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[57950] Artykuł: Experimental determination of the void volume fraction for S235JR steel at failure in the range of high stress triaxialitiesCzasopismo: Archives of Metallurgy and Materials Tom: 62, Zeszyt: 1, Strony: 167-172ISSN: 2300-1909 Opublikowano: 2017 Liczba arkuszy wydawniczych: 0.50 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 30 DOI Keywords: failure  critical void volume fraction fF  Gurson-Tvergaard-Needleman material model  S235JR steel  high stress triaxiality  |
This paper is concerned with the critical void volume fraction f F representing the size of microdefects in a material at the
time of failure. The parameter is one of the constants of the Gurson-Tvergaard-Needleman (GTN) material model that need to be
determined while modelling material failure processes. In this paper, an original experimental method is proposed to determine the
values of fF. The material studied was S235JR steel. After tensile tests, the void volume fraction was measured at the fracture surface
using an advanced technique of quantitative image analysis The material was subjected to high initial stress triaxialities T0 ranging
from 0.556 to 1.345. The failure processes in S235JR steel were analysed taking into account the influence of the state of stress.