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Updated: Oct 22, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Experimental Analysis of NiTi Alloy during Strain-Controlled Low-Cycle Fatigue
Pedro Cunha Lima1,2, Patrícia Freitas Rodrigues1, Ana Sofia Ramos1
1University of Coimbra, CEMMPRE, Department of Mechanical Engineering, 3030-790 Coimbra, Portugal.
Abstract:
The interaction between the stress-induced martensitic transformation and resistivity behavior of superelastic NiTi shape memory alloy (SMA) was studied. Strain-controlled low-cycle fatigue up to 6% was monitored by in situ electrical resistivity measurements. The experimental results show that a great motion of martensite fronts results in a significant accumulation of defects, as evidenced by transmission electron microscopy (TEM), before and after the tensile cycles. This gives rise to an overall increase of the resistivity values up to the maximum deformation. Therefore, the research suggests that shape memory alloy wire has great potential as a stress sensor inside bulk materials.
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