PSI - Issue 33

Branislav Djordjevic et al. / Procedia Structural Integrity 33 (2021) 781–787 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

785

5

Table 4. Values of Jc , r c and z c of tested C(T)50 specimens at -60°C J c N/mm B net mm r c mm

Displ.rate v (mm/min)

z c mm 4.91 2.53 2.63 2.89 0.25 3.28

178.2 211.8 241.2 286.9 340.3 409.0 424.1 447.5 483.4 582.3 660.8

16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0

0.60 0.62 0.63 0.53 0.75 1.35 1.35 1.11 1.17 1.44

0.500 0.020 0.020 0.020 0.500 0.020 0.020 0.500 0.020 0.020 0.500

0.1

0

2.68 0.51

2.1

/

Table 5. Values of J c , r c of tested C(T)50 specimens at -90°C J c N/mm B net mm

Displ.rate v (mm/min)

r c mm 0.15 0.13 0.19 0.71 0.31 0.69 1.00 0.35 0.42 0.36 0.36 0.23 0.47 0.69 / /

49.4 49.7 50.6 63.8 82.3 84.4 85.2

20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0

0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500

121.2 121.3 129.2 135.2 153.9 179.2 233.6 270.2 176

Table 6. Values of J c of tested C(T)50 specimens (B net = 20 mm) at -60°C J c N/mm B net mm

Displ.rate v (mm/min)

60

20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0

0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500

120 124 168 195 215 286 304 434 448 518 560 630

340.3

1.4. Discussion Based on the obtained results, i.e. obtained J c parameter, scatter can be observed to be greater with higher temperature, as can be seen on the Fig. 3a. As well with temperature influence, it can be observed obvious influence of the specimen thickness on the J c values as well, from the diagram in Fig. 3b, which shows the results from previous testing along with new ones at - 60℃. Both series of testing are marked with specimen thickness. From diagram in