On the understanding of damping capacity in SMA: From the material thermomechanical behaviour to the structure response

Abstract

Superelastic Shape Memory Alloys (SMAs) provide a high damping capacity due to the hysteretic motion of the inter-phase boundaries during the martensitic transformation. They have demonstrated their ability to control vibrations of SMA-based Civil Engineering and Aerospace structures. In order to improve existing damping devices, characterization of SMA damping capacity is necessary, despite the lack of a standard procedure. Classical characterizations such as tensile or torsion tests on SMA samples are very attractive, the fact that they are common and simple to process. Furthermore, environment and loading conditions are quite easy to control. Different energy-based formulations have been proposed in the literature to explicitly predict SMA damping capacity from the hysteretic mechanical behaviour. The aim of this paper is to classify commonly used formulations from the literature, using a new thermomechanical vibration numerical model of a SMA beam structure. Thus, three energy-based predictions of SMA intrinsic damping ratio measured at the material scale are compared to the damping ratio measured from the free vibration signal at the SMA beam structure scale, taken as the objective reference. The formulation proposed by Piedbœuf and Gauvin provided a better match in three study-cases.

Dynamical Mechanical Analysis and Micromechanics Simulations of Spin-Crossover@Polymer Particulate Composites: Toward Soft Actuator Devices

“…We highlight that these effects are inherent properties of the SCO particles: they occur due to the sensitivity of the spin-state equilibrium to applied mechanical stress. We believe that the enhanced dissipation may be a useful asset in vibration damping applications . On the other hand, the elastic softening phenomenon results in reduced actuating performance and should be therefore more quantitatively investigated on bulk SCO samples.…”

“…We believe that the enhanced dissipation may be a useful asset in vibration damping applications. 72 On the other hand, the elastic softening phenomenon results in reduced actuating performance and should be therefore more quantitatively investigated on bulk SCO samples. Finally, this work also highlights that when SCO particles are embedded in an environment with a lower elastic modulus, the internal stresses generated at the spin transition remain too low to impact the SCO behavior sizeably.…”

Dynamic mechanical damping analysis of up/step-quenched Cu-Zn-Sn-based shape memory alloys

“…It has been reported in the literature that the high damping capacity of Cu-based shape memory alloys is attributed to their ability to dissipate energy emanating from the movement of variant interfaces [48,49]. The high damping capacity associated with the step-quenched samples of Cu-Zn-Sn-based SMAs may be linked to the marginal pinning effect of the precipitate phases and greater mobility of variant interfaces leading to high internal friction.…”

A review on shape memory alloys and their prominence in automotive technology

“…During the loading cycle, the formation and displacement of austenite-martensite interfaces is accompanied by a high level of defect production and a substantial thermo-mechanical coupling. The stress hysteresis between pseudo-elastic loading and unloading causes energy dissipation during the pseudo-elastic cycling, that is, damping (Helbert et al, 2021; Lin et al, 1993).…”