Modelling the Damage of Structural Components with Macrostructure Defects

Abstract

The article presents a numerical analysis of the process of damage of structural steel, the scope of which encompassed the estimation of the time to failure of a structural component. The analysis was conducted using the Gurson–Tvergaard–Needleman material model, which takes into account the influence of microdefects on material strength. Considered was a plate element with a central hole modelling the material discontinuity that may arise in a structural component as a result of corrosion. The conducted simulation permitted an analysis of the phenomenon of nucleation and evolution of microdamage in S235JR steel, which allowed, for the analysed component, the detection of the initiation of microdamages and their development in the area susceptible to damage. Changes to the state of stress taking place during plastic deformation of structural steel due to the evolution of microdefects of the material structure were analysed. Presented are the results of this research, in which the stress state described by the stress triaxiality in relation to the changes in the volumetric fraction of voids determining the size of microdefects was given a detailed analysis.

Quasi-Static and Dynamic Testing of Metallic Materials

“…As mentioned, no materials are completely homogeneous. Kossakowski [3] has done numerical simulations of microdamage evolution in a steel component. The initial damage was considered in the size range of what can be expected from pitting corrosion in structural components.…”

Solidification Crack Evolution in High-Strength Steel Welding Using the Extended Finite Element Method

“…This conventional fracture modeling accounted for the static interaction between the initial defect and weld matrix. The continuum damage mechanics model [14] and the Gurson-Tvergaard-Needleman material model [15] were put forward to predict the crack behavior of weld metal and the damage of structural components with macrostructure defects, respectively. However, for the full understanding of the solidification cracking mechanism, the understanding of the propagation evolution is still absent.…”