PSI - Issue 75

Ralf Glienke et al. / Procedia Structural Integrity 75 (2025) 474–488 Ralf Glienke et al / Structural Integrity Procedia 00 (2019) 000 – 000

484

11

a) #01, #02 R = 0.3

b) #03

c) #04

700

700

700

R = 0.44 - 0.5

 max = f y

500

500

500

k Imp,Ps=50% = 1.36

m BC /m = 1.95

R = 0.22

100 Direct stress range D [MPa]

100 Direct stress range D [MPa]

100 Direct stress range D [MPa]

R = 0.29

R = 0.36

R = 0.44

R = 0.44

R = 0.5

R = 0.5

188 169 137 111

fractures #01 run out #01

155

143 90 121 125

P s = 50%, m obs. = 3.7 P s = 95%, m obs. = 3.7 fractures #02 run out #02 R=0.3 run out #02 R=0.5 P s = 50%, m obs. = 7.2 P s = 95%, m obs. = 7.2

90 139 125

fractures #03 run out #03

90

P s = 50%, m obs. = 5.8 P s = 95%, m obs. = 5.8 fractures #03 pre-stressed run out #03 pre-stressed

fractures #04 run out #04

P s = 50%, m obs. = 4.2 P s = 95%, m obs. = 4.2

50

50

50

10 4

5×10 6

10 4

5×10 6

10 4

5×10 6

100000

100000

1000000

Fatigue life N [-]

100000

1000000

1000000

Fatigue life N [-]

Fatigue life N [-]

e) #07, #08 R = -1

d) #05, #06 R = 0.3

700

f ) #09, #10 R = 0.1 k Imp,Ps=50% = 1.31

700

700

k Imp,Ps=50% = 1.10 381 373 345 329 m BC /m = 1.52

500

500

500

k Imp,Ps=50% = 1.26

m BC /m = 3.50

m BC /m = 1.69

100 Direct stress range D [MPa]

100 Direct stress range D [MPa]

100 Direct stress range D [MPa]

304 293 231 206 160 125

fractures #09 run out #09

164

160 125

P s = 50%, m obs. = 5.3 P s = 95%, m obs. = 5.3 fractures #10 run out #10 P s = 50%, m obs. = 18.6 P s = 95%, m obs. = 18.6 fractures #10 pre-stressed run out #10 pre-stressed

fractures #05 run out #05

130 139

fractures #07 P s = 50%, m obs. = 14.1 P s = 95%, m obs. = 14.1

P s = 50%, m obs. = 3.9 P s = 95%, m obs. = 3.9 fractures #06 run out #06 P s = 50%, m obs. = 6.6 P s = 95%, m obs. = 6.6

119 | (125-red)

116

fractures #08 run-outs #08

85 (90-red)

P s = 50%, m obs. = 21.4 P s = 95%, m obs. = 21.4

50

50

50

10 4

5×10 6

10 4

5×10 6

10 4

5×10 6

100000

1000000

100000

1000000

Fatigue life N [-]

10 5 Fatigue life N [-]

10 6

Fatigue life N [-]

i) #15, #16 R = -1

g) #11, #12 R = -1

h) #13, #14 R = -1

700

700

700 1000 Direct stress range D [MPa]

k Imp,Ps=50% = 1.15 414 402 360 m BC /m = 1.70

k Imp,Ps=50% = 1.03 m BC /m = 1.16

k Imp,Ps=50% = 1.12 m BC /m = 0.92

500

500

385

348 374

506

338

307 453 412

100 Direct stress range D [MPa]

100 Direct stress range D [MPa]

180

180

fractures #11 run out #11

fractures #13 run out #13

fractures #15 run out #15

180

P s = 50%, m obs. = 13.1 P s = 95%, m obs. = 13.1 fractures #12 run out #12

P s = 50%, m obs. = 9.5 P s = 95%, m obs. = 9.5 fractures #14 run out #14 P s = 50%, m obs. = 11.1 FKM-Guideline ( D D = 365.13 N/mm 2 , k

P s = 50%, m obs. = 4.9 P s = 95%, m obs. = 4.9 fractures #16

100

P s = 50%, m obs. = 4.5 P s = 95%, m obs. = 4.5 FKM-Guideline ( D D = 507.56 N/mm 2 , k

P s = 50%, m obs. = 22.2 P s = 95%, m obs. = 22.2 FKM-Guideline ( D D = 302.59 N/mm 2 , k

 = 15)

 = 15)

 = 15)

50

50

50

10 4

5×10 6

10 4

5×10 6

10 4

5×10 6

100000

1000000

100000

1000000

Fatigue life N [-]

10 5 Fatigue life N [-]

Fatigue life N [-]

10 6

l)

100% f y,obs K t = 2.56

j) #17, #18 R = 0.1

k) #19, #20 R = 0.1

700

700

500

#03 D = 140 N/mm² #10 D = 200 N/mm²

100 200 300 400

500

500

100% f y,obs

N = 50

k Imp,Ps=50% = 0.90

k Imp,Ps=50% = 0.95

100 Direct stress range D [MPa]

100 Direct stress range D [MPa]

R = 0.05

m BC /m = 0.95

D



m BC /m = 1.31

 N [N/mm²]

R = 0.31

0% f y,obs K t = 2.36

R = 0.22

210 199

168

0% f y,obs

Number of cycles N [-]

189 177

R = 0.4

fractures #19 run out #19

−500 −400 −300 −200 −100 0 Prestress  [N/mm²]

fractures #17 run out #17

160 |

10 5

2×10 6

10 7

159

10 6

R = 0.5

P s = 50%, m obs. = 6.3 P s = 95%, m obs. = 6.3 fractures #19 R = var. run out #19 R = var. fractures #20 run out #20 P s = 50%, m obs. = 8.3 FKM-Guideline ( D D = 130.24 N/mm 2 , k

Fatigue life N [-]

P s = 50%, m obs. = 10.7 P s = 95%, m obs. = 10.7 fractures #18 run out #18

90

90

80% f y,obs

85% f y,obs K t = 2.75

P s = 50%, m obs. = 10.2 P s = 50%, m obs. = 10.2 FKM-Guideline ( D D = 142.14 N/mm 2 , k

95% f y,obs

83% f y,obs K t = 2.07 90% f y,obs 92.5% f y,obs

100% f y,obs

 = 5)

 = 5)

90% f y,obs K t = 2.72

92.5% f y,obs K t = 2.09

50

50

10 4

5×10 6

10 4

5×10 6

10 5 Fatigue life N [-]

10 5 Fatigue life N [-]

10 6

10 6

Fig. 7. S-N diagrams from fatigue tests on transverse loaded butt-welds, thermal cut edges, base materials and flat bars with central hole