The present study aims at developing a new Shape Memory Alloy (SMA) autonomous torsion actuator that exhibits Two-Way reversible memory effect Assisted by SuperElasticity. developed noted hereafter TWASE is composed single NiTi compact component having two distinct SMAs parts on one axis: SuperElastic part (length LSE) and Effect LSME). proposed design ensures twisting the when heated, this act...

Abstract Cu-based shape memory alloys belong to one important class of functional alloys, presenting effect and superelasticity due their reversible martensitic transformation. Although they have been extensively studied since the middle last century, there are still many challenges be solved. In decades, these were regarding new compositions, processing routes, phase transformation, mechanical...

Ni–Mn–Ga polycrystalline alloy fibers with diameters of 33 μm are reported to exhibit significantly improved ductility and huge superelastic and shape memory strains in comparison to conventional brittle bulk polycrystalline alloys. Particularly, the recoverable strain of the Ni54.9–Mn23.5–Ga21.6 fiber can be as high as 10% at 40 ◦C. Such optimized behavior has been achieved by a suitable fabri...

OBJECTIVE This paper analyzed whether nickel-titanium closed coil springs (NTCCS) have a different superelastic (SE) behavior according to activation and whether their force plateau corresponds to that informed by the manufacturer. METHODS A total of 160 springs were divided into 16 subgroups according to their features and activated proportionally to the length of the extensible part (NiTi) ...

Impact responses of rectangular composite plates with embedded shape memory alloy (SMA) wires are investigated in the present research. The plate is assumed to be placed in a thermal environment; so that in contrast to the available researches in the field, the shape memory and ferroelasticity effects have to be considered also in addition to the superelasticity. The governing equations are der...