We present a description of the current status of research on deformation properties
of elastoplastic materials under quasi-static loading. Based both on experimental and
theoretical approach and on the developed method, true stress-strain curves were produced in
the case of stretching of a cylindrical shell and a solid rod until fracture. The difference
between produced curves for these types of specimen is shown for the first time for
heterogeneous and non-uniaxial stress-strain state after beginning of the localization process
of deformation. We show that the difference between the curves is inversely proportional to
the volume rate of stress-strain state at the neck of a specimen.
Keywords: elastic materials; types of stress-strain state; true stress-strain curve.
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