PSI - Issue 28

Koji Uenishi et al. / Procedia Structural Integrity 28 (2020) 2072–2077 Uenishi et al./ Structural Integrity Procedia 00 (2020) 000 – 000

2075

4

10 mm

Tensile loading

Initiation of the secondary fracture

Branched primary fracture

Total split of the specimen

Primary fracture

0

20

40

60

80

100 [  s]

Arrest of the secondary fracture

140

180

220

260

300

340 [  s]

Resumption of propagation of the secondary fracture

Total split of the specimen by the secondary fracture

3

2

1

2

360

380

400

420 [  s]

Fig. 3. Fracture evolution in a specimen illustrated in Fig. 1b, with the uniaxially applied tensile strain rate of 1.3  10 − 2 /s. Surprisingly, the secondary fracture, initiated upon a total split of the primary fracture, resumes its propagation after some 200  s of arrest. This behaviour of the secondary fracture cannot be foreseen from the global relation, Fig. 2. The time elapsed after the left-top snapshot is shown beneath each picture.

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