Full-Field Measurement of Strain and Transformation in Nitino
Dr. Kenneth E. Perry1 and Dr. Paul E. Labossiere2, 1Echobio, LLC, 579 Azalea Avenue, Bainbridge Island, WA 98110, 2Mechanical Engineering, University of Washington, 209 Mechanical Engineering Building, Seattle, WA 98195-2600

Phase shifted moire interferometry is used to measure the full field,
in-plane strain during tension, bending and compact tension loading of
Nitinol test samples.  Differences between the global and full field
measurements reveal the effects of localized transformation behavior.
These observations are used to improve our understanding and guide the
development of advanced numerical methods for Nitinol component
modeling.  Results for several heat treatments of commercially
available superelastic Nitinol are presented for the various load and
specimen configurations.  Lastly, the experimental approach is applied
to an actual Nitinol component to demonstrate the opportunities for
improved material characterization, numerical modeling and design
validation.

Session 2: Materials Characterization and Experimentation

The Preliminary Program for The International Conference on Shape Memory and Superelastic Technologies (May 7-11, 2006)