A computational study of stent performance by considering vessel anisotropy and residual stresses
journal contributionposted on 2016-02-09, 13:26 authored by Alessandro Schiavone, Liguo Zhao
Finite element simulations of stent deployment were carried out by considering the intrinsic anisotropic behaviour, described by a Holzapfel-Gasser-Ogden (HGO) hyperelastic anisotropic model, of individual artery layers. The model parameters were calibrated against the experimental stress-stretch responses in both circumferential and longitudinal directions. The results showed that stent expansion, system recoiling and stresses in the artery layers were greatly affected by vessel anisotropy. Following deployment, deformation of the stent was also modelled by applying relevant biomechanical forces, i.e. in-plane bending and radial compression, to the stent-artery system, for which the residual stresses generated during deployment were particularly accounted for. Residual stresses were found to have a significant influence on the deformation of the system, resulting in a re-distribution of stresses and a change of the system flexibility. The results were also utilised to interpret the mechanical performance of stent after deployment.
The research leading to these results received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. PIRSES-GA-2013- 610547 TAMER.
- Mechanical, Electrical and Manufacturing Engineering
Published inMaterials Science and Engineering: C Materials for Biological Applications
CitationSCHIAVONE, A. and ZHAO, L., 2016. A computational study of stent performance by considering vessel anisotropy and residual stresses. Materials Science and Engineering: C Materials for Biological Applications, 62, pp.307-316.
- AM (Accepted Manuscript)
Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
NotesThis paper was accepted for publication in the journal Materials Science and Engineering: C Materials for Biological Applications and the definitive published version is available at http://dx.doi.org/10.1016/j.msec.2016.01.064.