High Modulus Carbon Fiber Tube

The compression modulus of high modulus carbon fiber tube has a great relationship with resin properties and the molding process. Carbon fiber tubes are made of cut carbon fiber prepregs stacked at a certain angle. If reasonable design and laying can be carried out, carbon fiber round tubes can play a good mechanical performance advantage.

1. Since most of the carbon fibers in the M series are PAN-based materials using wet spinning, there will be grooves on the surface of the product. Among them, the single fiber diameter of M40 is about 5.2um, the surface groove is shallow, and the uniformity is poor; the single fiber diameter of M55) is 4.7um, the surface groove is deep and narrow, and the distribution is relatively uniform; the single fiber diameter of M60J is also about 4.7um, the groove is deep and narrow, and the spine of the groove (original fiber bundle) is well oriented along the fiber axis.
2. M carbon fiber is composed of crystalline and amorphous regions and belongs to a heterogeneous structure. And the size of the crystal area from M40J to M60 gradually increases; there are pores in the crystal area and the amorphous area, the porosity of M40J is 19.9%, M50 is about 15.3%, and M60) is 13.0%, which corresponds to their density. M60) has a three-dimensional ordered graphite structure, while M40J and M50J are two-dimensional ordered chaotic layer graphite structures.
3. MJ series carbon fiber has a skin-core structure like other carbon fibers. The larger the value, the more serious the skin-core structure is, and it is the same as the order of their tensile strength decrease. It can be seen that the skin-core structure is one of the main factors affecting its tensile strength

Is the elastic modulus of high modulus carbon fiber tube very high?
Take carbon fiber tubes as an example. The elastic modulus of carbon fiber tube is closely related to the raw materials (that is, the grade of carbon fiber yarn and the type of resin), and it is also related to the composition structure of carbon fiber tube.
T300 carbon fiber is a commonly used raw material for carbon fiber tubes. Its elastic modulus is 230GPa, while the elastic modulus of the better T700 carbon fiber is 240GPa. If you look at the elastic modulus of carbon fiber alone, you may not know the high or low. We can compare it with steel. The elastic modulus of cold-rolled steel is 180GPa, and T300 carbon fiber has exceeded it, not to mention carbon fiber materials above T700 grade. In addition to the T (tensile strength) category, carbon fiber materials also have M (tensile modulus) categories. The M series will perform better in terms of elastic modulus. This

The reason why high modulus carbon fiber tubes are used in battalions, boards, and other products is that in addition to high tensile strength and elastic modulus, low density, and lightweight are also very important reasons. In addition to a lower thermal expansion coefficient and certain acid and corrosion resistance, its performance is perfect and can be used in more complex environments.

1. Application in concrete bridge structures
In the cold winter, a large amount of rock salt is sprinkled on bridges and roads every year to prevent freezing. However, salt water is very corrosive to traditional reinforced concrete bridges. If composite bars are used, the corrosion problem of bridges can be greatly reduced, the maintenance cost can be reduced, and the service life of bridges can be increased.
2. Application in road construction
In road construction, concrete pavements and prestressed concrete roads that mainly use frontier reinforcement need to improve durability. Because the use of road antifreeze salt will aggravate the corrosion of steel bars. To solve the corrosion problem, the use of composite bars in roads has shown great advantages. For example, RTD Industries in the United States has applied composite bars on roads in Iowa and Wisconsin.
3. Application in structural concrete fields such as seaports, docks, coastal areas, and parking lots. Whether it is a high-rise parking lot, a ground parking lot, or an underground parking lot, there are technological antifreeze problems. The steel bars of many buildings in coastal areas have been significantly deteriorated due to the corrosion of sea salt in the sea breeze. Therefore, composite bars are needed in various situations.

4. Application in anti-corrosion buildings
Domestic wastewater and industrial wastewater are major sources of corrosion of steel bars, and other gaseous, solid, and liquid chemicals can also cause corrosion of steel bars. The corrosion resistance of composite bars is better than that of steel bars, so they can be widely used in sewage treatment plants, wastewater treatment equipment, petrochemical equipment, etc.
5. Application in underground projects. In underground projects, composite bar grids are usually used for reinforcement.
6. Application in components in low-conductivity and non-magnetic fields.

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