Nonlinear bending response of giant magnetostrictive laminated actuators in magnetic fields

Abstract

We report numerical and experimental investigations into the nonlinear bending behavior of magnetostrictive laminated actuators under magnetic fields. Magnetostrictive actuators were fabricated from thin layers of Terfenol-D and metal, and the magnetostriction of the devices was measured. A nonlinear finite element analysis was employed to evaluate the contribution of magnetic domain switching to the second-order magnetoelastic constants in the Terfenol-D layer. The effect of a magnetic field on the nonlinear deflection and internal stress of magnetostrictive laminated actuators is discussed.

Effect of the Loading Rate on the Brittle Fracture of Terfenol-D Specimens in Magnetic Field: Strain Energy Density Approach

“…It has also been found that Terfenol-D exhibits the fracture load reduction as the loading rate decreases. A similar behavior has been observed for other materials, such as TiAl alloys [19] and piezoelectric ceramics [20,21]. Since Terfenol-D material properties are loading rate-dependent, here it is assumed that the critical radius R c , which depends on the material, varies with the loading rate.…”

Electromagneto-mechanical Behavior of Giant Magnetostrictive/Piezoelectric Laminates under Electric Fields for Self-Sensing Cantilever Actuators

“…Making use of magnetic field dependent material properties, the model calculated the nonlinear behavior. The finite element computations were provided by modifying the program with routines developed by our previous work (9), (10) .…”

Fracture Behavior of Cracked Giant Magnetostrictive Materials in Three‐Point Bending under Magnetic Fields: Strain Energy Density Criterion

“…[3] They are typically used in automotive industry, as opening regulators in injection control valves, in avionics, as sensors and actuators in vibrations' control, and in robotics, as micropositioning actuators. Although the strain property of magnetostrictive materials under a magnetic field (Joule effect) is usually exploited, these materials have also the dual ability to change their magnetic properties as a consequence of a deformation (Villari effect).…”