Non linear dynamical behaviour of shape memory alloys and optimisation of damping effect. Study of a passive damper
Résumé
Shape Memory Alloys (SMAs) are good candidates for being used as passive dampers, strain sensors, stiffness or shape drivers. In order to develop the use of these alloys in structural vibration control, we present in this paper how the implementation (Thiebaud & al. (2007)) of a phenomenological model based on the Rl model (Raniecki & al. (1992)) in a finite element code is used. This implementation permits us to simulate internal loops in order to characterize the stiffness and the damping effect by an Equivalent Complex Young's Modulus approach under many static strain offsets. The results confirmed a dynamic mechanical analysis leaded on a SMA wire sample and, clearly show us the influence of an initial static strain offset and the amplitude of vibration on the damping effect and the stiffness.
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