Crack Paths 2009

1E-8

1E-9

1E-10

II - top (L)

II - bottom (L)

1E-11

II - top (S)

II - bottom (S)

III - front (L)

d

1E-12

III - back (L)

III - front (S)

III - back (S)

1E-13

4

8

10 12

6

ΔK[MPa.m1/2]

Figure 6. The crack growth curves for the austenitic steel in the near-threshold region.

1E1E--1910

3

II - top

d

II-bottom II fbroanck

1E-132

1

2

ΔK[MPa.m1/2]

Figure 7. The crack growth data for the ferritic steel close to the fatigue threshold.

The experimental data obtained from the top and bottom sides of specimens do not

exhibit a systematic deviation. This confirms that the influence of bending loading can

be considered to be negligible.

591