A numerical corrosion-fatigue model for biodegradable Mg alloy stents

Predicting localised corrosion and mechanical performance of a PEO surface modified rare earth magnesium alloy for implant use through in-silico modelling

“…This surface-based corrosion model has been shown to be effective in capturing non-uniform and localised aspects of magnesium corrosion, with details reported previously [ 18 , 19 , 35 , 70 ]. While many other surface-based corrosion models have been calibrated to predict specimen strength as a function of mass loss [ 18 , 19 , 51 , 55 , 70 , 71 ], there is no existing model implementation that captures the actual geometric surface features of corrosion. In this respect, the model was calibrated until there was good agreement between the model prediction of average pit depth, pitting factor and maximum detected cross-sectional area loss (see Fig.…”

Development and Future Trends of Protective Strategies for Magnesium Alloy Vascular Stents

“…It was inferred that the loss of structural integrity of the AZ31B stent might be the result of stress concentration, degradation and microstructural changes. Shen et al [ 60 ] published the first paper on a numerical simulation of the corrosion fatigue behavior of magnesium alloy stents subjected to cyclic loading in a physiological environment. A numerical continuum damage mechanics model was developed using the finite element method to explain the corrosion fatigue of magnesium alloys and their application in coronary stents.…”

Mechanical in vitro fatigue testing of implant materials and components using advanced characterization techniques

“…55,56 Few studies exist on the experimental determination of corrosion fatigue properties, whereas recent studies address the simulation of these properties. 57,58 Other studies use a simplified approach and examine wires in strain-or displacement-controlled bending 59 or rotating-bending tests. 60 Analogous to the damage mechanisms described previously, the decrease in fatigue properties was accompanied by the formation of localized corrosion.…”

“…These results are often used to validate finite element simulation 55,56 . Few studies exist on the experimental determination of corrosion fatigue properties, whereas recent studies address the simulation of these properties 57,58 . Other studies use a simplified approach and examine wires in strain‐ or displacement‐controlled bending 59 or rotating‐bending tests 60 .…”