Non Auto

Automotive Materials Testing nonmetallic

Abstract: The article presents some evidence of non-metallic materials in the automotive industry, materials including interior fogging on the windshield, the gas permeability capacity fuel tank, capacity of gas permeability safety materials, capacity gas barrier of the inner tube and the air bag safety, and so on. Besides these, there are the objectives of testing these items Test, test methods and testing standards, etc.
keywords: automotive materials, non-metallic test

1. Information general

As the technology performance and processing of nonmetallic materials are advancing by leads and bounds, non-metallic materials apply to cars with an unprecedented speed. The average consumption of non-metallic materials by car has increased from 68.4 kg in 1981 to the present 150? 180kilos. With the growing application of non-metallic materials in cars, requirements on the corresponding properties of these materials are presented. For example, the emission of hazardous and noxious substances in the automotive interior trims and materials harmful to health. Condensation of volatile materials on the screen Winder affect driving safety. Gas permeability capacity fuel tanks, gas capacity of the permeability of material security, capacity barrier to gas in the tube and the airbag safety have much to do with driver comfort. Because of these problems, appropriate test methods, standards test, test instruments and placed in succession. The last part is a brief introduction to the evidence relating.

2. Test the impact issuance of Auto Interior Materials / Materials windshield trim

Auto interior materials / decorations, such as engineering plastics, textiles, leather and nonwoven fabrics, and various adhesives used to assemble the materials previously mentioned, which contain volatile substances that emit low heat and condenses in the window or windshield, causing poor visibility and affect driving safety. At present, relevant evidence have appeared in overseas countries on the basis of the standards of DIN 75201? ISO 6452? SAE J1756, etc. To improve the quality of the product or to expand its overseas markets, domestic auto manufactures some and automobile interior and / or manufacturers also cut attach great importance to these tests.

Indoor / car trims are tested two methods: the method and gravimetric method reflectometric. reflectometric method measures the change in opacity of the layer of fog on a surface glass plate to evaluate the property of the sample nebulization. The gravimetric method measures the amount of condensate formed on the surface of aluminum foil to get the fogging weight substances. In addition, the 'fog of value "or" weight-condensation fogging "can also obtained indicate the amount of volatilization of hazardous and noxious substances in the sample. With the value of fogging, xenon headlights Steam, users can assess the extent to which the fog inside headlight lighting affects.

At present, fogging test instruments for sale in the market Hake internships are German, Chinese and etc Labthink

3. Permeability Test Case Auto Plastic Fuel

Compared to the fuel tank Steel games, Auto Case plastic fuel is characterized by more secure property, corrosion resistance and longer life. In addition to these advantages, the fuel tank of flexible plastic in the molding and lower costs. At present, the profit rate of plastic fuel tank in the national car has been up 86?.

Despite its many advantages compared with steel fuel tank games, the weak point most obvious plastic fuel tank is its poor barrier properties, resulting in the penetration of oil penetration. To select ideal materials the plastic fuel tank, the barrier property testing of materials needed. Traditional test procedures are: fuel oil fill certain in a tank and then seal the tank. Weigh the tank and record the weight as M1. Place long enough (usually over 100 days) and reweigh it, consider weight as M2. calculated? M = M1-M2, which results in the volatilization of fuel oil. This method requires a long period and requires High Precision weighing the device is therefore with great difficulty completing the test.

ASTM D3985 provides another test method. Cut a piece of plastic tank and check the oxygen transmission rate. Comparing this result with that of several sheets of plastic to scientifically and decide quickly which the plastic has a better property.

In ASTM F1307, Test Method to test the comprehensive package is provided, with which the capacity test sealing the entire package is done.

4. Gas and Water Vapor Permeability Testing of Seat Materials

During the long and arduous journey, drivers often sit in the car for several dozen or even several hours. For this reason, the requirements for water vapor permeability and gas materials are more stringent security than other auto parts. Good mattress and seat pad is flexible with better gas and water vapor permeability so that drivers can sweat out smoothly.

GB/T10655-2003: Test procedures for gas permeability are as follows: Place the sample size specified in the chamber test and evacuate the side of the specimen so that there is a certain differential pressure formed by two sides of the sample. Then test the amount of transmission test gas through the specified area within a certain time to get the baud rate, or resistance to maintain the rate of transmission through sample and test the pressure difference on both sides of the sample to obtain the airflow. This test method according to GB/T10655-2003.

ASTM E398: Test procedures for testing water vapor permeability are: placing the sample between dry and moist chamber at constant temperature. Then the sensor within chamber test records the variation of indoor humidity and the traces of time required for the lower limit value preset to achieve the limit value superior. With continuous control and systematic analysis, the water vapor permeability and the rate of water vapor permeability can be obtained. This method agrees ASTM E398.

5. Gas Barrier Property Test Airbag security camera

1. Materials of both inner tube and the car's airbag security are required to have good barrier properties. The first ensures that inflation tube is not necessary for the long journey, while guarantees the latter than in the case of an accidental collision moments, quick review of safety air bag can ensure a degree of pressure.

In traditional testing methods, the stock or the finished tube inflates at a given pressure and the pressure gauge value is recorded. After a period time, observe the pressure drop gauge to obtain the value of the property barrier. For this method, a long period (sometimes a year) is required for test results, so it is difficult to complete those tests. Now, however, can be completed with Labthink permeability tester VAC-V2 Gas. In First, take samples of materials to test and then place the sample ac-VA. Maintain a certain pressure difference on both sides of the sample. Test gas passes through sample and pressure changes over time so that users can calculate the barrier property of materials. With this instrument, the general test, may result in 12 hours, thus greatly improving the efficiency of the test.

6. Other non-metallic materials testing cars

The materials metal used in cars are different types. In addition, there are different requirements in the same material used in different parts of cars, ie several test items are needed, such as testing of tensile strength, tear resistance, hardness, flexural strength, color, coefficient friction, etc.

Moreover, during operation of an automobile, a large number of different adhesives are needed, the property that imposes an influence vital to the quality of the car. Therefore, these non-metallic materials also require the shear test, tensile and tear strength.

7. Conclusion

nonmetallic material is light in weight, which can lighten the weight of cars to achieving energy saving purpose. The best processing technology of these materials allows automakers to design components and models of cars with more flexibility. As more and more non-metallic materials are applied to automobiles, evidence of ownership of the materials provide more effective support for safe and optimized materials.

For more information please do not hesitate to contact Shirley via trade2 # labthink.cn Wu, skype: Labthink shirley, MSN: shirleywu_labthink # hotmail.com or 0086-531-85068709 (Tel).

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