GB/T 43115-2023 PDF English
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Metallic materials - Sheet and strip - Shear test method at room temperature
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GB/T 43115-2023: Metallic materials - Sheet and strip - Shear test method at room temperature---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT43115-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.10
CCS H 22
Metallic Materials - Sheet and Strip - Shear Test Method at
Room Temperature
ISSUED ON: SEPTEMBER 7, 2023
IMPLEMENTED ON: APRIL 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Symbols ... 6
5 Principle ... 6
6 Specimens ... 7
7 Test Equipment ... 8
8 Test Procedures ... 9
9 Result Processing ... 10
10 Test Report ... 10
Appendix A (informative) Typical Mould for Shear Test ... 12
Appendix B (informative) Evaluation of Uncertainty of Shear Test Measurement
Results ... 16
Bibliography ... 20
Metallic Materials - Sheet and Strip - Shear Test Method at
Room Temperature
1 Scope
This document specifies the principle, specimens, test equipment, test procedures, test result
processing and test report of shear test method for metallic sheet and strip at room temperature.
This document is applicable to the determination of room temperature shear properties of
metallic sheet and strip with a thickness of 0.5 mm ~ 3 mm. For plates above 3 mm, this
document may be taken as a reference in implementation.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test Pieces for
Mechanical Testing
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of
Limiting Values
GB/T 8541 Terminology of Forging and Stamping
GB/T 8845 Dies and Moulds - Terminology
GB/T 16743-2010 Blanking Clearance
GB/T 16825.1 Metallic Materials - Calibration and Verification of Static Uniaxial Testing
Machines - Part 1: Tension / Compression Testing Machines - Calibration and Verification of
the Force-measuring System
JJG 139 Tension, Compression and Universal Testing Machines
JJG 475 Electronic Universal Testing Machine
JJG 1063 Electro-hydraulic Servo Universal Testing Machines
3 Terms and Definitions
What is defined in GB/T 8541 and GB/T 8845, and the following terms and definitions are
applicable to this document.
3.1 shear
Use two adjacent and mutually parallel cutting edges to cut a material.
3.2 shear force
The resistance of a material to cutting or shearing (3.1).
3.3 maximum shear force
Fm
The maximum force required to cut a material.
3.4 original cross-sectional area
S0
The initial shear-bearing cross-sectional area of one side of the specimen.
3.5 shear strength
τb
The maximum shear stress, to which, a material is subject.
NOTE: in a shear test, the shear strength is the stress obtained by dividing the maximum shear
force by 2 times the original cross-sectional area.
3.6 single-sided clearance
The distance between the side walls of the punch and die edges.
3.7 relative clearance
The percentage of single-sided clearance to specimen thickness.
be Level 1 or superior to Level 1.
7.2 The working surfaces of the upper and lower platens of the testing machine shall be parallel.
The center line of the punch of the mould shall be as consistent as possible with the force
application axis of the testing machine, and the loading shall be continuous, smooth, and
without vibration.
7.3 During the test, various forms of double-sided shear moulds can be used. See Appendix A
for the recommended shear moulds.
7.4 Shearing and supporting materials shall be made of high-strength alloy steel or materials
with sufficient hardness. The hardness of the die and punch shall be 56 HRC ~ 60 HRC, and
the hardness of the blank holder, guide plate and positioning pin shall be 38 HRC ~ 42 HRC.
8 Test Procedures
8.1 Determination of Original Cross-sectional Area
The original cross-sectional area of the specimens shall be calculated in accordance with
Formula (1).
At both ends and in the middle of the specimen, respectively measure the width and thickness,
and take the average value. The resolution of thickness measuring gauge shall be superior to
0.005 mm.
8.2 Inspection of Test Moulds
Before installing the specimen, the impurities in the die cavity shall be inspected and cleaned
up.
8.3 Single-sided Clearance and Punch Selection
8.3.1 The single-sided clearance is selected in accordance with 3.1.2 and 3.1.3 of GB/T 16743-
2010. It is recommended to use the intermediate value of Class II single-sided clearance. The
single-sided clearance shall be calculated in accordance with Formula (2).
8.3.2 The dimensions of the punch edge shall be calculated in accordance with Formula (3).
8.3.3 Place the specimen on the die close to the positioning pin and tightly press it. The blank
holder shall avoid the punch.
8.3.4 Weigh-take the mass (m) of the punch, accurate to 1 g, and calculate the punch weight G1
= 9.8 m.
8.4 Test Speed
The test speed shall comply with the requirements of relevant standards; if there is no such
requirement, 15 mm/min is recommended.
8.5 Zero-point Setting of Measuring System
After assembly of the test loading chain is completed, the zero point of the shear force
measuring system shall be set.
8.6 Application of Force
Apply the test force and record the maximum force indication value F1 when the specimen is
sheared.
8.7 Calculation of Shear Strength
The shear strength (τb) shall be calculated in accordance with Formula (4):
9 Result Processing
9.1 The value of test results shall be rounded off in accordance with the requirements of relevant
product standards. If no specific requirements are specified, the shear strength value shall be
rounded off to 1 MPa in accordance with GB/T 8170.
9.2 If the specimen is bent, incompletely sheared, the shear edge is not perpendicular to the
positioning edge, the cross section is not flush, or the mould is damaged, the test results will be
invalid, and re-sampling shall be conducted for the test.
9.3 Take the arithmetic mean of the shear strength as the reported value.
9.4 Evaluate the uncertainty of the shear test measurement results. See Appendix B for an
example of the evaluation of the uncertainty of the shear test measurement results.
10 Test Report
The test report shall at least include the following main content:
a) Serial No. of this document;
In accordance with Formula (B.3) and Formula (B.4), establish a mathematical model.
Where,
ucrel(τb)---the relative combined uncertainty of shear strength;
urel(Fm)---the relative uncertainty generated by the maximum shear force;
urel(S0)---the relative uncertainty generated by the measurement of the original cross-sectional
area;
urel(rep)---the relative uncertainty generated by repeatability;
urel(τbv)---the relative uncertainty generated by shear rate.
B.2.2 Relative uncertainty urel(rep) generated by repeatability (Type A relative standard
uncertainty)
Type A relative standard uncertainty sub-item mainly considers the relative uncertainty urel(rep)
generated by repeatability, and the repeatability measurement shall comply with Formula (B.5).
Where,
u---the uncertainty;
s---the standard deviation of measurement;
n---the average number of observations for reporting measurement results under normal
circumstances.
This example evaluates the uncertainty of the average measurement value of three specimens,
so it shall be divided by √3, see Formula (B.6).
B.2.3 Evaluation of Type B relative standard uncertainty sub-item urel(Fm) of maximum
shear force (Fm)
B.2.3.1 The relative uncertainty urel(F1) brought by the indication error of the testing machine’s
force measuring system.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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