A high-strength corrugated core thin-walled sandwich tube beam and its preparation method

Abstract

The present invention discloses a high-strength corrugated core thin-walled sandwich tube beam and a preparation method thereof, belonging to the technical field of aircraft. The high-strength corrugated core thin-walled sandwich tube beam includes a cylindrical corrugated core, an outer tube is arranged on the outer surface of the corrugated core, an inner tube is arranged on the inner surface of the corrugated core, and a strengthening structure is arranged on the corrugated core, and the strengthening structures are distributed in a linear array along the length direction of the corrugated core; the cross section of the corrugated core is a trapezoidal structure, and the strengthening structure includes strengthening blocks embedded in the trapezoidal cavities of the corrugated core, and an annular strengthening band is arranged outside the strengthening blocks, and the strengthening band is connected with the corrugated core. By adopting the high-strength corrugated core thin-walled sandwich tube beam and the preparation method thereof of the present invention, by arranging an axial corrugated core in the thin-walled sandwich of the tube beam, the axial stiffness and strength of the tube beam are improved, and the bending load-bearing efficiency and structural stability of the tube beam are improved; strengthening blocks and strengthening bands distributed in an annular shape are arranged outside and inside the corrugated core to improve the stiffness of the structural surface of the tube beam.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft, and particularly to a high-strength corrugated core thin-walled sandwich tube beam and a preparation method thereof. Background Art

[0002] In the field of new energy aircraft, the aircraft needs to have an extremely light weight to ensure flight performance. Therefore, the lightweight design of the aircraft plays a very important role in the flight performance and safety of the aircraft. The tube beam in the aircraft is an important load-bearing structure in the aircraft. The thin-walled tube beam has a relatively light weight and has become a commonly used load-bearing structure for aircraft. The thin-walled tube beam bears a large bending load and axial stress in the aircraft, and the bending resistance performance and tensile and compressive performance of the thin-walled tube beam are very important.

[0003] The commonly used reinforcement method for thin-walled tube beams is to use beams with sandwich layers to improve the bending stiffness of thin-walled plates. Currently, commonly used sandwich layers include isotropic material sandwich cores such as foam sandwich cores, and sandwich cores with anisotropic characteristics such as honeycomb and honeycomb-like sandwich cores. However, at the same weight, the stiffness of the isotropic sandwich core is relatively low, and the main strength and stiffness directions of the honeycomb sandwich core face outwards, which are not conducive to improving the axial and radial strength of the tube.

[0004] The existing patent CN202311468257.5 discloses an efficient reinforced thin-walled tube beam applicable to ultra-low wing-loading aircraft, including a thin-walled tube beam, in which at least one multi-symmetry-plane reinforcement support column arranged at a set spacing is provided. The material of the multi-symmetry-plane reinforcement support column is the same as that of the thin-walled tube beam. The multi-symmetry-plane reinforcement support column includes two connection gaskets symmetrically arranged up and down, two side support flanges symmetrically arranged axially, and two support webs symmetrically arranged radially. The two support webs are symmetrically fixedly connected together to form a main support body, and the two side support flanges are respectively fixed on both sides of the main support body. The two ends of the support web and the side support flange are respectively connected to the two connection gaskets. An efficient reinforced thin-walled tube beam applicable to ultra-low wing-loading aircraft with the above structure effectively suppresses the cross-sectional deformation of the thin-walled tube beam, takes into account the requirements of high reinforcement effect and low weight, has a reliable structure, and is convenient to form and easy to assemble. However, the above patent mainly strengthens the tube beam radially through the support columns, there is a relatively large risk of local buckling, and the structural stability is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-strength corrugated core thin-walled sandwich tube beam and a preparation method thereof. By arranging an axial corrugated core in the thin-walled sandwich of the tube beam, the axial stiffness and strength of the tube beam are improved, and the bending load-bearing efficiency of the tube beam is increased; annularly distributed strengthening blocks and strengthening bands are arranged outside and inside the corrugated core to improve the stiffness of the structural surface of the tube beam.

[0006] To achieve the above object, the present invention provides a high-strength corrugated core thin-walled sandwich tube beam, which includes a cylindrical corrugated core. An outer tube is provided on the outer surface of the corrugated core, and an inner tube is provided on the inner surface of the corrugated core. A strengthening structure is provided on the corrugated core, and the strengthening structure is linearly arrayed along the length direction of the corrugated core; the cross-section of the corrugated core is a trapezoidal structure, and the strengthening structure includes strengthening blocks embedded in the trapezoidal cavities of the corrugated core. An annular strengthening band is provided outside the strengthening blocks, and the strengthening band is connected to the corrugated core.

[0007] Preferably, the corrugated core, the inner tube and the outer tube are high specific modulus composite materials.

[0008] Preferably, the strengthening structure includes an outer strengthening structure and an inner strengthening structure. The outer strengthening structure is provided between the corrugated core and the outer tube. The outer strengthening structure includes outer strengthening blocks, which are arranged in the trapezoidal cavities on the outer surface of the corrugated core. The outer strengthening blocks of the same outer strengthening structure are arranged on the same cross-section of the corrugated core. The bottom and both sides of the outer strengthening blocks are fixedly connected to the corrugated core. An outer strengthening band is provided outside the corrugated core, and the outer surface of the outer strengthening band is connected to the inner wall of the outer tube. The outer strengthening blocks and the corrugated core are alternately connected to the inner surface of the outer strengthening band.

[0009] Preferably, the inner strengthening structure is provided between the corrugated core and the inner tube. The inner strengthening structure includes inner strengthening blocks, which are arranged in the trapezoidal cavities on the inner surface of the corrugated core. The inner strengthening blocks and the outer strengthening blocks are spaced apart on the cross-section of the corrugated core; the inner strengthening blocks of the same inner strengthening structure are arranged on the same cross-section of the corrugated core. The bottom and both sides of the inner strengthening blocks are fixedly connected to the corrugated core. An inner strengthening band is provided inside the corrugated core, and the inner surface of the inner strengthening band is connected to the outer wall of the inner tube. The inner strengthening blocks and the corrugated core are alternately connected to the outer surface of the inner strengthening band.

[0010] Preferably, the outer strengthening blocks are adapted to the trapezoidal cavities on the outer surface of the corrugated core, and the inner strengthening blocks are adapted to the trapezoidal cavities on the inner surface of the corrugated core; both the outer strengthening blocks and the inner strengthening blocks are fiber-reinforced composite materials, and the reinforcing fibers of the outer strengthening blocks and the inner strengthening blocks are respectively arranged along the circumferential direction of the outer strengthening blocks and the inner strengthening blocks.

[0011] Preferably, both the outer strengthening band and the inner strengthening band are fiber-reinforced composite materials, and the reinforcing fibers of the outer strengthening band and the inner strengthening band are both arranged along the circumferential direction of the tube beam.

[0012] Preferably, an outer thickening strip is provided between the corrugated core and the outer tube. The outer thickening strip is arranged along the length direction of the corrugated core. An installation groove for the outer strengthening band to pass through is provided on the outer thickening strip. The outer thickening strip and the outer strengthening block are arranged at intervals on the outer surface of the corrugated core. An inner thickening strip is provided between the corrugated core and the inner tube. The inner thickening strip is arranged along the length direction of the corrugated core. An installation groove for the inner strengthening band to pass through is provided on the inner thickening strip. The inner thickening strip and the inner strengthening block are arranged at intervals on the inner surface of the corrugated core.

[0013] Preferably, both the outer thickening strip and the inner thickening strip are fiber-reinforced composite materials, and the reinforcing fibers of the outer thickening strip and the inner thickening strip are arranged along the axial direction of the pipe beam.

[0014] Preferably, the ratio of the spacing between the outer strengthening bands to the width of the outer strengthening bands is not less than 100.

[0015] The preparation method of the high-strength corrugated core thin-walled sandwich pipe beam described above includes the following steps:

[0016] S1. Cure the inner strengthening band on the outer surface of the inner tube, cure the inner strengthening block on the outer surface of the inner strengthening band, and cure the inner thickening strip on the outer surface of the inner tube. The inner thickening strip is located between two adjacent inner strengthening blocks.

[0017] S2. Sleeve the corrugated core outside the inner tube. The inner strengthening block is located in the trapezoidal cavity on the inner surface of the corrugated core. Cure the corrugated core with the inner thickening strip and the inner strengthening band.

[0018] S3. Cure the outer strengthening block in the trapezoidal cavity on the outer surface of the corrugated core, cure the outer strengthening band outside the outer strengthening block, and cure the outer thickening strip on the outer surface of the corrugated core. The outer thickening strip and the outer strengthening band are on the same cylindrical surface.

[0019] S4. Cure the outer tube outside the outer strengthening band and the outer thickening strip.

[0020] The advantages and positive effects of the high-strength corrugated core thin-walled sandwich pipe beam and its preparation method described in the present invention are as follows:

[0021] 1. A corrugated core is provided between the inner tube and the outer tube of the pipe beam. The main strength and stiffness directions of the corrugated core are parallel to the axial direction of the pipe beam, which improves the axial stiffness and strength of the pipe beam and the bending load-bearing efficiency of the pipe beam. The stiffness and strength of the pipe beam under the same weight are greatly improved compared with the scheme using isotropic sandwich cores such as foam.

[0022] 2. Outer strengthening blocks and inner strengthening blocks are embedded on the outer surface and the inner surface of the corrugated core, and outer strengthening bands and inner strengthening bands are provided, which make up for the shortcoming of insufficient out-of-plane stiffness of the corrugated core structure, can avoid corrugation collapse during the bending process; at the same time, it can also provide support during the forming process to avoid crushing of the corrugated core during the forming process.

[0023] 3. The corrugated core is in full contact with and bonded to the inner tube and the outer tube through the inner thickening strip and the outer thickening strip, which is not prone to defects such as debonding and further improves the bending strength of the corrugated core.

[0024] 4. The trapezoidal cavities of the corrugated core and the cavity structures of the inner strengthening block and the outer strengthening block are beneficial to maintaining good heat insulation performance inside the pipe beam and are beneficial to the aircraft to achieve the integrated design of energy storage - structure.

[0025] 5. The high-strength corrugated core thin-walled sandwich pipe beam described in the present invention is applied to an ultra-low wing-loading aircraft.

[0026] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0027] Figure 1 It is a hierarchical cross-sectional view of an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the distribution structure of the corrugated core and the strengthening structure of an embodiment of the present invention;

[0029] Figure 3 It is a three-dimensional structure schematic diagram of an embodiment of the present invention;

[0030] Figure 4 It is a partial cross-sectional structure schematic diagram of the strengthening structure of an embodiment of the present invention;

[0031] Figure 5 It is a partial cross-sectional structure schematic diagram of an embodiment of the present invention;

[0032] Figure 6 It is a three-dimensional structure schematic diagram of the installation of the outer strengthening block of an embodiment of the present invention;

[0033] Figure 7 It is a partial three-dimensional structure schematic diagram of the outer strengthening structure of an embodiment of the present invention;

[0034] Figure 8 It is the mechanical property simulation result of the corrugated sandwich beam and the PMI sandwich beam.

[0035] Reference Signs

[0036] 1. Outer tube; 2. Inner tube; 3. Corrugated core; 4. Outer strengthening structure; 41. Outer strengthening block; 42. Outer strengthening belt; 43. Outer thickening strip; 44. Installation groove; 5. Inner strengthening structure; 51. Inner strengthening block; 52. Inner strengthening belt; 53. Inner thickening strip. Detailed Embodiments

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0039] As Figure 1 、 Figure 2 、 Figure 3 shown. A high-strength corrugated core thin-walled sandwich tube beam includes a cylindrical corrugated core 3. A number of columns of trapezoidal cavities are uniformly arranged on the inner surface and the outer surface of the corrugated core 3. Here, the trapezoidal cavities are trapezoid-like cavities. The bottom surface and the top surface of the trapezoidal cavities are both arc surfaces. Since the width of the trapezoidal cavities is relatively small, the top surface and the bottom surface of the trapezoidal cavities seem to be flat surfaces, so they are described as trapezoidal cavities. An outer tube 1 is arranged on the outer surface of the corrugated core 3, and an inner tube 2 is arranged on the inner surface of the corrugated core 3. The corrugated core 3 is arranged between the inner tube 2 and the outer tube 1 to form a thin-walled sandwich structure. The main strength and stiffness directions of the corrugated core 3 are parallel to the axial direction of the tube beam. Therefore, the tube beam has a very high bending load-bearing efficiency and at the same time combines the advantages of the sandwich structure in terms of anti-instability and strong bending stiffness. The corrugated core 3, the inner tube 2, and the outer tube 1 are made of the same high specific modulus composite material.

[0040] Reinforcing structures are arranged on the corrugated core 3, and the reinforcing structures are linearly arrayed along the length direction of the corrugated core 3. The reinforcing structures include an outer reinforcing structure 4 and an inner reinforcing structure 5, and the outer reinforcing structure 4 and the inner reinforcing structure 5 are symmetrically arranged on the inner and outer sides of the corrugated core 3.

[0041] As Figure 4 、 Figure 6 、 Figure 7As shown in the figure. The external reinforcement structure 4 is arranged between the corrugated core 3 and the outer tube 1. The external reinforcement structure 4 includes external reinforcement blocks 41, and the external reinforcement blocks 41 are adapted to the trapezoidal cavities on the outer surface of the corrugated core 3. The external reinforcement blocks 41 are arranged in all the trapezoidal cavities on the outer surface of the corrugated core 3. The external reinforcement blocks 41 on the same external reinforcement structure 4 are arranged on the same cross-section of the corrugated core 3. The external reinforcement blocks 41 are trapezoidal structures. Here, the trapezoidal structure is similar to the trapezoidal cavity of the corrugated core 3, both of which are quasi-trapezoidal structures. The top and bottom surfaces of the external reinforcement blocks 41 are both arc surfaces, so that the external reinforcement blocks 41 are in full contact with the outer surface of the corrugated core 3 and the external reinforcement belt 42. The bottom and both sides of the external reinforcement blocks 41 are fixedly connected to the corrugated core 3.

[0042] An external reinforcement belt 42 is arranged outside the corrugated core 3, and the outer surface of the external reinforcement belt 42 is in full contact with and connected to the inner wall of the outer tube 1. The external reinforcement blocks 41 and the corrugated core 3 are alternately fixedly connected to the inner surface of the external reinforcement belt 42.

[0043] An internal reinforcement structure 5 is arranged between the corrugated core 3 and the inner tube 2. The internal reinforcement structure 5 includes internal reinforcement blocks 51, and the internal reinforcement blocks 51 are adapted to the trapezoidal cavities on the inner surface of the corrugated core 3. The internal reinforcement blocks 51 are arranged in the trapezoidal cavities on the inner surface of the corrugated core 3. The internal reinforcement blocks 51 and the external reinforcement blocks 41 are distributed at intervals on the cross-section of the corrugated core 3. The internal reinforcement blocks 51 on the same internal reinforcement structure 5 are arranged on the same cross-section of the corrugated core 3. The bottom and both sides of the internal reinforcement blocks 51 are fixedly connected to the corrugated core 3. An internal reinforcement belt 52 is arranged inside the corrugated core 3, and the inner surface of the internal reinforcement belt 52 is in full contact with and fixedly connected to the outer wall of the inner tube 2. The internal reinforcement blocks 51 and the corrugated core 3 are alternately fixedly connected to the outer surface of the internal reinforcement belt 52.

[0044] Both the external reinforcement blocks 41 and the internal reinforcement blocks 51 are fiber-reinforced composite materials, and the reinforcing fibers of the external reinforcement blocks 41 and the internal reinforcement blocks 51 are respectively arranged along the circumferential direction of the external reinforcement blocks 41 and the internal reinforcement blocks 51. Both the external reinforcement belt 42 and the internal reinforcement belt 52 are fiber-reinforced composite materials, and the reinforcing fibers of the external reinforcement belt 42 and the internal reinforcement belt 52 are both arranged along the circumferential direction of the pipe beam.

[0045] When the sizes of the external reinforcement blocks 41 and the internal reinforcement blocks 51 are small and the composite materials are not easy to be molded, the external reinforcement blocks 41 and the internal reinforcement blocks 51 can also be made of metal materials.

[0046] The internal reinforcement blocks 51 and the external reinforcement blocks 41 are embedded in the trapezoidal cavities of the corrugated core 3. An annular external reinforcement belt 42 is arranged outside the external reinforcement blocks 41, and an annular internal reinforcement belt 52 is arranged inside the internal reinforcement blocks 51. The reinforcement blocks and the reinforcement belts form an annular reinforcement in the circumferential direction of the pipe beam, which has the function of resisting corrugation crushing and overall flattening deformation of the pipe, and makes up for the deficiency of the out-of-plane stiffness of the corrugated structure.

[0047] As Figure 5As shown in the figure. An outer thickening strip 43 is provided between the corrugated core 3 and the outer tube 1, and the outer thickening strip 43 is arranged along the length direction of the corrugated core 3. An installation groove 44 through which the outer reinforcing strip 42 passes is provided on the outer thickening strip 43, and the width of the installation groove 44 is slightly larger than the width of the outer reinforcing strip 42. The outer surfaces of the outer thickening strip 43 and the outer reinforcing strip 42 are on the same circumference. The outer thickening strip 43 and the outer reinforcing block 41 are arranged at intervals on the outer surface of the corrugated core 3.

[0048] An inner thickening strip 53 is provided between the corrugated core 3 and the inner tube 2, and the inner thickening strip 53 is arranged along the length direction of the corrugated core 3. An installation groove 44 through which the inner reinforcing strip 52 passes is provided on the inner thickening strip 53, and the inner thickening strip 53 and the inner reinforcing block 51 are arranged at intervals on the inner surface of the corrugated core 3.

[0049] A thickening strip is provided between the corrugated core 3 and the inner tube 2 and the outer tube 1, and a strengthening area is formed on the corrugated core 3 to further improve the bending stiffness and anti-instability ability of the corrugated core 3.

[0050] Both the outer thickening strip 43 and the inner thickening strip 53 are fiber-reinforced composite materials, and the reinforcing fibers of the outer thickening strip 43 and the inner thickening strip 53 are arranged along the axial direction of the pipe beam.

[0051] The ratio of the spacing between the outer reinforcing strips 42 to the width of the outer reinforcing strip 42 is not less than 100.

[0052] The preparation method of the above high-strength corrugated core 3 thin-walled sandwich pipe beam includes the following steps:

[0053] S1. Cure the inner reinforcing strip 52 on the outer surface of the inner tube 2, cure the inner reinforcing block 51 on the outer surface of the inner reinforcing strip 52, and cure the inner thickening strip 53 on the outer surface of the inner tube 2. The inner thickening strip 53 is located between two adjacent inner reinforcing blocks 51.

[0054] S2. Sleeve the corrugated core 3 outside the inner tube 2. The inner reinforcing block 51 is located in the trapezoidal cavity on the inner surface of the corrugated core 3, and cure the corrugated core 3 with the inner thickening strip 53 and the inner reinforcing strip 52.

[0055] S3. Cure the outer reinforcing block 41 in the trapezoidal cavity on the outer surface of the corrugated core 3, cure the outer reinforcing strip 42 outside the outer reinforcing block 41, and cure the outer thickening strip 43 on the outer surface of the corrugated core 3. The outer thickening strip 43 and the outer reinforcing strip 42 are on the same cylindrical surface.

[0056] S4. Cure the outer tube 1 outside the outer reinforcing strip 42 and the outer thickening strip 43.

[0057] The mechanical properties of the high-strength corrugated core 3 thin-walled sandwich tube beam of the present invention are simulated and compared with the existing PMI sandwich beam. The high-strength corrugated core 3 thin-walled sandwich tube beam of the present invention is simply referred to as the corrugated sandwich beam. The outer diameters of both the corrugated sandwich beam and the PMI sandwich beam are 150 mm, and the lengths are both 1000 mm.

[0058] The design parameters of the PMI sandwich beam are shown in Table 1, and the design parameters of the corrugated sandwich beam are shown in Table 2. The inner tube 2, outer tube 1, corrugated core 3, strengthening blocks, strengthening bands, and thickening strips of the corrugated sandwich beam are all laid with carbon fiber composite material single-layer plates, and the performance parameters of the carbon fiber composite material single-layer plates are shown in Table 3.

[0059] Table 1 Design parameters of the PMI sandwich beam

[0060] ;

[0061] Table 2 Design parameters of the corrugated sandwich beam

[0062] ;

[0063] Table 3 Performance parameters of the carbon fiber composite material single-layer plates

[0064] ;

[0065] The mechanical property simulation results of the corrugated sandwich beam and the PMI sandwich beam are as Figure 8 shown. The rotation angles and bending moments of material failure and global instability of the corrugated sandwich beam and the PMI sandwich beam are shown in Table 4, and the material failure is analyzed based on the Tsai-Wu failure criterion.

[0066] Table 4 Rotation angles and bending moments of the corrugated sandwich beam and the PMI sandwich beam

[0067] ;

[0068] From Figure 8 and Table 3, it can be seen that the high-strength corrugated core 3 thin-walled sandwich tube beam of the present invention has a higher bending moment and a smaller rotation angle, indicating that the high-strength corrugated core 3 thin-walled sandwich tube beam of the present invention has better bending resistance and structural stability.

[0069] Therefore, by adopting the high-strength corrugated core thin-walled sandwich tube beam of the present invention and its preparation method, by arranging an axial corrugated core in the thin-walled sandwich of the tube beam, the axial stiffness and strength of the tube beam are improved, and the bending bearing efficiency and structural stability of the tube beam are improved; strengthening blocks and strengthening bands distributed in a ring shape are arranged outside and inside the corrugated core to improve the stiffness of the structural surface of the tube beam.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-strength corrugated core thin-walled sandwich tube beam, characterized in that: It comprises a cylindrical corrugated core, an outer tube is arranged on the outer surface of the corrugated core, an inner tube is arranged on the inner surface of the corrugated core, a reinforcing structure is arranged on the corrugated core, and the reinforcing structure is distributed in a linear array along the length direction of the corrugated core; the cross section of the corrugated core is a trapezoidal structure, the reinforcing structure comprises a reinforcing block embedded in the trapezoidal cavity of the corrugated core, an annular reinforcing belt is arranged outside the reinforcing block, and the reinforcing belt is connected to the corrugated core; The reinforcement structure includes an external reinforcement structure and an internal reinforcement structure. The external reinforcement structure is arranged between the corrugated core and the outer tube. The external reinforcement structure includes an external reinforcement block. The external reinforcement block is arranged in a trapezoidal cavity on the outer surface of the corrugated core. The external reinforcement blocks on the same external reinforcement structure are arranged on the same cross section of the corrugated core. The bottom and both sides of the external reinforcement block are fixedly connected to the corrugated core. An external reinforcement belt is arranged outside the corrugated core. The outer surface of the external reinforcement belt is connected to the inner wall of the outer tube. The external reinforcement block and the corrugated core are alternately connected to the inner surface of the external reinforcement belt. The inner reinforcement structure is arranged between the corrugated core and the inner tube, and the inner reinforcement structure includes an inner reinforcement block, which is arranged in a trapezoidal cavity on the inner surface of the corrugated core, and the inner reinforcement block and the outer reinforcement block are spaced apart on the cross section of the corrugated core; the inner reinforcement blocks on the same inner reinforcement structure are arranged on the same cross section of the corrugated core, the bottom and both sides of the inner reinforcement block are fixedly connected to the corrugated core, an inner reinforcement belt is arranged inside the corrugated core, the inner surface of the inner reinforcement belt is connected to the outer wall of the inner tube, and the inner reinforcement block and the corrugated core are alternately connected to the outer surface of the inner reinforcement belt; The outer reinforcement block is adapted to the trapezoidal cavity on the outer surface of the corrugated core, and the inner reinforcement block is adapted to the trapezoidal cavity on the inner surface of the corrugated core; the outer reinforcement block and the inner reinforcement block are both fiber-reinforced composite materials, and the reinforcing fibers of the outer reinforcement block and the inner reinforcement block are respectively arranged along the circumferential direction of the outer reinforcement block and the inner reinforcement block; The outer reinforcement belt and the inner reinforcement belt are both made of fiber-reinforced composite materials, and the reinforcing fibers of the outer reinforcement belt and the inner reinforcement belt are arranged along the circumference of the tube beam.

2. A high-strength corrugated core thin-walled sandwich tube beam according to claim 1, characterized in that: The corrugated core, the inner tube and the outer tube are high specific modulus composite materials.

3. The high-strength corrugated core thin-walled sandwich tube beam according to claim 1, characterized in that: An outer thickening strip is arranged between the corrugated core and the outer tube, the outer thickening strip is arranged along the length direction of the corrugated core, and an installation groove is arranged on the outer thickening strip for the outer reinforcement belt to pass through. The outer thickening strip and the outer reinforcement block are arranged at intervals on the outer surface of the corrugated core; an inner thickening strip is arranged between the corrugated core and the inner tube, the inner thickening strip is arranged along the length direction of the corrugated core, and an installation groove is arranged on the inner thickening strip for the inner reinforcement belt to pass through. The inner thickening strip and the inner reinforcement block are arranged at intervals on the inner surface of the corrugated core.

4. A high-strength corrugated core thin-walled sandwich tube beam according to claim 3, characterized in that: The outer thickening strip and the inner thickening strip are both made of fiber-reinforced composite materials, and the reinforcing fibers of the outer thickening strip and the inner thickening strip are arranged along the axial direction of the tube beam.

5. The high-strength corrugated core thin-walled sandwich tube beam according to claim 1, characterized in that: The ratio of the spacing between the outer reinforcement strips to the width of the outer reinforcement strips is not less than 100.

6. A method for preparing a high-strength corrugated core thin-walled sandwich tube beam according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Solidify the inner reinforcement belt on the outer surface of the inner tube, solidify the inner reinforcement block on the outer surface of the inner reinforcement belt, solidify the inner thickening strip on the outer surface of the inner tube, and the inner thickening strip is located between two adjacent inner reinforcement blocks; S2, the corrugated core is sleeved on the outside of the inner tube, the inner reinforcement block is located in the trapezoidal cavity on the inner surface of the corrugated core, and the corrugated core, the inner thickening strip and the inner reinforcement belt are solidified; S3, solidifying the external reinforcement block in the trapezoidal cavity on the outer surface of the corrugated core, solidifying the external reinforcement belt on the outside of the external reinforcement block, and solidifying the external thickening strip on the outer surface of the corrugated core, wherein the external thickening strip and the external reinforcement belt are on the same cylindrical surface; S4. The outer tube is solidified on the outside of the outer reinforcement belt and the outer thickening strip; the outer tube is paved with a single-layer plate of carbon fiber composite material.

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