This standard applies to the Izod impact test of metals. The Izod impact test is carried out at room temperature (10-35°C) with a cantilever beam impact to measure the energy absorbed when the notch of the specimen breaks. The specimen is broken by a single impact of the pendulum. During the impact, the specimen is clamped vertically, and the bottom of the notch and the top surface of the positioning block are in the same plane. The pendulum is at a certain height above the notch and impacts the front of the notch. GB/T 4158-1984 Metal Izod impact test method GB/T4158-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for Izod impact test on metalsUDC 669: 620
.178.7
CB 4158—84
This standard applies to Izod impact test on metals. The Izod impact test is to measure the energy absorbed when the specimen is broken at the notch by cantilever beam impact at room temperature (10-35℃). The breaking of the specimen is completed by a single impact of the pendulum. When punching out, the specimen is clamped vertically, and the bottom of the notch and the top surface of the positioning block are in the same plane. The pendulum is at a certain height above the notch and impacts the front of the notch. 1
Izod punching out: The energy absorbed when a cantilever beam metal specimen with a certain shape and size is broken under the action of a single impact load. The resulting value is called the Izod impact toughness value. The unit is joule (J). 2 Specimens
2.1 For the Izod impact test, square or circular cross-section specimens may be used, and single-notch, double-notch 1 or double-notch specimens may be used. If there is a dispute over the test results, square cross-section specimens shall be used for arbitration tests. 2.1.1 Square cross-section specimens (10×10mm) The shape and dimensions of square cross-section specimens are shown in Figures 1, 2 and 3. The notch and size deviation of the specimens are shown in Figure 4 and Table 1. 1 Direction of impact
←10±0.05
S00# 8
Figure 1 Single-notch square cross-section specimen
Note: The four sides of the cross section and the notch axis of the single, double and triple notch specimens are perpendicular to the longitudinal axis of the specimen, and the four angles are 90±0.5°. Issued by the National Bureau of Standards on February 24, 1984
Strike distance
Implemented on January 1, 1985
GB4158-84
28±0,5
Figure 2 Double-notched square section specimen
28 ± 0.5-
28±door
Figure 3 Triple-notched square section specimen
Ro.25±0.05
Figure 4 Notch of square section specimen
Strike direction
Strike distance
Strike direction
Strike distance
GB 4158-84
Dimensional deviation of square cross-section specimens of ferrous and nonferrous metals
Minimum total length of specimen
1 notch
2 notches
3 notches
Notch bottom radius
Thickness from notch bottom to opposite side
Specimen free end to symmetry plane and
Distance between two adjacent notches
Notch angle
Nominal size
Ferrous metals
Machining deviation
Nonferrous metals
2.1.2 Circular cross-section specimen (diameter 11.43 mm) The shape and size of the circular cross-section specimen are shown in Figures 5, 6 and 7. The notch and dimensional deviation of the specimen are shown in Figure 8 and Table 2.
Strike direction
-50*0 1*8
Figure 5 Single-notch circular cross-section specimen
Strike distance
Note: The maximum and minimum diameter deviations of single-, double- and triple-notch specimens are ±0.01mm. The notch axis is perpendicular to the longitudinal axis of the specimen, and the angle is 90±0.5°202
500+18
GB 4158-84
-28 ± 0. 5-
-28±0.5-
Figure 6 Double-notch circular cross-section specimen
28 ± 0. 5-
R0.25±0.025
Three-notch circular cross-section specimen
Figure 8 Notch of circular cross-section specimen
Strike direction
Strike distance
Strike direction
28±0.5—
Strike distance
GB 4158-- 84
Table 2 Dimensional deviations of circular cross-section specimens of ferrous and nonferrous metals Month
Minimum total length of specimen
1 notch
2 notches
3 notches
Notch bottom radius
Thickness from notch bottom to opposite side
Specimen free end to symmetry plane and
Distance between two adjacent notches
Notch angle
Nominal size
Ferrous metals
Machining deviation
Nonferrous metals
2.2 The notch of the specimen may be manufactured by various processing methods. If the material needs to be heat treated before testing, the notch shall be processed after heat treatment. When processing the specimen, cold work hardening or overheating shall not occur to change the properties of the metal. 3
Testing machine
Positioning block
Positioning block
Figure 9 Schematic diagram of the vertex angle, radius and inclination of the pendulum to the front of the specimen 201
3.1 The testing machine shall meet the following requirements (see Figure 9) GB 4158-84
Distance from the contact line between the specimen and the pendulum to the symmetric plane of the specimen notch 22±0.5mm
3.1.2 Pendulum vertex angle
Radius of the pendulum vertex
Angle between the front of the specimen and the bottom of the pendulum
Instantaneous impact velocity
75±1°
100±1°
3~4 m/s
3.2 The structure and installation of the testing machine shall be firm and rigid. The testing machine shall be fixed on a concrete foundation not less than 150mm thick, or on a foundation not less than 40 times the mass of the pendulum. The bottom horizontal plane should be within 1:1000. 3.3 The pendulum should swing in the vertical plane. The structure of the testing machine should minimize energy loss. The center of impact should coincide with the impact point of the pendulum.
3.4 ​​Impact energy: Most materials use a 150J testing machine for impact testing, and materials with less energy absorption use a micro testing machine. During the test, the energy of the testing machine needs to be recorded.
3.5 The testing machine should be qualified by the national metrology department before it can be used. 4 Test procedure
The specimen is clamped in a positioning block with a vertical positioning groove that places the specimen in the swing plane of the pendulum. The positioning groove must meet the specimen size and tolerance requirements in Tables 1 and 2. The top width of the positioning groove of the square cross-section specimen should be enlarged to 18.5mm (see Figure 10) to adjust the specimen perpendicular to the pendulum plane and facilitate the deformation of the material at the fracture site of the specimen. 18.5
Figure 10 Schematic diagram of the positioning groove of the square section specimen positioning block 4.2 The top of the specimen positioning block is rounded. When positioning and clamping, the notch symmetry surface should coincide with the top surface of the positioning block. Use the positioning template to calibrate the specimen notch orientation. The bottom of the notch of the square specimen faces the pendulum rotation axis, and the bottom of the notch of the circular specimen is parallel to the pendulum impact blade. 24
GB 4158—84
4.3 For specimens with more than two notches, the broken parts should be checked and cleaned after breaking to facilitate the correct test. During the test, the impact energy reading accuracy should be accurate to 1. 4.4
Test result representation
I 150 S (RS) X
Test type Izod:
-Testing machine energy 150J
S-Square section:
--Circular section,
Absorbed energy (J).
Note: 1J= 0.101 972kgf.ms
1 kgf.m =9.806 65J.
Test record and report
Test record and report shall include the following contents: 6.1.1 Test entrusting unit, test number. 6.1.2 Material brand, specification, state, furnace number, origin. 6.1.3
Specimen shape, heat treatment system, testing machine model. Impact toughness value axi.
Tester, checker, test date.
GB 4158--B4
Appendix A
Small-size specimen with rectangular cross section
(Supplement)
When square cross section specimen cannot be used due to the limitation of material shape and size, small-size specimen can be used. The tolerance of small-size specimen processed into the following dimensions shall meet the requirements of Table 1, and the notch shall be processed on the narrow surface of 10mm. 10×7.5mmbzxz.net
10×5.0mm
The test results of small-size specimens cannot be compared with the test results of standard specimens due to their different stress concentration effects and stress distribution states. The test results of specimens of different sizes have no exact relationship with each other and shall not be converted. The test results can only be compared with each other when the specimens are of the same size. There is no exact relationship between different types of impact tests, so it is not allowed to compare and convert impact tests such as Izod impact and Charpy impact. Additional notes:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by the Standardization Institute of the Ministry of Metallurgical Industry and the No. 40 Factory of the Ministry of Aviation Industry. The main drafters of this standard are Bai Nailing and Ding Shoumin. 2
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