Issue 60

H. Djeloud et alii, Frattura ed Integrità Strutturale, 60 (2022) 346-362; DOI: 10.3221/IGF-ESIS.60.24

Figure 6: Optical micrograph of heat affected zone HAZ. The microstructure of the weld metal is dendritic, consists of a fine-grained non-equilibrium (acicular) ferrite, and pearlite structure with troostite precipitates, nucleating mainly at the solidification grain boundaries which results from the lower cooling rate Fig. 7 [58] .

Figure 7: Optical micrograph of weld metal zone WM.

R ESULTS AND DISCUSSIONS

fter examining a lot of studies, it is clear that few researchers used the SED approach to assess SIF in the case of the cracked component and mention here [59–62]. As stated in the paper F. Berto ‘This approach cannot be applied to notch with zero opening angle (cracks) subjected to mixed mode loading’ , this is confirmed in this study, by comparing the results with one of the most effective methods J-integral. A

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