Carbon fiber composites consist of carbon fiber and resin, of which carbon fiber plays a role of reinforcement, whereas resin matrix distributes the load uniformly and transmits the load to the carbon fiber through the interface. Unlike homogenous and continuous metals, the cutting process of carbon fiber composites is more complicated. This article talks about the cutting mechanism for different directions of carbon fiber composites.

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(1) When θ = 0 °, the chip is formed by the cutter continuously peeling off the fiber layer and the resin layer during the feeding process, and we call this type of cutting deformation into an interlayer separation type. As the tool is fed, the material being cut is pressed and the tensile strength of the resin layer is far less than the compressive strength of the carbon fiber layer. When the squeeze state is large, peeling occurs in the lowermost layer of the cutting portion , Cutting layer was set off. When the cutting tool continues to feed, the cutting layer is subjected to bending stress. As the bending stress increases and exceeds the strength limit of CFRP, the fiber layer breaks to form chips.

(2) When 0 ° <θ <90 ° (represented by θ = 45 ° and θ = 90 °). The squeezing action of the tool during feeding forms a shear stress perpendicular to the fiber inside the material. As the shear stress increases and exceeds the strength limit of the CFRP, the fiber is sheared and the fiber is then pushed in by the cutter Continue to move forward and produce slippage. During the slip process, shear stress will be generated at the fiber interface. When the shear stress increases and exceeds the shear strength limit of the resin layer, the carbon fiber layer separates to generate chips. Such cutting deformation known as fiber-cut type.

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(3) When 90 ° <θ <180 ° (represented by 135 °). When the cutting tool squeezes the fiber material during feeding and causes the material layer to peel off, the fiber material bends at the tool tip. When the bending stress increases and exceeds the flexural strength limit of CFRP, the bottom of the material breaks and the breaking point is concentrated in the stress concentration The maximum bending stress at the fracture point is generally below the blade edge. The cutter continues to feed and squeeze the front end material. When the bending stress generated by the extrusion is greater than the bending strength limit at the fracture point at the bottom of the material, the material is cut to produce chips. Such cutting deformation is called bending shear type.

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