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Maletta C, Sgambitterra E, Niccoli F. Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model. Sci Rep. 2016;6(1):17doi: 10.1038/s41598-016-0024-1.
Maletta, C., Sgambitterra, E., & Niccoli, F. (2016). Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model. Scientific reports, 6(1), 17. https://doi.org/10.1038/s41598-016-0024-1
Maletta, Carmine, et al. "Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model." Scientific reports vol. 6,1 (2016): 17. doi: https://doi.org/10.1038/s41598-016-0024-1
Maletta C, Sgambitterra E, Niccoli F. Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model. Sci Rep. 2016 Dec 21;6(1):17. doi: 10.1038/s41598-016-0024-1. PMID: 28442711; PMCID: PMC5431350.
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Sci Rep. 2016 Dec 21;6(1):17. doi: 10.1038/s41598-016-0024-1.

Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model.

Scientific reports

Carmine Maletta, Emanuele Sgambitterra, Fabrizio Niccoli

Affiliations

  1. Department of Mechanical, Energy and Management Engineering, University of Calabria, P. Bucci 44C, 87036, Rende (CS), Italy. [email protected].
  2. Department of Mechanical, Energy and Management Engineering, University of Calabria, P. Bucci 44C, 87036, Rende (CS), Italy.

PMID: 28442711 PMCID: PMC5431350 DOI: 10.1038/s41598-016-0024-1

Abstract

Temperature dependent fracture properties of NiTi-based Shape Memory Alloys (SMAs), within the pseudoelastic regime, were analyzed. In particular, the effective Stress Intensity Factor (SIF) was estimated, at different values of the testing temperature, by a fitting of the William's expansion series, based on Digital Image Correlation (DIC) measurements. It was found that temperature plays an important role on SIF and on critical fast fracture conditions. As a consequence, Linear Elastic Fracture Mechanics (LEFM) approaches are not suitable to predict fracture properties of SMAs, as they do not consider the effects of temperature. On the contrary, good agreements between DIC results and the predictions of an ad-hoc analytical model were observed. In fact, the model takes into account the whole thermo mechanical loading condition, including both mechanical load and temperature. Results revealed that crack tip stress-induced transformations do not represent a toughening effect and this is a completely novel result within the SMA community. Furthremore, it was demonstrated that the analytical model can be actually used to define a temperature independent fracture toughness parameter. Therefore, a new approach is proposed, based on the analytical model, where both mechanical load and temperature are considered as loading parameters in SIF computation.

References

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