Original scientific paper

Numerical analysis of constraint effect on ductile tearing in strength mismatched welded CCT specimens using micromechanical approach

Bashir Younise orcid.org/0000-0001-9711-1230 ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11000 Belgrade, Serbia
Marko Rakin orcid.org/0000-0002-3965-0380 ; University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
Bojan Medjo ; University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
Nenad Gubeljak orcid.org/0000-0002-3276-8431 ; University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, SI-2000 Maribor, Slovenia
Dražan Kozak orcid.org/0000-0001-5245-4686 ; J. J. Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, Trg Ivane Brlić-Mažuranić 2, HR-35000 Slavonski Brod, Croatia
Aleksandar Sedmak ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11000 Belgrade, Serbia

Abstract

In this paper, constraint effect on ductile fracture initiation and propagation has been studied. Three-dimensional finite element analyses of mismatched welded joints made of high strength steel, have been performed for centre-cracked tensile (CCT) specimens. Different weld widths and material mismatching ratios have been considered. Ductile fracture parameter, crack tip opening displacement at crack growth initiation (CTODi), has been obtained for centre-cracked tensile (CCT) specimens using local approach to fracture and compared with experimental results of single edge bend specimens. Micromechanical complete Gurson model has been applied to investigate fracture behaviour of cracked welded joints. Crack tip constraint has been analysed through stress triaxiality in order to study transferability of fracture parameters from one geometry to another.

Keywords

constraint effect; ductile fracture; finite element analysis; material mismatching; stress triaxiality; transferability

Hrčak ID:

71812

URI

https://hrcak.srce.hr/71812

Publication date:

26.9.2011.

Article data in other languages: croatian

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