Abstract
The fatigue behavior of Ni-Ti springs with shape memory effect, applied in the activation of flow valves was studied. Employing an unconventional method, the structural and phenomenological aspects of the shape memory effect were analyzed. The Ni-Ti alloy was characterized by: Differential Scanning Calorimetry, Optical Microscopy, Scanning Electron Microscopy and Eletron Dispersion Spectroscopy. Subsequently, for the analysis of structural and functional fatigue in shape memory, sensors/actuators in the form of helical springs were submitted to the superelastic fatigue test. The test routine created was performed interspersing slow and fast cycles, controlling temperature, stress and deflection variables. Thus, it was possible to investigate the evolution of critical temperatures, thermoelastic deformations and thermal hysteresis, in specific stages of thermomechanical cycling, to identify a possible degradation of structural and functional properties. It was possible to verify the effectiveness of the proposed methodology in characterizing the Ni-Ti sensor/actuator under the studied conditions.
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