What are the advantages of carbon fiber tubes?

1. Density: Like other materials, the density of carbon fiber tubes is mainly affected by the constituent substances, so the density of carbon fiber tubes is mainly determined by the density of carbon fibers. The density of general carbon fiber tube is about 1.7g/cm3, while the density of general steel tube is 7.8g/cm3. The density ratio of the two is 1:4, and the weight ratio of carbon fiber tube and steel tube of the same strength is 1:43. Under the premise of the same strength, the density and weight of carbon fiber pipes are much smaller than those of steel pipes.

2. Bending shear strength and modulus: The analysis of bending shear modulus of carbon fiber tube is complicated, because when the carbon fiber tube itself is subjected to lateral bending, the tube wall is subjected to shear stress in the vertical direction, and this shear stress can be decomposed into two shear stresses. After testing, the theoretical bending shear modulus is 8.63GPa, and the actual measurement is 8.46GPa, which is relatively consistent.

When the carbon fiber tube is bent and sheared, the shear stress is very complex, not only the tangential shear stress along the tube wall, but also the interlaminar shear stress perpendicular to the tube wall. Theoretically, the shear strength of this carbon fiber tube is 112MPa, and the actual measured value is 103MPa, which is also very close to the theoretical value.

3. Tensile strength and modulus: Tensile modulus can test the maximum tensile force that the fiber can withstand. Its unit is psi, which means how many pounds of tensile force can be supported per square inch. Carbon fibers with a tensile mode star below 34.8 million psi will be classified as low mode star carbon fibers. Others include standard modulus, intermediate modulus, high modulus and ultra-high modulus. The tensile modulus of elasticity of ultra-high modulus carbon fiber is 72.5 million-145 million psi (500-100 million kPa). Compare that to steel with a tensile modulus of about 29 million psi (200 million kPa). The elastic modulus of carbon fiber is about 10 times stronger than that of steel, and in terms of weight, the weight of steel is five times that of carbon fiber. In addition, the fatigue resistance of carbon fiber is very superior compared to other metals. If it is fused with resin, it will become one of the corrosion-resistant materials.

4. Other advantages: In addition to the outstanding advantages of light weight and high strength, the biggest difference between carbon fiber and metal materials is that carbon fiber is a non-metallic material with low electrochemical activity, excellent corrosion resistance and anti-aging properties, which can prolong the life of carbon fiber tubes. service life. The carbon fiber material has high working temperature, is safe to use, and has a small thermal expansion coefficient, which basically does not deform with the change of working temperature, ensuring dimensional stability.

Founded in 2006, Jiaxing Longshine Carbon Fiber Products Co., Ltd. is China Custom Carbon Fiber Tubes Manufacturers and OEM Carbon Fiber Pipes Factory, located in the center of Yangtze River Delta, the state-level Xiuzhou High-tech Industrial Development Zone of Jiaxing. In recent years, we committed to the r&d and production of carbon fiber and other composite materials in the military and civil fields, including participating in the R&D and production of C919 aircraft parts, high-speed rail accessories, and several logistics support projects.