Abstract
In this paper, the two-way shape memory effect (TWSME) in a Ti–54.5 Ni(wt%) alloy wasinvestigated experimentally to develop a NiTi linear actuator. The two-way shapememory effect was induced through a compressive shape memory cycle comprisingfour steps: (1) loading to maximum deformation; (2) unloading; (3) heating; and(4) cooling. Six types of specimen (one solid cylindrical and five tubular) were used toobtain the two-way shape memory strain and two-way recovery stress and toevaluate the actuating capacity. The two-way actuating strain showed a saturatedtendency after several training cycles for the same maximum deformation. Amaximum value of the two-way strain was obtained for 7% of maximum deformation,independently of the geometry of the tubular specimens. The two-way strains obtainedby the shape memory cycles and two-way recovery stress linearly increase asa function of the maximum deformation and the two-way strain, respectively,and the geometry of specimen affects the two-way recovery stress. Although theresults show that sufficient recovery stress can be generated by either the two-wayshape memory process or by the one-way shape memory process, the two-wayshape memory process can be applied more conveniently to actuating applications.
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