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GB/T 38795-2020 English PDF (GBT38795-2020)

GB/T 38795-2020 English PDF (GBT38795-2020)

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GB/T 38795-2020: Performance requirements of side airbag and curtain airbag module

This standard specifies the technical requirements and test methods for side airbag modules and curtain airbag modules. This standard applies to the side airbag module and curtain airbag module installed in category M1 vehicles; other types of vehicles can refer to it for implementation.
GB/T 38795-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 43.040.60
T 26
Performance requirements of side airbag and curtain
airbag module
ISSUED ON: JUNE 02, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
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 Deployment requirements for side airbag modules and curtain airbag modules ... 6
5 Sequences of environment and static deployment test of side airbag module and curtain airbag module ... 7
6 Environmental testing ... 9
7 Static unfolding test ... 25
Performance requirements of side airbag and curtain
airbag module
1 Scope
This standard specifies the technical requirements and test methods for side airbag modules and curtain airbag modules.
This standard applies to the side airbag module and curtain airbag module installed in category M1 vehicles; other types of vehicles can refer to it for implementation.
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 standard.
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests (GB/T 10125-2012, ISO 9227:2006, IDT)
GB/T 19949.2 Road vehicle - Airbag components - Part 2: Testing of airbag modules (GB/T 19949.2-2005, ISO 12097-2:1996, IDT)
GB/T 28957.1 Road vehicles - Test dust for filter evaluation - Part 1: Silicon dioxide test dust (GB/T 28957.1-2012, ISO 12103-1:1997, MOD)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Side airbag module; SAB
An airbag module installed in the interior of a car seat or other side interiors, as a passive safety device used to protect the occupants on the side when a car crashes. The side airbag module assembly is composed of, but not
limited to, air bags, air generators, connecting devices, labels, other auxiliary Temperature build-up time
te
The difference of the time taken by the temperature at the defined reference point of the test sample (generally refers to the point where the temperature of the test sample changes the slowest) from the initial temperature to rise or fall to the target temperature and the time taken by the ambient
temperature to rise or fall from the initial temperature to the target
temperature.
3.9
Power spectral density; PSD
Represents the distribution of the power contained in each frequency
component of the random signal in the frequency domain.
Note: Usually expressed in PSD, the unit is the second power of grams per hertz (g2/Hz). The curve graph of its distribution in the frequency domain is called the spectrogram.
4 Deployment requirements for side airbag modules
and curtain airbag modules
4.1 During and after the static deployment test of Chapter 7 for the airbag module, the subcomponents of the module shall not have hard splashes (such as metal parts or plastic parts) caused by the deployment of the airbag. If there is a falling hard object, it shall not fall towards the occupant side.
4.2 During and after the static deployment test of the airbag module in Chapter 7, it is neither allowed to have any rupture or burning on the contact surface between the airbag and the occupant, nor small holes with a diameter greater than 3 mm are allowed in other locations; if the holes are less than 3 mm, the quantity shall not exceed 3 and the adjacent holes shall not be connected. 4.3 During and after the static deployment test of the airbag module in Chapter 7, the air bag shall neither disconnect from the test tooling or the vehicle position, nor can there be a looseness that affects the function of the airbag.
4.4 During and after the static deployment test of airbag module in Chapter 7, the sewing line of the airbag shall be in an intact state; the number of continuous disengagement of the stitches of the sewing line shall not be more than 3. If the airbag is an integrated airbag, no damage shall occur at the seam.
4.5 During the static deployment test of airbag module in Chapter 7, the airbag of the airbag module shall be able to be deployed in place in accordance with the shape required by the design within the specified time, meanwhile reach the protection area required by the design.
4.6 The difference between the inflation time of the airbag module with treatment of the environmental test and without treatment of the environmental test shall be within the error range of the design requirements.
5 Sequences of environment and static deployment
test of side airbag module and curtain airbag module
5.1 Table 1 shows all the test items of 36 identical test samples, "X" indicates the test samples that need to be subject to this test item.
5.2 The test samples corresponding to each test item include the left and right sides, meanwhile the number of test samples on the left and right sides are equal. "L" means the left test sample, "R" means the right test sample. 5.3 Each test sample shall be tested in the order of the test items required in Table 1. The test order of temperature vibration test and thermal humidity cycle test can be reversed, whilst the test order of the remaining test items cannot be changed. After the high damp heat aging test is completed, a static unfolding test shall be carried out within 168 h.
5.4 The test items and test sequence are determined according to the life cycle of the airbag module and the possible failure mechanisms as described in 5.5 and 5.6.
5.5 The influence and possible failure mechanism of the drop test, mechanical shock test, dust test, temperature vibration test, cyclic damp heat test, salt spray test and temperature shock test on the airbag module are as described in GB/T 19949.2.
5.6 Low damp heat aging test and high damp heat aging test respectively simulate the aging resistance of the airbag module in continuous high
temperature weather or high temperature and high humidity weather.
6 Environmental testing
6.1 Drop test
6.1.1 Overview
The purpose of this test is to assess whether the intact of the module can be maintained when the complete airbag module falls from the specified height and direction.
6.1.2 Equipment
Place the steel plate with the minimum size of 1 m ?? 1 m ?? 10 mm on the horizontal ground; use a fixing jig for fixing the sample at the specified height. 6.1.3 Test samples
According to the sequence given in Table 1, perform the test for 8 airbag modules.
6.1.4 Test conditions
Drop height: m;
The ambient temperature of the test: (23 ?? 5) ??C.
6.1.5 Test procedure
Install the test sample 1 on the fixed fixture at the specified height above the collision plate; fix it according to one of the six directions as indicated in Figure 1.
Release the module and allow it to fall freely onto the collision plate. Repeat the test with samples 2 ~ 6; each sample falls in different directions as follows. For test samples 2 ~ 6, proceed in one of the directions as specified in Figure 1 but not yet used in the previous test.
For the test samples 7 ~ 8, choose a random direction for the test.
6.3.4 Test conditions
The airbag module is placed in the dust bin. A certain interval shall be kept between the modules. Each module is fully exposed to the dust.
6.3.5 Test procedure
Place the airbag module in the test box. Stir the dust every 20 minutes for 5 s during the 5 h test period. This is achieved by oil-free and water-free compressed air with a pressure of (550 ?? 50) kPa as ejected from a nozzle which has a diameter of (1.5 ?? 0.1) mm.
6.3.6 Determination of test results
After the test is completed, the airbag module shall maintain intact, and any observable damage shall be recorded. Even if there is obvious damage, the test can continue according to Table 1. In order to make the test run smoothly, the damaged parts that hinder the installation can be repaired. If it cannot be repaired, the test is terminated. After each test is completed, measure and record the value of the ignition resistance, which must meet the design requirements.
6.4 Temperature vibration test
6.4.1 Overview
The purpose of this test is to assess the ability of the airbag module to withstand the combined effects of vibration and temperature.
6.4.2 Equipment
A vibrating bench installed in an environment box that can maintain the temperature specified in Figure 6, which is able to generate the vibration load as specified in Table 4.
6.4.3 Test sample
According to the sequence given in Table 1, perform test for 8 airbag modules. 6.4.4 Test conditions
6.4.4.1 Vibration load
Apply random vibration loads as shown in Figure 5 and Table 4. Or otherwise use the vibration load that is stricter and more specific to the vehicle or driving conditions than Table 4, depending on the agreement between the supplier and the buyer of the airbag module.
the vibration load as specified in the direction of each main axis of the coordinate system as shown in Figure 1 for a duration of 24 hours. During this period, the temperature in the environmental chamber shall meet the
requirements of 6.4.4.2.
6.4.6 Determination of test results
After the test is completed, the airbag module shall maintain intact, and any observable damage shall be recorded. Even if there is obvious damage, the test can continue according to Table 1. In order to make the test run smoothly, the damaged parts that hinder the installation can be repaired. If it cannot be repaired, the test is terminated. After each test is completed, measure and record the value of the ignition resistance, which must meet the design requirements.
6.5 Cyclic damp heat test
6.5.1 Overview
The purpose of this test is to assess the ability of the airbag module to withstand changes in temperature and humidity.
6.5.2 Equipment
An environmental chamber capable of cyclic temperature and humidity control. 6.5.3 Test samples
According to the sequence given in Table 1, perform test for 8 airbag modules. 6.5.4 Test conditions
The temperature, relative humidity, duration of the environmental chamber are as shown in Figure 7, where the temperature tolerance is ??2.5 ??C.
6.6 Salt spray test
6.6.1 Overview
The purpose of this test is to assess the corrosion resistance of the airbag module.
6.6.2 Equipment
6.6.2.1 Salt spray chamber
The salt spray chamber shall be made of materials that do not affect the corrosion effect. As long as the conditions are met, the detailed composition of the salt spray chamber, including the method of generating salt spray, can be arbitrarily selected:
a) The conditions of the salt spray chamber are within the limits;
b) Large enough volume and constant conditions (not affected by eddy
currents and test samples);
c) The mist is not sprayed directly on the sample;
d) The droplets condensed on the top, sides and other parts cannot drop onto the sample;
e) Evenly distribute the salt spray and properly ventilate to prevent the pressure in the chamber from rising;
f) Ventilation outlets are protected against strong air currents that may cause air flow in the chamber.
6.6.2.2 Sprayer
The structure of the sprayer shall ensure that the spray with proper
concentration and humidity is produced. It shall be made of materials that are not susceptible to salt decomposition.
6.6.2.3 Sprayed liquid
The sprayed liquid cannot be recycled.
6.6.2.4 Air supply
If the air entering the sprayer is compressed air, the compressed air shall not contain any impurities, such as oil, dust, etc.
The air pressure shall enable each sprayer to produce the spray described in 6.6.2.2.
Figure 10 -- Salt spray cycle
6.6.5 Test procedure
Place the sample in the salt spray chamber. The curtain airbag module needs to be straightened and flattened to fully accept the soaking.
Perform salt spray at 30 ??C ~ 35 ??C according to 6.6.4.
Any exposed area shall be sprayed, to ensure that a clean collection container with a horizontal collection area of 80 cm2 placed in any exposed area can collect an average of 1 mL ~ 2 mL of salt solution per hour during the collection period. At least 2 collection containers shall be used. The collection container shall be placed in a place not covered by the sample, so as to avoid the collection of condensate from other substances.
The samples shall not be in contact with each other or other metal parts, that is, the samples shall be placed so as to avoid any influence between them. After the last storage period, use a wet sponge to wipe off the salt water on the sample; place it in (55 ?? 2) ??C air to dry for 1 h.
6.6.6 Determination of test results
After the test is completed, the airbag module shall maintain intact, and any observable damage shall be recorded. Even if there is obvious damage, the test can continue according to Table 1. In order to make the test run smoothly, the damaged parts that hinder the installation can be repaired. If it cannot be repaired, the test is terminated. After each test is completed, measure and record the value of the ignition resistance, which must meet the design requirements.
6.7 Temperature shock test
6.7.1 Overview
The purpose of this test is to assess the ability of the airbag module to withstand more frequent temperature changes.
6.7.2 Equipment
Two temperature test chambers with air circulation capability.
6.7.3 Test sample
In accordance with the sequence given in Table 1, perform test for 4 airbag modules.
6.8.2.4 Test conditions
The temperature and relative humidity of the environment chamber:
temperature (70 ?? 2.5) ??C; humidity (95 ?? 5)%.
6.8.2.5 Test procedure
Place the airbag module in the environment chamber. Each airbag module shall be placed flat, not in contact with each other or the wall of the chamber, stored for 408 h according to the requirements of 6.8.2.4.
6.8.2.6 Determination of test results
After the test is completed, the airbag module shall maintain intact. After the test is completed, the value of the ignition resistance is measured and recorded. The ignition resistance must meet the design requirements.
7 Static unfolding test
7.1 Static unfolding at low temperature
The airbag module shall be fixed to the fixture or vehicle in the same way as the actual vehicle installation.
The airbag module shall be stored at (-35 ?? 2.5) ??C for not less than 4 h, or pre- processed according to the temperature build-up time te of 6.5.6 to make the core temperature of the generator reach the required test temperature; the storage time shall not exceed 8 h.
The airbag module needs to burst within (23 ?? 5) ??C within 2 minutes. The burst current is 1.2 A and the duration is 2 ms or the burst current is 1.75 A and the duration is 0.5 ms. During the test, high-speed cameras (at least 2000 frames/s) shall be used to photograph all areas of the unfolding of the side airbag module and the entire inflation process from the front (the direction of airbag unfolding) and the side.
7.2 Static unfolding at room temperature
The airbag module shall be fixed to the fixture or vehicle in the same way as the actual vehicle installation.
The airbag module needs to burst within (23 ?? 5) ??C. The burst current is 1.2 A and the duration is 2 ms or the burst current is 1.75 A and the duration is 0.5 ms. During the test, high-speed cameras (at least 2000 frames/s) shall be used to photograph all areas of the unfolding of the curtain airbag module and the entire inflation process from the front (the direction of airbag unfolding) and the

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