D. Cardone, G. Gesualdi, Univeristy of Basilicata, Potenza, Italy
Phenomenological models are often used to describe the thermomechanical behaviour of SMA. In this paper, two different phenomenological models are considered. The first model is addressed to the simulation of the thermomechanical behaviour of pre-strained SMA wires. The second model is aimed at the description of the high-frequency cyclic behaviour of superelastic SMA wires. The model parameters have been calibrated based on the results of experimental tests on NiTi SMA wires.
Four different types of tests have been performed, namely: (i) loading-unloading tests at different air temperatures, (ii) tests under temperature control while keeping the tension constant, (iii) tests under temperature control while keeping the strain constant and (iv) cyclic tests at high strain rate.
In the paper, the results of the experimental tests are first presented and then used to calibrate the model parameters. Comparisons between numerical simulations and experimental results confirm the accuracy of the two phenomenological models.
Summary: In the paper two phenomenological models for the description of the thermomechanical behaviour of SMA are examined. The model parameters are calibrated based on the results of different experimental tests, including: (i) loading-unloading tests at different air temperatures, (ii) tests under temperature control while keeping costant either tension or strain and (iv) cyclic tests at high strain rate. Comparisons between numerical simulations and experimental results confirm the accuracy of the models.
