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Statements

Subject Item
n2:RIV%2F68378271%3A_____%2F14%3A00432500%21RIV15-GA0-68378271
rdf:type
n8:Vysledek skos:Concept
dcterms: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.
dcterms:title
Physical simulation of the random failure of implanted braided NiTi stents Physical simulation of the random failure of implanted braided NiTi stents
skos:prefLabel
Physical simulation of the random failure of implanted braided NiTi stents Physical simulation of the random failure of implanted braided NiTi stents
skos:notation
RIV/68378271:_____/14:00432500!RIV15-GA0-68378271
n3:aktivita
n14:I n14:P
n3:aktivity
I, P(7E11058), P(GAP107/12/0800), P(GPP108/12/P111)
n3:cisloPeriodika
7
n3:dodaniDat
n13:2015
n3:domaciTvurceVysledku
n4:5098203 n4:8696500 n4:7613628 n4:7813880 n4:2311623
n3:druhVysledku
n12:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
36567
n3:idVysledku
RIV/68378271:_____/14:00432500
n3:jazykVysledku
n15:eng
n3:klicovaSlova
electron microscopy; failure analysis; mechanical testing
n3:klicoveSlovo
n5:electron%20microscopy n5:mechanical%20testing n5:failure%20analysis
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[7769AB743C48]
n3:nazevZdroje
Journal of Materials Engineering and Performance
n3:obor
n17:BM
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
8
n3:projekt
n7:7E11058 n7:GPP108%2F12%2FP111 n7:GAP107%2F12%2F0800
n3:rokUplatneniVysledku
n13:2014
n3:svazekPeriodika
23
n3:tvurceVysledku
Petrenec, M. Hiřmanová, Klára Recman, L. Pilch, Jan Sedlák, Petr Šittner, Petr Heller, Luděk Racek, Jan
n3:wos
000339010700053
s:issn
1059-9495
s:numberOfPages
9
n16:doi
10.1007/s11665-014-0916-9