Constitutive Modeling of Magneto-Mechanical CouplingResponse of Magnetic Field-Induced Phase Transformationsin NiMnCoIn Magnetic Shape Memory Alloys

摘要

The unique characteristic of magnetic field induced phase transformation of NiMnCoIn magnetic shape memoryalloys (MSMAs) lies in the generation of large transformation strains under high constant stress levels. Motivatedby experiments, a constitutive model is proposed to take into account magnetic field induced phase transformationfrom austenitic to martensitic phase. The working principle of such materials is described by the deformationof continua due to mechanical and magnetic forces. The cross coupling of mechanical and magnetic variables iscaptured by introducing nonlinear kinematics. In the present work, microstructure dependence of martensiticphase transformation is taken into account by introducing internal variables into the model. The constitutiveresponse is derived in a consistent thermodynamic way.