An enhanced SMA phenomenological model: II. The experimental study

Abstract

In an earlier study, using an SMA-actuated robotic arm, the authors showed that the existing phenomenological models are not able to predict the behavior of the material under certain conditions. There, it was shown that such cases most often occur when the temperature and stress of the SMA wire change simultaneously. In this part, the existing model discrepancies are further studied experimentally using a dead weight, which is actuated by an SMA wire. Subsequently, an enhanced phenomenological model is developed. The enhanced model is able to predict the behavior of SMAs under complex thermomechanical loadings.