The article from our colleagues at Helmholtz-Zentrum Hereon (Germany) deals with the problem of mechanical damage induced failure within protective coatings as one of the main reasons for loss of coating integrity. Our colleagues therefore developed a model which allows correlating and studying the effect of brittle porus coatings on the stress-strain curve evolution of plasma electrolytic oxidation (PEO) coated extruded Mg substrates.
In this article...
• a new macroscopic FEM model describes damage effect of PEO coating on cpMg.
• PEO layer porosity, thickness and steady state crack spacing are correlated to specimen's stress-strain response.
• local stress distribution is simulated in PEO fragments at steady state crack spacing.