About: Physical simulation of the random failure of implanted braided NiTi stents

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	Physical simulation of the random failure of implanted braided NiTi stents Physical simulation of the random failure of implanted braided NiTi stents (en)
skos:prefLabel	Physical simulation of the random failure of implanted braided NiTi stents Physical simulation of the random failure of implanted braided NiTi stents (en)
skos:notation	RIV/68378271:_____/14:00432500!RIV15-GA0-68378271
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(7E11058), P(GAP107/12/0800), P(GPP108/12/P111)
http://linked.open...iv/cisloPeriodika	7
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Hiřmanová, Klára Šittner, Petr Racek, Jan Pilch, Jan Heller, Luděk
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	36567
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/14:00432500
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	electron microscopy; failure analysis; mechanical testing (en)
http://linked.open.../riv/klicoveSlovo	electron microscopy mechanical testing failure analysis
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[7769AB743C48]
http://linked.open...i/riv/nazevZdroje	Journal of Materials Engineering and Performance
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	SmartNets-The Transformation from Collaborative Knowledge Exploration Networks into Cross Sectoral and Service Oriented Integrated Value Systems Fatigue of NiTiX High Temperature Shape Memory Alloy Actuators /FACT/ Optimization of microstructure and properties of SMA filaments through control of recovery processes during heat treatment by ultra short DC pulse
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	23
http://linked.open...iv/tvurceVysledku	Sedlák, Petr Heller, Luděk Šittner, Petr Racek, Jan Pilch, Jan Hiřmanová, Klára Petrenec, M. Recman, L.
http://linked.open...ain/vavai/riv/wos	000339010700053
issn	1059-9495
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s11665-014-0916-9

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