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dc.contributor.authorWeafer, F. M.
dc.contributor.authorBruzzi, M. S.
dc.date.accessioned2018-09-20T16:28:17Z
dc.date.available2018-09-20T16:28:17Z
dc.date.issued2014-04-26
dc.identifier.citationWeafer, F. M. Bruzzi, M. S. (2014). Influence of microstructure on the performance of nitinol: a computational analysis. Journal of Materials Engineering and Performance 23 (7), 2539-2544
dc.identifier.issn1059-9495,1544-1024
dc.identifier.urihttp://hdl.handle.net/10379/14400
dc.description.abstractOne material that has found particular favor for use in biomedical endovascular stents is the near equi-atomic NiTi alloy, Nitinol. One remarkable trait exhibited by this superelastic material is the improvement of its fatigue performance with increasing mean strain (Ref 1, 2). Clarification into this phenomenon still remains incomplete in the literature. This study proposes a microstructural explanation for this unique macroscopic behavior; it is hypothesized stress-induced martensite (SIM) will stabilize with increasing strain which, in turn, leads to the observed increase in fatigue life. Finite element analysis (FEA) is employed to investigate the behavior of a "v-strut" stent subcomponent under various strain levels. The volume fraction of SIM is analyzed to identify its potential influence on macroscopic response and, ultimately, fatigue behavior. In addition, a computational investigation is performed on the effect of crystallographic texture on macroscopic response. Granular transformational behavior is analyzed using FEA models with realistic and idealized grain structures, specifically evaluating the effect of individual grain orientations on the stress-induced martensite transformation.
dc.publisherSpringer Nature
dc.relation.ispartofJournal of Materials Engineering and Performance
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/ie/
dc.subjectfatigue
dc.subjectnitinol
dc.subjectmicrostructure
dc.subjectsuperelasticity
dc.subjectshape-memory alloy
dc.subjectpolycrystalline niti
dc.titleInfluence of microstructure on the performance of nitinol: a computational analysis
dc.typeArticle
dc.identifier.doi10.1007/s11665-014-1017-5
dc.local.publishedsourcehttps://link.springer.com/content/pdf/10.1007%2Fs11665-014-1017-5.pdf
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Attribution-NonCommercial-NoDerivs 3.0 Ireland
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Ireland