Development of simulation tools for analyzing the actuation of smart materials
In order to predict the hinge-moments produced by smart material actuation as well as the strength of smart material components, a reliable material model needs to be developed for each smart material. This material model can then be used in the finite element analysis of structures containing smart actuators. These could either be embedded actuators or linkages made of smart material. In this paper we show a developed thermo-mechanical model that can be used for modeling NiTi Shape Memory Alloy material. The developed constitutive model can be utilized to analyze simple and complex structures/shapes. It was developed based on the approach by Liang and Rogers. The phase transformation occurring in the SMA microstructure and the temperature variation are treated as internal variables for this model. The simulation results are presented and analyzed. Copyright © 2011 MS&T'11®.