"Petrenec, M." . "[7769AB743C48]" . "electron microscopy; failure analysis; mechanical testing"@en . . "7" . . "RIV/68378271:_____/14:00432500!RIV15-GA0-68378271" . . "Physical simulation of the random failure of implanted braided NiTi stents" . . "I, P(7E11058), P(GAP107/12/0800), P(GPP108/12/P111)" . . . "Hi\u0159manov\u00E1, Kl\u00E1ra" . "Recman, L." . . "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." . "1059-9495" . "23" . . "Pilch, Jan" . "Sedl\u00E1k, Petr" . "RIV/68378271:_____/14:00432500" . . "Journal of Materials Engineering and Performance" . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . . . "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 . . "\u0160ittner, Petr" . "Physical simulation of the random failure of implanted braided NiTi stents"@en . . "5"^^ . . "36567" . "8"^^ . . . . "9"^^ . . . "10.1007/s11665-014-0916-9" . "Heller, Lud\u011Bk" . . . "Racek, Jan" . "Physical simulation of the random failure of implanted braided NiTi stents"@en . "Physical simulation of the random failure of implanted braided NiTi stents" . . "000339010700053" .