Abstract
In order to develop a rotary driving element with a shape-memory alloy (SMA) thin strip, the torsional deformation property, cyclic deformation property and torsional fatigue property of a TiNi SMA thin strip were investigated. The results obtained can be summarized as follows. (1) During twisting the SMA thin strip, the martensitic transformation appears along the edge of the thin strip and develops toward the central part. The rate of increase in the tensile strain of the edge increases gradually with an increase in angle of twist. (2) Torque increases with an increase in angle of twist. The torsional deformation properties change slightly under cyclic torsion. (3) With respect to the fatigue properties, the number of cycles to failure decreases with an increase in the angle of twist. The fatigue life in pulsating torsion is five times longer than that in alternating torsion at the same angle of twist. (4) The two-way rotary movement of an opening and closing door model was demonstrated. Therefore, a rotary driving element with a small and simple mechanism can be developed by using the SMA thin strip.
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