Anti-impact sheath for carbon fiber composite cable

Abstract

The invention belongs to the technical field of engineering materials, and particularly discloses an anti-impact sheath for a carbon fiber composite cable. The sheath comprises an outer protective layer and an inner protective layer; the inner protective layer has a porous structure; the inner protective layer is made of at least one of polyurethane resin, silicone rubber, polylactic resin, fiber reinforced polyurethane resin and fiber reinforced silicone rubber; the porous structure has at least one pore structure selected from a regular pore structure, a disordered pore structure, a bionic pore structure and a gradient pore structure. The sheath has the advantages of being large in compression deformation, high in energy absorption capacity, good in impact resistance and protection effect, light in weight, high in designability and the like, when the sheath is applied to the carbon fiber composite cable, the transverse impact resistance of the carbon fiber composite cable can be remarkably improved, and the service life of the carbon fiber composite cable is prolonged. And the dead weight of the carbon fiber composite cable is reduced, and the bearing efficiency of the cable is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering materials, and in particular relates to an impact-proof sheath for a carbon fiber composite material cable. Background Art

[0002] Carbon fiber composite cables are primarily tensile load-bearing components composed of a carbon fiber composite core, a protective sheath, and an anchoring system. Due to their high strength, corrosion resistance, and lightweight, carbon fiber composite cables are particularly suitable as a replacement for steel cables in long-span bridges or those used in corrosive environments. Typical applications for carbon fiber composite cables include stay cables for kilometer-long cable-stayed bridges, sling cables for suspension bridges, and mooring cables for floating offshore wind turbine platforms or offshore fisheries.

[0003] As an emerging structural component, carbon fiber composite cables have yet to see widespread adoption. Therefore, some aspects of their construction and manufacturing have simply inherited the corresponding technologies of steel cables, such as protective sheaths. Currently, the protective sheaths used on carbon fiber composite cables are essentially the same as those used on steel cables: a double-layer polyethylene sheath. This simplistic imitation is illogical. The primary purpose of steel cable protection is corrosion protection. Due to the rust-prone nature of steel, bridge cables and mooring cables operating in river, lake, and marine environments are susceptible to corrosion due to the combined effects of humidity, temperature, salinity, and stress. Therefore, steel cable protective sheaths are typically constructed of dense, thick, high-density polyethylene. However, the primary purpose of carbon fiber composite cable protection is not corrosion protection, but impact protection, while also requiring lightweighting. Rust resistance is an inherent property of carbon fiber composites, so corrosion protection is not necessary during use. However, the unidirectional fiber composite rods or strands used in carbon fiber composite cables have poor transverse impact resistance. Even a slight impact or cut can have catastrophic consequences, necessitating special protection against impact. The inventors' experiments also demonstrate that it's unscientific to extend the sheathing of steel cables, primarily for corrosion protection, to carbon fiber composite cables, which also require impact resistance. This is primarily due to the high stiffness and hardness of the double-layer high-density polyethylene sheath, which results in low impact compression deformation and weak energy absorption. The vast majority of external impact energy reaches the core, damaging the carbon fiber composite rods or strands.

[0004] In addition, the double-layer polyethylene protective sheath used in the carbon fiber composite cable in the existing technology is heavy, even exceeding the weight of the carbon fiber composite rod / strand, resulting in the weight of the protective sheath and other accessories accounting for too high a proportion of the load borne by the cable, and failing to fully utilize the lightweight and high-strength characteristics of the carbon fiber composite cable. Summary of the Invention

[0005] In order to overcome at least one technical problem existing in the above-mentioned prior art, one of the objectives of the present invention is to provide a sheath for a carbon fiber composite cable.

[0006] A second object of the present invention is to provide a carbon fiber composite cable.

[0007] A third object of the present invention is to provide the above-mentioned sheath for carbon fiber composite cable and / or the application of the above-mentioned carbon fiber composite cable in bridges or offshore equipment.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A first aspect of the present invention provides a sheath for a carbon fiber composite cable, the sheath comprising an outer protective layer and an inner protective layer; the inner protective layer having a porous structure;

[0010] The material of the outer protective layer includes at least one of high-density polyethylene, epoxy resin, fiber-reinforced high-density polyethylene, and fiber-reinforced epoxy resin;

[0011] The material of the inner protective layer includes at least one of polyurethane resin, silicone rubber, polylactic acid resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber.

[0012] In the present invention, the inner protective layer has a porous structure. On the one hand, its internal pore structure can undergo significant collapse and deformation under impact, resulting in a large compression deformation and strong energy absorption capacity, thereby effectively absorbing impact. On the other hand, due to its high porosity, it can be lightweight compared to solid structures, making it suitable for use as a protective sheath for carbon fiber composite cables. The outer protective layer has a certain degree of rigidity. The present invention uses a solid outer protective layer and a porous inner protective layer to synergistically improve the mechanical strength of the sheath, enhance its impact resistance, and reduce its weight, achieving the requirements of lightweight and high strength.

[0013] In some embodiments of the present invention, the fibers in the fiber-reinforced high-density polyethylene, fiber-reinforced epoxy resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber are independently selected from at least one of chopped fibers and continuous long fibers.

[0014] In some embodiments of the present invention, the fibers in the fiber-reinforced high-density polyethylene, fiber-reinforced epoxy resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber are independently selected from at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and polypropylene fiber.

[0015] In some embodiments of the present invention, the porous structure has at least one pore structure selected from a regular pore structure, a disordered pore structure, a bionic pore structure, and a gradient pore structure.

[0016] In some embodiments of the present invention, the porous structure contains pores; the structure of the pores includes at least one of hexagons, triangles, squares, circles, convex hexagons, concave hexagons, double V-shapes, tetradecahedrons, helical curved tetrahedrons, and stars.

[0017] In some embodiments of the present invention, the porous structure is a honeycomb structure.

[0018] In some embodiments of the present invention, the thickness of the outer protective layer is 1 to 10 mm; in some specific embodiments of the present invention, the thickness of the outer protective layer is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, or any range formed by any two of the values.

[0019] In some embodiments of the present invention, the thickness of the inner protective layer is 1 to 10 mm; in some specific embodiments of the present invention, the thickness of the inner protective layer is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, or any two of the values ​​in the range.

[0020] In some embodiments of the present invention, the cross-sectional shape of the hollow core of the inner protective layer is a regular hexagon with rounded corners.

[0021] In some embodiments of the present invention, the outer protective layer is in the shape of a hollow cylinder.

[0022] In some embodiments of the present invention, the outer protective layer has a stiffness greater than that of the inner protective layer.

[0023] In some embodiments of the present invention, the porosity of the outer protective layer is smaller than that of the inner protective layer.

[0024] In some embodiments of the present invention, the Poisson's ratio of the inner protective layer is less than 0.

[0025] A second aspect of the present invention provides a carbon fiber composite cable, comprising a carbon fiber composite core and the sheath for a carbon fiber composite cable according to the first aspect of the present invention; the sheath is arranged outside the carbon fiber composite core.

[0026] In some embodiments of the present invention, the carbon fiber composite material core includes a carbon fiber composite material rod and a wrapping tape wrapped around the outer surface of the carbon fiber composite material rod.

[0027] The third aspect of the present invention provides use of the sheath for the carbon fiber composite cable according to the first aspect of the present invention and / or the carbon fiber composite cable according to the second aspect of the present invention in a bridge or offshore equipment.

[0028] The beneficial effects of the present invention are: the sheath in the present invention has a large compression deformation, strong energy absorption capacity, good impact protection effect, and also has the characteristics of light weight and strong designability. When applied to carbon fiber composite cables, it can significantly improve the lateral impact resistance of carbon fiber composite cables, reduce the dead weight of carbon fiber composite cables, and improve the load-bearing efficiency of the cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of a double-layer anti-impact sheath in an embodiment of the present invention.

[0030] Figure 2 Schematic diagram of the cross-sectional structure of the double-layer anti-impact sheath in Example 1 of the present invention.

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of the double-layer impact-resistant sheath in Example 2 of the present invention.

[0032] Figure 4 This is a schematic diagram of the cross-sectional structure of the double-layer anti-impact sheath in Example 3 of the present invention.

[0033] Figure 5 1 is a graph showing the relationship between uniaxial compression pressure and compression deformation of a polylactic acid resin cube using helical curved tetrahedron cells and a solid high-density polyethylene cube in an embodiment of the present invention.

[0034] Reference numerals:

[0035] Outer protective layer 1, inner protective layer 2, carbon fiber composite rod 3, polyester fiber wrapping tape 4, convex hexagonal honeycomb cell 5, concave hexagonal honeycomb cell 6, spiral curved surface icosahedron cell 7. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that if there are any processes that are not particularly described in detail below, they can be implemented or understood by those skilled in the art with reference to the prior art. The reagents or instruments used that do not indicate the manufacturer are all conventional products that can be purchased commercially.

[0037] In some embodiments of the present invention, the present invention provides a sheath for a carbon fiber composite cable, the sheath comprising an outer protective layer and an inner protective layer; the inner protective layer has a porous structure;

[0038] The material of the outer protective layer includes at least one of high-density polyethylene, epoxy resin, fiber-reinforced high-density polyethylene, and fiber-reinforced epoxy resin;

[0039] The material of the inner protective layer includes at least one of polyurethane resin, silicone rubber, polylactic acid resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber.

[0040] In the present invention, the inner protective layer has a porous structure. On the one hand, the pore structure inside it can undergo a large collapse deformation under impact, with a large compression deformation and strong energy absorption capacity, thereby effectively absorbing the impact. On the other hand, due to the high porosity, the porous structure is lighter than the solid structure, so it can be lightweight and suitable for use as a protective sheath for carbon fiber composite cables. The outer protective layer has a certain degree of rigidity and corrosion resistance. The present invention uses a solid outer protective layer and an inner protective layer with a porous structure to work together, which can improve the mechanical strength of the sheath, improve the impact resistance of the sheath, and reduce the weight of the sheath, achieving the requirements of lightweight and high strength.

[0041] In some embodiments of the present invention, the fibers in the fiber-reinforced high-density polyethylene, fiber-reinforced epoxy resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber are independently selected from at least one of chopped fibers and continuous long fibers.

[0042] In some embodiments of the present invention, the fibers in the fiber-reinforced high-density polyethylene, fiber-reinforced epoxy resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber are independently selected from at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and polypropylene fiber.

[0043] In some embodiments of the present invention, the porous structure has at least one pore structure selected from a regular pore structure, a disordered pore structure, a bionic pore structure, and a gradient pore structure.

[0044] In some embodiments of the present invention, the porous structure contains pores; the structure of the pores includes at least one of hexagons, triangles, squares, circles, convex hexagons, concave hexagons, double V-shapes, tetradecahedrons, helical curved tetrahedrons, and stars.

[0045] In some embodiments of the present invention, the porous structure is a honeycomb structure.

[0046] In some embodiments of the present invention, the thickness of the outer protective layer is 1 to 10 mm; in some specific embodiments of the present invention, the thickness of the outer protective layer is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, or any range formed by any two of the values.

[0047] In some embodiments of the present invention, the thickness of the inner protective layer is 1 to 10 mm. In some specific embodiments of the present invention, the thickness of the inner protective layer is any one of 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, and 10 mm, or a range formed by any two of the values.

[0048] In some embodiments of the present invention, the cross-sectional shape of the hollow core of the inner protective layer is a regular hexagon with rounded corners.

[0049] In some embodiments of the present invention, the outer protective layer is in the shape of a hollow cylinder.

[0050] In some embodiments of the present invention, the outer protective layer has a stiffness greater than that of the inner protective layer.

[0051] In some embodiments of the present invention, the porosity of the outer protective layer is smaller than that of the inner protective layer.

[0052] In some embodiments of the present invention, the Poisson's ratio of the inner protective layer is less than 0.

[0053] In some embodiments of the present invention, the present invention further provides a carbon fiber composite cable, comprising a carbon fiber composite core and the above-mentioned sheath for carbon fiber composite cable; the sheath is arranged outside the carbon fiber composite core.

[0054] In some embodiments of the present invention, the carbon fiber composite material core includes a carbon fiber composite material rod and a wrapping tape wrapped around the outer surface of the carbon fiber composite material rod.

[0055] In some embodiments of the present invention, the present invention further provides the above-mentioned sheath for carbon fiber composite cable and / or use of the above-mentioned carbon fiber composite cable in bridges or offshore equipment.

[0056] The following is a further detailed description of the specific implementation of the present invention in conjunction with specific embodiments:

[0057] The outer protective layer 1 in the embodiment of the present invention is prepared by the hot extrusion technology in the prior art, and the inner protective layer 2 is prepared by the 3D printing technology in the prior art.

[0058] Example 1

[0059] like Figure 1 As shown in the structural diagram, this example provides a double-layer impact-resistant sheath suitable for Specifications of carbon fiber composite cables, including: The specifications indicate a bundle of seven 5mm diameter carbon fiber composite rods. This double-layer impact-resistant sheath consists of an outer protective layer 1 and an inner protective layer 2. The outer protective layer 1 is positioned on the outer surface of the inner protective layer 2, which is positioned on the outer surface of the carbon fiber composite core. The carbon fiber composite core comprises carbon fiber composite rods 3 and a polyester fiber wrapping tape 4 wrapped around the outer surface of the carbon fiber composite rods 3.

[0060] like Figure 2 As shown, the cross-sectional shape of the double-layer impact-proof sheath in this example is circular on the outside and regular hexagonal on the inside. The material of the outer protective layer 1 is a solid high-density polyethylene material, and its geometric shape is a cylindrical tube with an outer diameter of 24mm, an inner diameter of 18mm, and a wall thickness of 3mm. The material of the inner protective layer 2 is a polyurethane resin material with a convex hexagonal honeycomb structure, that is, a porous polyurethane material composed of regular convex hexagonal units (i.e., convex hexagonal honeycomb cells 5) arranged periodically. The geometric shape of the inner protective layer 2 is a hollow cylinder with a circular exterior and an outer diameter of 18mm. The cross-sectional shape of the hollow core is a regular hexagonal with rounded corners. The diagonal length of the inner regular hexagon is 15mm, and the fillet radius is 2.5mm. The raw material for the preparation of the polyurethane resin material is thermoplastic polyurethane elastomer (TPU) produced by Dake Intelligent Equipment Co., Ltd., with a particle diameter of 1.75mm and a hardness of 95A. The convex hexagonal honeycomb cells 5 in the inner protective layer 2 have a length of 3 mm, a width of 2 mm, and a wall thickness of 0.4 mm.

[0061] With reference to the "Standard Test Method for Static Energy Absorption Properties of Honeycomb Sandwich Core Materials (ASTM D7336 / D7336M-22)", a uniaxial compression test was conducted on a polyurethane cube specimen with the same cell as the inner protective layer 2 in this example using an Instron 5985 testing machine. The side length of the cube specimen was 20 mm and the loading rate was 5 mm / min. The test results showed that the macroscopic density of the cube specimen of this cell was 493 kg / m 3 (much less than the density of HDPE 984kg / m3 ), the axial compression energy absorption is about 0.28MJ / m 3 .

[0062] Example 2

[0063] like Figure 1 As shown in the structural diagram in this example, a double-layer impact-proof sheath is provided, which is suitable for Specifications of carbon fiber composite cables, including: The specifications indicate a bundle of seven 5mm diameter carbon fiber composite rods. This double-layer impact-resistant sheath consists of an outer protective layer 1 and an inner protective layer 2. The outer protective layer 1 is positioned on the outer surface of the inner protective layer 2, which is positioned on the outer surface of the carbon fiber composite core. The carbon fiber composite core comprises carbon fiber composite rods 3 and a polyester fiber wrapping tape 4 wrapped around the outer surface of the carbon fiber composite rods 3.

[0064] like Figure 3 As shown, the cross-sectional shape of the double-layer anti-impact sheath in this example is circular on the outside and regular hexagonal with rounded corners on the inside. The material of the outer protective layer 1 is a high-density polyethylene material with a solid structure, and its geometric shape is a cylindrical tube with an outer diameter of 24 mm, an inner diameter of 18 mm, and a wall thickness of 3 mm. The material of the inner protective layer 2 is a polyurethane resin material, which has a concave hexagonal honeycomb structure, that is, a porous polyurethane material composed of regular concave hexagonal units (i.e., concave hexagonal honeycomb cells 6) arranged periodically. The geometric shape of the inner protective layer 2 is a hollow cylinder with an outer diameter of 18 mm, wherein the cross-sectional shape of the hollow core is a regular hexagon with rounded corners, and the diagonal length of the inner regular hexagon with rounded corners is 15 mm and the fillet radius is 2.5 mm. The preparation material of the polyurethane resin material is thermoplastic polyurethane elastomer (TPU), the average particle diameter is 1.75 mm, and the hardness is 95A. The concave-angle hexagonal honeycomb cell 6 has a length of 3 mm, a width of 2 mm, a wall thickness of 0.4 mm, and a concave angle of -30°.

[0065] With reference to the "Standard Test Method for Static Energy Absorption Properties of Honeycomb Sandwich Core Materials (ASTM D7336 / D7336M-22)", a uniaxial compression test was conducted on a polyurethane cube specimen with the same cell as the inner protective layer 2 in this example using an Instron 5985 testing machine. The side length of the cube specimen was 20 mm and the loading rate was 5 mm / min. The test results showed that the macroscopic density of the cube specimen of this cell was 416 kg / m 3 (much less than the density of HDPE 984kg / m 3 ), the axial compression energy absorption is about 0.21MJ / m3 , the Poisson's ratio is about -0.14. In this example, the Poisson's ratio of the inner protective layer 2 is negative, and when subjected to external impact, it exhibits the characteristics of simultaneous contraction in the transverse and longitudinal directions, and has excellent impact resistance.

[0066] Example 3

[0067] like Figure 1 As shown in the structural diagram in this example, a double-layer impact-proof sheath is provided, which is suitable for Specifications of carbon fiber composite cables, including: The specifications indicate a bundle consisting of 19 carbon fiber composite rods with a diameter of 5 mm. This double-layer impact-resistant sheath consists of an outer protective layer 1 and an inner protective layer 2. The outer protective layer 1 is positioned on the outer surface of the inner protective layer 2, which is positioned on the outer surface of the carbon fiber composite core. The carbon fiber composite core comprises carbon fiber composite rods 3 and a polyester fiber wrapping tape 4 wrapped around the outer surface of the carbon fiber composite rods 3.

[0068] like Figure 4 As shown, the cross-section of the double-layer impact-resistant jacket in this example is circular on the outside and regular hexagonal on the inside. The outer protective layer 1 is made of a solid carbon fiber-reinforced epoxy resin material and is a cylindrical tube with an outer diameter of 35 mm, an inner diameter of 31 mm, and a wall thickness of 2 mm. The inner protective layer 2 is made of polylactic acid resin and is a hollow cylinder with an outer diameter of 31 mm. The cross-section of the hollow core is a regular hexagon with rounded corners. The diagonal length of the regular hexagon on the inside is 25 mm, and the fillet radius is 2.5 mm. The inner protective layer 2 has a helical curved icosahedral cell, also known as a Gyroid cell, which is a triply periodic minimum surface structure proposed mathematically by physicist Alan Schoen in the 1970s. This structure is also widely found in nature, such as in cell membranes, butterfly wing scales, and beetle elytra. Due to its low density and high strength, this structure has been applied in the fields of mechanics, catalysis, electricity, and optical materials. The Gyroid cell 7 of the inner protective layer 2 has a length of 5 mm, a width of 5 mm, and a wall thickness of 1 mm.

[0069] Based on the Standard Test Method for Static Energy Absorption Properties of Honeycomb Sandwich Core Materials (ASTM D7336 / D7336M-22), uniaxial compression tests were conducted on polylactic acid resin cubic specimens using Gyroid cell 7 using an Instron 5985 testing machine. The side length of the cubic specimen was 20 mm, and the loading rate was 5 mm / min. The test results showed that the macroscopic density of the cubic specimen of this cell was 838 kg / m 3 (less than HDPE density 984kg / m 3 ), the axial compression energy absorption is about 17.2MJ / m 3 .

[0070] The uniaxial compression pressure-compression deformation relationship curves of polylactic acid resin cubes and solid high-density polyethylene cubes were tested respectively. The specific test method is as follows: prepare three polylactic acid resin cube specimens and three solid high-density polyethylene cubes respectively. The size of the cube specimens is 20 mm in side length. The test method refers to ASTM D7336 / D7336M-22. The loading rate is 5 mm / min. The average value of the uniaxial compression pressure-compression deformation of the three cube specimens is taken to draw a curve. Figure 5 As shown. Figure 5 It can be seen that when both are subjected to the same 5mm compression deformation (corresponding to the typical operating conditions in real applications: both are impacted by an external object and experience the same compression deformation), the internal force of the solid HDPE is 18kN (approximately 1.8 tons), while the internal force of the Gyroid cellular PLA resin is only 5kN (approximately 500kg). According to Newton's third law, the force exerted by the solid HDPE on the carbon fiber composite core it protects is 18kN, far greater than that of the Gyroid cellular PLA resin. This means that the carbon fiber composite core within the solid HDPE sheath suffers more severe damage than the carbon fiber composite core within the Gyroid cellular PLA resin sheath. Furthermore, when both are subjected to the same external force (corresponding to the typical operating conditions in real applications: both are impacted by an external object and experience the same impact force), for example, 10kN (approximately 1 ton), the solid HDPE compresses by approximately 1mm, while the Gyroid cellular PLA resin compresses by approximately 10mm. This shows that Gyroid cell polylactic acid resin has lower stiffness and can produce larger collapse deformation, thus providing better impact protection for the carbon fiber composite core.

[0071] In summary, the present invention adopts a solid outer protective layer and an inner protective layer with a honeycomb structure, so that the sheath has a large compression deformation, strong energy absorption capacity, and good impact protection effect. At the same time, it also has the characteristics of light weight and strong designability. When applied to carbon fiber composite cables, it can significantly improve the lateral impact resistance of carbon fiber composite cables, reduce the dead weight of carbon fiber composite cables, and improve the load-bearing efficiency of the cables.

[0072] While the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A sheath for a carbon fiber composite cable, characterized by: The sheath comprises an outer protective layer and an inner protective layer; The inner protective layer has a porous structure; The material of the outer protective layer includes at least one of high-density polyethylene, epoxy resin, fiber-reinforced high-density polyethylene, and fiber-reinforced epoxy resin; The material of the inner protective layer includes at least one of polyurethane resin, silicone rubber, polylactic acid resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber.

2. The sheath for carbon fiber composite cable according to claim 1, characterized in that: The fibers in the fiber-reinforced high-density polyethylene, fiber-reinforced epoxy resin, fiber-reinforced polyurethane resin, and fiber-reinforced silicone rubber are independently selected from at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and polypropylene fiber.

3. The sheath for carbon fiber composite cable according to claim 1, characterized in that: The porous structure has at least one pore structure selected from a regular pore structure, a disordered pore structure, a bionic pore structure, and a gradient pore structure.

4. The sheath for a carbon fiber composite cable according to claim 1, characterized in that: The porous structure contains pores; the structure of the pores includes at least one of a hexagon, a triangle, a square, a circle, a convex hexagon, a concave hexagon, a double V-shape, a tetradecahedron, a helical curved icosahedron, and a star.

5. The sheath for carbon fiber composite cable according to claim 1, characterized in that: The thickness of the outer protective layer and the inner protective layer are 1 to 10 mm respectively.

6. The sheath for carbon fiber composite cable according to claim 1, characterized in that: The cross-sectional shape of the hollow core of the inner protective layer is a regular hexagon with rounded corners; And / or, the outer protective layer is in the shape of a hollow cylinder.

7. The sheath for a carbon fiber composite cable according to any one of claims 1 to 6, characterized in that: The outer protective layer has a stiffness greater than that of the inner protective layer; And / or, the Poisson's ratio of the inner protective layer is less than 0.

8. A carbon fiber composite cable, characterized in that: The invention comprises a carbon fiber composite material core and a sheath for a carbon fiber composite material cable according to any one of claims 1 to 7; the sheath is arranged outside the carbon fiber composite material core.

9. The carbon fiber composite cable according to claim 8, characterized in that: The carbon fiber composite material core comprises a carbon fiber composite material rod and a wrapping tape wrapped around the outer surface of the carbon fiber composite material rod.

10. Use of the sheath for carbon fiber composite cable according to any one of claims 1 to 7 and / or the carbon fiber composite cable according to any one of claims 8 to 9 in bridges or offshore equipment.

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