28 March 2012 Phenomenological modeling of induced transformation anisotropy in shape memory alloy actuators
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Abstract
This paper considers new extensions to a three-dimensional constitutive model originally developed by Lagoudas and co-workers. The proposed model accurately and robustly captures the highly anisotropic transformation strain generation and recovery observed in actuator components that have been subjected to common material processing and training methods. A constant back stress tensor is introduced into the model, which is implemented in an exact form for simple tension/torsion loading as well as into a commercial finite element code to perform a 3-D analysis of a Shape Memory Alloy (SMA) torque tube actuator subjected to different loading schemes. Numerical correlations between predicted and available experimental results demonstrate the accuracy of the model.
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Darren J. Hartl, Alexandros Solomou, Dimitris C. Lagoudas, Dimitris Saravanos, "Phenomenological modeling of induced transformation anisotropy in shape memory alloy actuators", Proc. SPIE 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012, 83421M (28 March 2012); doi: 10.1117/12.915972; https://doi.org/10.1117/12.915972
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