P. Malecot, M. Collet, E. Foltête, FEMTO-ST, 25000 Besançon, France; C. Lexcellent, Université de Franche-Comté, Besancon, France
The rational use of Shape Memory Alloys as actuators or dampers requires a rigorous approach namely: (i) Thorough knowledge of the microstructure evolution, submitted to a stress-state, demands for a good micro-macro integration, (ii) Multi-axial mechanical tests under proportional and non-proportional loadings, (iii) A macroscopic phenomenological modelling of the Representative Elementary Volume (REV), (iv) A numerical implementation of the model into a finite element code, (v) Validation of the results through the correlation on structural tests. This presentation will elucidate on all of these topical areas for a more complete description of the deformation mechanics of this unusual material.
Summary: Shape Memory Alloys (SMA) are good candidates for being integrated in composite laminates where they can be used as passive dampers, strain sensors, stiffness or shape drivers. In order to improve the SMA modeling and develop the use of these alloys in structural vibration control, better understandings of cyclic behavior and thermal dissipation are needed.
In this way experimental datas and a 3D modeling of SMA cyclic behavior are presented. Furthermore, in order to describe the stiffness and damping variations during the cycling an equivalent Young Modulus is employed. At last an experimental device using wavelet transform is proposed in order to realize dynamic characterization of SMA wires.
