An analysis of the load-carrying capacity of elements subjected to complex stress states with a focus on the microstructural failure

The paper analyses the load-bearing capacity of S235JR steel elements subjected to complex stress states, taking into account the effect of microstructural damage. Assessing the material required conducting a microstructural analysis and standardized tensile strength tests. A modified Gurson–Tvergaard–Needelman (GTN) model was used to numerically analyse S235JR steel elements under the action of complex stresses. The results of the numerical analysis were reported to be consistent with those obtained during the strength tests. The method for the numerical calculations was described along with the admissible results and the criteria of failure for S235JR steel basing on the modified GTN model and the development of microdamage. As S235JR steel is a common structural material in Poland, the investigation results will be of use to a number of engineers and other specialists responsible for determining the load-carrying capacity and structural safety of elements or whole systems.