Abstract
This paper analyzes the changes in the state of stress in the plastically deforming structural steel which are attributable to the evolution of defects in the microstructure of the material. Numerical simulations were conducted to study the behaviour of a structural element under tensile stress using the Gurson-Tvergaard-Needleman material model for porous media. The model can be employed to assess the effects of microstructural phenomena on the strength of a material under plastic deformation. The main aim of the analysis was to determine the relationship between the changes in the triaxial state of stress and the changes in the volume fraction of voids, characterizing the material porosity.
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