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How About The Hardness Performance Of Carbon Fiber Tube?

How About The Hardness Performance Of Carbon Fiber Tube

There are many production processes for carbon fiber tubes, such as winding, rolling, molding, autoclave and other forming methods. The price and performance of carbon fiber tubes under different processes will be different, mainly related to the actual use requirements and tube size specifications. ,

For the carbon fiber tubes produced by carbon fiber product manufacturers, most of them are completed by laminating carbon fiber prepregs, because this reduces the prepreg process in the early stage and greatly improves the production efficiency.

No matter which carbon fiber tube production process is used, the strength of the carbon fiber tube is higher than that of the metal tube, and the hardness is also very high. For the specific performance, just follow the editor of the Be-cu prototype to see.

Carbon fiber pipe is a black, textured, high-strength pipe. Many people may mistakenly think that it is a plastic pipe with higher hardness, but it is not. The hardness and strength of carbon fiber tubes are not the same properties. The advantage of carbon fiber tubes is high strength, not hardness. The hardness of carbon fiber tubes is actually not high, and there are some other shortcomings, but its advantages are so obvious that the term “flaws do not hide the advantages” is very suitable for carbon fiber tubes.

Are Carbon Fiber Tubes Hard?

The hardness of carbon fiber pipes is not high, and may not be much higher than ordinary plastic pipes, but its advantage does not lie in this. Its mechanical properties are reflected in ultra-high tensile strength and elastic modulus. The tensile strength of T300 carbon fiber pipes can reach 3500MPa. Even if it is made into a carbon fiber pipe, the strength can also exceed 2000MPa, which is 4-5 times that of ordinary steel pipes.

The higher load-bearing capacity brought by tensile strength can produce equally high stresses internally when withstanding high external pressure, allowing carbon fiber tubes to be used in more demanding environments, such as in space.

The advantage of carbon fiber tubes is that its density is very low, only 1.7g/cm3, which is higher than ordinary plastic tubes and much lighter than metal tubes. Carbon fiber tubes can achieve a load-bearing capacity several times higher than that of metal tubes under polar self-weight, which is a rare material property in the aerospace field.

In addition, the fatigue resistance of carbon fiber pipes is also excellent, accounting for 70-80% of its own tensile strength. You must know that the fatigue resistance of steel pipes is only about 40% of its own strength. In comparison, this attribute can widen the gap even further. This is also One of the reasons why carbon fiber tubes are so popular.

The Other Disadvantages Of Carbon Fiber Tubes

Carbon fiber tubes have excellent mechanical properties, but they also have some defects, which mostly come from the material itself and the design and CNC Machining process.

  • The resin system is heat-resistant and its aging resistance needs to be verified. Currently, thermosetting carbon fiber boards use epoxy resin, which has low high-temperature resistance. The overall high-temperature resistance of carbon fiber boards has declined. The thermoplastic carbon fiber boards being developed can solve this problem.
  • Poor puncture resistance: Carbon fiber boards are made of carbon fiber prepreg layers. Carbon fiber prepreg is an intermediate material formed by carbon fiber tows according to a certain arrangement and combination, and is not resistant to puncture.
  • The layered structure is prone to delamination: The level of layering experience will affect the effect of the layering. Layering indicates that there are gaps in the space, which directly affects the overall performance of the carbon fiber board.

For now, carbon fiber is not a perfect material. So far, there is no material with excellent performance in all aspects. Avoiding the shortcomings of carbon fiber materials and using them rationally can exert great value. This is exactly what the aerospace field is doing.

There are still many types of carbon fiber tubes. Like our common metal tubes, there are also many types of distinctions, such as round tubes, square tubes, rectangular tubes, special-shaped tubes, etc. When it comes to hardness performance, as far as the general carbon fiber tube is concerned.

Hardness actually refers to specific strength. We usually refer to tensile strength. The strength refers to the deformation of the carbon fiber tube under pressure and the performance of fatigue resistance under the pressure of external force, which is similar to the specific strength. Strength means the bending resistance of the material divided by its density, which is the strength shown. This is why the carbon fiber tube outlaws the metal tube and plays a light weight. The hardness and strength of the carbon fiber tube are very high. This hardness can reach 10 times the hardness of steel. This is also an important reason why carbon fiber tubes are so popular.

The carbon fiber tube has high hardness, but in practical applications, it should be noted that the carbon fiber material is relatively brittle, especially if a sharp point force can easily cause the carbon fiber tube to rupture. Then pay attention at this time.

The hardness performance of carbon fiber tubes is very good, which also makes carbon fiber tubes very well used in many industries, such as aircraft wings, which need to have extremely high strength properties, such as mechanical arms and rollers on mechanical equipment. Other carbon fiber tube products have higher requirements for hardness. Including carbon fiber tube can be used as a very good load-bearing product. Carbon fiber tube is popular because of its high performance. If you need it, welcome to consult the editor of Be-cu prototype.


ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.