PSI - Issue 47

Christoph Bleicher et al. / Procedia Structural Integrity 47 (2023) 478–487 Author name / Structural Integrity Procedia 00 (2019) 000–000

484

7

Fig. 7 Summary of the fatigue strength determined on the round axial samples for the three materials

Table 2. Results for the parameters of the SN curves determined from statistical evaluation.

Knee point N k (·10 5 ) [-]

Nominal stress amplitude σ a,n,Nlim at N lim [MPa]

Scatter band T σ [-]

Load ratio R σ

Material

Sample geometry

Material state

Number of specimens investigated

Slope k [-]

12 13 13 18 10 12 12 11 17 17 11 12 10 10 13 12 16 14 11 12

-1

9.5 5.6 5.4 5.6 6.4 7.4 3.2 3.8 6.5 9.3 4.9 6.3 7.3 5.9 9.4 6.7 7.6 7.2 8.6

10

157

1:1.23 1:1.13 1:1.44 1:1.38 1:1.17 1:1.13 1:1.51 1:1.39 1:1.16 1:1.20 1:1.22 1:1.29 1:1.11 1:1.11 1:1.36 1:1.62 1:1.12 1:1.29 1:1.55 1:1.38

Base material

0

3

99

Mean stress sensitivity M = 0.58

-1

30 10 10 20

98 67

Axial

Integral material state

0

Mean stress sensitivity M = 0.46

EN-GJS-400-18LT

-1

144 108

Base material

0

Mean stress sensitivity M = 0.33

-1

20

76 42

Base, heat-affected zone and welding filler

0

-

Bending

Mean stress sensitivity M = 0.81

-1

10 20 10 20 10 10

164 125

Base material

0

14.7

Mean stress sensitivity M = 0.31

-1

48 30

Axial

Integral material state

0

Mean stress sensitivity M = 0.60

EN-GJS-450-18

-1

140 112

Base material

0

Mean stress sensitivity M = 0.25

-1

- -

51 40

Base, heat-affected zone and welding filler

0

Bending

Mean stress sensitivity M = 0.28

-1

10 10 20 20

193 110

Base material

0

Mean stress sensitivity M = 0.75

EN-GJS-700-2

-1

126

Axial

Integral material state

0

75

Mean stress sensitivity M = 0.68