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Stiffness changes in thermodynamic Nitinol with increasing temperature.
The Angle Orthodontist
|April 1, 1985
Summary
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.
- 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.