Issue 48

R. Brighenti et alii, Frattura ed Integrità Strutturale, 48 (2019) 1-9; DOI: 10.3221/IGF-ESIS.48.01 7 Figure 3 : (a) True stress vs stretch for the examined material. (b) Variation of the Poisson’s ratio with the deformation. Experimental and theoretical values are reported. In Fig. 4 the crack tip splitting phenomenon is shown at the incipient failure for the specimens C2b, C3b and C4b, while the whole crack paths after failure are depicted in Fig. 4 for the three strain rates adopted, 1   , 2   , 3   . (a) (b) (c) Figure 4 : Crack tip splitting at the incipient failure for specimens (a) C2b, (b) C3b and (c) C4b. (a) 1   (b) 2   (c) 3   (d) 1   (e) 2   (f) 3   (g) 1   (h) 2   (i) 3   Figure 5 : Crack paths for specimens (a) C2a, (b) C2b, (c) C2c, (d) C3a, (e) C3b, (f) C3c, (g) C4a, (h) C4b and (i) C4c (only half of each specimen corresponding to 0 Y  , see Fig. 1, is shown). The initial crack (blue straight line) grows as is indicated by the red line. a =15 mm a =20 mm a =10 mm