Abstract
Brittle fracture of structural steel for building use, in general, is triggered by a ductile crack initiated at notched surface after undergoing a noticeable amount of plastic strain. The initiation of the ductile crack correlates to the triaxial states of stress and plastic strain in the notched section. As stress triaxiality and plastic strain are usually derived from finite element analysis, two material models with voids (Gurson-Tvergaard-Needleman model) and without voids are compared in this study. The results show that the effect of micro voids on elastic-plastic states of notched steels is small until ultimate strength. Furthermore, it is clarified that prediction of ductile crack can also be done well without consideration of voids.
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