Investigation of crystal structures of one-way shape memory Nitinol wire actuators for active steerable needle

Mohammad Honarvar; Bardia Konh; Parsaoran Hutapea

doi:10.1117/12.2084352

1 April 2015 Investigation of crystal structures of one-way shape memory Nitinol wire actuators for active steerable needle

Mohammad Honarvar, Bardia Konh, Parsaoran Hutapea

Author Affiliations +

Proceedings Volume 9432, Behavior and Mechanics of Multifunctional Materials and Composites 2015; 94320L (2015) https://doi.org/10.1117/12.2084352
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

Abstract

Due to its outstanding properties of Nitinol, known as shape memory and superelasticity, Nitinol wires have been used as actuators in many medical devices. For the medical applications, it is critical to have a consistent strain response of Nitinol wires. This work focuses on studying the effect of parameters such as biased stress, maximum temperature, and wire diameters that influence the strain response of Nitinol wires. Specifically, Nitinol phase transformations were studied from microstructural point of view. The crystal structures of one-way shape memory Nitinol wires of various diameters under different thermomechanical loading conditions were studied using X-Ray Diffraction (XRD) method. The location and intensity of characteristic peaks were determined prior and after the thermomechanical loading cycles. It was observed that Nitinol wires of diameters less than 0.19 mm exhibit unrecovered strain while heated to the range of 70ºC to 80ºC in a thermal cycle, whereas no unrecovered strains were found in larger wires. The observation was supported by the XRD patterns where the formation of R-phase crystal structure was showed in wire diameters less than 0.19 mm at room temperature.

Citation Download Citation

Mohammad Honarvar, Bardia Konh, and Parsaoran Hutapea "Investigation of crystal structures of one-way shape memory Nitinol wire actuators for active steerable needle", Proc. SPIE 9432, Behavior and Mechanics of Multifunctional Materials and Composites 2015, 94320L (1 April 2015); https://doi.org/10.1117/12.2084352

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