Calibration Framework for Modeling Nonlinear Viscoelastic–Plastic Behavior of Bioresorbable Polymers in Finite Element Analysis for Stent Applications
Nicklas Fiedler, Thomas Kleine, Stefan Oschatz, Selina Schultz, Niels Grabow, Kerstin Lebahn
TL;DR
This paper introduces a method to validate finite element models for bioresorbable polymers used in stent design using 2D substructures and material testing.
Contribution
A new framework for calibrating material models in FEA for bioresorbable polymers using 2D substructures and multiple constitutive models.
Findings
PRF and TN models provided better predictions of polymer behavior than LEP models.
PRF model was most accurate for PLLA, while all models had limitations for PGA-co-TMC.
A simplified 2D setup enabled efficient material screening and design optimization for stents.
Abstract
Finite element analysis (FEA) is common in biomedical engineering for combining design and material development, with model validation crucial for accurate prediction of material behavior. Simplified geometries are commonly needed in stent development due to high effort in prototype manufacturing. This study outlines a methodology for FEA validation related to stent development-related FEA validation using injection-molded planar 2D substructures from a stent design with two types of polymers: poly(l-lactide) (PLLA) and poly(glycolide-co-trimethylene carbonate) (PGA-co-TMC). Specimens underwent quasi-static and cyclic testing, including loading, stress relaxation, unloading, and strain recovery. The material model coefficients for FEA were calibrated for three different constitutive models: linear elastic–plastic (LEP), Parallel Rheological Framework (PRF), and Three-Network (TN) model.…
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Taxonomy
TopicsElasticity and Material Modeling · Coronary Interventions and Diagnostics · Orthopaedic implants and arthroplasty