Analysis of Trigger Line Models for Shape Memory Hysteresis Based on Dynamic Testing

Trigger line models for the behaviour within the pseudoelastic hysteresis of shape memory alloys are considered in the analysis of the dynamic response of a cantilevered beam constrained by shape memory wires. Quantitative results of damping and shift in natural frequencies of the structure are presented. The results are compared to theoretical predictions of the effect of inner hysteresis loops on structural dynamics. The comparison suggests that there may be two trigger lines, one for loading and one for unloading, within the hysteresis loop.