Issue 43

D. Gentile, Frattura ed Integrità Strutturale, 43 (2018) 155-170; DOI: 10.3221/IGF-ESIS.43.12 169 Average G II [KJ/m 2 ] MAT NL VIS MAX L1 1.05566 1.18446 1.19325 L2 1.3823 1.41844 1.42526 T3 1.55113 1.65783 1.66877 T6 0.98038 1.06658 1.08361 M30_8 1.47872 1.56995 1.58716 Table 9 : Average GII values from ENF tests (NL=non-linearity; VIS= visual stable crack extension; MAX= maximum load, see Fig. 4a). An example of average G II calculation is given in Fig. 19 for Material T3. Figure 19 : G II at max load for material T3. Figure 20 : G II calculated at maximum load.