Some standard content:
UDC 669: 620.17
National Standard of the People's Republic of China
GB548293
Metallic materials--Dynamic tear testing method1993-01-03Promulgated
Implementation on 1993-10-01
Promulgated by the State Administration of Technical Supervision
National Standard of the People's Republic of China
Metallic materials--Dynamic tear testing method
Metallic materiais--Dyamis teartesting incthod
1 Subject content and scope of application
GB 5482--93
Replaces G6 5182-8
This standard specifies the dynamic tear test specimens for metals and their preparation, testing machines, test methods and processing of test results. This standard is applicable to the determination of dynamic tear energy and fiber section rate of metal materials or welded joint specimens with Rockwell hardness values less than HRC36.
2 Reference standards
GB2975 Sampling regulations for mechanical and process performance tests of steel materials GB3808 Pendulum impact testing machine
GB/T12778 Determination method of metal Charpy impact fracture 3 Terminology
3.1 Dynamic tear test (DT test) dynamic tear test is a test in which a dynamic tear specimen in a simply supported beam state is broken once on an impact testing machine to measure its absorbed energy and fiber section rate (SA%).
3.2 Dynamic tear energy (DT energy) dynamicear energy The energy absorbed by the specimen during the dynamic tear test is used to characterize the ability of metal materials of each specific thickness to resist dynamic tearing. 3.3 Fracture surface of dynamic tear specimen Fracture surface of dynamic tear specimen after the dynamic tear specimen is broken. Its macroscopic morphology is generally crystalline, fibrous (including shear lip) or mixed. 4 Test specimens and their preparation
4.1 Sampling
4.1.1 The cutting position and direction of the sample shall comply with the provisions of GB2975 or relevant technical conditions. 4.1.2 The sampling method of welded joint test specimens is shown in Appendix A (supplement). 4.2 Test specimens
4.2.1 The outer dimensions of the test specimens with a thickness of 5 to 16 mm are 180 mm × 40 mm × tmm. The dimensions and tolerances are shown in Figure 1. Sample rings with a thickness greater than 16 mm can be processed into 16 mm thick test specimens. The test specimens taken from plates with a thickness of 5 to 16 mm retain the original rolled surface, and the thickness tolerance shall be in accordance with the relevant technical conditions.
Dynamic tearing test specimens with a thickness equal to or greater than 25 mm and their preparation and testing machine requirements are shown in Appendix D (reference). Approved by the State Administration of Technical Supervision on January 3, 1993 and implemented on October 1, 1993
180±2
GB 5482---93
Figure 1 Dynamic tearing specimen
4.2.2 The pressed dimensions and tolerances of the specimen notch and notch top are shown in Figure 2 and Table 1. 70+98
Figure 2 Pressed dimensions of the notch and notch top of the dynamic tearing specimen Table 1 Notch dimensions and tolerances
Geometry parameters of notch
Clear width (b-α)
Machinery notch width bg
Machinery notch root angle αn
Machinery notch root radius r
Pressure top depth D,
Pressure top angle αr
Pressure top end root radius rt
Pressure top end root radius r
Machinery notch root radius below,
4.3 Notch preparation
GB 5482-93
4.3.1 The notch of the specimen can be processed by milling or wire cutting, but a group of specimens must be processed by the same processing method. 4.3.2 Before testing, the specimens that have passed the machining process must be pressed with a press cutter with a hardness of not less than HRC60. The pressing method is shown in Appendix B (Supplement).
4.3.3 The dimensions of the press cutter are shown in Figure 3. The cutting edge should be free of burrs and defects. The rest 1.60
Figure 3 Press cutter for sharpening the notch top
The blade radius T≤0.025
4.3.4 The pressing depth on both sides of the notch top should comply with the provisions of Table 1. The measurement method of the notch pressing depth is shown in Appendix C (Supplement). 4.3.5 The top of the notch of the specimen should be pressed one by one. The required pressure can be estimated by the following formula: PK.ob·t
Where: P—pressure, N;
Ob tensile strength, N/mm2
t--specimen thickness, mm;
K—coefficient, K=1.8±0.5, mm. 5 Testing machine
5.1 Dynamic tear test usually adopts pendulum impact test machine, whose energy should be able to break the specimen in one impact. The energy required for dynamic tear test of most steels: 16mm thick specimen is about 3000J; 5mm thick specimen is about 500J. The energy required for aluminum alloy is about 20% lower than that of the above steel.
A drop hammer impact test machine can also be used. The relevant parameters of the test machine should be consistent with this standard and the energy indication should be accurately calibrated. 5.2 The impact velocity of the pendulum at the moment of impact should be 4.0~8.5m/s. 5.3 The graduation of the reading plate of the pendulum impact tester shall comply with the provisions of Table 2. 3
Maximum impact energy # value
>500 ~1 500
>1 500 ~3 000
GB 5482-93
5.4 The hardness of the support and impact blade of the testing machine shall not be less than IIRC:48, and its size and support span shall comply with the provisions of Figure 4. Moon blade radius 12.7:0.8
Impact force
Support radius 12.7±0.8
Figure 4 Support and impact blade of dynamic tear tester 5.5 The error of dynamic tear energy value caused by pendulum weight or drop height shall not exceed 1.%, and the energy loss caused by wind resistance and friction resistance shall not exceed 2% of the initial potential energy. 5.6 The gap between the two sides of the pendulum and the support shall not be less than 51mm. The motion plane of the center line of the impact knife shall pass through the midpoint of the support span, and the deviation shall not exceed 0.8mm. The impact blade shall be perpendicular to the longitudinal axis of the specimen, and its deviation shall not exceed 0.01rad. The parallelism between the impact blade and the side of the specimen shall not exceed 0.005rad. The vertical support surface of the support shall be perpendicular to the horizontal support surface, and the deviation shall be within 0.025rad. The left and right sides of the vertical support surface and the horizontal support surface of the support shall be on the plane, and the deviation shall not exceed 0.13mm. 5.7 The distance from the center of the pendulum shaft to the center of the pendulum strike shall be consistent with the distance from the center of the pendulum shaft to the center of the specimen, and the difference between the two shall be less than 1% of the distance from the center of the pendulum shaft to the center of the pendulum strike. When the pendulum is freely suspended, the distance from the side of the specimen to the impact blade shall be less than 5mm. 5.8 A safety cover shall be added around the support to prevent the broken specimen from flying out. 5.9 For the technical parameters of the testing machine not specifically specified in this standard, refer to the relevant provisions of GB3808. 5.10 The testing machine shall be calibrated regularly.
6 Test steps
6.1 Before the test, immerse the sample in the sieve plate of the insulation tank filled with cooling or heating medium. The sieve plate should be at least 25mm away from the bottom of the tank, and the distance between the samples should be at least equal to the thickness of the sample. The medium in the tank should flow to keep the temperature in the tank uniform. The difference between the temperature of the medium and the test temperature should be controlled within ±1 (range, and the insulation time is calculated as 1min/mm, but at least 15min. 6.2 From taking out the sample from the insulation tank to breaking, it should be completed within 10s. If it exceeds 10s without testing, the sample should be put back into the insulation tank and kept warm for at least another 10min. The sample shall not be clamped near the notch with a fixture that is significantly different from the test temperature. 4
GB5482-93
6.3 The sample should be placed close to the support, and the center line of the impact blade should be aligned with the top of the notch, with a deviation within ±0.8mm. 6.4 Interrupt the sample and record the test humidity and dynamic tear Energy value. 6.5 At least two specimens shall be tested at each test temperature. 7 Calculation of fiber cross-sectional area
7.1 Measurement of crystalline area
7.1.1 The shape of the crystalline area of the dynamic tearing specimen of non-austenitic steel is usually irregular. In order to directly measure its area, these irregular crystalline areas need to be merged into equivalent figures such as rectangles, triangles or trapezoids that are easy to measure and calculate, as shown in Figure 5. Then, use a measuring tool with a minimum scale of not less than 0.1mm to measure the corresponding length of the equivalent figure and calculate the crystalline area. 19.0mm
Figure 5 Schematic diagram of the fracture of a typical dynamic tearing specimen and its crystalline area equivalent merging method 7.1.2 Take a photo of the fracture of the sample and measure the area of the crystalline zone with a planimeter. 7.1.3 Use the test method specified in GB/T12778 or other test methods that can ensure measurement accuracy to measure the area of the crystalline zone. 7.1.4 If a sample fracture is divided into several crystalline zones, the area of each crystalline zone should be measured separately, and then the areas of the several zones should be added together. .2 Calculation of fiber cross-sectional rate
7.2.1 The fibrous area of the fracture is obtained by subtracting the area of the tripod zone from the original cross-sectional area of the fracture. 7.2.2 The percentage of the ratio of the fibrous area to the original cross-sectional area of the fracture is the fiber cross-sectional rate. 8 Test result processing
8.1 The test data should retain at least two significant figures. 8.2 When the DT energy value is higher than 80% of the initial potential energy, it should be noted in the test report. 8.3 If any of the following situations occurs during the test, the test data will be invalid: a. Operation error;
b. Hammer jam occurs during the test.
9 Test report
The test report shall include: material brand, furnace (tank) batch number, specification, state, specimen number, specimen thickness, sampling direction, test temperature, dynamic tearing energy and fiber cross-sectional area ratio. For welded joint specimens, the notch position shall also be indicated. 5
A1 Preparation of test plates
GB 5482--93
Appendix A
Sampling method for welded joint specimens
(Supplement)
A1.1 The parent material for the test plate and its orientation and welding materials shall comply with the relevant technical conditions. A1.2 The width of the parent material for the test plate shall comply with the provisions of Table A. Its length may be determined according to the number of samples, but shall not be less than 400mm. Table A
Test plate thickness 1
≥24 ~ 50
Test plate width B
≥150
A1.3 Within the length of 200mm, the deflection f of the test plate shall not exceed 10% of the plate thickness and shall not be greater than 4mm. The misalignment h of the test plate shall not exceed 15% of the plate thickness and shall not be greater than 4mm, see Figure Al. 100
Figure A1 Test plate deflection and misalignment
A2 Sample cutting
A2.1 The test sample shall be cut from the welded test plate or welded structure. Before cutting the sample, 50mm shall be cut off from both ends of the test plate. A2.2 When cutting the sample, mechanical cutting method shall be used as much as possible. If flame cutting method is used, sufficient machining margin shall be left to ensure that the test metal is not affected by heat.
A3 The specimen shall be cut as close to the rear weld surface as possible, as shown in Figure A2. 6
A4 Notch position of test specimen
Processing line
GB5482-93
First weld surface
Later weld surface
Figure A2 Schematic diagram of test specimen cutting
A4.1 The notch axis of the weld metal test specimen shall be perpendicular to the weld surface and located at the center of the weld, as shown in Figure A3. Figure A3 Notch position of weld metal test specimen
A4.2 The notch axis of the fusion line and near-seam area test specimen shall be perpendicular to the weld surface. The notch position of the fusion line is opened at point M at the intersection of the plane of half the thickness of the test specimen and the fusion line. The notch position of each part of the near-seam area is opened at point H outside point M according to the technical requirements, as shown in Figure A4.
Figure A4 Notch position of fusion line and near-seam area test specimen.
GB5482-93
Appendix B
Pressure at the top of the notch
(Supplement)
This standard adopts displacement control method or load control method to complete the pressure at the top of the notch. The notch can be pressed by a press or a universal material tester. B1 Displacement Control Method
B1.1 Before each pressing, check the press cutter. The press cutter shall comply with the provisions of Article 4.3.3, and the metal chips in the notch of the specimen and the burrs on the edge of the notch shall be carefully removed.
B1.2 Preload the notch and align the dial of the micrometer to zero. Steel specimens with a thickness of 10 to 16 mm can be preloaded with 400 N, and steel specimens with a thickness of less than 10 nm and other softer metal specimens can be preloaded with 200 N. B1.3 Use a micrometer to control the amount of pressing. The micrometer reading should be greater than the pressing depth specified in Table 1. The excess amount is related to the test material and the thickness of the specimen, and should be determined by actual measurement according to Appendix C. B2 Load control method
B2.1 The requirements before pressing are the same as B1.1.
B2.2 Press the notch with the load estimated by the pressure formula in Article 4.3.5, record the load, and measure the pressing depth according to Appendix C. If the pressing depths of the three specimens meet the requirements of Table 1, the remaining specimens of the same batch number and thickness can be pressed at this load. B2.3 If the measured pressing depth does not meet the requirements, the pressure should be adjusted and pressed again until a stable and qualified pressing depth is obtained. B2.4 The pressing depth should be randomly checked during the pressing process. B3 As long as the pressing depth in Table 1 can be reached, other methods can also be used to press the top of the notch. Appendix C
Measurement of notch pressing depth
(Supplement)
C1 The measurement of notch pressing depth is usually carried out according to the following steps: a. Draw a reference line about 2mm away from the top of the machined notch on both sides of the sample, or use the edge of the sample as the reference line, and make identification marks respectively
b. Use a tool microscope or a reading microscope with an accuracy of not less than 0.01mm to measure the distance between the top of the machined notch on both sides of the unpressed sample and the reference line;
c. Press the top of the notch according to any method in Appendix B; d. Measure the distance between the top of the pressed notch on both sides of the sample and the reference line. e. The pressing depth of the notch top is the difference between the results measured in b and d. C2 As long as the measurement accuracy can reach 0.01mm, other methods can also be used to measure the depth of the pressed notch top. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens with other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the pressing top depth D, =1.0±0.15mm, and the other notch dimensions and tolerances are the same as Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degree
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".3 If any of the following situations occur during the test, the test data will be invalid: a. Operation error;
b. Hammer jamming during the test.
9 Test report
The test report should include: material brand, furnace (tank) batch number, specification, state, sample number, sample thickness, sampling direction, test temperature, dynamic tearing energy and fiber cross-sectional area. For welded joint samples, the notch position should also be indicated. 5
A1 Preparation of test plates
GB 5482--93
Appendix A
Sampling method for welded joint samples
(Supplement)
A1.1 The parent material for the test plate and its orientation and welding materials shall comply with the relevant technical conditions. A1.2 The width of the parent material for the test plate shall comply with the provisions of Table A. Its length may be determined according to the number of samples, but shall not be less than 400 mm. Table A
Test plate thickness 1
≥24 ~ 50
Test plate width B
≥150
A1.3 Within the length of 200mm, the deflection f of the test plate shall not exceed 10% of the plate thickness and shall not be greater than 4mm. The misalignment h of the test plate shall not exceed 15% of the plate thickness and shall not be greater than 4mm, see Figure Al. 100
Figure A1 Test plate deflection and misalignment
A2 Sample cutting
A2.1 The test sample shall be cut from the welded test plate or welded structure. Before cutting the sample, 50mm shall be cut off from both ends of the test plate. A2.2 When cutting the sample, mechanical cutting method shall be used as much as possible. If flame cutting method is used, sufficient machining margin shall be left to ensure that the test metal is not affected by heat.
A3 The specimen shall be cut as close to the rear weld surface as possible, as shown in Figure A2. 6
A4 Notch position of test specimen
Processing line
GB5482-93
First weld surface
Later weld surface
Figure A2 Schematic diagram of test specimen cutting
A4.1 The notch axis of the weld metal test specimen shall be perpendicular to the weld surface and located at the center of the weld, as shown in Figure A3. Figure A3 Notch position of weld metal test specimen
A4.2 The notch axis of the fusion line and near-seam area test specimen shall be perpendicular to the weld surface. The notch position of the fusion line is opened at point M at the intersection of the plane of half the thickness of the test specimen and the fusion line. The notch position of each part of the near-seam area is opened at point H outside point M according to the technical requirements, as shown in Figure A4.
Figure A4 Notch position of fusion line and near-seam area test specimen.
GB5482-93
Appendix B
Pressure at the top of the notch
(Supplement)
This standard adopts displacement control method or load control method to complete the pressure at the top of the notch. The notch can be pressed by a press or a universal material tester. B1 Displacement Control Method
B1.1 Before each pressing, check the press cutter. The press cutter shall comply with the provisions of Article 4.3.3, and the metal chips in the notch of the specimen and the burrs on the edge of the notch shall be carefully removed.
B1.2 Preload the notch and align the dial of the micrometer to zero. Steel specimens with a thickness of 10 to 16 mm can be preloaded with 400 N, and steel specimens with a thickness of less than 10 nm and other softer metal specimens can be preloaded with 200 N. B1.3 Use a micrometer to control the amount of pressing. The micrometer reading should be greater than the pressing depth specified in Table 1. The excess amount is related to the test material and the thickness of the specimen, and should be determined by actual measurement according to Appendix C. B2 Load control method
B2.1 The requirements before pressing are the same as B1.1.
B2.2 Press the notch with the load estimated by the pressure formula in Article 4.3.5, record the load, and measure the pressing depth according to Appendix C. If the pressing depths of the three specimens meet the requirements of Table 1, the remaining specimens of the same batch number and thickness can be pressed at this load. B2.3 If the measured pressing depth does not meet the requirements, the pressure should be adjusted and pressed again until a stable and qualified pressing depth is obtained. B2.4 The pressing depth should be randomly checked during the pressing process. B3 As long as the pressing depth in Table 1 can be reached, other methods can also be used to press the top of the notch. Appendix C
Measurement of notch pressing depth
(Supplement)
C1 The measurement of notch pressing depth is usually carried out according to the following steps: a. Draw a reference line about 2mm away from the top of the machined notch on both sides of the sample, or use the edge of the sample as the reference line, and make identification marks respectively
b. Use a tool microscope or a reading microscope with an accuracy of not less than 0.01mm to measure the distance between the top of the machined notch on both sides of the unpressed sample and the reference line;
c. Press the top of the notch according to any method in Appendix B; d. Measure the distance between the top of the pressed notch on both sides of the sample and the reference line. e. The pressing depth of the notch top is the difference between the results measured in b and d. C2 As long as the measurement accuracy can reach 0.01mm, other methods can also be used to measure the depth of the pressed notch top. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens with other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the pressing top depth D, =1.0±0.15mm, and the other notch dimensions and tolerances are the same as Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degree
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".3 If any of the following situations occur during the test, the test data will be invalid: a. Operation error;
b. Hammer jamming during the test.
9 Test report
The test report should include: material brand, furnace (tank) batch number, specification, state, sample number, sample thickness, sampling direction, test temperature, dynamic tearing energy and fiber cross-sectional area. For welded joint samples, the notch position should also be indicated. 5
A1 Preparation of test plates
GB 5482--93
Appendix A
Sampling method for welded joint samples
(Supplement)
A1.1 The parent material for the test plate and its orientation and welding materials shall comply with the relevant technical conditions. A1.2 The width of the parent material for the test plate shall comply with the provisions of Table A. Its length may be determined according to the number of samples, but shall not be less than 400 mm. Table A
Test plate thickness 1
≥24 ~ 50
Test plate width B
≥150
A1.3 Within the length of 200mm, the deflection f of the test plate shall not exceed 10% of the plate thickness and shall not be greater than 4mm. The misalignment h of the test plate shall not exceed 15% of the plate thickness and shall not be greater than 4mm, see Figure Al. 100
Figure A1 Test plate deflection and misalignment
A2 Sample cutting
A2.1 The test sample shall be cut from the welded test plate or welded structure. Before cutting the sample, 50mm shall be cut off from both ends of the test plate. A2.2 When cutting the sample, mechanical cutting method shall be used as much as possible. If flame cutting method is used, sufficient machining margin shall be left to ensure that the test metal is not affected by heat.
A3 The specimen shall be cut as close to the rear weld surface as possible, as shown in Figure A2. 6
A4 Notch position of test specimen
Processing line
GB5482-93
First weld surface
Later weld surface
Figure A2 Schematic diagram of test specimen cutting
A4.1 The notch axis of the weld metal test specimen shall be perpendicular to the weld surface and located at the center of the weld, as shown in Figure A3. Figure A3 Notch position of weld metal test specimen
A4.2 The notch axis of the fusion line and near-seam area test specimen shall be perpendicular to the weld surface. The notch position of the fusion line is opened at point M at the intersection of the plane of half the thickness of the test specimen and the fusion line. The notch position of each part of the near-seam area is opened at point H outside point M according to the technical requirements, as shown in Figure A4.
Figure A4 Notch position of fusion line and near-seam area test specimen.
GB5482-93
Appendix B
Pressure at the top of the notch
(Supplement)
This standard adopts displacement control method or load control method to complete the pressure at the top of the notch. The notch can be pressed by a press or a universal material tester. B1 Displacement Control Method
B1.1 Before each pressing, check the press cutter. The press cutter shall comply with the provisions of Article 4.3.3, and the metal chips in the notch of the specimen and the burrs on the edge of the notch shall be carefully removed.
B1.2 Preload the notch and align the dial of the micrometer to zero. Steel specimens with a thickness of 10 to 16 mm can be preloaded with 400 N, and steel specimens with a thickness of less than 10 nm and other softer metal specimens can be preloaded with 200 N. B1.3 Use a micrometer to control the amount of pressing. The micrometer reading should be greater than the pressing depth specified in Table 1. The excess amount is related to the test material and the thickness of the specimen, and should be determined by actual measurement according to Appendix C. B2 Load control method
B2.1 The requirements before pressing are the same as B1.1.
B2.2 Press the notch with the load estimated by the pressure formula in Article 4.3.5, record the load, and measure the pressing depth according to Appendix C. If the pressing depths of the three specimens meet the requirements of Table 1, the remaining specimens of the same batch number and thickness can be pressed at this load. B2.3 If the measured pressing depth does not meet the requirements, the pressure should be adjusted and pressed again until a stable and qualified pressing depth is obtained. B2.4 The pressing depth should be randomly checked during the pressing process. B3 As long as the pressing depth in Table 1 can be reached, other methods can also be used to press the top of the notch. Appendix C
Measurement of notch pressing depth
(Supplement)
C1 The measurement of notch pressing depth is usually carried out according to the following steps: a. Draw a reference line about 2mm away from the top of the machined notch on both sides of the sample, or use the edge of the sample as the reference line, and make identification marks respectively
b. Use a tool microscope or a reading microscope with an accuracy of not less than 0.01mm to measure the distance between the top of the machined notch on both sides of the unpressed sample and the reference line;
c. Press the top of the notch according to any method in Appendix B; d. Measure the distance between the top of the pressed notch on both sides of the sample and the reference line. e. The pressing depth of the notch top is the difference between the results measured in b and d. C2 As long as the measurement accuracy can reach 0.01mm, other methods can also be used to measure the depth of the pressed notch top. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens with other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the pressing top depth D, =1.0±0.15mm, and the other notch dimensions and tolerances are the same as Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degreebzxz.net
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".2. Cut the sample and try to use mechanical cutting method. If flame cutting method is used, sufficient processing base should be left to ensure that the test metal is not affected by heat.
A3 The sample should be cut as close to the rear weld surface as possible, as shown in Figure A2. 6
A4 Sample notch position
Processing line
GB5482-93
First weld surface
Rear weld surface
Figure A2 Sample cutting diagram
A4.1 The notch axis of the weld metal sample should be perpendicular to the weld surface and located at the center of the weld, as shown in Figure A3. Figure A3 Weld metal sample notch position
A4.2 The notch axis of the fusion line and near-seam area samples is perpendicular to the weld surface. The notch position of the fusion line is opened at point M where the half-thickness plane of the sample and the fusion line intersect. The notch positions of various parts of the near-seam area are opened at point H outside point M according to the technical requirements, as shown in Figure A4.
Figure A4 Notch position machine of fusion line and near-seam area specimen.
GB5482-93
Appendix B
Pressure of notch top
(Supplement)
This standard adopts displacement control method or load control method to complete the pressure of notch top. Pressing notch can be done by press machine or universal material test B1 displacement control method
B1.1 Before each pressing, check the press cutter. The press cutter should comply with the provisions of 4.3.3, and the metal chips in the notch of the specimen and the burrs on the edge of the notch should be carefully removed.
B1.2 Preload the notch and align the dial of the micrometer to zero. Steel specimens with a thickness of 10 to 16 mm can be preloaded with 400N, and steel specimens with a thickness of less than 10nm and other softer metal specimens can be preloaded with 200N. B1.3 Use a micrometer to control the amount of pressing. The micrometer reading should be greater than the pressing depth specified in Table 1. The excess amount is related to the test material and the thickness of the sample, and should be determined by actual measurement according to Appendix C. B2 Load control method
B2.1 The requirements before pressing are the same as B1.1.
B2.2 Press the notch according to the load estimated by the pressure formula in Article 4.3.5, record the load, and measure the pressing depth according to Appendix C. If the pressing depth of the three samples meets the requirements of Table 1, the remaining samples of the same batch number and thickness can be pressed according to this load. B2.3 If the measured pressing depth does not meet the requirements, the pressure should be adjusted and pressed again until a stable and qualified pressing depth is obtained. B2.4 The pressing depth should be sampled during the pressing process. B3 As long as the pressing depth in Table 1 can be reached, other methods can also be used to press the top of the notch. Appendix C
Measurement of notch pressing depth
(Supplement)
C1 The measurement of notch pressing depth is usually carried out according to the following steps: a. Draw a reference line about 2mm away from the top of the machined notch on both sides of the sample, or use the edge of the sample as the reference line, and make identification marks respectively
b. Use a tool microscope or a reading microscope with an accuracy of not less than 0.01mm to measure the distance between the top of the machined notch on both sides of the unpressed sample and the reference line;
c. Press the top of the notch according to any method in Appendix B; d. Measure the distance between the top of the pressed notch on both sides of the sample and the reference line. e. The pressing depth of the notch top is the difference between the results measured in b and d. C2 As long as the measurement accuracy can reach 0.01mm, other methods can also be used to measure the depth of the pressed notch top. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens with other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the pressing top depth D, =1.0±0.15mm, and the other notch dimensions and tolerances are the same as Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degree
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".2. Cut the sample and try to use mechanical cutting method. If flame cutting method is used, sufficient processing base should be left to ensure that the test metal is not affected by heat.
A3 The sample should be cut as close to the rear weld surface as possible, as shown in Figure A2. 6
A4 Sample notch position
Processing line
GB5482-93
First weld surface
Rear weld surface
Figure A2 Sample cutting diagram
A4.1 The notch axis of the weld metal sample should be perpendicular to the weld surface and located at the center of the weld, as shown in Figure A3. Figure A3 Weld metal sample notch position
A4.2 The notch axis of the fusion line and near-seam area samples is perpendicular to the weld surface. The notch position of the fusion line is opened at point M where the half-thickness plane of the sample and the fusion line intersect. The notch positions of various parts of the near-seam area are opened at point H outside point M according to the technical requirements, as shown in Figure A4.
Figure A4 Notch position machine of fusion line and near-seam area specimen.
GB5482-93
Appendix B
Pressure of notch top
(Supplement)
This standard adopts displacement control method or load control method to complete the pressure of notch top. Pressing notch can be done by press machine or universal material test B1 displacement control method
B1.1 Before each pressing, check the press cutter. The press cutter should comply with the provisions of 4.3.3, and the metal chips in the notch of the specimen and the burrs on the edge of the notch should be carefully removed.
B1.2 Preload the notch and align the dial of the micrometer to zero. Steel specimens with a thickness of 10 to 16 mm can be preloaded with 400N, and steel specimens with a thickness of less than 10nm and other softer metal specimens can be preloaded with 200N. B1.3 Use a micrometer to control the amount of pressing. The micrometer reading should be greater than the pressing depth specified in Table 1. The excess amount is related to the test material and the thickness of the sample, and should be determined by actual measurement according to Appendix C. B2 Load control method
B2.1 The requirements before pressing are the same as B1.1.
B2.2 Press the notch according to the load estimated by the pressure formula in Article 4.3.5, record the load, and measure the pressing depth according to Appendix C. If the pressing depth of the three samples meets the requirements of Table 1, the remaining samples of the same batch number and thickness can be pressed according to this load. B2.3 If the measured pressing depth does not meet the requirements, the pressure should be adjusted and pressed again until a stable and qualified pressing depth is obtained. B2.4 The pressing depth should be sampled during the pressing process. B3 As long as the pressing depth in Table 1 can be reached, other methods can also be used to press the top of the notch. Appendix C
Measurement of notch pressing depth
(Supplement)
C1 The measurement of notch pressing depth is usually carried out according to the following steps: a. Draw a reference line about 2mm away from the top of the machined notch on both sides of the sample, or use the edge of the sample as the reference line, and make identification marks respectively
b. Use a tool microscope or a reading microscope with an accuracy of not less than 0.01mm to measure the distance between the top of the machined notch on both sides of the unpressed sample and the reference line;
c. Press the top of the notch according to any method in Appendix B; d. Measure the distance between the top of the pressed notch on both sides of the sample and the reference line. e. The pressing depth of the notch top is the difference between the results measured in b and d. C2 As long as the measurement accuracy can reach 0.01mm, other methods can also be used to measure the depth of the pressed notch top. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens with other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the pressing top depth D, =1.0±0.15mm, and the other notch dimensions and tolerances are the same as Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degree
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".01mm, other methods can also be used to measure the depth of the top of the pressed notch. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens of other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the top depth of the pressed notch D, =1.0±0.15mm, and the other dimensions and tolerances of the notch are the same as those in Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degree
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".01mm, other methods can also be used to measure the depth of the top of the pressed notch. O
GB5482--93
Dynamic tearing specimens and testing machines with a thickness greater than or equal to 25mm (reference part)
D1 The sampling method for dynamic tearing specimens with a thickness of 25mm, 32mm and 40mm is shown in 4.1.1, and the dimensions are shown in Figure D1 and Table D1. The specimens taken from the plates with a thickness of 25mm, 32mm and 40mm retain the original rolling surface. The specimens of other thickness sizes can be processed into specimens with the corresponding dimensions mentioned above.
D2 The notch width bn=3mm, the top depth of the pressed notch D, =1.0±0.15mm, and the other dimensions and tolerances of the notch are the same as those in Table 1. The pressure P required to press the notch is estimated according to the formula in Article 4.3.5, but K in the formula is taken as 3.6±0.5mm. 1
Figure D1 Greater than or equal to 25mm dynamic tearing specimen Table D1
Specimen size parameters
Support span
Support radius
Impact blade radius
460±5
120 ±1
550±5
160±1
Note: If the support radius and impact blade radius of the testing machine are different from those in Table D1, it should be noted in the test report. D3 The length and thickness of the press knife are 50mm and 2.5mm respectively. The rest of the requirements are shown in Figure 3. Degree
650±5
200±1
GB5482—93
D4 The capacity of the testing machine should not be less than 7500-, and the maximum value of the grid of its reading disk is 50~100J, and should not be greater than 1/50 of the capacity. The impact blade radius, support radius and support span of the D5 testing machine shall comply with the provisions of Table D1. The insulation time of the D6 specimen in the insulation tank shall not be less than 1.5min/mm. During the D7 test, the removal of the specimen from the insulation tank to the breaking shall be completed within 30 s. Additional notes:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation, and Jiangnan Shipyard and Wuchang Shipyard participated in the drafting. The main drafters of this standard are Bi Chuantang, Liu Jiaju, Jiang Hesui, Yan Mingjun, Xi Fangfei and He Wu. This standard refers to the American Society for Testing and Materials standard ASTME604-83 (approved in 1988) "Standard Test Method for Dynamic Tear Test of Metallic Materials".
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