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Title: A computational study of stent performance by considering vessel anisotropy and residual stresses
Authors: Schiavone, Alessandro
Zhao, Liguo
Keywords: Stent deployment
Vessel anisotropy
Finite element
Residual stresses
Biomechanical forces
Issue Date: 2016
Publisher: © Elsevier
Citation: SCHIAVONE, 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.
Abstract: 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.
Description: This 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.
Sponsor: 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.
Version: Accepted for publication
DOI: 10.1016/j.msec.2016.01.064
URI: https://dspace.lboro.ac.uk/2134/20270
Publisher Link: http://dx.doi.org/10.1016/j.msec.2016.01.064
ISSN: 0928-4931
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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