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J. Phys. IV France
Volume 07, Number C5, November 1997
IVth European Symposium on Martensitic Transformations
Page(s) C5-519 - C5-524
IVth European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-519-C5-524

DOI: 10.1051/jp4:1997582

On the Damping Behaviour of Niti Shape Memory Alloy

Y. 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