Fatigue Crack Paths 2003

da

)n

(

(8)

th N K x K dN Δ − Δ = ) , ( σ

The values for the constants are the values found in [3], [4] for a steel AISI 4140 grade

E:

ΔKth = 3 M P a m, C = 8.888 10-4 , n = 1.92657

1,E-01

a 55VM4

1,E-02

/cycle )

c 55VM4

1,E-03

a 80VG9

( m m

c 80VG9

1,E-04

d 80VG9

d a / d N

1,E-05

1,E-06

1,E-07

1

10

100

ΔΔK ( MPa*m^(1/2))

Figure 10. F C Galong Δ Kfor Pin component.

50

40

^1/2 )

30

m

Pa*

K I ( M

20

10

0

0

5

10

15

20

a(mm)

B O X

PIN

Figure 11. KI Boxand Pin along a.