Constitutive equations for martensitic reorientation and detwinning in shape-memory alloys

Abstract

A crystal-inelasticity-based constitutive model for martensitic reorientation and detwinning in shape-memory alloys (SMA) was developed from basic thermodynamic principles. The model was implemented in a finite-element program by writing a user-material subroutine. The macroscopic stress-strain responses were calculated through a homogenization scheme. The calculations showed that the macroscopic stress-strain response depends strongly on the initial martensite microstructure and crystallographic texture of the material.