Abstract
Various approaches for obtaining a cyclic stress-strain curve for superelastic nitinol are evaluated. Smooth test specimens made from seamless drawn tubing and equivalently processed as medical device materials are tested according to one of three methods. The technique of phase shifted moiré interferometry is used to provide in situ strain data with automated data analysis using spatially correlated fringe patterns during the cyclic stress-strain testing. Selected results demonstrate the exceptional spatial and temporal resolution of the measurement system over a wide range of deformations and time scales. General trends in the testing and observations on the feasibility and application of the various methods to medical device design are discussed.
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Acknowledgements
The authors would like to thank Tim Johnson for a critical review of an early draft of this manuscript.
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© 2016 The Society for Experimental Mechanics, Inc.
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Perry, K., Teiche, A., McGieson, I. (2016). Local Strain Analysis of Nitinol During Cyclic Loading. In: Beese, A., Zehnder, A., Xia, S. (eds) Fracture, Fatigue, Failure and Damage Evolution, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-21611-9_20
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DOI: https://doi.org/10.1007/978-3-319-21611-9_20
Publisher Name: Springer, Cham
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