Modelling corrosion/Degradation in Biodegradable Mg Scaffold in SB Fluid using Abaqus and Python

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Magnesium (Mg) scaffolds are biodegradable structures used in bone repair and regeneration. They mimic bone's mechanical properties, gradually dissolve in the body, and promote bone growth through their porous design and the release of biologically beneficial magnesium ions.
A finite element-based simulation approach was used to model the corrosion and mechanical characteristics of biodegradable magnesium (Mg) scaffolds featuring diverse shapes such as Gyroid, TPMS, and BCC lattice structures. Corrosion behavior was simulated using a diffusion-driven model based on Fick's law, capturing fluid diffusion within the scaffold to model pitting corrosion based on the corrosion rate and localization degree. To address the surface-based nature of corrosion, a Weibull distribution function was employed to apply flux at the outer nodes. A Python code was developed to create node sets on the scaffold's outer surface and allocate flux through the Weibull distribution at each node. Each node in the scaffold initially received a concentration correlating with the magnesium's starting concentration. Elements with Mg concentrations falling below a defined threshold (indicative of Mg(OH)2 formation) post-corrosion simulation were removed for subsequent mechanical simulations. In these simulations, Mg was considered as an isotropic, elastic-perfectly plastic material, introducing fracture via a ductile failure model. Consequently, this simulation approach effectively evaluates the influence of corrosion on the mechanical behavior of biodegradable scaffolds-a crucial aspect in designing such scaffolds for biomedical applications. This approach draws inspiration from the research article by Mohammad Marvi-Mashhadi and Wahaaj Ali, etal. titled 'Simulation of corrosion and mechanical degradation of additively manufactured Mg scaffolds in simulated body fluid'.
This model will cover Following topics:
1. How to model the corrosion in Bone scaffold as a function of fluid diffusion.
2. How to modelling pitting corrosion based on varying corrosion rate
3. Comparison of mechanical response of Degraded and normal scaffold specimen.
4. Modelling degradation as a function of fluid diffusion time
5. Python scripting to model the isotropic diffusion is simulated body fluid environment.

[@Valera197615]

Thank you. I wish happiness and good health to all good people.

[@xuanshi4350]

Nice nice nice!!! First step, how do you model the TPMS lattice?

[@ABAQUSPOWER]

Great work!