This paper describes an experimental study of stress-induced martensitic phase transformation in the shape memory alloy Nickel-Titanium, also known by the trade name Nitinol. The rich local thermo-mechanical interactions that underlie phase transformation are examined using three-dimensional Digital Image Correlation (to determine local strain fields) and infrared imaging (to determine local thermal fields). We quantify the complex local interactions between released/absorbed latent heat and the extent of transformation, and explore the characteristics of the phase fronts. There exists a remarkable amount of memory in the pattern of the martensitic formation from cycle to cycle. The initial pattern in which the martensite nucleates and propagates in the first cycle strongly dictates how the martensite nucleates and propagates in future cycles. The presence of this cycle-to-cycle strain pattern memory indicates that the local elastic stress fields in the martensite are driven by a dislocation structure and martensitic nuclei that largely stabilize during the first loading cycle.
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ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 28–October 1, 2010
Philadelphia, Pennsylvania, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-4415-1
PROCEEDINGS PAPER
Stress-Induced Martensitic Phase Transformation in Nitinol Under Hard Cyclic Loading Available to Purchase
Kyubum Kim,
Kyubum Kim
The University of Michigan, Ann Arbor, MI
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K. Anne Juggernauth,
K. Anne Juggernauth
The University of Michigan, Ann Arbor, MI
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Samantha H. Daly
Samantha H. Daly
The University of Michigan, Ann Arbor, MI
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Kyubum Kim
The University of Michigan, Ann Arbor, MI
K. Anne Juggernauth
The University of Michigan, Ann Arbor, MI
Samantha H. Daly
The University of Michigan, Ann Arbor, MI
Paper No:
SMASIS2010-3609, pp. 1-7; 7 pages
Published Online:
April 4, 2011
Citation
Kim, K, Juggernauth, KA, & Daly, SH. "Stress-Induced Martensitic Phase Transformation in Nitinol Under Hard Cyclic Loading." Proceedings of the ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1. Philadelphia, Pennsylvania, USA. September 28–October 1, 2010. pp. 1-7. ASME. https://doi.org/10.1115/SMASIS2010-3609
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