Modeling dynamics of multilayered SMA actuators

Roderick V. N. Melnik; Anthony J. Roberts

doi:10.1117/12.420849

21 March 2001 Modeling dynamics of multilayered SMA actuators

Roderick V. N. Melnik, Anthony J. Roberts

Proceedings Volume 4235, Smart Structures and Devices; (2001) https://doi.org/10.1117/12.420849
Event: Smart Materials and MEMS, 2000, Melbourne, Australia

Abstract

Since the phase change in SMA-based devices such as actuators is accompanied by a significant heat exchange with the surroundings, different concepts to heat/cool SMAs have been proposed in the literature. Most of these concepts require the analysis of a multilayered (e.g., "sandwich"-type) structure where the SMA layer is placed between layers with another material. In this paper we propose a mathematical model and an efficient numerical method for this analysis. Although our approach can be applied to a wide range of different designs of multilayered actuators, the basic idea of the model construction is explained in this paper for a specific design based on the introduction of semiconductor "heat pump" modules into the device and the Peltier effect for the heat exchange. The dynamics of thermomechanical fields is studied with a coupled system of PDEs based on conservation laws. The system, supplemented by constitutive relationships in the Falk form, is reduced to a differential-algebraic (DA) model and solved with an effective DA solver developed in our previous works. Numerical results on thermomechanical behaviour of SMA components in multilayered actuators are presented.

Citation Download Citation

Roderick V. N. Melnik and Anthony J. Roberts "Modeling dynamics of multilayered SMA actuators", Proc. SPIE 4235, Smart Structures and Devices, (21 March 2001); https://doi.org/10.1117/12.420849

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