Abstract
In this paper, superelastic shape memory alloy-based springs are modeled by using a rate dependent Preisach model, which is an extended version of the conventional Preisach model. The proposed model has extended terms which depend on the input rate as well as the output rate. The former terms represent the perturbation of restoring force due to the change of alloy's temperature induced by the phase transformation, while the latter represents the relaxation process of first-order due to the heat transfer. The proposed model is then discretized, and the parameters in the model are identified by solving a quadratic programming problem. The results of the preliminary experimental study show the capacity of the proposed model to represent the rate dependency of the restoring force properties of superelastic shape memory alloys.
