Structural fatigue of pseudoelastic NiTi shape memory wires

In this study, we consider the influence of wire diameter and rotational speed on fatigue rupture behaviour in bending rotation fatigue experiments. We show that the dependence of fatigue life on wire diameter and rotational speed is no longer observed when the bending rotation fatigue experiments are conducted in a silicon oil bath at constant temperature, or at low rotational speeds in air. Moreover, we qualitatively discuss the stress distribution in the wire during fatigue testing as a starting point for various mechanical investigations, such as the calculation of the dissipated energy in the wire during bending rotation experiments or the bending moment acting during bending rotation.