Fatigue Crack Initiation in Superelastic Nitinol

Kenneth Perry; Alex Teiche

doi:10.1520/STP155920130030

SYMPOSIA PAPER Published: 30 September 2013

STP155920130030

Fatigue Crack Initiation in Superelastic Nitinol

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Phase shifted moiré interferometry is used to study fatigue initiation in superelastic Nitinol. Notched four-point bend coupon samples were fatigue tested according to a multi-level amplitude test protocol tailored for medical implant applications. Fringe patterns of local strain measurements are presented for three loading sequences based on the type of loading and range of anticipated strains in service. The effect of an initial series of pre-load cycles is examined and resulting life data is accompanied by local strain results highlighting the unique mechanisms associated with the initiation of fatigue cracks and the development of effective test methods and protocols.

Author Information

Perry, Kenneth, E.

ECHOBIO LLC, Bainbridge Island, WA, US

Teiche, Alex

ECHOBIO LLC, Bainbridge Island, WA, US

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Details

Developed by Committee: E08

Pages: 1–18

DOI: 10.1520/STP155920130030

ISBN-EB: 978-0-8031-7584-6

ISBN-13: 978-0-8031-7545-7

Fatigue Crack Initiation in Superelastic Nitinol

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