Carbon fiber is produced by thermally processing organic fibers through a series of steps, and its carbon content is higher than... 90% Inorganic high-performance fibers are a new type of material with outstanding mechanical properties. They possess the inherent characteristics of carbon materials while also inheriting the softness and processability of textile fibers, making them a next-generation reinforcing fiber. Carbon fibers exhibit the typical properties of carbon materials, such as high-temperature resistance, wear resistance, electrical conductivity, thermal conductivity, and corrosion resistance. However, unlike conventional carbon materials, carbon fibers have pronounced anisotropy in their structure, are flexible, and can be processed into various types of fabrics. Along the fiber axis, they demonstrate exceptionally high strength. Moreover, carbon fibers have a low density, giving them a remarkably high specific strength.

Carbon fiber is a new material with excellent mechanical properties; its specific gravity is less than that of steel. 1/4 The tensile strength of carbon fiber resin composites generally ranges from... 3500Mpa The above is steel. 7~9 times, the tensile elastic modulus is 23,000–43,000 MPa It is also higher than steel. Therefore, Carbon fiber reinforced polymer The specific strength—the ratio of a material's strength to its density—can reach 2000 MPa/(g/cm³) The above, and A3 The specific strength of steel is only 59 MPa/(g/cm³) Moreover, its specific modulus is also higher than that of steel.

Carbon fiber 50 It emerged at the beginning of the era in response to the demands of cutting-edge scientific and technological fields such as rockets, astronautics, and aviation. The advantages of carbon fiber composites lie in their high strength—(they are stronger than steel) 5 Twice as much), excellent heat resistance ( Can be tolerated 2000 High temperatures above ℃ ) Excellent thermal shock resistance and low coefficient of thermal expansion. ( Small deformation. ) · Small thermal capacity (energy-saving), low specific gravity (compared to steel) 1/5 ) Excellent corrosion and radiation resistance.

The traditional materials used for railway vehicle bodies mainly include aluminum alloy, stainless steel, and carbon steel. Aluminum-alloy bodies suffer from issues such as stress corrosion, difficulties in surface treatment, high welding requirements, and low fatigue strength. Stainless-steel bodies face challenges including poor sealing performance, local buckling, and significant welding-induced deformation. Carbon-steel bodies are prone to corrosion, hinder lightweight design, and exhibit substantial welding-induced distortion. Carbon fiber-reinforced composites have attracted widespread attention due to their outstanding properties; among these, carbon-fiber-reinforced resin-based composites... ( Carbon fiber composite material ) It is currently one of the most favored options.

The subway’s carbon-fiber composite bogie frame utilizes advanced automated molding technology, and the side beams are made from woven preforms. +RTM Process: The crossbeam is made using a dry-winding preformed body. +RTM The process features a high degree of automation, ensures stable product quality, and reduces weight compared to traditional carbon steel frames. 44.4% According to testing conducted by a third-party laboratory, the vehicle exhibits excellent static and fatigue performance. The carbon-fiber subway car before us was designed by CRRC Qingdao Sifang Locomotive & Rolling Stock Co., Ltd., and the entire train operation process is fully automated. According to publicly available information, the vehicle is equipped with a powerful intelligent monitoring and early-warning system that continuously senses the train’s status in real time, enabling proactive fault detection and warning during operation. This train also features reduced cabin noise. 5 With features such as being able to flexibly form trainsets based on changes in passenger flow, carbon fiber composite materials are used instead of traditional metal materials in the manufacture of subway cars, resulting in a reduction in the overall vehicle mass. 40% The train employs advanced carbon-fiber technology; the car body, bogie frame, driver’s cab, equipment compartment, and other components are all made from carbon-fiber composite materials, significantly reducing the overall weight of the vehicle. 13% Meanwhile, the traction system features a new, highly efficient and energy-saving silicon carbide inverter and a permanent-magnet synchronous traction motor, making the vehicle lighter and the traction system more efficient, thus saving energy during operation. 15% The above-mentioned performance indicators all fully meet the design requirements, and significant improvements have been achieved in terms of noise, vehicle body vibration, and deformation.

Metro construction involves massive investment, and its subsequent operation and maintenance costs are also considerable. Adopting carbon fiber composites on a large scale will effectively reduce the subway’s own weight, thereby minimizing unnecessary energy consumption and rail wear. The high performance-to-weight ratio of carbon fiber extends the service life of trains and lowers their later-stage maintenance costs.

According to data from the Ministry of Transport, as of... 2020 By the end of the year, the operating mileage of urban rail transit in China. 7545.5 kilometers—if all urban subways were replaced with carbon-fiber subways, based on savings— 15% In terms of energy consumption calculations, the savings will be a remarkably substantial figure.

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