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Study of Unrecovered Strain and Critical Stresses in One-Way Shape Memory Nitinol

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Abstract

Unique thermomechanical properties of Nitinol known as shape memory and superelasticity make it applicable for different fields such as biomedical, structural, and aerospace engineering. These unique properties are due to the comparatively large recoverable strain, which is being produced in a martensitic phase transformation. However, under certain ranges of stresses and temperatures, Nitinol wires exhibit unrecovered strain. For cyclic applications, it is important to understand the strain behavior of Nitinol wires. In this study, the unrecovered strain of different Nitinol wire diameters was investigated using constant stress experiment. Uniaxial tensile test has been also performed to find the range of critical stresses. It was observed that the unrecovered strain produced in the first loading-unloading cycle affects the total strain in the subsequent cycles. Moreover, a critical range of stress was found beyond which the unrecovered strain was negligible while the wires heated up to the range of 70-80°C, depending on the wire diameters. The unrecovered strain of wire diameters of 0.19 mm and less was found to be sensitive to the critical stress. On the other hand, for wire diameters bigger than 0.19 mm this connection between the unrecovered strain and the critical stress was not observed for the same range of heating temperature.

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Abbreviations

A s :

Austenite start temperature (°C)

A f :

Austenite finish temperature (°C)

M s :

Martensite start temperature (°C)

M f :

Martensite finish temperature (°C)

σMs :

Martensite starting stress in superelastic behavior (MPa)

σMf :

Martensite finishing stress in superelastic behavior (MPa)

σAs :

Austenite starting stress in superelastic behavior (MPa)

σAf :

Austenite finishing stress in superelastic behavior (MPa)

σcrsC :

Starting critical stress achieved from constant stress experiment (MPa)

σcrfC :

Finishing critical stress achieved from constant stress experiment (MPa)

σcrsT :

Starting critical stress achieved from Uniaxial Tensile test (MPa)

σcrfT :

Finishing critical stress achieved from Uniaxial Tensile test (MPa)

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Acknowledgments

The authors would like to acknowledge the contributions of Parameswara Rao Chinnam, PhD student of the Chemistry Department and Sean Devlin, PhD student of the Bioengineering Department at Temple University. This work is supported by the Department of Defense CDMRP Prostate Cancer Research Program (GRANT # W81XWH-11-1-0397/98/99).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Temple University, 1947 N. 12th street, Philadelphia, PA, 19122, USA

    Mohammad Honarvar, Naresh V. Datla, Bardia Konh & Parsaoran Hutapea

  2. Department of Radiation Oncology, University Hospitals, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH, 44106, USA

    Tarun K. Podder

  3. Department of Radiation Oncology, Thomas Jefferson University, 111 S. 11th street, Philadelphia, PA, 19107, USA

    Adam P. Dicker & Yan Yu

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  1. Mohammad Honarvar
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  2. Naresh V. Datla
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Correspondence to Parsaoran Hutapea.

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Honarvar, M., Datla, N.V., Konh, B. et al. Study of Unrecovered Strain and Critical Stresses in One-Way Shape Memory Nitinol. J. of Materi Eng and Perform 23, 2885–2893 (2014). https://doi.org/10.1007/s11665-014-1077-6

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  • DOI: https://doi.org/10.1007/s11665-014-1077-6

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