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An experimental investigation of the superelastic fatigue of NiTi SMA wires

  • Allysson Daniel de Oliveira Ramos
  • Carlos José de Araújo
  • Henrique Martinni Ramos de Oliveira
  • Gabriel Almeida Macêdo
  • Antonio Gilson Barbosa de Lima
Technical Paper
  • 116 Downloads

Abstract

Nickel–titanium shape memory alloys (NiTi SMA) working in superelastic regime have been applied in several fields, such as health (medicine and dentistry) and engineering, in a static or dynamic way. The aim of this paper is to study the behavior of these smart metals when subjected to dynamic mechanical stresses (fatigue). Cyclic stress-controlled tensile tests were performed to evaluate the functional and structural superelastic fatigue properties of NiTi SMA wires. The functional parameters were defined as energy dissipation, transformation stresses, residual strain, and superelastic strain, for peak stresses between 500 and 800 MPa, at frequencies of 1, 2, and 3 Hz. These frequencies were determined after a preliminary evaluation of self-heating of the NiTi wires. The number of cycles until failure (Nf) was plotted as a function of peak stresses (S) in an SNf fatigue curve, for each studied frequency. It was verified that both frequency and peak stress affected the functional behavior of the NiTi wires. However, the fatigue life was between 5.0 × 103 and 1.6 × 104 cycles, with a faster degradation in this range as higher is the applied peak stress, irrespective of the loading frequency.

Keywords

NiTi SMA wires Superelasticity Functional fatigue Structural fatigue Stress-controlled tensile tests 

Notes

Acknowledgements

The authors thank the National Council for Scientific and Technological Development (CNPq) Brazilian office for sponsoring the following projects: National Institute of Science and Technology for Smart Structures in Engineering (INCT-EIE, Grant Number 574001/2008-5), Universal 01/2016 (Grant Number 401128/2016-4), CT-Aeroespacial 22/2013 (Grant Number 402082/2013-3), and PQ-1D (Grant Number 304658/2014-6).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  • Allysson Daniel de Oliveira Ramos
    • 1
  • Carlos José de Araújo
    • 1
  • Henrique Martinni Ramos de Oliveira
    • 1
  • Gabriel Almeida Macêdo
    • 1
  • Antonio Gilson Barbosa de Lima
    • 1
  1. 1.Department of Mechanical EngineeringFederal University of Campina GrandeCampina GrandeBrazil

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