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https://doi.org/10.17559/TV-20220419093052

Experimental Determination of the Critical Value of the J-Integral that Refers to the HSLA Steel Welded Joint

Srđan Bulatović orcid.org/0000-0001-7864-6766 ; Institute for Materials Testing (IMS), 11000 Belgrade, Bulevar vojvode Mišića 43, Serbia
Vujadin Aleksić orcid.org/0000-0002-6987-3438 ; Institute for Materials Testing (IMS), 11000 Belgrade, Bulevar vojvode Mišića 43, Serbia
Ljubica Milović orcid.org/0000-0001-9618-055X ; Faculty of Technology and Metallurgy, 11000 Belgrade, Karnegijeva 4, Serbia
Bojana Zečević ; Innovation Centre of Faculty of Technology and Metallurgy, 11000 Belgrade, Karnegijeva 4, Serbia

Sažetak

Fracture mechanics, as a scientific discipline dealing with the study of cracks in welded structures, has defined parameters and introduced new test methods in order to better determine the tendency to crack growth, critical conditions for rapid fracture development, material resistance to rapid crack propagation and better definition of other parameters for assessing the behaviour of the material and the safety of the structure in the presence of cracks. In this paper, the focus is on determination of the parameter of elastic-plastic mechanics of J-integral, more precisely, on examination of the critical value of J-integral (JIc) of the welded joint of HSLA steel. The position of the tip of the fatigue crack and the properties of the region where fracture propagation occurs are main indicators of influence of the heterogeneity of the NN-70 welded structure and mechanical properties. Resistance to cracking in the welded joint shows that the heterogeneity has a major impact on the resistance to crack initiation and propagation, in elastic as well as in the plastic region.

Ključne riječi

elastic-plastic fracture mechanics parameters; HSLA steel; J-integral; welded joints

Hrčak ID:

288406

URI

https://hrcak.srce.hr/288406

Datum izdavanja:

15.12.2022.

Posjeta: 579 *