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Monday, May 8, 2006 - 5:10 PM
MEM2.6

Full-Field Measurement of Strain and Transformation in Nitino

K. E. Perry, ECHOBIO, LLC., Bainbridge Island, WA; P. E. Labossiere, ECHOBIO LLC, Bainbridge Island, WA

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.

Summary: The presentation includes our latest work in the development and application of phase shifted moire interferometry to the measurement of strain in Nitinol.