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Table 1 Composite excitation under different preloads

From: Competitive Failure of Bolt Loosening and Fatigue under Different Preloads

Preload

FT,a (mm)

FA,a (kN)

R (mm/kN)

Number of valid specimens

F0.3

0.5

10

0.05

3

0.6

0

-

4

0.6

2

0.3

3

0.6

3

0.2

3

0.6

4

0.15

4

0.6

6

0.1

3

0.6

8

0.075

3

0.6

10

0.06

3

0.8

8

0.1

3

0.8

10

0.08

3

F0.4

0.5

10

0.05

2

0.6

0

-

2

0.6

2

0.3

3

0.6

3

0.2

2

0.6

4

0.15

2

0.6

6

0.1

2

0.6

8

0.075

3

0.6

10

0.06

3

0.8

8

0.1

2

0.8

10

0.08

3

1.0

10

0.1

3

F0.5

0.5

10

0.05

3

0.6

0

-

4

0.6

2

0.3

4

0.6

3

0.2

3

0.6

4

0.15

5

0.6

6

0.1

3

0.6

8

0.075

4

0.6

10

0.06

4

0.8

8

0.1

3

0.8

10

0.08

3

F0.6

0.5

8

0.0625

3

0.6

0

-

2

0.6

2

0.3

5

0.6

4

0.15

5

0.6

6

0.1

3

0.6

8

0.075

3

0.6

10

0.06

3

0.8

8

0.1

3

0.8

10

0.08

3

  1. Note: FT,a is the transverse displacement amplitude, FA,a is the axial load amplitude, and R is the ratio of the transverse load to the axial load, R = FT,a/FA,a