theory. Elastic-perfectly plastic materials under low frequency cyclic load are con-sidered. The model simulates how cracks form and grow in a single continuous process. The resulting natural variation of lengths of the formed cracks makes them grow with different rates. One crack after another falls into a wake behind a larger crack and the crack tip load of the smaller decreases leading to its arrest
