A Moving Boundary Model For Fatigue Corrosion Cracking
Author(s)
A. P. Jivkov
Abstract
A moving boundary model for fatigue
corrosion cracking
A. P. Jivkov
Solid Mechanics, Malmo University, Sweden
Abstract
Fatigue corrosion crack initiation and propagation is modelled as a moving
boundary value problem. The model is based on three physical processes
operating at the solid-environment interface - material dissolution, passive film
formation and surface straining. The dissolution triggers boundary advancement.
The rate of boundary advancement depends on the passive film damage caused
by the surface straining. Plane edge cracks, nucleating from surface
irregularities, are considered. The cracks obtain realistic geometrical shapes
where the near-tip region is an integral part of the crack surface. Elastic-perfectly
plastic materials are considered and a low-cycle fatigue load is assumed. The
problem is solved using a FEM based program and procedures for moving
boundary tracking and interior re-meshing. A crucial ingredient of the boundary
tracking is the evolved surface re-meshing,
Keywords
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