Počet záznamů: 1
Simulations of Self-Expanding Braided Stent Using Macroscopic Model of NiTi Shape Memory Alloys Covering R-Phase
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SYSNO ASEP 0429396 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Simulations of Self-Expanding Braided Stent Using Macroscopic Model of NiTi Shape Memory Alloys Covering R-Phase Tvůrce(i) Frost, Miroslav (UT-L) RID, ORCID
Sedlák, Petr (UT-L) RID, ORCID
Kruisová, Alena (UT-L) RID
Landa, Michal (UT-L) RIDZdroj.dok. Journal of Materials Engineering and Performance. - : Springer - ISSN 1059-9495
Roč. 23, č. 7 (2014), s. 2584-2590Poč.str. 7 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova braided stent ; numerical simulation ; R-phase ; shape memory alloys Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA14-15264S GA ČR - Grantová agentura ČR GP14-28306P GA ČR - Grantová agentura ČR GA13-13616S GA ČR - Grantová agentura ČR Institucionální podpora UT-L - RVO:61388998 UT WOS 000339010700044 EID SCOPUS 84904805759 DOI 10.1007/s11665-014-0966-z Anotace Self-expanding stents or stentgrafts made from Nitinol superelastic alloy are widely used for a less invasive treatment of disease-induced localized flow constriction in the cardiovascular system. The therapy is based on insertion of a stent into a blood vessel to maintain the inner diameter of the vessel; it provides highly effective results at minimal cost and with reduced hospital stays. However, since stent is an external mechanical healing tool implemented into human body for quite a long time, information on the mechanical performance of it is of fundamental importance with respect to patient_s safety and comfort. Advantageously, computational structural analysis can provide valuable information on the response of the product in an environment where in vivo experimentation is extremely expensive or impossible. With this motivation, a numerical model of a particular braided self-expanding stent was developed. As a reasonable approximation substantially reducing computational demands, the stent was considered to be composed of a set of helical springs with specific constrains reflecting geometry of the structure. An advanced constitutive model for NiTi-based shape memory alloys including R-phase transition was employed in analysis. Comparison to measurements shows a very good match between the numerical solution and experimental results. Relation between diameter of the stent and uniform radial pressure on its surface is estimated. Information about internal phase and stress state of the material during compression loading provided by the model is used to estimate fatigue properties of the stent during cyclic loading. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2015
Počet záznamů: 1