The shape memory effect (SME) and superelasticity (SE) appear in shape memory alloy (SMA). If an SMA thin strip is twisted, the rotary motion can be obtained easily and therefore we can develop a simple rotary-driving element by using the SMA thin strip. In the present study, the performance of the SMA thin strip for rotary-driving elements is investigated. The torsional deformation properties of the SMA thin strip are investigated. Elongation of the edge in the SMA thin strip is measured. The variation in temperature on the surface of the strip is observed by the infrared thermograph. The highest temperature rise appears at the edge of the strip due to the martensitic transformation during twisting. The cyclic deformation properties in torsion of the strip are investigated in both temperature regions of SME ans SE. The relationship between torque and angle of twist varies slightly till 50 cycles in both SME and SE. The torsional fatigue properties are investigated by both pulsating and alternating fatigue tests. The fatigue life in alternating torsion is shorter than that in pulsating torsion. The relationship between angle of twist and the number of cycles to failure in the low-cycle fatigue region is expressed by a power function for both pulsating torsion and alternating torsion. A door model composed of an SME-SMA strip and an SE-SMA strip is fabricated. The two-way motion with opening and closing of the door is demonstrated.

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