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Archives of Civil Engineering

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Effect of Initial Porosity on Material Response Under Multi-Axial Stress State for S235JR Steel

P.G. Kossakowski
  • Chair of Strength of Materials and Concrete Structures, Faculty of Civil Engineering and Architecture, Kielce University of Technology, Kielce, Poland
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Published Online: 2012-12-28 | DOI: https://doi.org/10.2478/v.10169-012-0024-x


The effect of the initial porosity on the material response under multi-axial stress state for S235JR steel using the Gurson-Tvergaard-Needleman (GTN) material model was examined. Three levels of initial porosity, defined by the void volume fraction f0, were considered: zero porosity for fully dense material without pores, average and maximum porosity according to the metallurgical requirements for S235JR steel. The effect of the initial porosity on the material response was noticed for tensile elements under multi-axial stress state defined by high stress triaxiality σme = 1.345. This effect was especially noticeable at the range of the material failure. In terms of the load-bearing capacity of the elements, the conservative results were obtained when maximum value of f0 = 0.0024 was used for S235JR steel under multi-axial stress state, and this value is recommended to use in the calculations in order to preserve the highest safety level of the structure. In usual engineering calculations, the average porosity defined by f0 = 0.001 may be applied for S235JR.

Keywords : Initial porosity; initial void volume fraction f0; Gurson-Tvergaard-Needleman material model; multi-axial stress states; high stress triaxiality; voids; numerical calculations; S235JR steel.


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About the article

Published Online: 2012-12-28

Published in Print: 2012-12-01

Citation Information: Archives of Civil Engineering, ISSN (Online) 1230-2945, DOI: https://doi.org/10.2478/v.10169-012-0024-x. Export Citation

© Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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P.G. Kossakowski
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