This standard is applicable to the room temperature shear (double shear) test of aluminum and aluminum alloy rivet wires and rivets with a diameter less than or equal to 10 mm, and to the determination of their shear resistance. GB/T 3252-1982 Shear test method for aluminum and aluminum alloy rivet wires and rivets GB/T3252-1982 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Aluminium and aluminium alloys
Shear test method for rivet wire and rivets
Aluminium and aluminium alloysShear test method for rivet wire and rivetsUDC669.71-426
3252—82
This standard applies to the room temperature shear (double shear) test of aluminium and aluminium alloy rivet wire and rivets with a diameter less than or equal to 10 mm, and determines their shear resistance.
1 Definition, symbols and formulas
1.1 The shear (double shear) test is to apply a gradually increasing tensile or compressive static load through the corresponding shearing tool, perpendicular to the specimen, so that two cross sections with a limited distance are symmetrically sheared. 1.2 Shear strength refers to the average shear stress on the sheared cross section (measured in terms of the original cross-sectional area) under the maximum load that the specimen bears before shearing.
1.3 The shear strength of the double shear test is calculated as follows: p
- shear strength, kgf/mm2 (N/mm2); - maximum load during shearing, kgf (N) Fg- original cross-sectional area of ​​the specimen, mm2.
2 Specimens
2.1 The cutting position and quantity of the specimens shall comply with the relevant standards. 2.2 Cut a specimen of appropriate length from the wire that has passed the appearance inspection, and it shall be attached with a mark indicating the alloy grade, specification, batch number and specimen number.
For short rivets whose rivet rest length is less than the total thickness of the shearing tool, rivet wires of the same batch and the same heat treatment can be used as specimens. 2.3 If the specimen is bent, it shall be straightened, but it is not allowed to damage the surface of the specimen or change the original properties of the specimen. 3 Test equipment
3.1 The test equipment mainly includes tension, pressure or universal testing machines and corresponding tension or pressure shearing tools. 3.2 The testing machine shall comply with national standards and meet the following basic requirements: a. The error of force indication shall not exceed ±1%;
It shall ensure that the shearing tool passes through the force application center of the machine and applies load to the specimen; b.
Loading shall be stable, the load indication shall be flexible, and the reading shall be stable. It shall have a speed regulating indication device.
Both pull-type and press-type double shearing tools can be used. It is recommended to use the pull-type double shearing tool as shown in Appendix A. 3.3#bzxz.net
The processing and manufacturing of shearing tools must meet the following basic requirements: 3.4
Shearing tools and splints shall be made of high-quality alloy steel with a hardness requirement of HRC62~64; the contact surface between the shears and the splints shall be finely ground with a finish not less than √9; National Bureau of Standards issued on June 21, 1982
implemented on March 1, 1983
GB3252--82
The surface of the holes of the shears and splints 1 shall be smooth with a finish not less than √9, and the contact edges of the holes shall be sharp; c
The axis of the upper working hole and the loading hole (pull type!) shall be located on the center plane and be aligned with the surfaces of the shears and the center plate; d.
eThe dimensions and tolerances of the main components of the shearing tools (scissors, pads, splints and their working holes) are shown in Appendix 4. Test and result processing
4.1 Before the test, measure the diameter of the specimen with a measuring tool with an accuracy of not less than 0.01mm. After rounding the cross-sectional area of ​​the specimen, retain the digits, and the digits after the required digits shall be processed according to the digital rounding period in Appendix C of GB1.1-81 "General provisions for the preparation of standards for standardization guidelines". 4.2 Selection of testing machine and its load dial
4.2.1 The dial should be selected so that the expected maximum shear load is within the range of 20-80% of its range. 4.2.2 When testing small-sized specimens, a small-load testing machine should be used. 4.3 Select an L tool with a suitable aperture according to the nominal diameter of the specimen and fix it on the testing machine without eccentricity. 4.4 Insert the specimen into the hole of the shearing tool without damaging the surface of the specimen. 4.5 During the test, the moving speed of the chuck of the testing machine should not be greater than 20 mm.min. 4.6 The calculated value of the shear strength shall be three digits, and the digits after the required digits shall be processed according to the numerical rounding rules of Appendix C of GB1.1-81. 1.8
A.1 Pull-type double shearing tool
A.1.1 Structural diagram
Dimensions and deviations of main components
Lang nail line
Nominal diameter
-8～10
GB 3252—82
Appendix A
(Supplement)
The dimensions and deviations of the tools selected for the rivet wire test are as follows: Table of dimensions and deviations of the main components of the pull-type double shear tool Shear
Nominal diameter
Nominal thickness
Nominal thickness
S, +0.015
Nominal thickness
The nominal diameter of the hole selected for the rivet test is the diameter of the hole of the rivet wire of the same specification plus the allowable additional instructions for rivet manufacturing:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Northeast Light Alloy. The main drafter of this standard was Chen Guangxian.
From the date of implementation of this standard, the former Ministry of Metallurgical Industry Standard) B648-67 "Shear Test Method for Deformed Aluminum and Aluminum Alloy Wire" was used as a paragraph.
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