Many shape memory alloy (SMA) applications exploit superelasticity in a bending mode, yet the large displacements and rotations associated with bending of slender structures make controlled experiments difficult. A custom pure bending fixture was built to perform experiments on superelastic NiTi tubes. To understand the bending results, the tubes were also characterized in uniaxial tension and compression, where a custom fixture was utilized to avoid buckling. In addition to measuring the global mechanical response, stereo digital image correlation (DIC) was used in all the experiments to capture the local surface displacement and strain fields. Consistent with the tension/compression data, our bending experiments showed a significant shift of the neutral axis towards the compression side. Also, the tube had strain localization on the tension side, but no such localization on the compression side. Detailed analysis of the strain distribution across the tube diameter revealed that the usual assumption of beam theory, that plane sections remain plane, did not hold along the tension side. Averaged over a few diameters of gage length, plane sections remain plane is a reasonable assumption and can be used to predict the global moment–curvature response. However, this assumption should be used with caution since it can under/over predict local strains by as much as 2× due to the localized deformation morphology.
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ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 18–21, 2011
Scottsdale, Arizona, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5471-6
PROCEEDINGS PAPER
Bending of Superelastic Shape Memory Alloy Tubes
Benjamin Reedlunn,
Benjamin Reedlunn
University of Michigan, Ann Arbor, MI
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Christopher Churchill,
Christopher Churchill
University of Michigan, Ann Arbor, MI
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Emily Nelson,
Emily Nelson
University of Michigan, Ann Arbor, MI
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Samantha Daly,
Samantha Daly
University of Michigan, Ann Arbor, MI
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John Shaw
John Shaw
University of Michigan, Ann Arbor, MI
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Benjamin Reedlunn
University of Michigan, Ann Arbor, MI
Christopher Churchill
University of Michigan, Ann Arbor, MI
Emily Nelson
University of Michigan, Ann Arbor, MI
Samantha Daly
University of Michigan, Ann Arbor, MI
John Shaw
University of Michigan, Ann Arbor, MI
Paper No:
SMASIS2011-4906, pp. 249-258; 10 pages
Published Online:
February 7, 2012
Citation
Reedlunn, B, Churchill, C, Nelson, E, Daly, S, & Shaw, J. "Bending of Superelastic Shape Memory Alloy Tubes." Proceedings of the ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1. Scottsdale, Arizona, USA. September 18–21, 2011. pp. 249-258. ASME. https://doi.org/10.1115/SMASIS2011-4906
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