This paper describes numerical and experimental results of a Shape Memory Alloy (SMA) plate considering electromagneto-thermo-structural coupling. All-round Shape Memory Effect (ARSME) is discriminated from the one-way shape memory effect which usually occurs in this alloy. It shows two shape memories. The Ti-51 at%Ni alloy plates we used are heat-treated to have the all-round shape memories. The plate remembers arc shape at high temperature and is flat at room temperature using the rhombohedral transformation which occurs between a rhombohedral phase and an austenite one. This rhombohedral transformation shows smaller hysteresis, quicker response, higher fatigue strength, etc. in comparison with the matensitic transformation. We performed an electromagnetically induced heating experiment for this ARSME plate and measured its deformation and temperature rise. Measured deformation and temperature rise of the ARSME were predicted based on the FEM by using 3 D eddy current simulation, temperature analysis considering a latent heat due to the transformation, and structural analysis considering shape change. The numerical results almost agreed with experimental ones. Both Ti and Ni have good bio-comaptibility. Thus TiNi SMA can be applicable for a human body and this non-contact heating method is desirable to generate heat and actuation. The methods developed here could be used as an optimization method of artificial SMA valves in a human body.
|ジャーナル||Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C|
|出版ステータス||Published - 1998|
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering