What Is Reversible Strain?
Reversible strain is the portion of deformation in a shape memory alloy (SMA) that can be fully recovered after the removal of mechanical stress or after heating above the transformation temperature. It arises from a combination of elastic deformation and reversible martensitic phase transformation, and explicitly excludes plastic (permanent) strain.
Importance of Reversible Strain in Actuation
In SMA-based actuators, reversible strain defines the maximum usable deformation for cyclic operation. High reversible strain enables larger actuation strokes while maintaining material integrity and long functional life. Controlling reversible strain is therefore critical in the design of reliable SMA actuators, sensors, and adaptive systems.
Through advanced design and control, RVactuators can achieve reversible axial strains of up to 10%, enabling compact, high-displacement actuators for demanding motion-control and smart material applications.