An always increasing knowledge on material properties as well as a progressively more sophisticated production technology make Shape Memory Alloys (SMA)

extremely interesting for the industrial world.At the same time, SMA devices are typically characterized by complex multi-axial stress states as well as non-homogeneous and non-isothermal conditions both in space and time.

This aspect suggests the finite element method as a useful tool to help and improve application design and realization. With this aim, we focus on three-dimensional macroscopic thermo-mechanicalmodeling able to reproduce the most significant SMA features, such as pseudo elasticity and shape memory effect. Moreover, for the proposed models it is possible the development of a

time-discrete solution algorithm, which is effective and robust.

We verify the computational tool ability to simulate complex pointwise stress-strain histories as well as realistic thermo-mechanical boundary value problems.

As an example we may consider coronaric stents, which are small metal tubes, inserted into an artery at the site of a narrowing to act as an internal scaffolding or support to the blood vessel. Other simulations and details can be found on the web page

http://www.unipv.it/dms/auricchio/cofin\₀2/home.htm

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1. A phenomenological 1D model describing main and secondary effects of stress-induced solid phase transformations.