Issue 42

M. Kowalski, Frattura ed Integrità Strutturale, 42 (2017) 85-92; DOI: 10.3221/IGF-ESIS.42.10

w,

H,

Stress, MPa

N exp , cycles

Specimen

Fa, kN

mm

mm

σ ti

σ int

σ st

P01

10

9

24

155.3

233.0

326.2

6650

P02

10

9

21.5

139.2

208.7

292.2

98310

P03 P04

9.7

9

19.9

132.8 154.5

199.2 231.8

278.9 324.6

895970

9.62

9.02

23

34390

P05

9.54

8.74

24.5

169.1

253.6

355.0

26570

P06

9.46

8.96

22

150.9

226.4

316.9

104820

P07

9.76

9.02

23.1

153.0

229.5

321.3

22980

P08

9.84

9

21.1

138.8

208.2

291.5

134850

P09 P10

9.7 9.7

9.08

23.1 19.6

153.3 130.8

230.0 196.2

322.0 274.6

28860

9

263540

P11

9.82

9

21

138.4

207.6

290.7

117640

P13

10.08

9.08

25

159.7

239.6

335.4

132600

P14

9.9

9

25

163.4

245.2

343.2

195050

P15

9.85

8.93

28

184.8

277.2

388.1

31100

P16

9.85

8.93

30

198.0

297.0

415.9

9100

P17

9.85

8.85

33

219.0

328.5

459.8

2710

where: w, h –specimen section dimensions , σ ti

– stress in titanium layer, σ int

– stress in interface zone, σ st

– stress in steel layer F a

– force amplitude.

Table 3 : Results of the fatigue tests.

Figure 7 : Hysteresis loops recorded during fatigue tests.

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