When recognizing carbon fiber reinforced plastic composite products, many people first feel cool when they see products with carbon fiber textures, with a sense of fashion and technology. Today we will discuss the difference between different carbon fiber textures to make carbon fiber composite products.
Carbon fiber plays a role in bearing load in composite materials, and the external force acting on CFRP composite material will be transmitted to carbon fiber through plastic, so the damage to CFRP composite material must first destroy carbon fiber.
Then the damage to the carbon fiber can be basically divided into two types, one is the tensile force parallel to the direction of the carbon fiber, this force will break the carbon fiber, so the carbon fiber is required to have high tensile strength; the other is the shear force, This force is perpendicular to the direction of carbon fiber, which requires carbon fiber to have high shear strength. Unfortunately, there is no statement of carbon fiber shear strength in the performance parameters of all carbon fiber suppliers. This is because first of all, the shear strength of carbon fiber is very small. On the other hand, carbon fiber itself is a one-dimensional material, which is small in diameter. Any shear force on carbon fiber products can be decomposed into tensile forces of carbon fibers in different directions.
With this concept, in the process of designing composite products, we should understand the force of the product as much as possible, and then optimize the fiber arrangement direction of the product, so as to decompose the external force acting on the carbon fiber composite into different components as much as possible. The tensile force of carbon fiber in the direction, because high tensile strength is the biggest advantage of carbon fiber, it is better to use one’s own strength to attack the other’s shortcomings. Two-dimensional woven cloth is the raw material for manufacturing carbon fiber composite products and prepregs, and it is also the basis for optimizing the direction of fiber arrangement. Then the understanding of different carbon fiber cloth weaving directions will help the design of carbon fiber composite products.
1.Plain Weave Cloth
Plain weave is characterized by the interweaving of warp and weft in a one-upper-down pattern. That is to say, the warp and weft yarns are interlaced every other yarn, so the interlacing points are the most, making the fabric firm, wear-resistant, stiff and smooth, but the elasticity is small and the luster is average. Good abrasiveness, good air permeability, uniform cloth surface and the same front and back. Because the fiber bundle of this carbon fiber cloth is always in a state of ups and downs, the fiber has many bending points, and the elongation rate is high during the stretching process. At the same time, the position of the interlacing point of two adjacent warp yarns and two adjacent weft yarns appears due to the sliding of fiber bundles. There are also many variants of plain weave, such as 12K warp and 1K weft mixed weaving. Due to the difference in reflected light from the fiber bundles in the warp and weft directions, the plain weave fabric has a lattice-like appearance, similar to a chess piece .Plain weave cloth carbon fiber fobric is widely used in life,for example, industrial and fire protection, etc.
2 Twill Weave
The twill weave fiber cloth has a diagonal pattern that has a certain angle with the arrangement direction of the fiber bundle. There is no fiber bundle in the direction of the pattern, but due to the warp and weft weaving process of the fiber bundle, the warp or weft fiber bundle skips two lines. Bundles of weft or warp fibers are woven. That is, the weaving frequency of the fiber bundles up and down decreases, the floating length of the fiber bundle increases, and at the same time, two adjacent fiber bundles are staggered by one braiding position. This results in the diagonal grain characteristics of the twill woven fabric. This twill appearance has a strong three-dimensional effect ,twill weave cloth carbon fiber fobric is widely used in life, is used for car modification products, such as panels, hoods, exhaust pipes, etc.
3.Satin Weave
Satin weave has separate, discontinuous warp interlacing points (or weft interlacing points) regularly and evenly distributed in the weave cycle, such a weaving form is called satin weave. It is characterized by long warp (or weft) floating lines and fewer interlacing points. Although they form oblique lines, they are not continuous, and the distance from each other is regular and uniform. This fiber cloth structure is called satin weave. The satin fiber cloth warp and weft yarns are interlaced at least every three times, so this weave structure makes the fabric denser and the fiber cloth thicker. This satin fiber cloth has a smooth, even surface and is soft, shiny or slightly textured. The strength of this type of fiber cloth is lower than that of plain weave and twill weave.
These three weaving forms have differences in the strength of carbon fiber cloth due to the influence of carbon fiber bundles by bending and other fiber bundles, and the strength of carbon fiber woven cloth will be characterized by tensile force, tear force, burst force, bending force, etc. There are differences in the way of weaving. In general, the tensile strength in the direction of carbon fiber bundle arrangement is related to fiber strength and fiber friction. The tensile force in the direction different from that of the fiber bundle has a greater relationship with the weaving shape of the fiber. On the one hand, this tensile force can be divided into the force in the parallel direction of the fiber and the force in the vertical direction. The force in the parallel direction requires the strength of the fiber. high, the force in the vertical direction is related to the resistance of the weave pattern to the fiber bundle.
