J. Phys. IV France 07 (1997) C5-519-C5-524
On the Damping Behaviour of Niti Shape Memory AlloyY. Liu and J. van Humbeeck
Department MTM, Katholieke Universiteit Leuven, de Croylaan 2, 3001 Heverlee, Belgium
Shape memory alloys exhibit a high damping capacity in the martensite state. Results obtained from both DMA and cyclic tests under tension-compression load show that the martensite damping capacity in NiTi SMAs is a function of both strain amplitude and annealing temperature. Internal friction due to movements of martensite twin boundaries within both elastic (accommodation) and inelastic (reorientation) ranges as a function of strain amplitude seems to be consistent. A critical annealing temperature exists for deformed NiTi SMAs in order to obtain a high martensite damping capacity. Under tension-compression cyclic loading, the martensite damping decreases as the number of cycles increases, and it tends to stabilize with further cycling.
© EDP Sciences 1997