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

[+] Author and Article Information
H. Tobushi, T. Hachisuka, T. Hashimoto

Department of Mechanical Engineering, Aichi Institute of Technology, Toyota 470-03, Japan

S. Yamada

Sato Kogyo, Tokyo, 103, Japan

J. Eng. Mater. Technol 120(1), 64-70 (Jan 01, 1998) (7 pages) doi:10.1115/1.2806839 History: Received January 12, 1997; Revised June 23, 1997; Online November 27, 2007


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.

Copyright © 1998 by The American Society of Mechanical Engineers
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