A new phase transformation constitutive model of shape memory alloys

Abstract

As the phase transformation temperatures influence the phase transformation behaviors of shape memory alloys, a constitutive model which can predict their phase transformation behaviors is necessary. In this study, a series of DSC tests is conducted to determine the phase transformation temperatures of shape memory alloy, and a new constitutive model, based on the DSC results, is suggested to predict the phase transformation behavior. Such a constitutive model is formulated on the phase transformation peak temperatures as well as the phase transformation starting and finishing temperatures. Numerical calculations are also conducted in order to verify the capability of the constitutive model through comparing the results with Liang's model. According to the results, the suggested model can be used to predict the phase transformation behavior more precisely due to the fact that it contains the phase transformation peak temperatures as well as the phase transformation starting and finishing temperatures.