Study on identifying a consistent metric for comparison of fatigue performance of superelastic Nickel Titanium across different geometries and loading conditions.

Shivram Kashyap Sridhar¹, Rohit Dhume², Mallika Kamarajugadda³, James Hallquist³, Jochen Ulmer⁴, Alan R Pelton⁵

¹Medtronic Global Technology and Innovation, 710 Medtronic Parkway, Fridley, 55432, MN, USA. Electronic address: shivrams@alumni.cmu.edu.

²Medtronic Structural Heart and Aortic, 8200 Coral Sea St NE, Mounds View, 55112, MN, USA.

³Medtronic Global Technology and Innovation, 710 Medtronic Parkway, Fridley, 55432, MN, USA.

⁴EUROFLEX GmbH, Kaiser-Friedrich-Straße 7, Pforzheim, 75172, Germany; G.RAU Inc, 5617 Scotts Valley Dr Suite 100, Scotts Valley, 95066, CA, USA.

⁵G.RAU Inc, 5617 Scotts Valley Dr Suite 100, Scotts Valley, 95066, CA, USA; Department of Materials Science and Engineering, Stanford University, Stanford, 94305, CA, USA.

PubMed DOI

Abstract

In this study, 50.8 at.% superelastic Ni-Ti material was compared for differences in fatigue performance and its quantification based on geometry and testing conditions. Two different loading conditions and specimen geometries cut from the same tube raw material, namely dogbone in tension-tension fatigue and stent cell in bending fatigue are compared. Digital Image Correlation (DIC) was used to ca…

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