The Influence of Microstructural Defects on the Stress State of S235JR Steel under Plastic Deformation

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.

• Periodical: Solid State Phenomena (Volume 250)
• Pages: 69-76
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.250.69
• Online since: April 2016
• Authors: Paweł Grzegorz Kossakowski*
• Keywords: GTN, Gurson-Tvergaard-Needleman Material Model, Micro-Defect, Numerical Simulation, S235JR Steel, State of Stress Analysis, Stress Triaxiality

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