Title
A level set model for stress dependent corrosion pit propagation
Author
Dekker, R.
van der Meer, F.P.
Maljaars, J.
Sluys, L.J.
Publication year
2021
Abstract
A numerical model for corrosion pit propagation under mechanical loading is presented. The level set method is used for corrosion front tracking and also enables the domain to be split into a solid and a pit domain. In the pit the diffusion of atoms originating from the dissolution process occurring at the pit front is simulated. The model is capable of automatically capturing lacy cover formation due to the inclusion of activation control, diffusion control and passivation. In the solid static equilibrium is solved to obtain strains and stresses. A parameter, dependent on the signs of the plastic strain increment and the back stress, is introduced to define the influence of plasticity on the corrosion rate. The model is used to study pit growth under electrochemical and mechanical loading. Under activation control combined with an elastic material response, pits propagate faster under constant loading than under cyclic loading. When plastic deformation occurs, cyclic loading can significantly increase the pit growth rate. Increasing the cyclic load frequency results in faster propagation due to kinematic hardening. Under diffusion control, mechanical loading does not influence the pit growth rate, given that the salt layer leading to diffusion control remains intact.
Subject
Pitting corrosion
Corrosion fatigue
Level set method
Multi-physics
Buildings and Infrastructures
2015 Urbanisation
To reference this document use:
http://resolver.tudelft.nl/uuid:516151b0-9829-493f-b03a-1dd8927c914f
TNO identifier
885041
Report number
SR
Source
International Journal for Nnumerical Methods in Engineering, 1-19
Document type
article