形状记忆合金, 致动器, 热力学模型, 对流传热

Aimed at the electric-thermal heating difficulties of thick SMA wire actuators for their small resistance, a new type of composite electric-thermal heating method by winding the enameled wire around the SMA wire was presented. Using the lumped parameter method and simplifying characterization of the complex heat exchange process between the enameled wire and the SMA wire to an equivalent thermal conductivity, a thermodynamic model of this electric-thermal heating process was built. And comparative analysis between the numerical solution of this theoretical model and the experimental results demonstrates that this thermodynamic model can describe accurately the heating and cooling process of this electric-thermal heating method. Further experiments show that this electric-thermal heating method can increase greatly the thermal heating velocities of thick SMA wire actuators.

shape memory alloy（SMA）,  , actuator,  , thermodynamic model,  , convection heat transfer