Flow stress model accounting for the strain localization during plastic deformation of metals

Problem of description of flow stress in deformation processes, in which materials behaviour is affected by the strain localization, is discussed in the paper. Experiments included three groups of plastometric tests: i) uniaxial compression with the transverse flow not constrained by the tool; ii) channel die compression, in which the flow in one of the directions perpendicular to the die motion is constrained by the dieʹs wall, iii) ring compression. Inverse analysis was applied to determine flow stress independent of the inhomogeneities of deformation and of the influence of friction. Combining the flow stress data with the state of strain in the material allowed suggestion of the flow stress model accounting for the strain localization.