FEM analysis of localized deformation behaviour in pseudoelastic NiTi shape memory alloys

This paper takes into account the localized deformation behaviour of a pseudoelastic NiTi shape memory alloy with finite element method. A three-dimensional micromechanical model has been developed, in which the difference between the elastic properties of austenite and martensite is considered. The model is implemented as User MATerial subroutine (UMAT) into ABAQUS. Then, a polycrystalline NiTi shape memory alloy with [111] texture under ten tensile loading is simulated. The main features of the propagation of the deformation band reported in literatures are captured in the simulation. It is also shown that the initiation and propagation of the deformation bands are strongly affected by the geometry of the specimens.