ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 13 February 2009
Page Count: 5

Full-Field Measurements of Fracture Initiation and Crack Growth in Superelastic Nitinol

Perry, Kenneth E.
ECHOBIO LLC, Bainbridge Island, WA

Labossiere, Paul E.
ECHOBIO LLC, Bainbridge Island, WA

(Received 2 June 2008; accepted 1 December 2008)

Abstract

We present results for full-field measurements of crack tip deformation fields in Nitinol using high sensitivity moiré interferometry. Three fatigue loading scenarios are examined illustrating the effect of stress induced martensite transformations at the tip of the crack. Understanding the behavior of fatigue crack growth is paramount to the successful use of this highly complex material response, especially for such application as implantable medical devices. The results demonstrate the sensitivity of heterogeneous phase transformations on the crack growth behavior.

Keywords:
moiré interferometry, nitinol, fracture, stent, full-field strain, superelastic

Paper ID: JAI101874
DOI: 10.1520/JAI101874
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