Numerical durability evaluation of Nitinol stent
| dc.contributor.author | Ackermann, Michal | |
| dc.contributor.author | Čapek, Lukáš | |
| dc.date.accessioned | 2015-10-26 | |
| dc.date.available | 2015-10-26 | |
| dc.date.issued | 2012 | |
| dc.description.abstract | Shape memory alloys, such as binary NiTi alloy, have gained the attention of researchers, thanks to their remarkable properties. In comparison with other usually used materials, they exhibit large reversible strains (pseudoelasticity) and especially a heat-induced regaining of their original shape even in the case of significantly large deformations (shape memory effect) (Yahia 2000; Lagoudas 2008). Even though many articles have been written on account of these materials (Duerig et al. 1999; Kleinstreuer et al. 2008; Nayan et al. 2009), only a few deal with their fatigue properties. The need to know and understand the behaviour of the material under cyclic loading came from a project which deals with coronary Nitinol stent grafts. Stents (Figure 1), which form a skeleton of an implant, are made up of NiTi wires. After an implantation of a stent graft into a blood vessel, it is subjected to cyclic change of its diameter due to the alternation between the systolic and diastolic blood pressure. The aim of this study was to carry out fatigue analysis of a Nitinol stent, subjected to a cyclic crush test, and to reveal critical areas of its construction. In previous work, the dependency of stress amplitude versus number of cycles until the failure of a specimen was evaluated experimentally. This dependency is called Wo¨hler’s or the S –N curve, and is one of the basic indicators that define the fatigue properties of a material. Thanks to our knowledge of the S –N curve of NiTi alloy, we were able to predict the life of a Nitinol stent with the support of data gained from a crush test of a stent performed using the finite element method (FEM) in MSC Marc software. | en |
| dc.format | text | |
| dc.identifier.issn | 1476-8259 | |
| dc.identifier.scopus | 2-s2.0-84874217249 | |
| dc.identifier.uri | https://dspace.tul.cz/handle/15240/13295 | |
| dc.language.iso | en | |
| dc.publisher | Technická Univerzita v Liberci | cs |
| dc.publisher | Technical university of Liberec, Czech Republic | en |
| dc.relation.ispartof | Computer methods in biomechanics and biomedical engineering | en |
| dc.source | j-scopus | |
| dc.title | Numerical durability evaluation of Nitinol stent | en |
| dc.type | Article | |
| local.citation.epage | 101 | |
| local.citation.spage | 99 | |
| local.faculty | Faculty of Mechanical Engineering | |
| local.fulltext | yes | |
| local.identifier.pubmed | 23009440 | |
| local.relation.volume | 15 Suppl 1 |
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