Issue 49

D. E. Belhadri et alii, Frattura ed Integrità Strutturale, 49 (2019) 599-613; DOI: 10.3221/IGF-ESIS.49.55 607 The behavior of the K III along the crack front is shown in Fig. 12 (A)for different values of (a). The median position of the crack is not sensitive to the variation of the K III . On the other hand, and as already pointed out, this variation becomes more and more marked where K III progresses proportionally as a function of depth (a). Fig. 12 (B) asserts that K III reaches maximal values at the outer limit of the elliptical crack. Figure 12: variation of K III along the front for different crack depth (A) variation of K III for position (4) of the crack (B). Repaired pipe with c = 60mm. Figure 13: variation of the SIF: K I , K II and K III along the crack front for different length. Repaired pipe with a = 7mm A second analysis is presented in the following for a constant depth a = 7mm and we change the length of the crack 2c. In these results it was found that the three stress concentration factors keep almost the same behavior noticed for the depth a with respect to the crack length 2c. The appearance of the K I shows the presence of three zones, the K II is independent