Issue 49

S.A.G. Pereira et alii, Frattura ed Integrità Strutturale, 49(2019) 412-428; DOI: 10.3221/IGF-ESIS.49.40 422 2 2 2 0 2 2 3 8 arcos 9 II I I II I II K K K K K K               (23) SED   2 2 2 11 12 22 2 1 I Ic m K K a m a m a            (24)   2 2 11 12 22 2 1 II Ic K K a m a m a            (25)    11 1 cos cos a             12 2sin 2cos 1 a       (26)       22 1 1 cos 1 cos 3cos 1 a               3 4 ,    3 ,    1 for plane stress for plane deformation               (27) Circle 2 2 2 I II Ic K K K   (28) Ellipse 2 2 1  I II Ic IIc K K K K               (29) Figure 12 : a) Mixed mode fracture according to the MTS criterion, SED, ellipse and circle, b) Experimental points.