MODELING OF THE 2-WAY SHAPE-MEMORY EFFECT (REPRINTED FROM PHILOSOPHICAL MAGAZINE A, VOL 65, PG 1199-1215, 1992)

After detailed analyses of the microstructural mechanism and training methods of the two-way shape memory effect, a further refinement of th e transformation kinetic expressions for shape memory alloys (SMAs) is derived. A one-dimensional thermomechanical constitutive model for th e two-way effect which undergoes thermoelastic martensitic transformat ion and its reverse transformation is presented based on the one-way e ffect model of Liang and Rogers. This model reflects the essence of SM As in avery simple form and therefore is easy to use in engineering de sign. It is revealed that the material parameters required by this mod el can be calculated or measured using standard material testing appar atus. The computer simulation results are in agreement with the experi mental data that has been published in the open literature. It is demo nstrated that the theory developed can quantitatively predict and desc ribe the behaviour of SMAs and be imposed on the two-way shape memory effect.