Numerical simulation of superelastic shape memory alloys subjected to dynamicloads

Abstract

Superelasticity, a unique property of shape memory alloys (SMAs), allows the material torecover after withstanding large deformations. This recovery takes place without anyresidual strains, while dissipating a considerable amount of energy. This property makesSMAs particularly suitable for applications in vibration control devices. Numerical models,calibrated with experimental laboratory tests from the literature, are used to investigatethe dynamic response of three vibration control devices, built up of austenitic superelasticwires. The energy dissipation and re-centering capabilities, important featuresof these devices, are clearly illustrated by the numerical tests. Their sensitivityto ambient temperature and strain rate is also addressed. Finally, one of thesedevices is tested as a seismic passive vibration control system in a simplifiednumerical model of a railway viaduct, subjected to different ground accelerations.