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

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

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 expansi...

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Autores principales: Carmine Maletta, Emanuele Sgambitterra, Fabrizio Niccoli
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2016
Materias:
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Science
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Acceso en línea:https://doaj.org/article/c8be305aff4b43d3ae6980f7cd8b02c2
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spelling oai:doaj.org-article:c8be305aff4b43d3ae6980f7cd8b02c22021-12-02T11:40:15ZTemperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model10.1038/s41598-016-0024-12045-2322https://doaj.org/article/c8be305aff4b43d3ae6980f7cd8b02c22016-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-016-0024-1https://doaj.org/toc/2045-2322Abstract 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.Carmine MalettaEmanuele SgambitterraFabrizio NiccoliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 6, Iss 1, Pp 1-11 (2016)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Carmine Maletta
Emanuele Sgambitterra
Fabrizio Niccoli
Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
description 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.
format article
author Carmine Maletta
Emanuele Sgambitterra
Fabrizio Niccoli
author_facet Carmine Maletta
Emanuele Sgambitterra
Fabrizio Niccoli
author_sort Carmine Maletta
title Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
title_short Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
title_full Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
title_fullStr Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
title_full_unstemmed Temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
title_sort temperature dependent fracture properties of shape memory alloys: novel findings and a comprehensive model
publisher Nature Portfolio
publishDate 2016
url https://doaj.org/article/c8be305aff4b43d3ae6980f7cd8b02c2
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AT emanuelesgambitterra temperaturedependentfracturepropertiesofshapememoryalloysnovelfindingsandacomprehensivemodel
AT fabrizioniccoli temperaturedependentfracturepropertiesofshapememoryalloysnovelfindingsandacomprehensivemodel
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