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Thermo-mechanical properties of snake-like NiTi wires and their use in miniature devices

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Abstract

In this study, we present the thermo-mechanical characterization of snake-like shape memory alloy (SMA) NiTi wires. Several samples were formed at different thermal treatments and analyzed through calorimetry and thermo-mechanical tests. It was found that for small deformations the snake-like SMA wire behaves as a quasi-elastic material, presenting the flag-shape pseudoelastic behavior at high thermal treatment temperatures. The mechanical performance seems to depend basically on the snake geometry instead on the thermal treatment; only for the 773 K treatment sample the performance rapidly gets worse. Stabilization is reached in few cycles. After the thermo-mechanical characterization, we studied the performance of the snake-like SMA wire mounted in a miniature rotational actuator, suggesting an innovative application in the actuator field.

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Authors and Affiliations

  1. Consiglio Nazionale delle Ricerche – Istituto per l’Energetica e le Interfasi (CNR-IENI), U.O.S. di Lecco, Corso Promessi Sposi 29, 23900, Lecco, Italy

    Adelaide Nespoli, Elena Villa & Stefano Besseghini

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  1. Adelaide Nespoli
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  2. Elena Villa
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  3. Stefano Besseghini
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Correspondence to Adelaide Nespoli.

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Nespoli, A., Villa, E. & Besseghini, S. Thermo-mechanical properties of snake-like NiTi wires and their use in miniature devices. J Therm Anal Calorim 109, 39–47 (2012). https://doi.org/10.1007/s10973-011-1324-0

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  • DOI: https://doi.org/10.1007/s10973-011-1324-0

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