A PHENOMENOLOGICAL 3-DIMENSIONAL MODEL FOR PSEUDOELASTIC BEHAVIOR OF SHAPE-MEMORY ALLOYS

An unified viscoplastic model with internal kinematic variables is use d to improve the description of the uniaxial and proportional loadings performed in the pseudoelastic range of shape memory alloys. There is a good agreement between experimental data and simulations. Moreover, this constitutive set of equations is efficient for the description o f internal loops and the isothermal cyclic loading which constitutes a n important training process. In the future, some progress must be per formed to take into account non proportional paths and anisothermal th ermomechanical loadings.