Issue 49

E. Abdelouahed et alii, Frattura ed Integrità Strutturale, 49 (2019) 698-713; DOI: 10.3221/IGF-ESIS.49.63 709 Figure 15 : Damage moment-rotation curve under closing moment in the case of a) middle position with effect of their type and in the case of b) all thickness section default with effect of their position The defect quality effect is conditioned by its location, in the case of closing bending moment as the opening case, its quality does not have much influence on the level and the structure response up to their damage. This situation is explained by the concentration of efforts on this area. By the fact that the defect is always at these locations in the extrados of the elbow, its dangerousness increase according to the mode of bending, in other words the fibers of the composite are in tension or in excessive compression by the ovalization of the elbow. These fibers will strongly react with the approximation of defects, which is the case for the closing bending moment, particularly the defect in the middle and the one near the end of the elbow or the critical moment’s levels. Is weak with a value close to 9000Nm. Figure 16 : Hashin damage representation in structure with elbows of 60° under closing moment, type (3)