SUNBOW
Home> Blog >UIT >article
HJ-series UIT cases and data(Fatigue Data)
Updating Time:2010-5-27 9:38:31 Hits:

Part One Fatigue Data

1.      Q235B

Comparison before and after UIT on butt-joint seam

No.

State

Fatigue life

N×10-6/r

Fracture Location

Stess   σ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture Location

Stress

σ/MPa

1

As welded

2.752

Toe zone

160

11

UIT

1.199

Toe zone

265

2

As welded

1.885

Toe zone

170

12

UIT

0.816

Toe zone

270

3

As welded

1.645

Toe zone

175

13

UIT

0.448

Base metal

270

4

As welded

1.415

Toe zone

180

14

UIT

0.483

Toe zone

280

5

As welded

0.721

Toe zone

190

15

UIT

0.278

Toe zone

290

6

As welded

0.546

Toe zone

210

16

UIT

1.836

Base metal

265

7

As welded

0.328

Toe zone

230

17

UIT

0.888

Base metal

270

8

UIT

3.996

Toe zone

250

18

UIT

0.848

Base metal

270

9

UIT

3.210

Base metal

255

19

UIT

0.533

Base metal

270

10

UIT

1.848

Toe zone

260

20

UIT

0.443

Base metal

270

 

Comparison before and after UIT on cruciform-joint seam

No.

Group

Fatigue life

N×10-6/r

Fracture Location

Stress  σ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture Location

Stress

σ/MPa

1

As welded

2.605

Toe zone

183

11

UIT

1.538

Toe zone

319

2

As welded

1.875

Toe zone

198

12

UIT

1.28

Toe zone

334

3

As welded

0.874

Toe zone

214

13

UIT

0.611

Base Metal

334

4

As welded

0.532

Toe zone

244

14

UIT

0.645

Toe zone

349

5

As welded

0.301

Toe zone

274

15

UIT

0.387

Toe zone

364

6

UIT

3.320

Toe zone

304

 

 

 

 

 

 

Comparison of fatigue life before and after UIT

Joint style

State

Stressσ/MPa

Fatigue life  N×10-6/r

Butt joint

As welded

253

0.165

Butt joint

UIT

253

10.0

Cruciform joint

As welded

281

0.24

Cruciform joint

UIT

281

10

 

Comparison of fatigue strength before and after UIT

Joint style

Fatigue strength(σ/MPa)

Increase(/%)

As welded

UIT

Butt joint

149

235

57

Cruciform joint

143

234

64

Cruciform joint(R0.5)

168

288

71

 

2.      16Mn

Comparison of butt-joint seam before and after UIT

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress  σ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

σ/MPa

1

As welded

2.969

Toe zone

165

7

UIT

1.570

Toe zone

320

2

As welded

1.633

Toe zone

172

8

UIT

1.220

Base metal

330

3

As welded

0.846

Toe zone

190

9

UIT

0.450

Toe zone

340

4

As welded

0.607

Toe zone

210

10

UIT

0.174

Toe zone

350

5

As welded

0.402

Toe zone

230

11

UIT

0.114

Toe zone

360

6

UIT

2.401

Base metal

310

 

 

 

 

 

 

Comparison of cruciform-joint before and after UIT

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stressσ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

σ/MPa

1

As welded

3.640

Toe zone

140

6

UIT

0.137

Toe zone

290

2

As welded

2.607

Toe zone

145

7

UIT

0.420

Toe zone

270

3

As welded

1.537

Toe zone

150

8

UIT

0.872

Toe zone

260

4

As welded

0.816

Toe zone

170

9

UIT

1.546

Toe zone

250

5

As welded

0.393

Toe zone

210

10

UIT

2.454

Toe zone

240

 

Comparison of fatigue life before and after UIT

Joint style

State

Stress

σ/MPa

Fatigue life

N×10-6/r

Butt-joint

As welded

281

0.104

Butt-joint

UIT

281

10.0

Cruciform-joint

As welded

207

0.298

Cruciform-joint

UIT

207

10.0

 

Stress concentration factor

Joint style

State

Knuckle radius

Efficient stress concentration factor

ρ/mm

Butt-joint

As welded

0.2

0.104

Butt-joint

UIT

1.6

10.0

Cruciform-joint

As welded

0.4

0.298

Cruciform-joint

UIT

2.0

10.0

 

Comparison of Fatigue strength before and after UIT

Joint style

Fatigue strength(/MPa)

Increase(/%)

As welded

UIT

Butt-joint

150.5

286

90

Cruciform-joint

132

220.5

67

3.      Varying-amplitude load

a)         Q235

Comparison of fatigue life

State

Constant-amplitude

Varying-amplitude

As welded

UIT

As welded

UIT

Stress(σ/MPa)

189

189

182

182

Fatigue life(N×10-6/r)

0.20

4.40

0.4

2.27

Stress(σ/MPa)

177.0

177.0

163.5

163.5

Fatigue life(N×10-6/r)

0.275

10.000

0.560

10.000

 

Comparison of fatigue strength(2×106)

State

Constant-amplitude

Varying-amplitude

As welded

UIT

As welded

UIT

Fatigue strength(σ/MPa)

117

200

109

184

Increase(/%)

71

69

 

b)        16Mn

Comparison of fatigue life

State

Constant-amplitude

Varying-amplitude

As welded

UIT

TIG dressing

As welded

UIT

TIG dressing

Stress(σ/MPa)

 

227

 

 

203

 

Fatigue life(N×10-6/r)

0.20

0.47

0.50

0.40

1.39

.075

Stress(σ/MPa)

 

189

 

 

178

 

Fatigue life(N×10-6/r)

0.372

10.0

0.925

0.57

10.0

1.13

 

 

Comparison of fatigue strength(2×106)

State

Constant-amplitude

Varying-amplitude

As welded

UIT

TIG dressing

As welded

UIT

TIG dressing

Fatigue strength(σ/MPa)

115

212

158

110

198

147

Increase(/%)

84

37

80

34


4.       LF21

Comparison of Cruciform-joint(R=0.5)

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

MPa

1

As welded

3.474

Toe zone

29

6

UIT

0.483

Toe zone

56

2

As welded

2.466

Toe zone

34

7

UIT

0.743

Base metal

52

3

As welded

1.300

Toe zone

38

8

UIT

0.816

Toe zone

50

4

As welded

0.383

Toe zone

47

9

UIT

1.654

Toe zone

44

5

As welded

0.345

Toe zone

54

10

UIT

2.896

Toe zone

40

 

Comparison of T joint(R=0.1)

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

MPa

1

As welded

0.60

Toe zone

84

7

UIT

0.275

Toe zone

112

2

As welded

0.273

Toe zone

122

8

UIT

0.679

Toe zone

105

3

As welded

1.80

Toe zone

72

9

UIT

1.047

Toe zone

100

4

As welded

4.15

Toe zone

63

10

UIT

1.453

Toe zone

97

5

As welded

0.910

Toe zone

84

11

UIT

2.745

Toe zone

93

6

As welded

1.37

Toe zone

76

 

 

 

 

 

 

Comparison of T joint(R=-1)

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

MPa

1

As welded

1.069

Toe zone

72

7

UIT

0.426

Toe zone

116

2

As welded

3.45

Toe zone

68

8

UIT

1.589

Toe zone

100

3

As welded

0.3

Toe zone

100

9

UIT

0.662

Toe zone

107

4

As welded

0.74

Toe zone

84

10

UIT

5.389

Toe zone

95

5

As welded

0.5

Toe zone

92

11

UIT

0.603

Toe zone

112

6

As welded

0.79

Toe zone

77

 

 

 

 

 

 

Comparison of fatigue strength

Joint style

State

应力比

Fatigue strength(/MPa)

Increase(/%)

T joint

UIT

R=-1

101

44

 

As welded

R=-1

70

T joint

UIT

R=0.1

96

37

 

As welded

R=0.1

70

Cruciform-joint

UIT

R=0.5

42

26

 

As welded

R=0.5

34

 


5.       SS800 high-tensile steel

Comparison of different methods

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stressσ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

σ/MPa

1

TIG dressing

0.398

Dressing Toe zone

266

7

UIT

3.182

Toe zone

285

2

TIG dressing

0.347

Dressing Toe zone

247

8

UIT

1.907

Base metal

295

3

TIG dressing

1.024

Toe zone

228

9

UIT

1.062

Toe zone

304

4

TIG dressing

1.287

Dressing Toe zone

219

10

UIT

0.584

Toe zone

314

5

TIG dressing

0.687

Toe zone

205

11

UIT

0.160

Toe zone

352

6

TIG dressing

2.018

Dressing Toe zone

200

 

 

 

 

 

 

Comparison of Fatigue life

State

Stress

σ/MPa

Fatigue life

N×10-5/r

Stress

σ/MPa

Fatigue life

N×10-5/r

As welded

340

0.5

261

1.59

UIT

340

2.3

261

100

TIG dressing

340

0.68

261

3.7

TIG dressing+ UIT

340

14.5

261

200

 

Increase of fatigue strength(2×106)

State

As welded

TIG dressing

UIT

TIG dressing +UIT

Fatigue strength(σ/MPa)

150

163

282

315

Increase(/%)

68

190

225

 

Increase of fatigue strength(2×106)

Joint style

Fatigue strength(σ/MPa)

Increase(/%)

As welded

UIT

Double welded butt-joint

150

293

95

single welded butt-joint

132

307

132

Endwise corner joint

98

267

173

Comparison of fatigue life

Joint style

State

Stress

σ/MPa

Fatigue life

N×10-5/r

Stress

σ/MPa

Fatigue life

N×10-5/r

Single welded Butt-joint

As welded

268

1.0

286

0.75

 

UIT

268

49

286

100

Double welded Butt-joint

As welded

290

1.0

261

1.59

 

UIT

290

22.5

261

100

Endwise corner joint

As welded

255

1.0

229

1.4

 

UIT

255

33

229

100


6.       BT20 Titanium alloy

Comparison of fatigue life

State

Stressσ/MPa

Fatigue life N×10-5/r

Stress σ/MPa

Fatigue lifeN×10-5/r

As welded

256

1.0

235

2.5

UIT

256

29

235

100

As welded

323

1.0

224

10.7

UIT

323

3.05

224

100

Comparison of fatigue strength (2×106)

State

TIG

Electron beam welding

As welded

UIT

As welded

UIT

Fatigue strength(σ/MPa)

204

260

192

265

Increase(/%)

27

38

 7.      X65 pipe steel

Comparison of fatigue life

State

Stressσ/MPa

Fatigue life N×10-5/r

Stressσ/MPa

Fatigue life N×10-5/r

As welded

381

1.0

254

9.3

UIT

381

1.85

254

100

 8.      20# steel T-joint

Comparison of fatigue life

Attribute Style

State

Stressσ/MPa

Fatigue life

N×10-5/r

Stress

σ/MPa

Fatigue life

N×10-6/r

热点应力

As welded

446

1.0

172

1.65

UIT

446

4.8

172

10

名义应力

As welded

131

1.0

49

2.0

UIT

131

4.7

49

10

 

9.      After UIT

UIT results (R0.1)

No.

Group

Fatigue life

N×10-6/

Fracture location

Stressσ/MPa

No.

Group

Fatigue life

N×10-6/

Fracture location

Stress

σ/MPa

1

Heat procession

0.123

Toe zone

245

7

Without heat procession

3.464

Base metal

189

2

Heat procession

0.362

Toe zone

230

8

Without heat procession

1.897

Base metal

198

3

Heat procession

0.624

Toe zone

217

9

Without heat procession

1.358

Base metal

207

4

Heat procession

1.472

Toe zone

205

10

Without heat procession

1.105

Toe zone

216

5

Heat procession

3.282

Toe zone

195

11

Without heat procession

0.585

Toe zone

225

6

Without heat procession

10.17

Not break

180

 

 

 

 

 

UIT results(R-1)

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stressσ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

σ/MPa

1

Heat procession

1.676

Base metal

295

7

Without heat procession

2.014

Base metal

280

2

Heat procession

1.185

Base metal

303

8

Without heat procession

1.430

Base metal

300

3

Heat procession

0.867

Base metal

315

9

Without heat procession

1.045

Toe zone

300

4

Heat procession

0.456

Toe zone

330

10

Without heat procession

0.647

Toe zone

320

5

Heat procession

0.429

Toe zone

350

11

Without heat procession

0.498

Toe zone

340

6

Without heat procession

2.997

Base metal

270

 

 

 

 

 

UIT results(R0.45)

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stressσ/MPa

No.

Group

Fatigue life

N×10-6/r

Fracture location

Stress

σ/MPa

1

Heat procession

0.253

Toe zone

188

6

Without heat procession

0.371

Toe zone

188

2

Heat procession

0.411

Toe zone

180

7

Without heat procession

0.507

Toe zone

179

3

Heat procession

0.641

Toe zone

171

8

Without heat procession

1.001

Toe zone

170

4

Heat procession

1.189

Toe zone

165

9

Without heat procession

1.434

Toe zone

161

5

Heat procession

2.299

Toe zone

157

10

Without heat procession

3.989

Toe zone

152

  

 


 
Site Map | Contact Us | About SUNBOW | Links
Copyright © Sunbow Technology 2007-2010 All rights reserved.