A finite strain thermomechanically-coupled constitutive model for phase transformation and (transformation-induced) plastic deformation in NiTi single crystals

A 3D finite-strain constitutive model for the deformation response of NiTi at single crystal level is proposed. The accounts reversible phase transformation from austenite to martensite habit plane variants, plastic in phase, and rate effects induced latent heat. It developed within formalism irreversible thermodynamics with internal state variables based on Eulerian logarithmic strain its corrotational objective rate. inelastic defined as an average over a representative volume element classical micromechanics-based modeling approach. Transformation-induced viewed mechanism accommodation local incompatibility austenite–martensite interface. accounted by introducing interaction term free energy, which described through Eshelby tensor regarding variants ellipsoidal inclusions embedded matrix, order accurately reflect stress states that contribute dislocation slipping. numerical implementation efficient scheme calibration are detail. proposed validated comparing simulations available experimental data crystals. Numerical polycrystals performed obtain insight into between intergrannular constraints. efficiency verified indentation tests.