Issue 43

D. Gentile, Frattura ed Integrità Strutturale, 43 (2018) 155-170; DOI: 10.3221/IGF-ESIS.43.12

Fig. 19 shows the G II values (max min and average) calculated at maximum load. It is possible to note that the material L1 and T1000-3 give a shorter dispersion data. For these materials bridging occurs less time that the others materials.

Figure 16 . Summary of strain energy release rates for tested materials.

0.7

G

I =0.52533-0.04285*t

0.6

0.5

0.4

I [kJ/m 2 ]

0.3

G

0.2

0.1

0.0

2

3

4

5

6

7

8

9 10

Thickness [mm] Figure 17. Average strain energy release vs specimen thickness.

Figure 18 . Bridging in a DCB specimen.

168