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Stiffness changes in thermodynamic Nitinol with increasing temperature.

G Andreasen, H Heilman, D Krell

    The Angle Orthodontist
    |April 1, 1985
    PubMed
    Summary
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    This study measured the physical properties of Nitinol A-138, a thermodynamic alloy. Increased temperature enhances its working range, with stiffness rising as yield strength decreases.

    Area of Science:

    • Materials Science
    • Metallurgical Engineering

    Background:

    • Nitinol alloys are known for their unique thermodynamic properties.
    • Understanding alloy behavior across temperature ranges is crucial for material selection.

    Purpose of the Study:

    • To measure and describe the physical properties of Nitinol A-138.
    • To determine the working range of Nitinol A-138 between room and body temperatures.

    Main Methods:

    • Measurement of stiffness, flexure yield strength, and permanent deformation.
    • Testing conducted at temperature intervals between 75°F and 100°F.

    Main Results:

    • Nitinol A-138's working range correlates with temperature increases.
    • Stiffness of the .017'' round A-138 Nitinol wire increases as yield point decreases.

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  • Yield points in the loading cycle dropped from 36° to 25° angular deflection between 75°F and 100°F.

    • Conclusions:

    • The temperature range of 75°F to 100°F is critical for Nitinol A-138's performance.
    • Material properties like stiffness and yield strength are temperature-dependent.
    • Further research may explore applications utilizing these temperature-dependent properties.