PSI - Issue 33

Toru Yagi et al. / Procedia Structural Integrity 33 (2021) 1225–1234 Author name / Structural Integrity Procedia 00 (2019) 000 – 000 closure2 = ∫ ∫ ( √ 2 ) 3 2 ∙ 1 + 1 ( ) 2 ∙ (− Y ) 0 ⁄2 0

1233

9

(6)

Fig. 14 Schematic image of fracture surface with local brittle zone

The important assumption for interpretation of the model calculation results is the difference in minimum crack velocity based on the theory of plastic strain. Since the plastic strain is big in bending mode, the minimum crack velocity will be close to static solution while one of tensile mode is around 400m/s since its plastic strain is small

Fig. 15 Pop-in crack arrest mechanism

based on the previous study. The minimum crack velocity of bending mode is set as 10m/s in this study. Fig. 15 is the schematic image of the arrest of the pop-in crack.

Fig. 16 New pop-in criterion