Shape memory alloys show the effect of functional fatigue under cyclically loading. This fatigue comes along with a decrease of the stress plateaus in the characteristic hysteresis curve which is also accompanied by an accumulated permanent strain. Cyclic experiments detected that a formation of dislocations trigger a stabilization of martensite and thus, are responsible for this kind of functional degradation. Our model takes into account the inelastic behavior by splitting the phase transformation from austenite to martensite into a reversible and an irreversible process. In addition to that, we include an orientation distribution function to account -in a numerically very advantageous way-for the shape memory alloy's polycrystalline structure, see [3].After presenting the material model [6], we comment on the implementation into a finite element framework. Starting with the simulation of a cyclically loaded wire, we close with the geometrically more ambitious and application-oriented example of a clamping ring as already presented in [7].