A Study of the Effect of Diameter on the Fatigue Properties of Niti Wire

  • Audrey Fasching
  • Published 2008

Abstract

It is a generally held belief that controlled strain fatigue life is independent of wire diameter. This has led to the widespread use of general S-N curves for Engineering metals. Independence of wire diameter on fatigue life may not hold true for Nitinol. If so care must be used when applying generic Nitinol S-N curves to product design. To provide a more comprehensive understanding of this issue, a comparison study was conducted on the fatigue properties of various diameters of NiTi (Ti-55.8/55.9 wt%Ni) wire drawn from the same starting material. S-N curves were generated for various diameters. The wire diameter reduction from 0.030” to 0.010” increased the 0.8% strain 80k cycle survival rate from 35% to 96% as shown in Figure 3. For the scope of this study, all factors that may have an effect on fatigue life except for wire diameter were held constant.

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Cite this paper

@inproceedings{Fasching2008ASO, title={A Study of the Effect of Diameter on the Fatigue Properties of Niti Wire}, author={Audrey Fasching}, year={2008} }