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Shape Memory and Superelasticity
Erschienen in: Shape Memory and Superelasticity 1/2023

18.01.2023 | TECHNICAL ARTICLE

Rotary Bend Fatigue of Nitinol to One Billion Cycles

verfasst von: J. D. Weaver, G. M. Sena, K. I. Aycock, A. Roiko, W. M. Falk, S. Sivan, B. T. Berg

Erschienen in: Shape Memory and Superelasticity | Ausgabe 1/2023

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Abstract

Nitinol implants, especially those used in cardiovascular applications, are typically expected to remain durable beyond 108 cycles, yet literature on ultra-high cycle fatigue of nitinol remains relatively scarce and its mechanisms not well understood. To investigate nitinol fatigue behavior in this domain, we conducted a multifaceted evaluation of nitinol wire subjected to rotary bend fatigue that included detailed material characterization and finite element analysis as well as post hoc analyses of the resulting fatigue life data. Below approximately 105 cycles, cyclic phase transformation, as predicted by computational simulations, was associated with fatigue failure. Between 105 and 108 cycles, fractures were relatively infrequent. Beyond 108 cycles, fatigue fractures were relatively common depending on the load level and other factors including the size of non-metallic inclusions present and the number of loading cycles. Given observations of both low cycle and ultra-high cycle fatigue fractures, a two-failure model may be more appropriate than the standard Coffin-Manson equation for characterizing nitinol fatigue life beyond 108 cycles. This work provides the first documented fatigue study of medical grade nitinol to 109 cycles, and the observations and insights described will be of value as design engineers seek to improve durability for future nitinol implants.
Vorheriger Artikel Thin-Film Superelastic Alloys for Stretchable Electronics
Nächster Artikel Numerical Investigation on the Effect of Inclusions on the Local Fatigue Strain in Superelastic NiTi Alloy
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Fußnoten
1
\(\Phi \left(x\right)=P\left(Z\le x\right)=\frac{1}{\sqrt{2\pi }}\underset{-\infty }{\overset{x}{\int }}\mathrm{exp}\left\{-\frac{{u}^{2}}{2}\right\}\mathrm{d}u.\)
 
2
Due to numerical convergence issues, the parameter \({\varepsilon }_{50}\) was “hard” set to 0.56% strain rather than identified using maximum likelihood techniques. This choice for \({\varepsilon }_{50}\) was based on inspection of the observed cycles to fracture data. Samples run at this nominal strain level of 0.56% saw roughly equal proportions fracture before and after 10 million cycles. As a result of setting the parameter, the fit of the \({\varepsilon }_{50}\) parameter may not be optimal, and the confidence bounds on \({\varepsilon }_{50}\) could not be calculated. Work to improve the numerical algorithm to treat \({\varepsilon }_{50}\) as a true model parameter is ongoing.
 
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Metadaten
Titel
Rotary Bend Fatigue of Nitinol to One Billion Cycles
verfasst von
J. D. Weaver
G. M. Sena
K. I. Aycock
A. Roiko
W. M. Falk
S. Sivan
B. T. Berg
Publikationsdatum
18.01.2023
Verlag
Springer US
Erschienen in
Shape Memory and Superelasticity / Ausgabe 1/2023
Print ISSN: 2199-384X
Elektronische ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-022-00409-7

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