our Institute (selection):

The probe consists of a thin-walled SMA-tube, which guarantees an almost homogeneous distribution of shear stress over the cross section.

First the static torque-angle-behaviour is determined and quasiplasticity at low and pseudoelasticity at high temperature are identified.

Subsequent dynamic experiments are done by attaching inertial masses to the probe and measuring the angle of twist. In the free vibration experiment the probe is fixed at the top and the masses are turned to a fixed angle, whereby they distort the probe. After a few seconds they are released and undergo a free oscillation, with a considerable damping and -eventually- a residual angle at low temperature. Complete recovery is observed at high temperature.

If the torsional pendulum is excited by an oscillation with a prescribed amplitude and frequency and the response of the system is recorded,  a resonance spectrum with two peaks is observed.