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Analytical modeling of stress-induced martensitic transformation in the crack tip region of nickel–titanium alloys / Carmine Maletta in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 92–101 Titre : Analytical modeling of stress-induced martensitic transformation in the crack tip region of nickel–titanium alloys Type de document : texte imprimé Auteurs : Carmine Maletta, Auteur ; Franco Furgiuele, Auteur Année de publication : 2010 Article en page(s) : pp. 92–101 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Shape  memory  alloys  (SMAs)  Fracture  Martensitic  phase  transformation  Analytical  methods Résumé : A novel analytical method, which predicts the extent of the stress-induced martensitic transformation (SIM) in the crack tip vicinity of nickel–titanium (NiTi)-based shape memory alloys, as well as describing the stress distribution in both transformed and untransformed regions, is presented. The method has been validated by comparisons with results from finite-element simulations with good agreement. Furthermore, the method has been used to analyze the effects of various thermomechanical parameters on the extent of the transformation region near the crack tip. Finally, the effects of several thermomechanical loading conditions, in terms of both applied stress and temperature, on the crack tip transformation behavior have been analyzed. The results highlight a marked effect of temperature on the extent of the transformation region and, consequently, on the crack tip stress distribution. As a consequence, temperature plays a role in the fracture process of NiTi alloys. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005837 [article] Analytical modeling of stress-induced martensitic transformation in the crack tip region of nickel–titanium alloys [texte imprimé] / Carmine Maletta, Auteur ; Franco Furgiuele, Auteur . - 2010 . - pp. 92–101. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 92–101 Mots-clés : Shape  memory  alloys  (SMAs)  Fracture  Martensitic  phase  transformation  Analytical  methods Résumé : A novel analytical method, which predicts the extent of the stress-induced martensitic transformation (SIM) in the crack tip vicinity of nickel–titanium (NiTi)-based shape memory alloys, as well as describing the stress distribution in both transformed and untransformed regions, is presented. The method has been validated by comparisons with results from finite-element simulations with good agreement. Furthermore, the method has been used to analyze the effects of various thermomechanical parameters on the extent of the transformation region near the crack tip. Finally, the effects of several thermomechanical loading conditions, in terms of both applied stress and temperature, on the crack tip transformation behavior have been analyzed. The results highlight a marked effect of temperature on the extent of the transformation region and, consequently, on the crack tip stress distribution. As a consequence, temperature plays a role in the fracture process of NiTi alloys. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005837