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Article

Assessment of SMA Electrical Resistance Change during Cyclic Stretching with Small Elongation

1
Department of Theoretical and Applied Mechanics, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
2
Department of Mechatronics, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Mirosław Pajor, Sławomir Duda and Maciej Majewski
Sensors 2021, 21(20), 6804; https://doi.org/10.3390/s21206804
Received: 3 September 2021 / Revised: 5 October 2021 / Accepted: 11 October 2021 / Published: 13 October 2021
(This article belongs to the Special Issue Intelligent Mechatronic Systems—Materials, Sensors and Interfaces)
In this article, changes in NiTi alloy (Flexinol) electrical resistance during cyclic stretching with small elongation were investigated. A dedicated test stand consisting of motorized vertical test stand, force gauge, and electric resistance measuring device with an accuracy of 0.006 Ω was developed. A dedicated control algorithm was developed using LabVIEW software. Changes in electrical resistance were investigated for the 0.1 mm Flexinol wire with length of 120 mm. Testing was performed in the elongation range between 0.25% and 1.5% in martensite phase. Tested samples were subjected to 30 stretching cycles with a movement speed of 10 mm/min. Obtained results show that the cyclic stretching of Flexinol wire reduces its electrical resistance with each stretching cycle. Moreover, it was noted that changes in Flexinol electrical resistance during cycling stretching depend on the assumed elongation and number of the already performed stretching cycles. The observed electrical resistance change decreases with each stretching cycle. Thus, the observed changes are greater during the first stretching cycles. For elongations exceeding 1%, the Flexinol electrical resistance in the first stretching cycle increases. In each subsequent cycle, electrical resistance decreases, as in the case of the smallest value of assumed elongation. In almost all tested cases (except in the case with 1.5% of assumed elongation), Flexinol electrical resistance after 30 stretching cycles was smaller than before the test. View Full-Text
Keywords: shape memory alloy; cyclic testing; sensor; resistance; stretching; Flexinol; control algorithm shape memory alloy; cyclic testing; sensor; resistance; stretching; Flexinol; control algorithm
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MDPI and ACS Style

Sławski, S.; Kciuk, M.; Klein, W. Assessment of SMA Electrical Resistance Change during Cyclic Stretching with Small Elongation. Sensors 2021, 21, 6804. https://doi.org/10.3390/s21206804

AMA Style

Sławski S, Kciuk M, Klein W. Assessment of SMA Electrical Resistance Change during Cyclic Stretching with Small Elongation. Sensors. 2021; 21(20):6804. https://doi.org/10.3390/s21206804

Chicago/Turabian Style

Sławski, Sebastian, Marek Kciuk, and Wojciech Klein. 2021. "Assessment of SMA Electrical Resistance Change during Cyclic Stretching with Small Elongation" Sensors 21, no. 20: 6804. https://doi.org/10.3390/s21206804

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