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E. Sgambitterra L. Bruno C. Maletta

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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    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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