Abstract
A thermomechanical model for a shape memory alloy (SMA) wire under uniaxial loading is implemented in a finite element framework, and simulation results are compared with mechanical and infrared experimental data. The constitutive model is a one–dimensional strain-gradient continuum model of an SMA wire element, including two internal field variables, possible unstable mechanical behavior, and the relevant thermomechanical couplings resulting from latent heat effects. The model is calibrated to recent and new experiments of typical commercially available polycrystalline NiTi wire. The shape memory effect and pseudoelastic behaviors are demonstrated numerically as a function of applied displacement rate and environmental parameters, and the results compare favorably to experimental data. The model is then used to simulate a simple SMA actuator device, and its performance is assessed for different thermal boundary conditions.
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Chang, BC., Shaw, J.A. & Iadicola, M.A. Thermodynamics of Shape Memory Alloy Wire: Modeling, Experiments, and Application. Continuum Mech. Thermodyn. 18, 83–118 (2006). https://doi.org/10.1007/s00161-006-0022-9
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DOI: https://doi.org/10.1007/s00161-006-0022-9