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[30171] Artykuł:

Effect of initial porosity on material response under multi-axial stress state for S235JR steel

Czasopismo: Archives of Civil Engineering   Tom: 58, Zeszyt: 4, Strony: 445-462
ISSN:  1230-2945
Opublikowano: 2012
 
  Autorzy / Redaktorzy / Twórcy
Imię i nazwisko Wydział Katedra Procent
udziału		 Liczba
punktów
Paweł Kossakowski orcid logoWBiAKatedra Wytrzymałości Materiałów, Konstrukcji Betonowych i Mostowych *****1006.00  

Grupa MNiSW:  Publikacja w recenzowanym czasopiśmie wymienionym w wykazie ministra MNiSzW (część B)
Punkty MNiSW: 6

Pełny tekstPełny tekst     Web of Science LogoYADDA/CEON    
Słowa kluczowe:

porowatość początkowa  objętość pustek początkowa  model materiałowy Gurson-Tvergaard-Needleman  stany naprężeń wieloosiowe  naprężenie trójosiowe duże  pustki  obliczenia numeryczne  stal S235JR 

Keywords:

initial porosity  initial void volume fraction  Gurson-Tvergaard-Needleman material model  multi-axial stress states  high stress triaxiality  voids  numerical calculations  S235JR steel 


Abstract:

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 sigma m/sigma e = 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.


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