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Shape Memory and Superelasticity
Published in: Shape Memory and Superelasticity 2/2015

01-06-2015

Inclusions Size-based Fatigue Life Prediction Model of NiTi Alloy for Biomedical Applications

Authors: Marco Fabrizio Urbano, Andrea Cadelli, Frank Sczerzenie, Pietro Luccarelli, Stefano Beretta, Alberto Coda

Published in: Shape Memory and Superelasticity | Issue 2/2015

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Abstract

Current standards consider the size and distribution of inclusions in semi-finished material, but do not place requirements on final biomedical devices made of NiTi shape memory alloys. In this paper, we analyze this by comparing the fatigue performances of NiTi superelastic wires obtained by different processes through a simple bilinear model of fatigue response in terms of strain life. The fracture surfaces of failed wires are analyzed through SEM microscopy and data regarding the presence of particles, and their morphology is recorded and analyzed using Type-I extreme value distribution. The results show a strong correlation between the fatigue limit of wires (in terms of strain) and the predicted extreme values of inclusions at fracture origin. Then, following the concept of treating the inclusions as ‘small cracks,’ a simple relationship between fatigue limit strain range and inclusion size is proposed based on ΔKth data from the literature. The model is compared with the fatigue data obtained from the tested wires.
previous article Fundamental Development on Utilizing the R-phase Transformation in NiTi Shape Memory Alloys
next article In Situ Neutron Diffraction Studies of Large Monotonic Deformations of Superelastic Nitinol

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Metadata
Title
Inclusions Size-based Fatigue Life Prediction Model of NiTi Alloy for Biomedical Applications
Authors
Marco Fabrizio Urbano
Andrea Cadelli
Frank Sczerzenie
Pietro Luccarelli
Stefano Beretta
Alberto Coda
Publication date
01-06-2015
Publisher
Springer International Publishing
Published in
Shape Memory and Superelasticity / Issue 2/2015
Print ISSN: 2199-384X
Electronic ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-015-0016-1

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