CYCLIC DEFORMATION PROPERTIES IN A WIRE OF TiNi SHAPE MEMORY ALLOY SUBJECTED TO CYCLIC LOADINGS

Abstract The cyclic deformation and fatigue of a TiNi shape-memory alloy wire was studied by carrying out rotating-bending fatigue tests at various strain amplitudes, temperatures and rotational speeds in air and in water. The results were summarized as follows: (1) for strain amplitudes in the rhombohedral-phase transformation region, the fatigue life was longer than 107 cycles and the deformation properties did not change under cyclic deformation; (2) for the strain amplitudes in the martensitic transformation region, the fatigue life was shorter than 105 cycles and the higher the temperature, the shorter was the fatigue life; (3) the rotational speed did not affect the fatigue life in water but a higher rotational speed led to a shorter fatigue life in air.

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Compression and Compression-Compression Cyclic Deformation Properties of Ferromagnetic Ni2MnGa-Based Shape Memory Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.426-432.2207 ◽

2003 ◽

Vol 426-432 ◽

pp. 2207-2212 ◽

Cited By ~ 7

Author(s):

Takashi Kira ◽

Kinzo Murata ◽

Tamotsu Shimada ◽

Soon Jong Jeong ◽

Shozo Inoue ◽

...

Keyword(s):

Shape Memory Alloy ◽

Shape Memory ◽

Cyclic Deformation ◽

Deformation Properties

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Cyclic Deformation Properties of TiNi Shape Memory Alloy. Shape Memory Effect due to Martensitic and R-Phase Transformations.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.61.2629 ◽

1995 ◽

Vol 61 (592) ◽

pp. 2629-2635 ◽

Cited By ~ 2

Author(s):

Akira Ikai ◽

Hisaaki Tobushi ◽

Ping-Hua Lin ◽

Shinya Yamada

Keyword(s):

Shape Memory Alloy ◽

Shape Memory ◽

Phase Transformations ◽

Shape Memory Effect ◽

Memory Effect ◽

Cyclic Deformation ◽

Deformation Properties

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Cyclic Deformation and Fatigue of a TiNi Shape-Memory Alloy Wire Subjected to Rotating Bending

Journal of Engineering Materials and Technology ◽

10.1115/1.2806839 ◽

1998 ◽

Vol 120 (1) ◽

pp. 64-70 ◽

Cited By ~ 40

Author(s):

H. Tobushi ◽

T. Hachisuka ◽

T. Hashimoto ◽

S. Yamada

Keyword(s):

Fatigue Life ◽

Shape Memory Alloy ◽

Shape Memory ◽

Rotational Speed ◽

Cyclic Deformation ◽

Rhombohedral Phase ◽

Shape Memory Alloy Wire ◽

Alloy Wire ◽

Deformation Properties ◽

Rotating Bending

The cyclic deformation and fatigue of a TiNi shape-memory alloy wire were studied by carrying out rotating-bending fatigue tests at various strain amplitudes, temperatures, and rotational speeds in air and in water. The results were summarized as follows: (1) for strain amplitudes in the rhombohedral-phase transformation region, the fatigue life was longer than 107 cycles and the deformation properties did not change under cyclic deformation; (2) for the strain amplitudes in the martensitic transformation region, the fatigue life was shorter than 105 cycles and the higher the temperature, the shorter was the fatigue life; (3) the rotational speed did not affect the fatigue life in water but a higher rotational speed led to a shorter fatigue life in air.

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