In this experiment, the axial deformation caused during pure torsion in investigated. It was found that axial strains approaching 0.5% are generated when maximum torsional shear strain at the outer radius is 16%. The axial and torsional strains are fully recovered upon unloading. Further study of the micromechanical mechanisms at play is needed to advance the understanding of Nitinol behavior and allow for greater accuracy in modeling and actuator development. Clearly, “pure” torsion (and, conversely, “pure” tension) modes of deformation are impossible to achieve as the two modes are deeply coupled.
Changes in Length during Free End Torsion of Nitinol Rods / J. M., Walker; M., Elahinia; Spaggiari, Andrea. - ELETTRONICO. - (2013), pp. 117-118. (Intervento presentato al convegno International Conference on Shape Memory and Superelastic Technologies tenutosi a Prague (CZ) nel May, 20 - May, 24 2013).
Changes in Length during Free End Torsion of Nitinol Rods
SPAGGIARI, Andrea
2013
Abstract
In this experiment, the axial deformation caused during pure torsion in investigated. It was found that axial strains approaching 0.5% are generated when maximum torsional shear strain at the outer radius is 16%. The axial and torsional strains are fully recovered upon unloading. Further study of the micromechanical mechanisms at play is needed to advance the understanding of Nitinol behavior and allow for greater accuracy in modeling and actuator development. Clearly, “pure” torsion (and, conversely, “pure” tension) modes of deformation are impossible to achieve as the two modes are deeply coupled.
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