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Published June 2007 | public
Journal Article

Stress-induced martensitic phase transformation in thin sheets of Nitinol


Using the in situ optical technique known as digital image correlation (DIC), full-field quantitative strain maps of localization have been experimentally obtained for the first time in thin sheets of Nitinol. The use of DIC provides new information connecting previous observations on the micro- and macro-scales. It shows that the transformation initiates before the formation of localized bands, and the strain inside the bands does not saturate when they nucleate. The effect of rolling texture on the macroscopic stress–strain behavior was observed and it is shown that the resolved stress criterion or Clausius–Clapeyron relation does not hold for polycrystalline Nitinol. Finally, the effect of geometric defects on localization behavior was observed.

Additional Information

© 2007 Acta Materialia Inc. Published by Elsevier Ltd. Received 13 September 2006; received in revised form 7 February 2007; accepted 8 February 2007; Available online 6 April 2007. We gratefully acknowledge the support of the Army Research Office (W911NF-O4-1-0156), the National Science Foundation (DMS-0311788) and the Powell Foundation. It is a pleasure to acknowledge the suggestions and assistance we received from Professor Daniel Rittel of the Technion during his visits to Caltech throughout this work, as well as the technical expertise and experimental suggestions of Petros Arakelian throughout this project. We gratefully acknowledge Correlated Solutions, Inc. for providing the DIC correlation software used in these experiments.

Additional details

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October 25, 2023