A multi-physics, multi-scale and finite strain crystal plasticity-based model for pseudoelastic NiTi shape memory alloy

A crystal plasticity-based constitutive model is developed to describe the thermomechanical behavior of pseudoelastic NiTi single crystal. The includes, for first time in literature, all inelastic mechanisms influencing fatigue SMAs a finite strain framework: martensite transformation, deformation slip austenite at high-temperature, twinning large strain, transformation-induced plasticity (TRIP) as well coupling. Furthermore, new internal variables and evolution laws are introduced monocycle (referred basic remainder paper) reproduce main features anisotropic cyclic numerical implementation performed CAST3M (2019) element software through user-defined UMAT subroutine. series simulations were verify generalized models under various conditions. Moreover, robustness attested by comparing simulation results with reported data effect crystallographic orientation revealed shown be quantitatively good agreement experimental results. Finally, dislocation density stored energy discussed from perspective analysis SMAs.