Experimental Investigation of the Impact of Loading Conditions on the Change in Thin NiTi Wire Resistance during Cyclic Stretching

This paper presents the results of an experimental study designed to evaluate the effect of repeated stretching cycles on the electrical resistance change in a NiTi alloy wire. In particular, tests were carried out to determine the effect of the type of loading on resistance change in the investigat...

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Bibliographic Details
Published in:Materials 2024-09, Vol.17 (18), p.4577
Main Authors: Hartwich, Jonasz, Duda, Sławomir, Sławski, Sebastian, Kciuk, Marek, Woźniak, Anna, Gembalczyk, Grzegorz
Format: Article
Language:English
Subjects:
Alloys
Analysis
Chemical elements
Crystal structure
Cyclic loads
Deformation
Electrical resistance
Elongated structure
Impact resistance
Intermetallic compounds
Load resistance
Microstructure
Nickel base alloys
Nickel titanides
Phase transitions
Sensors
Shape memory alloys
Software
Strain gauges
Stretching
Temperature
Test stands
Titanium alloys
Wire
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Summary:This paper presents the results of an experimental study designed to evaluate the effect of repeated stretching cycles on the electrical resistance change in a NiTi alloy wire. In particular, tests were carried out to determine the effect of the type of loading on resistance change in the investigated wires. Wires with a diameter of 100 μm were used in the research. The experiment was carried out on a dedicated test stand designed for this purpose. During the test, the samples were subjected to 40 identical tensile cycles. The electrical resistance, sample elongation, and tensile force during successive stretching cycles were measured. The conducted research demonstrated the impact of elongation and reorientation of the structure on the resistance change in NiTi alloy thin wires. The research included a comparison of the effect of two different types of loading on the electrical resistance change in the sample. During cyclic stretching of a NiTi alloy sample with constant displacement, a decrease in electrical resistance was observed after each successive stretching cycle. Alternatively, when stretching with a constant force, the value of electrical resistance increased. In both types of loads, the greatest change in resistance value was observed at the initial cycles.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17184577