JB/T 4291-1999 JB/T 4291-1999 Test method for crack opening displacement (COD) of welded joints JB/T4291-1999 Standard download and decompression password: www.bzxz.net

JB/T 4291-1999
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Preface
This standard is a revision of JB 4291-86 "Crack Opening Displacement (COD) Test Method for Welded Joints". During the revision, editorial changes were made to the original standard, and its main technical content remained unchanged. This standard replaces JB4291-86 from the date of implementation. This standard is proposed and administered by the National Welding Standardization Technical Committee. The unit responsible for drafting this standard: Harbin Welding Research Institute. The main drafters of this standard: Zheng Benhe, Zhou Wei Yu, Lu Qichu, Liu Congmin, and Wang Lanru. This standard was first published in 1986, and this revision is the first revision. 258
Machinery Industry Standard of the People's Republic of China
Test method of crack opening displacement in welded joints (COD) Test method of crack opening displacement in welded joints1 Scope
This standard specifies the melting of metal materials Test method for crack opening displacement of welded joints. JB/T4291--1999
replaces JB 4291--86
The test methods specified in this standard are suitable for ductile fracture situations where linear elastic fracture mechanics fails. The COD value of crack initiation or instability measured in the test can be used for: fracture resistance design and safety assessment of the welded structure, relative assessment of the welding materials, and relative assessment of the quality of the welding process.
2 Reference standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. The editions indicated were valid at the time of publication of this standard. All standards are subject to revision and parties using this standard should explore the possibility of using the latest edition of the following standards. GB/T228-1987 Metal Tensile Test Method
3 Definitions and Symbols
3.1 Definition
3.1.1 COD
refers to the elastic-plastic body working type (Zhang Open type) load, the abbreviation of the opening displacement of the original crack site, the symbol is の. It is a fracture mechanics parameter that describes the state of the cracked body. The COD value corresponding to the crack tip located in the weld metal of the welded joint is represented by the symbol, the COD value corresponding to the crack tip located in the fusion zone is represented by the symbol F: the COD value corresponding to the crack tip located in the heat affected zone is represented by the symbol H, corresponding to The COD value where the crack tip is located in the base material that is not subject to the welding thermal cycle is represented by a symbol. 3.1.2 Characteristic COD value
refers to the COD value corresponding to crack initiation, instability or maximum load point. These characteristic COD values ??can be measured according to this standard. They characterize the material's ability to resist cracking and propagation.
3.1.2.1 The crack opening displacement corresponding to the starting point of the slow crack expansion is called the crack initiation COD value, the symbol is 3: The COD value corresponding to the slow crack expansion amount Aα-0.05mm is called the conditional crack initiation COD The value, the symbol is 0.05 + the COD value corresponding to the high saturation of the stretching zone is called the shot and cracking COD value. The symbol is.
3.1.2.2 The COD value corresponding to the occurrence of brittle instability fracture or burst behavior without stable crack expansion is called the brittle crack initiation COD value, and the symbol is 3. ; The iCOD value corresponding to the stable crack expansion that has occurred before the unstable fracture or sudden progression behavior is called the cerebral instability COD value, and the symbol is.
3.1.2.3 The COD value corresponding to the maximum load point or the starting point of the maximum load platform is called the maximum load COD value, and the symbol is 3m. 3.1.3COD resistance curve
The COD value corresponding to a certain crack expansion is called the COD resistance value, with the symbol R. The relationship curve with the crack expansion Aa is called the COD resistance curve, referred to as the curve.
3.2 symbol
B——-Sample thickness, mm;;
Nanjia Machinery Industry Bureau approved 1999-06-24 2001-01-01 Sale
259
W
-sample width, mm;
JB/T 4291-1999
test plate thickness of structure or simulated structure, mmag starting notch length, mm
—the total length of the crack (or notch), mm;—the three-point bending loading span, mm
S
The total length of the L specimen, mm;
Aa-——stable crack growth, mm,
E——elastic modulus, N/mm2;
Poisson’s ratio,
d
K,|| tt||Kiran x
The service strength of the material at the test temperature is 6. or g.2, N/mm*, Type I stress field intensity factor, N/mm2,
Fatigue during prefabricated cracks Maximum value of stress field intensity factor, N/nmaz; Y (a/W) - sample geometry factor;
Pmar - maximum value of fatigue load when prefabricated cracks, N, Pimin
R
P
The minimum value of fatigue load when prefabricating cracks, N; during the fatigue cycle, the ratio of the minimum value to the maximum value of load, Di, R Phmin/Pfmr
Test load N ;
The load value when the PP-V curve begins to deviate from linearity, N; P.--the test stop point load.N;
P
Pi.
Pmax
Applied load at the starting point of slow crack expansion, N; Limited load of the specimen, N;
For three-point Li Qu specimen:
B
PL=1. 456×No.
(wa)\a
Maximum test load, N;
Clamp-type extensometer opening displacement measured on a crack mouth, mm; V.--the opening displacement of the clamp-on extensometer at the cracking point, mm, Vt--the opening displacement of the clamp-on extensometer at the test stop point, mm, Pmx
-the maximum load or the starting point of the maximum load platform The corresponding opening displacement of the clamp-on extensometer, mm; Vp - the plastic part of the opening displacement of the clamp-on extensometer, mmrp-
- the rotation factor of the plastic deformation stage of the sample;: Z - coming extensometer The distance from the mounting part to the specimen surface, mmA - the dispersion value expressed as the remaining standard deviation, mn. 4 Overview of test methods
This standard specifies the use of single-sided notched three-point bending specimens with prefabricated cracks for COD testing. First, weld joint (including weld metal, fusion zone, heat affected zone, base metal) specimens are prepared from the inspected welding test plate or welded structure, and combined sharp joints including fatigue cracks are prepared on the specimens. gap. Then, perform three-point bending loading and record the PV curve. Finally, the specified calculation formula is used to convert the crack mouth opening displacement of the selected point on the PV curve into the corresponding crack tip opening displacement. In the experiment, physical monitoring methods such as potential method, metallographic profile method, resistance curve method, etc. were used to obtain characteristic COD values. 260 | | tt | ?
ff
2W+10
. 2W+10
0M
a)
A
一
0.1%w
0.2%w
B ±0.005W
Thickness: B, Width: W=2B Loading distance?S=4W Average crack length: a-(0.45～0.55)WM9000Tm
h
Tim: 2W +10
2w+0
B± 0.005W
b)
?
A
0.1%wA||tt| |(. 2%w
Thickness: B, Width: W=B Loading distance: S=4W; Average crack length: a=(0.25～0.55)W Figure 1
5.2 Various When determining the notch position of the specimen, metallographic corrosive agent must be used to reveal the weld contour. 5.2.1 For specimens used for fracture resistance design and safety assessment of welded structures, in principle, the original plate thickness test shall be used. The sample should be taken from the actual welded structure or a test plate that can simulate the actual structure in terms of metallurgy and technology. The position, orientation and expansion direction of the prefabricated cracks on the sample should simulate the actual defects. 5.2.1.1 The weld sample is shown in the figure. 2. When the longitudinal defects in the weld expand along the thickness of the weld, the sample in Figure 2a) is used. When the longitudinal defects in the weld expand along the longitudinal direction of the weld, the sample in Figure 2b) is used. The transverse defects in the weld extend along the thickness of the weld. For square expansion, the sample in Figure 2c) is used. 5.2.1.2 See Figure 3 for the sample in the fusion zone.
5.2.1.3 The heat-affected zone sample is shown in Figure 4.
5.2.2 The fracture toughness specimens used for quality assessment of welding materials and welding processes are shown in Figure 5. The prefabricated crack tips of the specimen should be located at the corresponding positions of the weld metal, fusion zone or heat-affected zone. For multi-layer and multi-pass welding metal samples, the tip of the prefabricated crack should fall in the columnar crystal area of ??the weld metal. The thermal simulation specimen used for the fracture toughness evaluation of the heat-affected zone of welded joints is shown in Figure 6. In order to evaluate the fracture toughness of the weld toe area, shallow notch specimens can be used, see Figure 7. When used to screen welding materials and select welding process specifications, line notch samples can also be used instead of crack samples.
5.3 Number of specimens
5.3.1 To measure the characteristic COD value of the specified area of ??the welded joint, there should be no less than 3, and the notch tip position accurately falls on the effective test area of ??the tested area. Sample. When the data dispersion is greater than 15%, the number of valid samples cannot be less than 5. 1
.262
JB/T 42917999
Width: W=B=t;Thickness B:
Structural or simulated structure test plate thickness:;||tt ||Average grain length: 4=(0.25~0.55)W plus cutting span: S=4W
a)
Width: W=2B=2tThickness: B
Structure or simulated structure test plate thickness: tt
Average crack length: α-(0.450.55)W loading span; S=4W
6)
Width, W=B 2t+Thickness: B
Structure or simulated structure test plate thickness: t
Average crack length: α=(0.25～0.55)W; Loading span: S=4W
Fig. 2
Width: W=B=tThickness: B:
Tree or simulated structure test plate thickness: t
Average crack length a=(0.25~0.55)W|| tt||Loading span: S=4W
a)
Width: W=B=+Thickness: B
Structural or simulated structure test plate thickness: t!||tt ||Average crack length: a=(0.25~0.55)W; Loading span: S=4W
a)
JB/T 4291—1999
Width: W=2B =2t; Thickness, B,
Structure or simulated structure test plate thickness t
Average crack length: a=(0.45~0.55)W; Add spine span; S= 4W||tt| |b)
Figure 3
Width: W=2B-2t;Thickness: B;
Structural or simulated structure test plate thickness: t;
Average crack length ;Q=(0.45-0.55)W, loading span: S=4W
b)
Figure 4
263
+264
JB /T 4291—1999
e)
Width.W;
When plate thickness: t<20mm, W=B,
Recommended: W=B= 14mm.
When plate thickness=20mm, W2B
recommended: W=2B=28mm.
Thickness B,
Test plate thickness: t
Figure 5
t
Aa
10±0.10
Figure 6
I
t
H心年
Y(
b)
d)
width. W2B
Thickness: BB=t/2;
Average crack length ra=2.5mmz
Added pitch; S=4W
Plate thickness,||tt ||a)
JB/T4291—1999
H
Figure 7
5.3.2 When using the resistance curve method to find 5;, 5 to 8 should be used Valid sample. 5.4 Machining of mechanical notch
5.4.1 The processing requirements for the initial mechanical notch using fatigue crack specimens are width: W=Bt
thickness; B
average crack length: α= 2.5mm
Loading distance: S=4W
b)
can be cut with wires with a diameter not exceeding 0.15mm. When the length of the machined part of the notch exceeds 2.5mm, a combined notch (that is, a combination of a milling notch and a line notch) can be used. It is required that the envelope line from the fatigue crack tip to the notch surface does not exceed 30°. Length α≤a-2mm (see Figure 8a). 5.4.2 The processing requirements for specimens using machined fine notches can be cut with molybdenum wire wires with a diameter not exceeding 0.08mm. When the gap length exceeds 2.5mm, a combined gap can be used. It is required that the envelope line from the notch tip to the notch surface does not exceed 30°, and the total length of the notch is, see Figure 8b). on
Integral knife edge
5.5 fatigue crack prefabrication
a)
30
Paste knife edge
Overall is mouth
.Figure 8
5.5.1 Loading span S-4W during fatigue crack prefabrication. 5.5.2 The stress ratio R should be in the range of 0~0.2. 5.5.3 During the entire process of fatigue crack prefabrication, it should be ensured that Pm meets the requirements of equation (1) and equation (2): Pmar≤0.5PL
Pimr
where: Y is a/ The functions of W are listed in Table l. -0.01EBVW
b)
Paste Naikou
(1)
(2)
5.5.4 The length of fatigue cracks should not be less than 2.0 mm. For the sample with W=2B, the total crack length after crack prefabrication should comply with = (0.45~0.55)W. For the specimen with W=B, the total crack length after fatigue crack prefabrication should comply with a-(0.25~0.55)W. 269
a/w
0.250
.0.260
0.240
0.280
0.290
0.300||tt| |0.310
0.320
0.330
0.340
0.350
1:0.360
10.370
0.380||tt| |0.390
0.400
0.410
0.420
0*430
0.440
0.450
0.460||tt| |0.470
0.480
0.490
0.500
0.510
0.520
0.530
0.540
266
0.000
5. 36
5.51
5.65
5.80
5.96
6.11
6.27
6.44
6.61
6.78
6.96
7.14
7.33
7.53
7.73|| tt||7.94
8. 16
8.39
8.63
8.88
9.14
9.41
9.69|| tt||9.98
10.30
10.62
10.96
11.32
11.70
12.10
0.001||tt| |5. 38
5.52
5.67
5.82
5. 97
6.13
6. 29
6.45
6.62
6.80
6.97
7..16
7.35
7.55
7 75||tt| |7.97
8. 19
8.42
8. 65
8.90
9.16
9.43
9.72|| tt||10.02
10.33
10. 65
11.00
11.36
11.74
12.14
0.002
5.39
5.54
5.68
5.83
E
6.30
.h :
6.81
6.99
7.18
7.37
7.57
7.77
7.99
8.21| |tt||8.44
6
8. 93
9.19
9.46
9. 75
10.05
10.36
10.69
11.03
11.40
11.78
12.19
JB/ T4291-1999
表1
0.003
5.41
5.55
5.70
5. 85
.1f
32
6. 66
6.83
7.01
7.20
7.39
7.59
7.79
8.01
8.23| |tt||8.
46
80
8.95
9.22
9.49
9.78
10.08|| tt||10.39
10.72
11.07
11. 43
11.82
12.23
0.004
5.42
5.57
5.71
5.86
6: 02
6. 34
hl
6. 67.
6.85
7.03
7.22
7.41
7.61
7.82
8.03
8.25
49
73
8.98
9.24
9.52
10.11
[0.42
10.76| |tt||11. 10
4
11.86
12.27
0.005
5.43
5.58
5.73
.83
6. 35
6. 69
6.87
7.05
7.24
7.43
7.63
了
8. 05
8. 28||h||8.51||h||8. 75
9.27
9.55
9.84
10. 14
F
10. 79
11.14
11.90
12.31
0.006
5.45
5.59
5.89
5.
6. 21
5.37
6.54
6.71
6.88
7.07
7.25
7.45
7.65| |tt||7..86
8. 07
8.30
B.53
81
9.03
9.30
9.57
9.86
10.17
10. 49
10.82
11.18
11.55
11.94
12.35
0.007
5.46
5.61| |tt||5.76
5. 91
6.07
6.22
6.39
6. 55
6.73
6.90
7. 09
7.27
7: 47
7.67
7.88
8, 10
8.32
8. 56
容. 80
9. 06
9. 32
9.60
9.89
10.20
10.52
10.86
11. 21
11.59
11.98
12.40
0.008
5.48
5, t2
5.77
5.93
6.08
6.40
6.57
6.74
6.92
7.10
7.29
7.49| |tt||7.69
7.90
8. 12
XF
8.58
8.-83
9.08
9.35
9.63
9.92||tt| |10.23||h||10.55||h||10.89||h||11. 25
11. 62
12.02
12.44
0.009
5.49
5.64
5.79
5.94
6.10.
6. 26.
6.42
6.59
6.76
6.94
7.12
7.31
7. 51
7.71
7.92
8.14
8.37
85
4.11
9. 38
9.66
9.95
10.26
10.59
10.93
1.29
11.66
12.06| |tt||12.48
0.010
5.51
5.65
5.80
5.96
6. 11
6.27
6.44
6.61
6.78
6. 96
7. 14||h||7.33||h||7:53||h||7.73||h||7. 91
Be18
8.39
8.63
8.88
9.14
9.41
9.69
9.98| |h||10.30||h||10.62||h||10. 96
11.32
11.70
12.10
12.53
05
10.36
10.69
11.03
11.40
11.78
12.19
JB/T4291-1999||tt ||表1
0.003
5.41
5.55
5.70
5. 85
.1f
32
6. 66
6.83
7.01
7.20
7.39
7.59
7.79
8.01
8.23| |tt||8.
46
80
8.95
9.22
9.49
9.78
10.08|| tt||10.39
10.72
11.07
11. 43
11.82
12.23
0.004
5.42
5.57
5.71
5.86
6: 02
6. 34
hl
6. 67.
6.85
7.03
7.22
7.41
7.61
7.82
8.03
8.25
49
73
8.98
9.24
9.52
10.11
[0.42
10.76| |tt||11. 10
4
11.86
12.27
0.005
5.43
5.58
5.73
.83
6. 35
6. 69
6.87
7.05
7.24
7.43
7.63
了
8. 05
8. 28||h||8.51||h||8. 75
9.27
9.55
9.84
10. 14
F
10. 79
11.14
11.90
12.31
0.006
5.45
5.59
5.89
5.
6. 21
5.37
6.54
6.71
6.88
7.07
7.25
7.45
7.65| |tt||7..86
8. 07
8.30
B.53
81
9.03
9.30
9.57
9.86
10.17
10. 49
10.82
11.18
11.55
11.94
12.35
0.007
5.46
5.61| |tt||5.76
5. 91
6.07
6.22
6.39
6. 55
6.73
6.90
7. 09
7.27
7: 47
7.67
7.88
8, 10
8.32
8. 56
容. 80
9. 06
9. 32
9.60
9.89
10.20
10.52
10.86
11. 21
11.59
11.98
12.40
0.008
5.48
5, t2
5.77
5.93
6.08
6.40
6.57
6.74
6.92
7.10
7.29
7.49| |tt||7.69
7.90
8. 12
XF
8.58
8.-83
9.08
9.35
9.63
9.92||tt| |10.23||h||10.55||h||10.89||h||11. 25
11. 62
12.02
12.44
0.009
5.49
5.64
5.79
5.94
6.10.
6. 26.
6.42
6.59
6.76
6.94
7.12
7.31
7. 51
7.71
7.92
8.14
8.37
85
4.11
9. 38
9.66
9.95
10.26
10.59
10.93
1.29
11.66
12.06| |tt||12.48
0.010
5.51
5.65
5.80
5.96
6. 11
6.27
6.44
6.61
6.78
6. 96
7. 14||h||7.33||h||7:53||h||7.73||h||7. 91
Be18
8.39
8.63
8.88
9.14
9.41
9.69
9.98| |h||10.30||h||10.62||h||10. 96
11.32
11.70
12.10
12.53
05
10.36
10.69
11.03
11.40
11.78
12.19
JB/T4291-1999||tt ||表1
0.003
5.41
5.55
5.70
5. 85
.1f
32
6. 66
6.83
7.01
7.20
7.39
7.59
7.79
8.01
8.23| |tt||8.
46
80
8.95
9.22
9.49
9.78
10.08|| tt||10.39
10.72
11.07
11. 43
11.82
12.23
0.004
5.42
5.57
5.71
5.86
6: 02
6. 34
hl
6. 67.
6.85
7.03
7.22
7.41
7.61
7.82
8.03
8.25
49
73
8.98
9.24
9.52
10.11
[0.42
10.76| |tt||11. 10
4
11.86
12.27
0.005
5.43
5.58
5.73
.83
6. 35
6. 69
6.87
7.05
7.24
7.43
7.63
了
8. 05
8. 28||h||8.51||h||8. 75
9.27
9.55
9.84
10. 14
F
10. 79
11.14
11.90
12.31
0.006
5.45
5.59
5.89
5.
6. 21
5.37
6.54
6.71
6.88
7.07
7.25
7.45
7.65| |tt||7..86
8. 07
8.30
B.53
81
9.03
9.30
9.57
9.86
10.17
10. 49
10.82
11.18
11.55
11.94
12.35
0.007
5.46
5.61| |tt||5.76
5. 91
6.07
6.22
6.39
6. 55
6.73
6.90
7. 09
7.27
7: 47
7.67
7.88
8, 10
8.32
8. 56
容. 80
9. 06
9. 32
9.60
9.89
10.20
10.52
10.86
11. 21
11.59
11.98
12.40
0.008
5.48
5, t2
5.77
5.93
6.08
6.40
6.57
6.74
6.92
7.10
7.29
7.49| |tt||7.69
7.90
8. 12
XF
8.58
8.-83
9.08
9.35
9.63
9.92||tt| |10.23||h||10.55||h||10.89||h||11. 25
11. 62
12.02
12.44
0.009
5.49
5.64
5.79
5.94
6.10.
6. 26.
6.42
6.59
6.76
6.94
7.12
7.31
7. 51
7.71
7.92
8.14
8.37
85
4.11
9. 38
9.66
9.95
10.26
10.59
10.93
1.29
11.66
12.06| |tt||12.48
0.010
5.51
5.65
5.80
5.96
6. 11
6.27
6.44
6.61
6.78
6. 96
7. 14||h||7.33||h||7:53||h||7.73||h||7. 91
Be18
8.39
8.63
8.88
9.14
9.41
9.69
9.98| |h||10.30||h||10.62||h||10. 96
11.32
11.70
12.10
12.53
86
6:02
6. 34
hl
6. 67.
6.85
7.03
7.22
7.41
7.61
7.82
8.03
8.25
49
73
8.98
9.24
9.52
10.11
[0.42
10.76| |tt||11. 10
4
11.86
12.27
0.005
5.43
5.58
5.73
.83
6. 35
6. 69
6.87
7.05
7.24
7.43
7.63
了
8. 05
8. 28||h||8.51||h||8. 75
9.27
9.55
9.84
10. 14
F
10. 79
11.14
11.90
12.31
0.006
5.45
5.59
5.89
5.
6. 21
5.37
6.54
6.71
6.88
7.07
7.25
7.45
7.65| |tt||7..86
8. 07
8.30
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