Table 3 Parameters for determination of fatigue safety factors by sections.

From: Calculating the fatigue strength of load-bearing structures of special self-propelled rolling stock

 

No. sections

1

1′

2

2′

2′′

3

3′

4

Kσ

1.2

1.2

1.17

1.17

1.17

1.2

1.2

1.41

K′σD

2.87

2.87

2.8

2.8

2.8

2.87

2.87

3.37

σT/σms – 1/K′σD

0.43

0.43

0.44

0.44

0.44

0.43

0.43

0.36

θσ

1

1

1

1

1

1

1

1

Before modernization

 σst max. MPa

91.57

132.4

35.1

48.5

23.25

127.15

41.6

75.6

 σst. MPa

22.8

39.97

31.9

33.9

21.45

36.25

32.25

35.1

After modernization

 σst max. MPa

67.05

102.0

26.75

40.3

22.98

127.15

41.6

75.6

 σst. MPa

20.95

25.56

24.13

28.3

21.1

36.5

32.25

35.1

  1. \(\psi_{\sigma }\) is the coefficient characterizing the influence of average cycle stress on the limit amplitude; \(\sigma_{st}^{II}\) is the static stress from the body gravity force.
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