GB/T 22309-2023_English: PDF (GB/T22309-2023)
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Road vehicles -- Brake linings -- Shear test method for disc brake pad and drum brake shoe assemblies
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GB/T 22309-2023
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| GB/T 22309-2008 | English | 125 |
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Road vehicles -- Brake linings -- Shear teat procedure for disc brake pad and drum brake shoe assemblies
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GB/T 22309-2008
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| Standard ID | GB/T 22309-2023 (GB/T22309-2023) | | Description (Translated English) | Road vehicles -- Brake linings -- Shear test method for disc brake pad and drum brake shoe assemblies | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q69 | | Classification of International Standard | 43.040.40 | | Word Count Estimation | 14,157 | | Date of Issue | 2023-12-28 | | Date of Implementation | 2024-07-01 | | Older Standard (superseded by this standard) | GB/T 22309-2008 | | Drafting Organization | Shandong Jinqilin Co., Ltd., Xianyang Non-metallic Mineral Research and Design Institute Co., Ltd., Dongying Baofeng Auto Parts Co., Ltd., Haiyan Ouyate Auto Parts Co., Ltd., Zhejiang Hangmo Ouyi Auto Parts Co., Ltd., Tonglu Yuxin Auto Parts Co., Ltd. , Lipaier (Zhuhai) Auto Parts Co., Ltd., Hebei Xingyue Brake Components Co., Ltd., Bosch Automotive Technical Services (China) Co., Ltd., Hengshui Zhongcheng Friction Materials Co., Ltd., Gucheng County Saizhishun Brake Components Co., Ltd. , Hangzhou Youna Friction Materials Co., Ltd., Qingdao Huarui Auto Parts Co., Ltd., Hubei Feilong Friction Sealing Materials Co., Ltd., Zhejiang Resistance Technology Co., Ltd., Changchun Chenyu Technology Co., Ltd., Zhuhai Greili Friction Materials Co., Ltd. Co., Ltd., Hebei Tiantuo Brake Pad Co., Ltd., Friction No.1 | | Administrative Organization | National Technical Committee on Standardization of Non-metallic Mineral Products and Products (SAC/TC 406) | | Proposing organization | China Building Materials Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 22309-2008 (GB/T22309-2008) | | Description (Translated English) | Road vehicles - Brake linings - Shear teat procedure for disc brake pad and drum brake shoe assemblies | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q69 | | Classification of International Standard | 43.040.40 | | Word Count Estimation | 13,173 | | Date of Issue | 2008-08-20 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | JC/T 472-1992 | | Quoted Standard | GB/T 5620 | | Adopted Standard | ISO 6312-2001, IDT | | Drafting Organization | Xianyang Institute of Non-metallic Minerals | | Administrative Organization | National Non-metallic mineral products and products for Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2008 No.14 (Total No.127) | | Proposing organization | China Building Materials Federation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the terms automobile brake pads (shoes) assembly shear strength tests, sample preparation, test procedure, , test equipment and fixtures, such as the results of the calculation and the content of the report. This standard applies to the overall molding or bonding automotive disc brake pad assemblies and drum brake shoe assembly Determination of shear strength. This standard applies to automobile brake pads riveting (shoe) assembly measured shear strength. |
GB/T 22309-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
CCS Q 69
Replacing GB/T 22309-2008
Road vehicles - Brake linings - Shear test method for disc
brake pad and drum brake shoe assemblies
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JULY 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Symbols ... 7
5 Sample preparation ... 7
6 Test equipment and fixtures ... 8
7 Test procedure ... 11
8 Calculation of results ... 11
9 Test report ... 12
Appendix A (Informative) Test flow chart ... 14
Appendix B (Informative) Format of test report ... 15
References ... 16
Road vehicles - Brake linings - Shear test method for disc
brake pad and drum brake shoe assemblies
1 Scope
This document describes the sample preparation, test equipment and fixtures, test
procedure, calculation of results and test report for the shear strength test method for
disc brake pad assembly and drum brake shoe assembly.
This document applies to the determination of shear strength of automotive disc brake
pad assembly and drum brake shoe assembly that are integrally molded, bonded, or
fitted using the two types of systems. This document is not applicable to the
determination of shear strength of riveted automobile brake pad (shoe) assemblies.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
edition cited applies; for undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 5620, Road vehicles - Vocabulary and definition for braking of automotive
vehicles and their trailers
3 Terms and definitions
Terms and definitions determined by GB/T 5620, as well as the following, are
applicable to this document.
3.1
lining
Friction material component of the brake assembly.
3.2
bond area
Contact area between the lining and the back plate or shoe.
3.3
Note: During the test, the shear force loaded on the sample and the auxiliary pressure
acting on the sample are of inconsistent directions. If the groove is inclined or
higher than the back plate, the test results will be affected.
Figure 1 – Sample of drum brake shoe assembly segment
6 Test equipment and fixtures
6.1 Test equipment
6.1.1 The test equipment shall be a press or tensile machine or similar machine (such
as a shear testing machine) which applies sufficient shear force by driving the indenter.
6.1.2 The test equipment shall be provided with a recording device, which can correctly
record the instantaneous failure shear force.
6.1.3 The test equipment shall be capable of controlling the loading rate so that the
average loading rate is (4 500 ± 1 000) N/s (depending on the vehicle type being
evaluated). If a constant-speed crosshead testing machine is used, the crosshead speed
is (10 ± 1) mm/min. Record the category of control of the testing machine (loading rate
or crosshead speed) on the test report, so that the results can be compared between
different test equipment. Avoid any impact load during the test.
6.2 Test fixtures
6.2.1 General
The shear test fixture shall be able to hold the sample and be parallel to the indenter. To
avoid sharp edges, the part of the fixture in contact with the sample shall be rounded
with a radius of no more than 2 mm. If a specific radius is used, record it in the test
report to avoid deviation from the test procedure. If the surface area of the fixture
contains draft angles, indicate it in the test report.
6.2.2 Drum brake shoe assembly
6.2.2.1 The fixture shall be designed such that the indenter is in consistent contact with
the contour surface of the lining along the length direction and has a gap of (1 ± 0.2)
mm from the arc surface of the drum brake shoe (see Figure 2). For the lining bonded
or molded to the shoe, the maximum distance from the bonding surface shall be 0.2 mm.
c – surface load;
d – the minimum friction on the contact surface;
e – not greater than the thickness of the back plate.
Figure 3 – Disc brake pad test fixture
7 Test procedure
7.1 Carry out the test at room temperature of (23 ± 5) ℃. If testing under other
environmental conditions is required, an agreement shall be reached with the customer.
7.2 When a high-temperature shear test is required, the sample shall be placed in an
oven, heated evenly from room temperature to the test temperature within (30 ± 2)
minutes, and then taken out of the oven, which shall be completed within 60 s. The test
temperature of drum brake lining is (200 ± 10) ℃, and the test temperature of disc brake
pad is (300 ± 10) ℃.
7.3 Place the drum brake shoe or disc brake pad in the appropriate shear test fixture in
the direction indicated by the test (radial or tangential).
7.4 Apply load at the rate specified in 6.1 until the sample fails.
7.5 Record the failure load and express the residual area of the friction material after
the shear test of the disc brake pad or drum shoe as a percentage in accordance with the
provisions of Chapter 9. Evaluate the fracture surfaces at the uncut edge (2 mm from
the brake pad or shoe profile) and the core area, respectively. If there is any objection
to the visual evaluation, use the following reference scheme for analysis (optional):
-- Mix to prepare 1.0 L of reference solution: 80 g of CuSO4, 30 g of NaCl, 100 mL of
0.01 mol/L HCl (adding 0.364 6 g of HCl to 1 L of solution), add distilled water or
deionized water to make the total volume of the solution 1.0 L;
-- Immerse the back plate into the reference solution for 5 seconds;
-- Evaluate the fracture condition and record it as follows: When the reference solution
does not dye the broken surface brown, the material has broken; If there is bond
failure between the glue and the back plate, regular and uniform brown will appear
on the broken surface.
7.6 See Appendix A for the test procedure.
8 Calculation of results
8.1 Calculate the shear strength according to Formula (1):
8.2 Calculate A based on the friction material bonding profile instead of the pad surface,
and remove the grooves. Express the shear strength by the minimum value and the
average value of samples.
9 Test report
The test report (see Appendix B) shall include the following contents.
a) Product model, supplier and batch number of drum brake shoe assembly or disc brake
pad assembly.
b) Type of sample and direction of loading, when testing using a part of the assembly
or a prepared sample.
c) Number of samples.
d) Minimum and average values of shear force, or minimum and average values of shear
strength, or all of the above.
e) Fixture with/without draft angle.
f) Expression of the shear test results (evaluated with reference to the shear fracture
diagram in Figure 4), including the following information:
1) Failure percentage (smooth surface, bonding layer and lining layer);
2) Area and location of smooth surface area.
g) Test conditions different from those specified in Chapter 5, such as special test
temperature.
......
GB/T 22309–2008
ICS 43.040.40
Q 69
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
GB/T 22309-2008 / ISO 6312: 2001
Road vehicles - Brake linings - Shear test procedure
for disc brake pad and drum brake shoe assemblies
(ISO 6312: 2001, IDT)
ISSUED ON: AUGUST 20, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China
Table of Contents
Foreword ... 3
ISO FOREWORD ... 4
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and definitions ... 6
4 Symbols and units ... 7
5 Sample preparation ... 7
6 Test equipment and fixtures ... 8
7 Test steps ... 12
8 Calculation of test result ... 12
9 Contents of test report ... 13
Annex A (Normative) Test procedure flow chart ... 15
Annex B (Informative) Test report ... 17
Bibliography ... 19
Foreword
This Standard equivalently adopts International Standard ISO 6312: 2001 Road vehicles
— Brake linings — Shear test procedure for disc brake pad and drum brake shoe
assemblies.
Compared with ISO 6312: 2001, the main changes of this Standard are as follows:
— CHANGE the “this test method” as “this Standard”;
— REPLACE the “ISO 611” by GB/T 5620 in this Standard;
— This Standard adopts international system of units (SI).
Annex A of this Standard is normative and annex B is informative.
This Standard is proposed by China Building Material Federation.
This Standard is under the jurisdiction of National Technical Committee (SAC/TC 406) on
Non-metallic Mineral Products of Standardization Administration of China.
The responsible drafting organization is: Xianyang Non-metallic Mineral Research &
Design Institute.
The participating drafting organizations are: Shandong Gold Phoenix Co., Ltd, Hangzhou
Hangcheng Friction Material Co., Ltd, Fujian Guanliang Auto Parts Industry Co., Ltd,
Dongying Xinyi Auto Parts Co., Ltd, and Hubei Feilong Friction Sealing Material Co., Ltd.
The chief drafting staffs of this Standard: Shi Zhigang, Wang Guangxing, Huang Shunmin,
Zhang Shishao, Du Dongsheng, Zhang Wenqiang, and Zhu Mianpeng.
Since implementation date of this Standard, JC/T 472-1992 Road vehicles - Brake linings
- Shear test procedure for disc brake pad and drum brake shoe assemblies shall be
abolished simultaneously.
Road vehicles - Brake linings - Shear test procedure
for disc brake pad and drum brake shoe assemblies
1 Scope
This Standard specifies vehicle brake pad (shoe) assemblies’ shear strength test – terms,
sample preparation, test equipment and fixtures, test steps, result calculation, and report
contents etc.
This Standard is applicable to determination of shear strength of integral molded or
bonded vehicle disc brake pad assemblies and drum brake shoe assemblies. This
Standard is applicable to determination of shear strength of riveted vehicle brake pad
(shoe) assemblies.
2 Normative References
The articles contained in the following documents become part of this Standard when they
are quoted herein. For the dated documents so quoted, all the modifications (excluding
corrections) or revisions made thereafter shall not be applicable to this Standard. For the
undated documents so quoted, the latest editions shall be applicable to this Standard.
GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary
(GB/T 5620-2002, ISO 611: 1994, IDT)
3 Terms and definitions
For the purpose of this Standard, the following terms and definitions, and those given in
GB/T 5620 shall apply.
3.1 lining
The friction material used to manufacture brake lining assembly.
3.2 carrier
The component of brake pad assembly, it is used to attach or rivet brake lining.
Where:
- Shear strength, unit is megapascals (MPa);
F – Failure shear force, unit is newton (N);
A – Sample’s area, unit is square millimeters (mm2).
8.2 Calculate A according to the bonded-line of friction material contour, instead of disk
pad’s surface, and bevel and groove shall be excluded. The shear strength shall be
expressed by the minimum value and the average value of test samples.
9 Contents of test report
The test report (see Appendix B.1) shall include the following contents:
a) Type, supplier and batch identification of the brake shoe assembly or disc brake pad
friction material;
b) Quantity of test samples (5 recommended);
c) Minimum value and average value of shear-force, or the minimum value and average
value of shear-strength, or both;
d) Shear pattern shall be expressed as follows:
1) Failure percentage;
— Glossy surface;
— Adhesive layer,
— Lining layer.
2) Area and location of glossy zone.
e) When it is different from the normal test conditions, it shall provide explanation
......
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