Issue 35

R. Citarella, Frattura ed Integrità Strutturale, 35 (2015) 523-533; DOI: 10.3221/IGF-ESIS.35.58

a

y

x b Figure 10a-b : Von Mises stresses (a) calculated with a load of 143MPa on the internal points (b) between crack tip N. 1 and hole N. 4 (see Fig. 7d).

Iter.

a in

+da t

+r y

K eq

residual ligament da

r y





(MPa) (MPa)

(mm)

(MPa*mm 1/2 )

(mm)

(mm) (Irwin correction)

Crack Tip N.1

1

63 68 78 88 98

5

16.24 17.15

730 788 995

3.36 2.45

0 0

0

2 (yield.)

10 10 10 10 10 10 15 10 10 10 10 10 10 10 5

0.91

3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9

3.40 3.73 4.00 4.40 4.90 8.94 6.15 6.15 6.15 6.15 6.49 6.77 7.12

16.20 15.87 15.60 15.20 14.70 10.66 13.45 13.45 13.45 13.45 13.11 12.83 12.48 8.17

0.3 0.3 0.4 0.5 0.4 0.4 1.5

0 0 0 0 0

1111 1237 1364 1455 1522 1754

108 118 128 143

3.64 4.23

11.43

Crack Tip N. 2 - hole N. 10, right side

63 68 78 88 98

701 772 886

0 0 0

0 0 0 0 0 0 0

1000 1114 1227 1349 1474 1703

0.3 0.3 0.4 0.5 0.5 1.4

108 118 128 143

10.79 13.52

8.81 6.08

3.13 3.97

9 (yield.)

Crack Tip N. 3 - hole N. 15, left side

63 68 78 88 98

5

11.07 11.07 11.07 11.07 11.07 11.07 11.07 11.07 13.22

440 484 555 625 696 767 841 952

8.53 8.53 8.53 8.53 8.53 8.53 8.53 8.53 6.38

0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

10 10 10 10 10 10 15

108 118 128 143

0.3

1075

0.25

1.65

Table 1 : Crack advance vs. monotonic increasing load.

531