Experimental analysis of niti alloy during strain-controlled low-cycle fatigue

Pedro Cunha Lima, Patrícia Freitas Rodrigues, Ana Sofia Ramos, José D. M. da Costa, Francisco Manuel Braz Fernandes, Maria Teresa Freire Vieira

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number4455
JournalMaterials
Volume14
Issue number16
DOIs
Publication statusPublished - 9 Aug 2021

Keywords

  • NiTi
  • Resistivity
  • Shape memory alloy
  • Stress-induced martensite

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