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China's speed "depends on safety"

Word:[Big][Middle][Small] QR Code 2018/4/12     Viewed:    

In recent years, China's high speed rail, which has been designed and developed by our country and has its own intellectual property rights, has been appearing frequently and constantly refreshes the international community's cognition of China's high speed rail. At present, there are more than 2395 EMUs in China's railways, ranking the first in the world, with a safe mileage of more than 3 billion 740 million km. Through the digestion and absorption of the imported technology and the bold innovation according to the actual situation, the Chinese high speed rail has shown the advantages of comprehensive system technology, low cost and rapid construction in just a few years. It shows the charm and strength of "China made" with "China speed".
Carbon fiber drives China's speed
Most of the people in the industry know that the high performance material of carbon fiber has played an important role in the "speed of China", and its significance to the high speed rail is mainly shown in the following two aspects.
One is to realize the light weight of the high - speed iron body. Carbon fiber is light weight, with a density of only 1.78 grams per cubic centimeter, similar to plastic, but its strength is more than 7 times higher than that of steel. A large amount of carbon fiber components can be used to reduce the proportion of the traditional steel structure in the high iron body. The ultra light weight of the high speed iron is beneficial to reduce the resistance, reduce the energy consumption directly, reduce the emission of carbon dioxide, and finally improve the speed.
The two is to increase the safety of the high speed rail operation. The faster the speed of the high speed rail, the higher the requirements for the durability of the body parts. For example, at the end of 2010, the "harmony" CRH380A ran out of 486.1 km at the speed of combined test and comprehensive test on the line between Zaozhuang and Bengbu in the leading section of the Beijing Shanghai high speed railway, but this high speed has a great impact on the bearing of the train. After the most high-speed impact, all bearings on the train almost need to be replaced again. Although the country has the speed of reducing the speed of the high speed rail, the average speed of the high speed rail is more than 200 kilometers, which requires the material with strong tolerance to ensure the safety of the high speed rail. The strength of carbon fiber material is up to 3600MPa, especially the steering wheel made of carbon fiber. The mechanical strength and impact resistance are increased by 35% and more than 20%, respectively. The strength of the vehicle is also at least 20%~30% higher than that of the ordinary material, and it is not afraid of corrosion of acid, alkali and salt.
In addition, the high speed rail needs to cross the larger region of the temperature difference in a short time, from the ice and snow Harbin to the spring of Guangzhou, the short time experience greater temperature difference needs to maintain the zero deformation of the parts, which is a huge challenge for ordinary materials, but it is a strong term for carbon fiber.
At present, carbon fiber composites can be used not only in train interior, pantograph and equipment cabin, but also for the main bearing parts such as car body and bogie.
In the high speed iron manufacturing of carbon fiber showed a clear demand situation, a lot of carbon fiber manufacturing enterprises also timely aimed at the high speed rail market, the initiative docking industry. At present, China's high speed rail construction is in a period of prosperity. Through years of efforts and accumulation, China has fully grasps the core technology of high speed railway, and the overall level of the industry has become the advanced ranks of the world. On the crisscross track, the speed of China's high-speed rail represents "made in China" and has been on the road of independent intellectual property development. In this process, the use of new carbon fiber materials not only promotes the light quantization of high speed trains, but will also bring about new changes in the high speed rail manufacturing industry and further improve the "speed of China".
Speed is more secure
However, at the same time, the security can not be ignored. Rail transportation, such as high speed rail, plays an increasingly important role in social life, and their safety is directly related to the vital interests of the masses. Then, what are the key safety problems of carbon fiber composites in the field of rail transit vehicles?
First of all, if carbon fiber is to be applied to high-speed rail vehicles, safety is a topic that can not be avoided in addition to meeting the requirements of strength, stiffness and weight reduction.
The core of safety is fire prevention. The high-speed rail car is a closed space. If there is a fire, passengers can not avoid it. If fire retardancy is too bad, safety accidents are a great probability. After all, no one wants to travel on flammable and explosive products.
Fire protection requirements
Carbon fiber composites are applied in the field of rail transportation, and fire prevention is the key point. The so-called fire prevention involves four aspects: flame retardancy, smoke density, droplet and smoke toxicity.
Flame retardancy
First of all, flame retardancy means that the material has the nature of postponing flame spreading. That is to say, the flame can burn to the composite components and can not continue to spread forward. Flame retardancy is usually judged by the length of combustion failure or the time of combustion extinction.
For example, the German railway vehicle fire safety standard D5510-2 is divided into S2~S5 (S2/S3/S4/S5) four grades.
DIN5510-2 S2 level requirement: the burn damage length of the product is not more than 30cm.
DIN5510-2 S3 level requirements: the length of the product combustion and destruction does not exceed 25cm and the post combustion time does not exceed 100s.
DIN5510-2 S4 level requirements: the length of the product combustion and destruction does not exceed 20cm and the post combustion time does not exceed 10s.
DIN5510-2 S5 level requirements: the product has no combustion and no combustion time.
Smoke density
Next is the density of smoke, that is, the amount of smoke that the flame spreads to the composite parts. Generally speaking, the less the smoke, the less harmful to the human body. Test smoke

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