Numerical Simulation of the Deployment Process of a New Stent Produced by Ultrasonic-Microcasting: The Role of the Balloon’s Constitutive Modeling
The application of the Finite Element Method (FEM) allows to predict the behavior of a stent during the deployment process and when in service, being a powerful tool to use in its design and development. As the promoter of the stent expansion, the balloon plays a very important role, offering a strong influence on its performance, mainly during the deployment process. This element is usually built in a rubber-like material such as polyurethane, being modeled as linear elastic or hyperelastic with a Mooney–Rivlin description. This work aims, through FEM analysis, the study of the influence of both adopted material formulation—linear elastic or hyperelastic—as well as the respective material constants and properties for the balloon modeling on the performance of a biocompatible magnesium stent regarding a set of metrics. Furthermore, a comparison is established between those results and the obtained ones in the scenario of application of pressure directly in the inner surface of the stent, neglecting the balloon. The obtained results suggest that material formulation has a direct influence on the stent deployment process. Concerning to hyperelastic models, two different combinations of parameter values were tested, showing a similar behavior regarding the considered metrics, while the linear elastic model presents comparable values for the expansion pressure and recoil, but different in terms of dogboning and foreshortening. The scenario of neglecting the balloon suggests providing the highest values of dogboning, foreshortening, and recoil, with an expansion pressure inferior to that of hyperelastic models.
This work was supported by FEDER funds through the COMPETE program with the reference project PTDC/SEM-TEC/3827/2014 and PTDC/EMS-TEC/0702/2014. Additionally, this work was supported by FCT with the reference project UID/EEA/04436/2013 and by FEDER funds through the COMPETE 2020 with the reference project POCI-01-0145-FEDER-006941.
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