PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 2283–2290

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo In this work, a model able to describe the microstructure evolution related to the mechanical behaviour of a SMA has been proposed. Results of FEM simulations have been compared with experimental ones both in terms of microstructure modifications and mechanical behaviour. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Type your keywords here, separated by semicolons ; 1. Introduction The Shape Memory Alloys (SMAs) are a wide class of material characterized by the property of recovering the initial shape under determinate conditions. As stated by Bellini and Natali (2019), the memory property of the SMAs is due to the ability to change the lattice structure without any recrystallization. It means that each atom belongs to the Abstract Shape memory alloys (SMAs) are more and more used in many fields of mechanics and medicine. The reason for the success is t e ability t ecover the initial shape also after high values of de ormation. Duri g the eformation, t SMAs are abl to hange structure from an init al one, oft n named as austenite, t a final one, amed martensite. This transformation takes place at low empera , and no recrystallization occurs, but the bulk of gra s is i terested by structure changing. For that, this phenomenon cannot be qu lified as a tradit onal stru ture transformati n, but it i much more correct o talk about the transition of phase. The austenite-martensite tr nsition is reve sible, allowing a perfect recovery of the shape shown in the a stenite phase. In this work, a mod l able o desc ibe the microstructure evolu ion related to t mechanical behaviour of a SMA has been proposed. Results f FEM simulati ns have be n compared with experim ntal ones both in terms of mic structure modificati ns and m chanical behaviour. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integri y Soci ty (ESIS) ExC Keywords: Type your keywords here, separated by semicolons ; 1. Introduction The Shape Memory Alloys (SMAs) are a wide class of material characterized by the property of recovering the initial shape und r determinate conditions. As stat d by Bellini and Nat li (2019), the m mory property of the SMAs s due to th ability to change the latt ce structure without any recrystallization. It means that each atom belongs to the 1st Virtual European Conference on Fracture An integrated model to predict the microstructure evolution and the mechanical behaviour of a two-phases pseudo-elastic SMA Costanzo Bellini a , Filippo Berto b , Vittorio Di Cocco a *, Francesco Iacoviello a a University of Cassino and Southern Lazio, via G. Di Biasio 43, 03043 Cassino, Italy b NTNU- Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7491 Trondheim, Norway Abstract Shape memory alloys (SMAs) are more and more used in many fields of mechanics and medicine. The reason for the success is the ability to recover the initial shape also after high values of deformation. During the deformation, the SMAs are able to change the structure from an initial one, often named as austenite, to a final one, named martensite. This transformation takes place at low temperature, and no recrystallization occurs, but the bulk of grains is interested by a structure changing. For that, this phenomenon cannot be qualified as a traditional structure transformation, but it is much more correct to talk about the transition of phase. The austenite-martensite transition is reversible, allowing a perfect recovery of the shape shown in the austenite phase. 1st Virtual European Conference on Fracture An integrated model to predict the microstructure evolution and the mechanical behaviour of a two-phases pseudo-elastic SMA Costanzo Bellini a , Filippo Berto b , Vittorio Di Cocco a *, Francesco Iacoviello a a University of Cassino and Southern Lazio, via G. Di Biasio 43, 03043 Cassino, Italy b NTNU- Norwegian University of Scie ce and Technol gy, Richard Birkelands vei 2b, 7491 Trondheim, Norway

* Corresponding author. Tel.: +39-0776-299-4334; fax: +39-0776-299-3781. E-mail address: v.dicocco@unicas.it * Corresponding author. Tel.: +39-0776-299-4334; fax: +39-0776-299-3781. E-mail ad ress: v.dicocco@unicas.it

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of t European Structural Integrity Society (ESIS) ExC

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.074