Carbon fiber reinforcement, as the name suggests, is a new type of structural material made from the "king of new materials" carbon fiber, which is combined with resin through a special pultrusion process. The density of this carbon fiber composite material is only 1/7 to 1/5 of that of steel, but its own strength is more than 10 to 15 times that of steel bars.
This carbon fiber bar, which looks like steel bars but outperforms them, is widely used in civil engineering, marine engineering, bridge engineering and other fields due to its advantages of light weight, corrosion resistance and fatigue resistance. It can lift a bridge or reinforce a city wall; it is suitable for plateau areas and marine environments... How do carbon fiber bars have such "superpowers"?
How to make carbon fiber reinforcement?
Carbon fiber ribs are rod-shaped carbon fiber reinforced composite materials that are formed by using continuous carbon fibers as reinforcement materials and a resin matrix using an appropriate molding process.
Among them, carbon fiber is the main load-bearing part, and the tensile strength and tensile modulus of carbon fiber have a decisive influence on the strength and deflection of carbon ribs. The role of the resin matrix is to bond the carbon fiber multifilaments into bundles to bear the force together, which plays a certain role in the longitudinal tensile and compression properties of the ribs and determines the moisture and heat resistance of the product.
What are the characteristics of carbon fiber reinforcement?
Carbon fiber reinforcement has the advantages of high strength, light weight, corrosion resistance, and fatigue resistance. The maximum tensile strength is over 3000 MPa, and the relative density is only 1/5 of that of steel bars. The fatigue resistance is significantly better than that of steel bars. It has excellent resistance to chemical corrosion in harsh environments such as acid, alkali, salt and moisture. The vibration attenuation characteristics of fiber reinforcement are better than those of steel, and the energy absorption and shock reduction effects are better.
From carbon fiber to carbon fiber reinforcement
Carbon fiber tendons are generally formed by pultrusion. Pultrusion refers to the manufacturing process of producing continuous lengths of fiber-reinforced polymers with a constant cross-section. The process is to lead the carbon fiber from the creel, collect the fibers into bundles according to the shape of the die by the yarn guide plate, and guide them into the resin bath of the glue tank.
The carbon fiber passes through the glue tank regularly. The resin in the glue tank fully infiltrates the reinforcing fiber, and the resin infiltrated on the fiber surface is squeezed evenly through the internal components of the glue tank, and then enters the forming mold. The excess resin is squeezed out at the pre-forming mold and then enters the heated forming mold. In the heated mold, the resin gradually heats up and solidifies, and forms a round rod with the same diameter according to the shape of the mold. The mold is generally equipped with a heated post-curing box to improve the curing degree and comprehensive performance of the carbon fiber ribs.
The cured carbon fiber reinforcement is drawn out by a pulling device and cut into required length or wound into a disk.
