Mechanical Modeling And Analysis For Ferromagnetic Shape Memory Alloy And Particle Composite

Ferromagnetic shape memory alloys is a new kind of functional materials,it not only has the thermal elastic shape effect that can be controlled by temperature, but also has the magnetic shape memory effect that can be controlled by the magnetic.This kind of alloy has a great recovery strain,stress,high response frequency,and it can be precisely controlled.Because the ferromagnetic shape memory alloy has the ability of sensing and actuation at the same time,it has a broad prospects in scientific research and engineering application,it’s one of the popular intelligent materials research.Ni Mn Ga is the ferromagnetic shape memory alloy that has been found earliest, the study on it is also the most representative.A model to describe the constitutive behavior of magnetic shape memory alloy composed with pure martensite is proposed based on the analysis of variants reorientation. A hyperbolic tangent expression is given to describe the variants transition during magnetic and mechanical loading process. The main features of magnetic shape memory alloy, such as pseudoelastic and partially pseudoelastic behavior as well as minor hysteretic loops, can be successfully replicated with the proposed model. A good agreement is achieved between calculated results and experimental data for Ni Mn Ga single crystal.Based on the description for ferromagnetic shape memory alloys(FSMAs) incorporating Eshelby theory and M-T theory, a constitutive model was proposed to predict the magneto-mechanical behaviors of FSMA particulate composite. The influencing factors, such as volume fraction of particles, were analyzed. The magnetic field induced strain and other mechanical properties under different magnetic field intensity were also investigated.