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Mechanical Response of Shape Memory Alloys Under a Rapid Heating Pulse - Part II

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Abstract

We report on a new experimental system for exploring the thermo-mechanical response of shape memory wires under a rapid heating pulse. The new setup enables the force and displacement generated by the phase transforming wire to be measured with a μs time resolution. In addition, part of the tests incorporated high-speed infrared and visible light photography. The experimental system enables exploring several unique dynamic effects. In particular, stress levels of 1.6 GPa with negligible plastic deformation and elastic strain rates of 103 s−1 are observed. Force measurements reveal a dead time of ~20 μs between the end of the electric pulse and the onset of the stress rise in the SMA wire. The high strain rate, generated by the phase transformation, induces string-like vibrations of the SMA wire that result in strong stress vibrations. The developed experimental system opens the way for studying the kinetics of the phase transformation.

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Acknowledgments

This research was funded by a research grant (ZH003) from General Motors Corporation – Universal Motors Israel Technology Research and Development Ltd. The authors wish to acknowledge technical discussions with Nilesh D. Mankame and the support of Nancy L. Johnson and Jan H. Aase, all of the Smart Materials and Structures Group at General Motors Global Research and Development, Warren, Michigan, USA.

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  1. Department of Mechanical Engineering, Technion, Haifa, 32000, Israel

    S. Vollach, D. Shilo & H. Shlagman

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  1. S. Vollach
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  2. D. Shilo
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  3. H. Shlagman
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Correspondence to S. Vollach.

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Vollach, S., Shilo, D. & Shlagman, H. Mechanical Response of Shape Memory Alloys Under a Rapid Heating Pulse - Part II. Exp Mech 56, 1465–1475 (2016). https://doi.org/10.1007/s11340-016-0172-z

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