Magneto–Mechanical Coupling Performance of Porous Ferromagnetic Shape Memory Alloy

Porous Ferromagnetic Shape Memory Alloy (FSMA) has excellent magneto mechanical properties. A micromechanical constitutive model based on the Eshelby equivalent inclusion theory and Mori–Tanaka (M-T) method is established, which can describe and predict the magneto–mechanical coupling behavior of porous FSMA. The numerical results are closer to the Couch’s experimental data, verifying the validity of the established model. The mechanical behavior of porous FSMA with different conditions of magneto–mechanical coupling is investigated. The results show that the maximum reorientation strain increases with the increase of the porosity, and the critical stresses at the beginning and end of the reorientation of porous FSMA increase with the increase of the magnetic field strength. In addition, the characteristics of equivalent elastic modulus, magnetic strain and magnetic stress of porous FSMA are also analyzed. The results of the study can provide a theoretical basis for the application of such materials in practical engineering.