Study of Lattice Strain Evolution in Stainless Steel Under Tension: The Role of Self‐Consistent Plasticity Model

The recently developed large strain elastic visco‐plastic self‐consistent (EVPSC) model, with various popular self‐consistent schemes including the Affine, Meff, Secant, and Tangent, is used to study the lattice strain evolution in a stainless steel under uniaxial tension. The material parameters for the various self‐consistent schemes are fitted to experimental stress and strain curve under uniaxial tension. An assessment of the predictive capability of the self‐consistent schemes is performed based on comparisons of the predicted lattice strain evolutions and in situ neutron diffraction measurements done on the same material. It is found that, among the self‐consistent schemes examined, the self‐consistent schemes with grain interaction stiffness halfway between those of the limiting Secant (stiff) and Tangent (compliant) approximations give the best results.