Physical simulation of the random failure of implanted braided NiTi stents

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00432500" target="_blank" >RIV/68378271:_____/14:00432500 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388998:_____/14:00432500

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s11665-014-0916-9" target="_blank" >http://dx.doi.org/10.1007/s11665-014-0916-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11665-014-0916-9" target="_blank" >10.1007/s11665-014-0916-9</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Physical simulation of the random failure of implanted braided NiTi stents

Popis výsledku v původním jazyce

A problem of random clinical failures of the braided esophageal NiTi stents has been addressed by performing physical simulation experiments on helical NiTi springs loaded in cyclic tension in air, water, and simulated biological fluid. Strains and stresses involved in spring deformation were analyzed through simulation by FEM implemented SMA model. It was found that the fatigue life of NiTi springs is significantly lower in fluids than in the air pointing toward the corrosion fatigue mechanism. There is, however, a fatigue limit roughly corresponding to the onset of martensitic transformation in the wire, which is not common for corrosion fatigue. It is proposed that surface TiO2 oxide cracking plays major role in that. Once the oxide layer on the NiTi wire surface fractures, typically during the first mechanical cycle, cracks in the oxide layer periodically open and close during subsequent mechanical cycling.

Název v anglickém jazyce

Physical simulation of the random failure of implanted braided NiTi stents

Popis výsledku anglicky

A problem of random clinical failures of the braided esophageal NiTi stents has been addressed by performing physical simulation experiments on helical NiTi springs loaded in cyclic tension in air, water, and simulated biological fluid. Strains and stresses involved in spring deformation were analyzed through simulation by FEM implemented SMA model. It was found that the fatigue life of NiTi springs is significantly lower in fluids than in the air pointing toward the corrosion fatigue mechanism. There is, however, a fatigue limit roughly corresponding to the onset of martensitic transformation in the wire, which is not common for corrosion fatigue. It is proposed that surface TiO2 oxide cracking plays major role in that. Once the oxide layer on the NiTi wire surface fractures, typically during the first mechanical cycle, cracks in the oxide layer periodically open and close during subsequent mechanical cycling.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Materials Engineering and Performance

ISSN

1059-9495

e-ISSN

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Svazek periodika

23

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

2650-2658

Kód UT WoS článku

000339010700053

EID výsledku v databázi Scopus

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