MICROMECHANICALLY BASED CONSTITUTIVE EQUATIONS FOR SHAPE-MEMORY ACTUATORS OF RECONFIGURABLE MANUFACTURE SYSTEMS

摘要

The main purpose of this work is to develop a constitutive model for shape-memory devices, according to the phase transformation from austenite to martensite and the relation with the stress strain curve. First experimental testing is made to determine the mechanical behavior of the NiTi at several temperatures, and then a constitutive model is found according to the phase transformation behavior. The results show the microstructure evolution and its relation with the stress-strain curve. To conclude, a new constitutive model for the NiTi alloy has been developed which permits further analysis or simulation by finite element, which will be used in actuators for reconfigurable machines for flexible manufacture.