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GB/T 5137 consists of 5 parts under the general title Test methods of safety glazing materials used on road vehicles:
——Part 1: Mechanical properties tests;
——Part 2: Optical properties tests;
——Part 3: Radiation, high temperature, humidity, fire and simulated weathering resistance tests;
——Part 4: Determination of solar characteristic;
——Part 5: Resistant-to-Chemical and resistant-to-temperature changes test.
This is Part 1 of GB/T 5137.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 5137.1—2002 Test methods of safety glazing materials used on road vehicles——Part 1: Mechanical properties tests; In addition to editorial changes, the following main technical changes have been made with respect to GB/T 5137.1-2002:
——Requirements for placement of plastic materials before testing have been added (see Table 1 in 5.3);
——Impact height requirement has been added in the steel ball test (see Table 2 of 5.4.1 and 6.4);
——Requirements for wheel hardness in abrasion resistance test are modified (see 7.2.1; 7.2.2 of Edition 2002).
——Head-form impact test with deceleration measurement is added (see 9.2);
——Cross cut test is added (see Clause 10);
——Flexibility and folding are added (see Clause 11);
This standard has been redrafted and modified in relation to ISO 3537: 2015 Road vehicles — Safety glazing materials — Mechanical tests.
This part has been changed largely from ISO 3537:2015 in terms of structure. See Annex A for the comparison between this part and ISO 3537:2015 in clause No.
This part includes technical differences with respect to ISO 3537:2015. The clauses and subclauses concerned are identified by a vertical single line (|) located in the blank on its external margin of the page. These technical changes and reasons are listed in Annex B.
The following editorial changes have been made in this part:
——The standard name is modified.
This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This part is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this part are as follows:
——GB 5137.1-1985, GB/T 5137.1-1996 and GB/T 5137.1-2002.
Test methods of safety glazing materials used on road vehicles— Part 1: Mechanical properties tests
1 Scope
This part of GB/T5137 specifies the test methods for safety glazing materials used on road vehicle, including impact resistance test, penetration resistance test, abrasion resistance test, fragmentation test, head-form impact test, cross cut test, flexibility and folding test.
This part is applicable to the test of safety glazing materials used on road vehicle.
2 Normative references
The following referenced documents are indispensable for the application 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.
QC/T 1119 Road vehicles—Safety glazing materials—Vocabulary (QC/T 1119—2019, ISO 3536: 2016, MOD)
ISO 6487 Road vehicles—Measurement techniques in impact tests—Instrumentation
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in QC/T 1119 apply.
4 Test conditions
Unless otherwise specified, the tests shall be carried out under the following conditions:
a) Ambient temperature: 20°C±5°C;
b) Atmospheric pressure: 8.60×104 Pa–1.06×105 Pa;
c) Relative humidity: 40%–80%.
5 Impact resistance test (227g ball test)
5.1 Test objectives
Determination of whether the safety glazing material has a certain minimum strength and cohesion under impact from a small hard object.
5.2 Test apparatus
5.2.1 Steel ball
Hardened steel ball, with a mass of 227 g ± 2 g and a diameter of approximately 38 mm.
5.2.2 Dropping device
Means for dropping the ball freely from a height to be specified. When the impact height is less than or equal to 6 m, the point of impact shall be within 25 mm of the geometric centre of the test piece; when the impact height is greater than 6 m, the point of impact shall be within 50 mm of the geometric centre of the test piece.
5.2.3 Supporting fixture of test piece
It consists of three parts: upper frame, lower frame and steel box, all of which are square, as shown in Figure 1. Two steel frames, with a wall thickness of 15 mm and a height of 23 mm, with machined borders, faced with rubber gaskets about 3 mm±0.5 mm thick and 15 mm±1 mm wide, of hardness A (50±5). The test piece is located between the upper and lower frames.
The lower frame rests on a steel box. The steel box is made by welding 12 mm thick steel bottom plate with 10 mm thick side plate, resting on the floor, with an interposed sheet of rubber, about 3mm±0.5mm thick, of hardness A(50±5).
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Impact resistance test (227g ball test)
6 Penetration resistance test (2260g steel ball test)
7 Abrasion resistance test
8 Fragmentation test
9 Head-form impact test
10 Cross cut test
11 Flexibility and folding test
Annex A (Informative) Structural comparison between this part and ISO 3537:
Annex B (Informative) Technical differences between this part and ISO 3537:2015 and their causes
