PSI - Issue 16

Mykola Stashchuk et al. / Procedia Structural Integrity 16 (2019) 252–259 Mykola Stashchuk et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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7

Dislocation crack when p

Table 1. Numerical calculations of critical pressure depending on Burgers vector module B , m b =3· 10 – 10 2 b =6· 10 – 10 3 b =9· 10 – 10 5 b =15· 10 – 10

10 b =30· 10 – 10

p cr , МPа l eq = l cr , m

4000

2000

1333

800

400

0.26· 10

1.05· 10 – 8

2.36· 10 – 8

6.56· 10 – 8

26.23· 10 – 8

– 8

Fig. 4. Dependence of equilibrium and critical dislocation crack lengths l eq and l cr on internal pressure p .

l I K and

0 I K on dislocation crack length l .

Fig. 5. Dependence of

l I K and

0 I K according to (15) and (17) are presented in Fig. 5. Calculations were made using B=3b

Changes of

Burgers vector and internal pressure p =1000 MPa.