Fiber reinforced composite material imitating hedgehog thorn internal microstructure and preparation method thereof

Abstract

The invention discloses a hedgehog calthrop-like internal microstructure fiber reinforced composite material and a preparation method thereof. The fiber reinforced composite material comprises an upper fiber resin layer, a middle fiber layer and a lower fiber resin layer which are connected in sequence, the middle fiber layer comprises a first connecting fiber and a second connecting fiber, and the floating layer is interwoven on an upper fiber layer of the upper fiber resin layer and a lower fiber layer of the lower fiber resin layer; the first connecting fibers and the second connecting fibers are staggered; the plurality of upper spiral fiber groups and the plurality of lower spiral fiber groups are used for connecting the first connecting fiber with the second connecting fiber. A regular porous structure is formed between the upper fiber resin layer and the lower fiber resin layer, the upper fiber resin layer and the lower fiber resin layer imitate the outer layers of hedgehog thorns, the middle fiber layer imitates the inner layers of hedgehog thorns, and the middle fiber layer plays a supporting role to support the upper fiber resin layer and the lower fiber resin layer. Good light weight and high strength performance are realized.

Description

Technical Field

[0001] The invention relates to the technical field of fiber composite materials, and in particular to a fiber reinforced composite material imitating the internal microstructure of hedgehog spines and a preparation method thereof. Background Art

[0002] Lightweight, high-strength advanced engineering materials designed with inspiration from biological structures have excellent structural and mechanical properties. Fiber-reinforced composite materials are one of the hot research directions for lightweight, high-strength advanced engineering materials. For example, carbon fiber-reinforced composite materials with periodic spiral structures that mimic mantis shrimp exoskeletons are prepared using 3D printing technology and have high strength, high toughness, and lightweight synergy. The performance of different biological structures varies greatly, and the lightweight and high-strength performance of fiber-reinforced composite materials based on bionic structures in the existing technology still needs to be improved.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a fiber-reinforced composite material imitating the internal microstructure of hedgehog spines and a preparation method thereof are provided, aiming to solve the problem that the lightweight and high-strength performance of fiber-reinforced composite materials based on bionic structures in the prior art still needs to be improved.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, comprising: an upper fiber resin layer, a middle fiber layer and a lower fiber resin layer connected in sequence; wherein the middle fiber layer comprises:

[0007] A plurality of first connecting fibers and a plurality of second connecting fibers are uniformly interwoven in the upper fiber layer of the upper fiber resin layer and the lower fiber layer of the lower fiber resin layer; the first connecting fibers and the second connecting fibers are staggered;

[0008] A plurality of upper spiral fiber groups and a plurality of lower spiral fiber groups are located between the upper fiber resin layer and the lower fiber resin layer, and connect the first connecting fiber and the second connecting fiber.

[0009] The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the first connecting fiber and the second connecting fiber both include:

[0010] an upper winding portion, wound around the upper fiber layer;

[0011] A lower winding portion, wound around the lower fiber layer;

[0012] A positive S-shaped portion and a reverse S-shaped portion, with two ends respectively connected to the upper winding portion and the lower winding portion;

[0013] Wherein, the positive S-shaped portion of the first connecting fiber and the negative S-shaped portion of the second connecting fiber are located at corresponding positions.

[0014] The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the upper spiral fiber group and the lower spiral fiber group both include:

[0015] The three spiral fibers all sequentially pass through the positive S-shaped portion of the first connecting fiber and the reverse S-shaped portion of the second connecting fiber, or all sequentially pass through the reverse S-shaped portion of the first connecting fiber and the positive S-shaped portion of the second connecting fiber;

[0016] Among them, the helical phases of various helical fibers are different.

[0017] The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the upper fiber layer and the lower fiber layer both include:

[0018] Several transverse fibers and several longitudinal fibers;

[0019] Wherein, the transverse fibers and the longitudinal fibers are interwoven with each other.

[0020] The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the first connecting fibers and the second connecting fibers are both floating and sinking and interwoven with the longitudinal fibers.

[0021] The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the longitudinal fibers are straight and the transverse fibers are corrugated.

[0022] The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the fibers used in the middle fiber layer, the upper fiber layer and the lower fiber layer are selected from one of carbon fiber, basalt fiber, aramid fiber and Kevlar fiber.

[0023] A method for preparing a fiber-reinforced composite material imitating the internal microstructure of hedgehog spines as described in any one of the above, comprising the following steps:

[0024] Provide fiber and resin materials;

[0025] Fixing two rows of fibers along a first direction, weaving fibers along a second direction on each row of fixed fibers to form an upper fiber layer and a lower fiber layer, and weaving fibers between the two rows of fixed fibers to form a first connecting fiber and a second connecting fiber;

[0026] Helically weaving fibers on the first connecting fibers and the second connecting fibers to form an upper helical fiber group and a lower helical fiber group;

[0027] Resin material is coated on the upper fiber layer and the lower fiber layer respectively and cured to obtain a fiber-reinforced composite material that simulates the internal microstructure of hedgehog spines.

[0028] The method for preparing the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the fibers are spirally woven on the first connecting fibers and the second connecting fibers to form an upper spiral fiber group and a lower spiral fiber group, comprises:

[0029] On a row of fiber segments formed by the first connecting fibers and the second connecting fibers in the first direction, fibers are spirally woven every three fiber segments; wherein the three fiber segments separated by each other in the fibers spirally woven with different spiral phases are not completely the same.

[0030] The method for preparing the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines, wherein the resin material is cured by heating.

[0031] Beneficial effects: The present application forms a regular porous structure between the upper fiber resin layer and the lower fiber resin layer, and the upper fiber resin layer and the lower fiber resin layer imitate the outer layer of hedgehog spines, and the middle fiber layer imitates the inner layer of hedgehog spines. The middle fiber layer plays a supporting role, supporting the upper fiber resin layer and the lower fiber resin layer, and has good light weight and high strength performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a scanning electron microscope image of the internal microstructure of the spines of a Western European hedgehog.

[0033] Figure 2 Schematic diagram of the structure of a fiber-reinforced composite material that simulates the internal microstructure of hedgehog spines in an embodiment of the present invention.

[0034] Figure 3 It is a side view of a fiber-reinforced composite material that simulates the internal microstructure of hedgehog spines in an embodiment of the present invention.

[0035] Figure 4 Schematic diagram of the structure of the upper fiber layer, the middle fiber layer and the lower fiber layer in an embodiment of the present invention.

[0036] Figure 5 4 is a cross-sectional view of an upper fiber layer, a middle fiber layer and a lower fiber layer in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 10. Upper fiber resin layer; 11. Upper fiber layer; 111. Transverse fibers; 112. Longitudinal fibers; 12. Upper resin layer; 20. Middle fiber layer; 21. First connecting fibers; 22. Second connecting fibers; 201. Upper winding portion; 202. Lower winding portion; 203. Positive S-shaped portion; 204. Inverse S-shaped portion; 23. Upper spiral fiber group; 24. Lower spiral fiber group; 205. Spiral fibers; 30. Lower fiber resin layer; 31. Lower fiber layer; 311. Transverse fibers; 312. Longitudinal fibers; 32. Lower resin layer. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Please also see Figure 1-Figure 5 The present invention provides some embodiments of a fiber-reinforced composite material that simulates the internal microstructure of a hedgehog spine.

[0041] like Figure 2 As shown, the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines of the present invention comprises: an upper fiber resin layer 10, a middle fiber layer 20 and a lower fiber resin layer 30 connected in sequence. The middle fiber layer 20 comprises:

[0042] A plurality of first connecting fibers 21 and a plurality of second connecting fibers 22 are uniformly interwoven in the upper fiber layer 11 of the upper fiber resin layer 10 and the lower fiber layer 31 of the lower fiber resin layer 30; the first connecting fibers 21 and the second connecting fibers 22 are staggered;

[0043] A plurality of upper spiral fiber groups 23 and a plurality of lower spiral fiber groups 24 are located between the upper fiber resin layer 10 and the lower fiber resin layer 30 , and connect the first connecting fiber 21 and the second connecting fiber 22 .

[0044] Specifically, the fiber-reinforced composite material simulates the internal microstructure of the hedgehog (specifically Erinaceus europaeus, the Western European hedgehog) spines, and the internal microstructure of the hedgehog spines is as follows: Figure 1 As shown, both sides are the outer layer of hedgehog spines, and the middle is the inner layer of hedgehog spines. The outer layer has an axial structure and a radial structure, and the inner layer has a radial structure, and the radial structure of the inner layer is connected to multiple radial structures of the outer layer. Figure 2As shown, the dotted line represents the resin layer. The upper fiber resin layer 10 and the lower fiber resin layer 30 in the fiber reinforced composite material of the present application imitate the outer layer of hedgehog spines. The middle fiber layer 20 imitates the inner layer of hedgehog spines, and the first connecting fiber 21 and the second connecting fiber 22 are divided into three parts by the upper spiral fiber group 23 and the lower spiral fiber group 24, namely, an inverted eight part, a vertical part and a regular eight part. The vertical part serves as the radial structure of the inner layer, and the inverted eight part and the regular eight part serve as the connection structure between the radial structure of the inner layer and the radial structure of the outer layer. The upper spiral fiber group 23 and the lower spiral fiber group 24 connect the multiple first connecting fibers 21 and the second connecting fibers 22, and make the vertical part maintain a vertical state, and the position of the upper spiral fiber group 23 and the position of the lower spiral fiber group 24 are not easy to move. The present application forms a regular porous structure between the upper fiber resin layer 10 and the lower fiber resin layer 30, and the upper fiber resin layer 10 and the lower fiber resin layer 30 imitate the outer layer of hedgehog spines, and the middle fiber layer 20 imitates the inner layer of hedgehog spines. The middle fiber layer 20 plays a supporting role, supporting the upper fiber resin layer 10 and the lower fiber resin layer 30, and has good light weight and high strength performance.

[0045] When fiber-reinforced composite materials are subjected to external loads, a large number of internal fiber bundles undergo filament bridging, dislocation slippage and twisting, thereby achieving internal toughening of the fibers. The fiber density is highest at the outer edge and decreases gradually inward to form a gradient porous structure. Compared with the uniformly distributed structure of the same number of fibers, this gradient porous structure significantly improves the bending stiffness per unit mass, can improve the mechanical properties by alleviating stress concentration or singularities, and has very high mechanical efficiency. The outer layer of the gradient structure with high fiber content, large modulus and stiffness is subjected to strong impact, while the inner layer with low fiber content and small modulus is subjected to large tensile strain and absorbs more energy, so that the external energy is reasonably distributed within the system, delaying the occurrence of failure and improving the mechanical properties.

[0046] The upper fiber resin layer 10 includes an upper resin layer 12 and an upper fiber layer 11 , wherein the upper fiber layer 11 is embedded in the upper resin layer 12 . The lower fiber resin layer 30 includes a lower resin layer 32 and a lower fiber layer 31 , wherein the lower fiber layer 31 is embedded in the lower resin layer 32 .

[0047] In a preferred implementation of the embodiment of the present invention, Figure 2-Figure 3 As shown, the first connecting fiber 21 and the second connecting fiber 22 both include:

[0048] An upper winding portion 201, wound around the upper fiber layer 11;

[0049] A lower winding portion 202, wound around the lower fiber layer 31;

[0050] The positive S-shaped portion 203 and the reverse S-shaped portion 204 have two ends connected to the upper winding portion 201 and the lower winding portion 202 respectively;

[0051] The positive S-shaped portion 203 of the first connecting fiber 21 and the negative S-shaped portion 204 of the second connecting fiber 22 are located at corresponding positions.

[0052] Specifically, the first connecting fiber 21 and the second connecting fiber 22 are both floating and sinking and interweaving between the upper fiber layer 11 and the lower limiting layer. When the first connecting fiber 21 and the second connecting fiber 22 are floating and sinking and interweaving, the positions of the two are staggered. In the first connecting fiber 21 and the second connecting fiber 22, there are multiple interconnected repeating units, and each repeating unit has an upper winding portion 201, an inverted S-shaped portion 204, a lower winding portion 202 and a positive S portion connected in sequence. Since the position of the first connecting fiber 21 and the position of the second connecting fiber 22 are staggered, the position of the positive S-shaped portion 203 of the first connecting fiber 21 corresponds to the position of the inverted S-shaped portion 204 of the second connecting fiber 22, and the position of the inverted S-shaped portion 204 of a connecting fiber corresponds to the position of the positive S-shaped portion 203 of the second connecting fiber 22. The upper spiral fiber group 23 is located in the upper half of the positive S-shaped portion 203 and the inverted S-shaped portion 204, and the lower spiral fiber group 24 is located in the lower half of the positive S-shaped portion 203 and the inverted S-shaped portion 204. The upper winding portion 201 is wound around the upper fiber layer 11 , and the lower winding portion 202 is wound around the lower fiber layer 31 .

[0053] In a preferred implementation of the embodiment of the present invention, Figure 3-Figure 4 As shown, the upper spiral fiber group 23 and the lower spiral fiber group 24 both include:

[0054] The three spiral fibers 205 all pass through the positive S-shaped portion 203 of the first connecting fiber 21 and the reverse S-shaped portion 204 of the second connecting fiber 22 in sequence, or all pass through the reverse S-shaped portion 204 of the first connecting fiber 21 and the positive S-shaped portion 203 of the second connecting fiber 22 in sequence;

[0055] The helical phases of the helical fibers 205 are different.

[0056] Specifically, the upper spiral fiber group 23 has three spiral fibers 205, and the lower spiral fiber group 24 has three spiral fibers 205. The spiral fibers 205 are usually in the form of fiber bundles, and the spiral fibers 205 are in a spiral shape. When the three spiral fibers 205 are spirally distributed, the spiral phases of the spiral fibers 205 are different, and they can form a whole and are spirally wound together. The spiral phases of the three spiral fibers 205 are different, and the positions of the spiral fibers 205 on the cross-section of the three spiral fibers 205 are different. The three spiral fibers 205 are also wound around the first connecting fibers 21 and the second connecting fibers 22, and the three spiral fibers 205 connect the multiple first connecting fibers 21 and the multiple second connecting fibers 22.

[0057] In a preferred implementation of the embodiment of the present invention, Figure 2-Figure 4 As shown, the upper fiber layer 11 and the lower fiber layer 31 both include:

[0058] Several transverse fibers and several longitudinal fibers;

[0059] Wherein, the transverse fibers and the longitudinal fibers are interwoven with each other.

[0060] Specifically, the upper fiber layer 11 and the lower fiber layer 31 may adopt the same structure. The transverse fibers extend in the transverse direction, and the longitudinal fibers extend in the longitudinal direction. The extension direction of the transverse fibers 111 in the upper fiber layer 11 is the same as the extension direction of the transverse fibers 311 in the lower fiber layer 31, and the extension direction of the longitudinal fibers 112 in the upper fiber layer 11 is the same as the extension direction of the longitudinal fibers 312 in the lower fiber layer 31. The transverse fibers and the longitudinal fibers are interwoven to form the upper fiber layer 11 and the lower fiber layer 31. The transverse fibers and the longitudinal fibers may be interwoven in a floating and sinking manner.

[0061] In a preferred implementation of the embodiment of the present invention, Figure 2-Figure 4 As shown, the first connecting fibers 21 and the second connecting fibers 22 are both floating and interwoven with the longitudinal fibers.

[0062] Specifically, the extension direction of the first connecting fiber 21 and the extension direction of the second connecting fiber 22 can be both transverse or both longitudinal. When the first connecting fiber 21 and the second connecting fiber 22 float and sink and interweave with the longitudinal fibers, the extension direction of the first connecting fiber 21 and the extension direction of the second connecting fiber 22 are both transverse. The transverse fibers imitate the axial structure of the outer layer of the hedgehog spines, and the longitudinal fibers imitate the radial structure of the outer layer of the hedgehog spines.

[0063] In a preferred implementation of the embodiment of the present invention, Figure 2-Figure 4 As shown, the longitudinal fibers are straight and the transverse fibers are corrugated.

[0064] Specifically, the longitudinal fibers can be straight fibers, and the transverse fibers can be corrugated fibers. The transverse fibers can be strip-shaped transverse fibers, and the first connecting fibers 21 and the second connecting fibers 22 can also be strip-shaped connecting fibers. The upper winding portion 201 and the lower winding portion 202 of the strip-shaped connecting fibers can be clamped by the strip-shaped transverse fibers and the longitudinal fibers, that is, the upper winding portion 201 of the strip-shaped connecting fibers is located between the strip-shaped transverse fibers and the longitudinal fibers in the upper fiber layer 11, and the lower winding portion 202 of the strip-shaped connecting fibers is located between the strip-shaped transverse fibers and the longitudinal fibers in the lower fiber layer 31.

[0065] In a preferred implementation of the embodiment of the present invention, the fibers used in the middle fiber layer 20, the upper fiber layer 11 and the lower fiber layer 31 are selected from one of carbon fiber, basalt fiber, aramid fiber and Kevlar fiber.

[0066] Specifically, the fibers used in the middle fiber layer 20, the fibers used in the upper fiber layer 11, and the fibers used in the lower fiber layer 31 can be the same fibers or different fibers. Based on the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines described in any of the above embodiments, the present invention also provides a preferred embodiment of a method for preparing a fiber-reinforced composite material imitating the internal microstructure of hedgehog spines:

[0067] The method for preparing the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to the embodiment of the present invention comprises the following steps:

[0068] Step S100, providing fiber and resin materials;

[0069] Step S200, fixing two rows of fibers along a first direction, weaving fibers on each row of fixed fibers along a second direction to form an upper fiber layer and a lower fiber layer, and weaving fibers between the two rows of fixed fibers to form a first connecting fiber and a second connecting fiber;

[0070] Step S300, spirally weaving fibers on the first connecting fibers and the second connecting fibers to form an upper spiral fiber group and a lower spiral fiber group;

[0071] Step S400: coating resin material on the upper fiber layer and the lower fiber layer respectively and curing them to obtain a fiber-reinforced composite material that simulates the internal microstructure of hedgehog spines.

[0072] Specifically, when preparing a fiber-reinforced composite material, the first direction and the second direction can be mutually perpendicular directions, namely, longitudinal and transverse directions, respectively. First, two rows of upper and lower fibers are longitudinally fixed as longitudinal fibers, and then fibers are transversely woven on the longitudinal fibers as transverse fibers to form an upper fiber layer and a lower fiber layer, respectively, and fibers are woven between the two rows of longitudinal fibers to form a first connecting fiber and a second connecting fiber. Then, fibers are spirally woven on the first connecting fiber and the second connecting fiber to form an upper spiral fiber group and a lower spiral fiber group. Finally, a resin material is coated on the upper fiber layer and the lower fiber layer and cured to obtain a fiber-reinforced composite material. The resin material is cured by heating.

[0073] Step S300 specifically includes:

[0074] Step S310: On a row of fiber segments formed by the first connecting fibers and the second connecting fibers in a first direction, fibers are spirally braided every three fiber segments; wherein three fiber segments separated by fibers spirally braided in different spiral phases are not completely the same.

[0075] Specifically, the first connecting fiber and the second connecting fiber are wound between the upper fiber layer and the lower fiber layer, and the upper fiber layer and the lower fiber layer are used as boundaries to divide the first connecting fiber and the second connecting fiber into a plurality of fiber segments (both the positive S-shaped portion and the reverse S-shaped portion can be regarded as fiber segments), and then there are a plurality of fiber segments between the upper fiber layer and the lower fiber layer, forming a row of fiber segments in the first direction. Fibers are helically woven on this row of fiber segments to form an upper spiral fiber group and a lower spiral fiber group.

[0076] When the fibers are spirally woven, the fibers are staggered on the left and right sides of a row of fiber segments, and the side of the fibers is changed every three fiber segments. For example, the fibers are located on the left side of a row of fiber segments, and after passing through three fiber segments, the fibers are interspersed to the right side of a row of fiber segments, and after passing through three fiber segments, the fibers are interspersed back to the left side of a row of fiber segments. Three spirally woven fibers form a spiral fiber group, and the spirally woven fibers themselves are spiral-shaped. The three spirally woven fibers in the same spiral fiber group are all spiral-shaped. The spiral phases of the three spirally woven fibers in the same spiral fiber group are different, so the three fiber segments separated by the spirally woven fibers with different spiral phases are not exactly the same. For example, the fiber segments in a row are recorded as: a, b, c, d, e, f, g, h, i. The first fiber in the same spiral fiber group is interspersed with a, b, c as a group of fiber segments, d, e, f as a group of fiber segments, and g, h, i as a group of fiber segments; the second fiber in the same spiral fiber group is interspersed with c, d, e as a group of fiber segments, and f, g, h as a group of fiber segments; the second fiber in the same spiral fiber group is interspersed with b, c, d as a group of fiber segments, and e, f, g as a group of fiber segments. Fibers helically woven with different helical phases can wrap all fiber segments between the helically woven fibers, thereby fixing the fiber segments. Each fiber segment is clamped by three fibers in the same spiral fiber group.

[0077] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A fiber-reinforced composite material that simulates the internal microstructure of hedgehog spines, comprising: The upper fiber resin layer, the middle fiber layer and the lower fiber resin layer are connected in sequence; characterized in that the middle fiber layer comprises: A plurality of first connecting fibers and a plurality of second connecting fibers are uniformly interwoven in the upper fiber layer of the upper fiber resin layer and the lower fiber layer of the lower fiber resin layer; the first connecting fibers and the second connecting fibers are staggered; A plurality of upper spiral fiber groups and a plurality of lower spiral fiber groups are located between the upper fiber resin layer and the lower fiber resin layer, and connect the first connecting fiber and the second connecting fiber.

2. The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to claim 1, characterized in that: The first connecting fiber and the second connecting fiber both include: an upper winding portion, wound around the upper fiber layer; A lower winding portion, wound around the lower fiber layer; A positive S-shaped portion and a reverse S-shaped portion, with two ends respectively connected to the upper winding portion and the lower winding portion; Wherein, the positive S-shaped portion of the first connecting fiber and the negative S-shaped portion of the second connecting fiber are located at corresponding positions.

3. The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to claim 2, characterized in that: The upper spiral fiber group and the lower spiral fiber group both include: The three spiral fibers all sequentially pass through the positive S-shaped portion of the first connecting fiber and the reverse S-shaped portion of the second connecting fiber, or all sequentially pass through the reverse S-shaped portion of the first connecting fiber and the positive S-shaped portion of the second connecting fiber; Among them, the helical phases of various helical fibers are different.

4. The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to any one of claims 1 to 3, characterized in that: The upper fiber layer and the lower fiber layer both include: Several transverse fibers and several longitudinal fibers; Wherein, the transverse fibers and the longitudinal fibers are interwoven with each other.

5. The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to claim 4, characterized in that: The first connecting fibers and the second connecting fibers are both floating and interwoven with the longitudinal fibers.

6. The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to claim 5, characterized in that: The longitudinal fibers are in a straight line shape, and the transverse fibers are in a corrugated shape.

7. The fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to any one of claims 1 to 3, characterized in that: The fibers used in the middle fiber layer, the upper fiber layer and the lower fiber layer are selected from one of carbon fiber, basalt fiber, aramid fiber and Kevlar fiber.

8. A method for preparing a fiber-reinforced composite material imitating the internal microstructure of hedgehog spines as claimed in any one of claims 1 to 7, characterized in that: The steps include: Provide fiber and resin materials; Fixing two rows of fibers along a first direction, weaving fibers along a second direction on each row of fixed fibers to form an upper fiber layer and a lower fiber layer, and weaving fibers between the two rows of fixed fibers to form a first connecting fiber and a second connecting fiber; Helically weaving fibers on the first connecting fibers and the second connecting fibers to form an upper helical fiber group and a lower helical fiber group; Resin material is coated on the upper fiber layer and the lower fiber layer respectively and cured to obtain a fiber-reinforced composite material that simulates the internal microstructure of hedgehog spines.

9. The method for preparing the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to claim 8, characterized in that: The method of spirally weaving fibers on the first connecting fibers and the second connecting fibers to form an upper spiral fiber group and a lower spiral fiber group comprises: On a row of fiber segments formed by the first connecting fibers and the second connecting fibers in the first direction, fibers are spirally woven every three fiber segments; wherein the three fiber segments separated by each other in the fibers spirally woven with different spiral phases are not completely the same.

10. The method for preparing the fiber-reinforced composite material imitating the internal microstructure of hedgehog spines according to claim 9, characterized in that: The resin material is cured by heating.

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