Anhysteretic Magneto-Elastic Behaviour of Terfenol-D: Experiments, Multiscale Modelling and Analytical Formulas

Area of Science:

• Materials Science
• Solid Mechanics
• Magnetism

Background:

• Giant magnetostrictive materials (e.g., Terfenol-D, Galfenol) are vital for actuators and sensors.
• These materials convert magnetic energy to mechanical strain and vice versa.
• Operating conditions often involve significant applied stress, necessitating understanding of magneto-mechanical coupling.

Purpose of the Study:

• To comprehensively characterize the anhysteretic magneto-mechanical behavior of Terfenol-D under stress.
• To develop and validate a multiscale model for predicting this behavior.
• To provide an analytical model for describing Terfenol-D's strain response.

Main Methods:

• Experimental characterization of Terfenol-D's magneto-mechanical response.
• Application of an energy-based multiscale modeling approach.
• Derivation of an analytical model from the multiscale framework.

Main Results:

• Detailed characterization of Terfenol-D's anhysteretic magneto-mechanical behavior under stress.
• Successful modeling of the material's response using a multiscale approach.
• Validation of an analytical model for predicting strain behavior.

Conclusions:

• The magneto-mechanical behavior of Terfenol-D under stress is well-characterized.
• The developed multiscale model accurately describes the material's response.
• An analytical model effectively predicts the strain behavior of Terfenol-D, aiding device design.