Computational damage modelling of PEO coated extruded magnesium tested in slow strain rate configuration

3. February 2023

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.

The article aknowledges funding from the European Union's Horizon 2020 research and innovation project OntoTrans and our related project VIPCOAT.

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