GB/T 22309-2023 PDF English
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| GB/T 22309-2023 | English | 275 |
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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 22309-2008 | 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 22309-2023: Road vehicles - Brake linings - Shear test method for disc brake pad and drum brake shoe assemblies
---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/GBT22309-2023
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
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This Standard replaces GB/T 22309-2008, Road vehicles - Brake linings - Shear test
procedure for disc brake pad and drum brake shoe assemblies. Compared with GB/T
22309-2008, except for structural adjustment and editorial changes, the main technical
changes are as follows.
a) Change the “Scope” (see Chapter 1; Chapter 1 of the 2008 edition);
b) Change the “Terms and definitions” (see Chapter 3; Chapter 3 of the 2008 edition);
c) Change the “Symbols” (see Chapter 4; Chapter 4 of the 2008 edition);
d) Change “ISO 6314” to “GB/T 26736-2011”; change “used samples” to “used
products (for use in inertia test bench testing or actual vehicle)” (see 5.1; 5.1 of
the 2008 edition);
e) Add “When using a part of the assembly for testing, a load shall be applied in the
radial or tangential direction relative to the vehicle installation position, and the
direction shall be indicated on the test report.” (see 5.2);
f) Change “The edges of the sample shall be able to ensure good contact with the
load and fixture, and the silencer sheet shall be removed” to “If necessary, the
edges of the sample can be processed to ensure good contact with the load and
fixture, and the silencer sheet can be removed before testing.” (see 5.3;5.3 of the
2008 edition);
g) Change the requirements for chamfers and surface areas in the General of Test
fixtures (see 6.2.1; 6.2.1 of the 2008 edition);
h) Add "For linings bonded or molded on the shoe, the maximum distance from the
bonding surface shall be 0.2 mm" (see 6.2.2.1);
i) Change the “Test procedure” (see Chapter 7; Chapter 7 of the 2008 edition);
j) Change the “Calculation of results” (see Chapter 8; Chapter 8 of the 2008 edition);
k) Change the “Test report” (see Chapter 9; Chapter 9 of the 2008 edition).
Please note that some of the contents of this document may involve patents. The issuing
organizations of this document are not responsible for identifying patents.
This document is proposed by China Building Materials Federation.
This document shall be under the jurisdiction of National Technical Committee on Non-
metallic Mineral products of Standardization Administration of China (SAC/TC 406).
Drafting organizations of this document. Shandong Gold Phoenix Co., Ltd., Xianyang
Non-metallic Mineral Research & 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 Automobile Parts Co., Ltd., LPR (zhuhai) Auto Parts Ltd.,
Hebei Xingyue Braking Element Co., Ltd., Bosch Automotive Technical Services
(China) Co., Ltd., Hengshui Zhongcheng Friction Material Co., Ltd., Gucheng County
Saizhishun Brake Parts Co., Ltd., Hangzhou United Friction Material Co., Ltd., Qindao
Huarui Auto Parts Co., Ltd., Hubei Feilong Friction & Sealing Materials Co., Ltd.,
Zhejiang Resistance Technology Co., Ltd., Changchun Chenyu Technology Co., Ltd.,
Zhuhai Grayley Friction Material Co., Ltd., Hebei Tionko Brake Parts Co., Ltd.,
Friction No. 1 Braking Technology (Xiantao) Co., Ltd., Hebei Kaipuda Auto Parts Co.,
Ltd., Ningbo Tianwei Auto Parts Co., Ltd., Hebei Zhengda Attrition Brake Materials
Co., Ltd., Yancheng City Quality and Technical Supervision Comprehensive Inspection
and Testing Center (Yancheng Product Quality Supervision and Inspection Institute),
Shandong Jinli New Material Tech Co., Ltd.
Main drafters of this document. Hou Libing, Sun Peng, Tian Shiguo, Ma Jialang, Chen
Junzhan, Wang Yupeng, Zhen Minghui, Wang Jiayi, Zhang Honglin, Chen Minghui,
Zhao Rong, Liu Xueqing, Wang Jian, Yan Jinchuan, Zhang Guohua, Wang Xiaodong,
Lan Huipu, Lin Renyi, Liu Xianbin, Xu Xiwei, Gao Lianquan, Zhang Zili, Gao Yuhang,
Huang Lianjun, Shen Ranglin, Wang Xiang, Li Linlin, Li Ruifeng, Xia Kejian, Lin
Renhuan, Wang Yanjun, Zhu Qing, Lin Renhe, Zhou Yuanxue.
This document was first published in 2008, and this is the first revision.
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 shear strength
The total load applied during shear failure divided by the bond area.
4 Symbols
Symbols given in Table 1 apply to this document.
5 Sample preparation
5.1 Use products under development, finished products, special treated (see GB/T
26736-2011) or used products (for use in inertia test bench testing or actual vehicle) as
samples.
5.2 Use either an entire assembly or a part of the assembly (cut material) for testing.
When using a part of the assembly for testing, a load shall be applied in the radial or
tangential direction relative to the vehicle installation position, and the direction shall
be indicated on the test report.
5.3 If necessary, the edges of the sample can be processed to ensure good contact with
the load and fixture, and the silencer sheet can be removed before testing.
5.4 When testing the shoe block, the test shearing surface shall cover the entire
assembly or a portion cut along the width of the lining (see Figure 1).
5.5 The number of samples is 5.
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.
In millimeters
6.2.2.2 The direction of load applied by the indenter shall be parallel to the brake shoe
plate. The support of the shoe shall be uniformly loaded along the length of the sample.
The width of indenter shall be greater than the width of lining.
6.2.3 Disc brake pad
The fixture shall be designed according to the following requirements.
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.
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.
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.
g) Test conditions different from those specified in Chapter 5, such as special test
temperature.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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