Stress induced martensite at the crack tip in NiTi alloys during fatigue loading

E. Sgambitterra; L. Bruno; C. Maletta

doi:10.3221/IGF-ESIS.30.22

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Published Sep 10, 2014

DOI https://doi.org/10.3221/IGF-ESIS.30.22

E. Sgambitterra

Dept. of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy.

L. Bruno

Dept. of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy.

C. Maletta

Dept. of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy.

Abstract

Crack tip stress-induced phase transformation mechanisms in nickel-titanium alloys (NiTi) were analyzed by Digital Image Correlation (DIC), under fatigue loads. In particular, Single Edge Crack (SEC) specimens, obtained from a commercial pseudoelastic NiTi sheet, and an ad-hoc experimental setup were used, for direct measurements of the near crack tip displacement field by the DIC technique. Furthermore, a fitting procedure was developed to calculate the mode I Stress Intensity Factor (SIF), starting from the measured displacement field. Finally, cyclic tensile tests were performed at different operating temperature, in the range 298-338 K, and the evolution of the SIF was studied, which revealed a marked temperature dependence.

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Issue

Vol. 8 No. 30 (2014): October 2014

Section

Miscellanea

How to Cite

Sgambitterra, E., Bruno, L., & Maletta, C. (2014). Stress induced martensite at the crack tip in NiTi alloys during fatigue loading. Frattura Ed Integrità Strutturale, 8(30), pages 167–173. https://doi.org/10.3221/IGF-ESIS.30.22

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