GB/T 38528-2020 English PDF (GB/T38528-2020)

GB/T 38528-2020: Evaluating Impact Resistance for Passenger Car Tyres
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GB/T 38528-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
G 41
Evaluating Impact Resistance for Passenger Car Tyres
ISSUED ON: MARCH 06, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Evaluation Requirements ... 6
5 Test Methods ... 7
6 Judgment Rules ... 9
7 Test Report ... 10
Appendix A (Normative) Striker, Striker Bracket and Striker Assembly ... 11
Appendix B (Informative) Measuring Instrument of Impact Bulge ... 13
Evaluating Impact Resistance for Passenger Car Tyres
1 Scope
This Standard specifies the evaluation requirements, test methods, judgment rules and
test reports of the impact resistance performance of pendulum method car tires.
This Standard is applicable to the new 30 series to 65 series pneumatic tubeless car
tires; and is not applicable to run-flat tires and spare tires for temporary use only.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 2978 Size Designation, Dimensions, Inflation Pressure and Load Capacity
for Passenger Car Tyres
GB/T 3487 Rims for Passenger Car
GB/T 6326 Tyre Terms and Definitions
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 30195 Test Method for Measuring Impact Performance of Motor Vehicle
Tyres
HG/T 2177 Appearance Quality of Tyres
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 6326 and
GB/T 30195 and the following apply.
3.1 Striker angle
The angle BETWEEN the intersection of the center plane of the striker and the front
5.2 Test conditions and test preparation
5.2.1 The test tire shall be placed for more than 24h after vulcanization; and its
appearance quality shall meet the requirements of HG/T 2177.
5.2.2 The test ambient temperature is 20°C ~ 30°C.
5.2.3 The test rim shall be a special machined steel rim that is used for the impact
resistance test of car tires; and its specifications and models shall be consistent with
the measurement rim specified in GB/T 2978. The tires that are used for vehicles
equipped with flexible rims shall use the same flexible rims as required by the vehicle
for testing; and explain in the test report.
5.2.4 Install the test tire on the test rim specified in 5.2.3 and fill it with 200kPa air
pressure. Lubricants may be used when installing tires.
5.2.5 The inflated tire rim assembly shall be placed at the test environment temperature
for more than 3h.
5.2.6 Determine 5 test points that are approximately equally spaced along the tire
circumferential direction; and mark and number them one by one.
5.2.7 The striker angle of the tire impact resistance testing machine is fixed at a camber
angle of 6°, a slip angle of 0°, and a deviation of ± 0.5°.
5.3 Test procedures
5.3.1 Re-adjust the air pressure of the test tire after placement to the air pressure
specified in 5.2.4, the deviation shall not exceed ± 2kPa. If there is abnormal loss of
the air pressure of the test tire after placement, observe the condition of the test tire
and rim and the re-prepare the test tire.
5.3.2 Install the test tire rim assembly with calibrated air pressure on the test device
according to the provisions of GB/T 30195; and lock the rim so that it cannot rotate in
the circumferential direction. Perform the test point by point according to the marked
serial number.
5.3.3 Adjust the swing lever to the free hanging state; make the rotation center of the
tire and the top of the striker on the same horizontal line; and adjust the position of the
tire laterally in the horizontal direction, so that the shoulder of the tire touches the
middle of the striker. The angular displacement of the swing lever due to the tire
touching the striker shall not exceed 0.1°.
5.3.4 Raise the striker so that its impact energy is equal to the minimum impact bulge
energy specified in 4.2; and then lock the swing lever.
5.3.5 Let the striker fall freely from the locked position and hit the test tire. When the
cracking, or cord fabric exposure in the appearance inspection during or after the
test process;
c) At any impact point, the rim leaks due to impact damage during the test, the tire
continues to leak during inflation after replacing the rim according to 5.3.10; or
15min after inflation, check that the pressure loss exceeds 5% of that specified
in 5.2.4; or there is a crack or impact bulge greater than or equal to 1mm;
d) At any impact point, the height of the impact bulge is greater than or equal to
1mm;
e) The impact bulge height at each impact point is less than 1mm, but after standing
for 30min according to the provisions of 5.3.9, any one with the impact bulge
height greater than or equal to 1mm.
7 Test Report
The test report shall include the following:
a) The name, trademark, specification and production number of the manufacturer
of the test tire;
b) The load index, load capacity, speed symbol, material structure, etc. of the test
tire;
c) The specification of the test rim;
d) Laboratory ambient temperature;
e) Test standard number and test date;
f) Test air pressure;
g) Impact bulge height (including 0mm), robustness factor f, and impact energy of
each test point of the impact-resistant test tire;
h) The air pressure after the impact on each test point of the tire, photos of abnormal
appearance, impact bulge, and air leakage;
i) Other unexpected conditions during the test;
j) Evaluation results.
GB/T 38528-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
G 41
Evaluating Impact Resistance for Passenger Car Tyres
ISSUED ON: MARCH 06, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Evaluation Requirements ... 6
5 Test Methods ... 7
6 Judgment Rules ... 9
7 Test Report ... 10
Appendix A (Normative) Striker, Striker Bracket and Striker Assembly ... 11
Appendix B (Informative) Measuring Instrument of Impact Bulge ... 13
Evaluating Impact Resistance for Passenger Car Tyres
1 Scope
This Standard specifies the evaluation requirements, test methods, judgment rules and
test reports of the impact resistance performance of pendulum method car tires.
This Standard is applicable to the new 30 series to 65 series pneumatic tubeless car
tires; and is not applicable to run-flat tires and spare tires for temporary use only.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 2978 Size Designation, Dimensions, Inflation Pressure and Load Capacity
for Passenger Car Tyres
GB/T 3487 Rims for Passenger Car
GB/T 6326 Tyre Terms and Definitions
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 30195 Test Method for Measuring Impact Performance of Motor Vehicle
Tyres
HG/T 2177 Appearance Quality of Tyres
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 6326 and
GB/T 30195 and the following apply.
3.1 Striker angle
The angle BETWEEN the intersection of the center plane of the striker and the front
5.2 Test conditions and test preparation
5.2.1 The test tire shall be placed for more than 24h after vulcanization; and its
appearance quality shall meet the requirements of HG/T 2177.
5.2.2 The test ambient temperature is 20°C ~ 30°C.
5.2.3 The test rim shall be a special machined steel rim that is used for the impact
resistance test of car tires; and its specifications and models shall be consistent with
the measurement rim specified in GB/T 2978. The tires that are used for vehicles
equipped with flexible rims shall use the same flexible rims as required by the vehicle
for testing; and explain in the test report.
5.2.4 Install the test tire on the test rim specified in 5.2.3 and fill it with 200kPa air
pressure. Lubricants may be used when installing tires.
5.2.5 The inflated tire rim assembly shall be placed at the test environment temperature
for more than 3h.
5.2.6 Determine 5 test points that are approximately equally spaced along the tire
circumferential direction; and mark and number them one by one.
5.2.7 The striker angle of the tire impact resistance testing machine is fixed at a camber
angle of 6°, a slip angle of 0°, and a deviation of ± 0.5°.
5.3 Test procedures
5.3.1 Re-adjust the air pressure of the test tire after placement to the air pressure
specified in 5.2.4, the deviation shall not exceed ± 2kPa. If there is abnormal loss of
the air pressure of the test tire after placement, observe the condition of the test tire
and rim and the re-prepare the test tire.
5.3.2 Install the test tire rim assembly with calibrated air pressure on the test device
according to the provisions of GB/T 30195; and lock the rim so that it cannot rotate in
the circumferential direction. Perform the test point by point according to the marked
serial number.
5.3.3 Adjust the swing lever to the free hanging state; make the rotation center of the
tire and the top of the striker on the same horizontal line; and adjust the position of the
tire laterally in the horizontal direction, so that the shoulder of the tire touches the
middle of the striker. The angular displacement of the swing lever due to the tire
touching the striker shall not exceed 0.1°.
5.3.4 Raise the striker so that its impact energy is equal to the minimum impact bulge
energy specified in 4.2; and then lock the swing lever.
5.3.5 Let the striker fall freely from the locked position and hit the test tire. When the
cracking, or cord fabric exposure in the appearance inspection during or after the
test process;
c) At any impact point, the rim leaks due to impact damage during the test, the tire
continues to leak during inflation after replacing the rim according to 5.3.10; or
15min after inflation, check that the pressure loss exceeds 5% of that specified
in 5.2.4; or there is a crack or impact bulge greater than or equal to 1mm;
d) At any impact point, the height of the impact bulge is greater than or equal to
1mm;
e) The impact bulge height at each impact point is less than 1mm, but after standing
for 30min according to the provisions of 5.3.9, any one with the impact bulge
height greater than or equal to 1mm.
7 Test Report
The test report shall include the following:
a) The name, trademark, specification and production number of the manufacturer
of the test tire;
b) The load index, load capacity, speed symbol, material structure, etc. of the test
tire;
c) The specification of the test rim;
d) Laboratory ambient temperature;
e) Test standard number and test date;
f) Test air pressure;
g) Impact bulge height (including 0mm), robustness factor f, and impact energy of
each test point of the impact-resistant test tire;
h) The air pressure after the impact on each test point of the tire, photos of abnormal
appearance, impact bulge, and air leakage;
i) Other unexpected conditions during the test;
j) Evaluation results.