Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Combining Shape Memory Alloy Wire Actuators With Permanent Magnets for a Multi-Stable Smart Structure
Submission Author:
Thiago de Paula Sales , SP
Co-Authors:
Domingos Rade, Daniel Inman, Thiago de Paula Sales
Presenter: Thiago de Paula Sales
doi://10.26678/ABCM.COBEM2017.COB17-1416
Abstract
Shape memory alloy (SMA) materials have received attention in recent years as they can be used as thermo-mechanical actuators that have high energetic density and large recoverable strains. SMA wires can be embedded in other components, resulting in compact designs, while also being able to act as load bearing components, thus allowing for weight reduction. Nevertheless, SMAs suffer from low energy conversion efficiency, because of their thermo-mechanical nature. To mitigate this issue, multi-stable arrangements can be adopted, in which actuators benefit from larger off-times, while the system is still capable of maintaining its configuration with no additional energy expense. Following this reasoning, the simultaneous use of SMA wire actuators and permanent magnets is investigated for achieving multi-stable smart structures. A cantilever beam is considered, to which antagonistic SMA wires and permanent magnets are attached to. A numerical modeling procedure is developed accounting for the thermo-mechanical coupling involved in the shape memory effect, the nonlinear electromagnetic interactions, and contact forces. Numerical simulations are performed, and experimental data is used to validate the adopted modeling strategies. Results demonstrate the efficiency of the combination between SMAs and permanent magnets in achieving multi-stable configurations in the context of smart structures.
Keywords
Shape Memory Alloys, permanent magnets, multi-stability, smart materials
