Investigation of Various Bend and Free Recovery Systems for Measuring Transformation Temperatures of Nickel Titanium

Tuesday, May 14, 2019
Saal 4 (Hall 4) (Bodenseeforum Konstanz)
Mr. Dave Plumley , Fort Wayne Metals, Fort Wayne, IN
Mrs. Jenica L. Kolhoff , Fort Wayne Metals, Fort Wayne, IN
Mr. Craig Myers , Fort Wayne Metals, Fort Wayne, IN
Transformation temperature of Nitinol is a critical attribute to the final device performance. Currently, multiple test methods exist to determine the active austenite finish temperature (Active Af) of an array of Nitinol devices.

The original test method used since the 1990’s, involves the operator visually monitoring the specimen until 100% recovery is reached. In contrast, the methods described in ASTM F2082 plot displacement of the material over a specified temperature range. The Active Af is defined using the tangent or 95% recovery method.

This research will evaluate the resulting temperature differences generated between three bend and free recovery (BFR) systems.

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