عنوان مقاله [English]
Terfenol-D as a magnetostrictive material is widely used in actuators because of its high force and displacement. One of the main limitations of Terfenol-D is dependency of its structural coefficients like elastic compliance and magnetostrictive coefficients to applied mechanical stress and magnetic field which makes it difficult to predict the actuator’s behavior. In the present paper, an analytical-experimental model is presented to predict the mentioned coefficients at different operating conditions. Initially, by using an experimental fabricated setup and tension test equipment, the nonlinear stress-strain behavior of the Terfenol-D actuator is studied at different conditions and by analyzing the obtained results and applying the linear magnetomechanical model, elastic compliance, magnetostrictive, magnetic permeability and magnetomaechanial coupling coefficients are calculated. Then, a model based on linear approximating relations is presented which can predict the coefficients at determined magnetic field intensity only by importing three values of stress. Calculating values of stress and strain by using the model and comparing the results to the experimental results shows acceptable precision of the model. Finally, the proposed model is applied to predict magnetomechanical behavior of Terfenol-D and being validated. Comparing the results to experimental ones shows capability of the model at predicting magnetomechanical behavior of Terfenol-D at different operational conditions, as the maximum errors of calculated strains and magnetic fluxes are 3% and 3.4%, respectively.