Composite material corrugated curved wall honeycomb structure and preparation method thereof

Abstract

The invention discloses a composite material corrugated curved wall honeycomb structure and a preparation method thereof, and belongs to the technical field of lightweight composite material structures. The structure is formed by arranging a plurality of honeycomb units in a staggered mode, the wall face of each honeycomb unit is of a geometrical structure that outwards-protruding arc walls and inwards-concave arc walls are alternately distributed, the central angle theta of each arc wall is (0, 85), and the out-plane compression resistance and buckling resistance are remarkably improved through the corrugated curved wall design. The preparation method comprises the steps of prepreg laminated plate hot-pressing softening, corrugated mold array assembling, curved surface winding forming, segmented variable-temperature curing and the like, a process system combining a polytetrafluoroethylene detachable mold and a self-adaptive adjustable clamp is adopted, and the problem of interface weakening caused by interlocking or glue joint in a traditional process is solved. In the curing process, residual stress distribution is optimized through a two-stage process of pre-tightening forming and high-temperature strengthening. The composite material has high specific strength and process flexibility, and is suitable for high-bearing and light-weight requirements in the fields of aerospace, ships, new energy automobiles and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of lightweight composite material structures, and particularly relates to a composite material corrugated curved wall honeycomb structure and a preparation method thereof. Background Art

[0002] With the rapid development of the global economy and increasingly stringent environmental protection requirements, lightweight design has become a core demand in the fields of shipbuilding, aerospace, etc. Honeycomb sandwich structures are widely used in engineering structures due to their light weight, high load-bearing capacity, and excellent thermodynamic and acoustic properties. However, traditional hexagonal honeycomb structures have problems such as high in-plane stiffness, poor bending performance, and complex preparation processes. Especially when subjected to out-of-plane compression and bending loads, buckling failure is prone to occur.

[0003] With the continuous development of material technology, especially the development of composite materials, the mechanical properties of honeycomb structures have also been improved accordingly. Composite honeycomb structures mainly include aramid honeycombs, glass fiber honeycombs and carbon fiber honeycombs. Among them, aramid honeycombs have been widely used in the aerospace field due to their light weight, easy molding and low cost. However, their mechanical properties are relatively weak and cannot meet some engineering requirements. Carbon fiber composite honeycombs have low density, high strength and height, and are expected to play a greater role in more fields. However, due to the existing preparation process level, high-performance composite honeycomb structures such as carbon fiber have certain limitations in engineering applications.

[0004] At present, there are three main ways to use prepreg to prepare composite honeycombs:

[0005] Molding process: Place the cut prepreg on the mold, then buckle the other half of the mold, heat and solidify it. This method has small material loss and stable mechanical properties, but it has a long production cycle, high cost, low efficiency, and limited structural shapes that can be produced, so it is not suitable for mass production of large products.

[0006] Interlocking assembly process: The composite honeycomb is prepared by slotting the laminate formed by composite prepreg at the specified position and then interlocking and assembling them together. This method is low-cost and simple to operate, but the prefabricated slots will cut the fibers, introduce defects, and the structural performance will be affected to a certain extent.

[0007] Stretching process: When laying the laminate, place an isolation layer at the specified position between the prepreg layers, and then use a stretching machine to stretch the laminate at the specified position. This method does not require additional adhesives and can reduce the weight of the honeycomb, but it is difficult to control the uniformity of the cell wall and wall thickness.

[0008] In addition, the preparation processes of composite material honeycombs also include: 3D printing process, which can produce honeycombs with complex designs, but has a slow printing speed and high costs; the RTM process is highly dependent on molds, and different configurations and sizes require different molds, resulting in high costs and being not conducive to practical engineering applications.

[0009] Therefore, providing a composite material honeycomb structure with strong anti-buckling ability and easy to prepare has become an urgent problem to be solved at present. Summary of the Invention

[0010] The purpose of the present invention is to provide a composite material corrugated curved-wall honeycomb sandwich structure and its preparation process. Different from other composite material honeycomb structures and preparation processes, the present invention optimizes the geometric shape of the honeycomb wall to improve its anti-buckling ability and further enhance its out-of-plane compressive performance. Combining with an efficient winding molding process, it simplifies the preparation process, saves costs, is easy to achieve batch production, and achieves the goals of structural lightweight, high strength, and easy forming, meeting the engineering requirements in fields such as ships, aerospace, etc.

[0011] The present invention provides a composite material corrugated curved-wall honeycomb structure, which is composed of a plurality of honeycomb units arranged staggeredly; the honeycomb units are designed with corrugated curved walls; the honeycomb units are closed structures composed of outer convex circular arc walls connecting inner concave circular arc walls on the side wall surfaces; the honeycomb units are arranged staggeredly such that the inner concave circular arc walls on the side wall surfaces of the honeycomb units are spliced with the outer convex circular arc walls of the honeycomb units.

[0012] Further, the central angle θ of the outer convex circular arc wall of the honeycomb unit is (0, 85]; the chord length L of the outer convex circular arc wall of the honeycomb unit, the central angle θ, and the outer diameter R1 of the outer convex circular arc wall satisfy the following relationship:

[0013] L = 2R1 sinθ

[0014] Wherein, R1 ≥ 8 mm.

[0015] Further, the thickness D between the inner concave circular arc walls of the honeycomb unit, the chord length L of the outer convex circular arc wall, the central angle θ, and the outer diameter R1 of the outer convex circular arc wall satisfy the following relationship:

[0016]

[0017] The present invention also provides a forming preparation method for a composite material corrugated curved-wall honeycomb structure, including:

[0018] Step 1: Cut the prepreg according to the size design;

[0019] Step 2: Lay the cut prepregs layer by layer in a laying manner to form a laminate strip, and place it on a heating table to soften it;

[0020] Step 3: Wind the softened laminate strip in step 2 around the surface of the corrugated curved-wall honeycomb-shaped mold along a path to form a honeycomb structure, and sequentially place the honeycomb structure units in a fixture;

[0021] Step 4: Fasten and heat the fixture for curing; demold after cooling to obtain a composite corrugated curved-wall honeycomb structure.

[0022] Furthermore, the prepreg is one or more of carbon fiber, glass fiber, and aramid fiber.

[0023] Furthermore, the corrugated curved-wall honeycomb-shaped mold is a solid structure composed of an outwardly convex arc wall connecting an inwardly concave arc wall on the side wall; the material of the corrugated curved-wall honeycomb-shaped mold is a high-temperature resistant and relatively soft material; the mold material is preferably polytetrafluoroethylene.

[0024] Furthermore, the edge of the fixture is in the shape of a corrugated curved wall; the fixture is a quadrilateral structure, and a pair of adjacent sides of the quadrilateral structure are fixedly connected and integrally formed; in the quadrilateral structure of the fixture, one pair of opposite sides is a solid structure, and the other pair of opposite sides is a hollow structure in the middle; the solid structure opposite sides are embedded in the hollow structure of the other pair of opposite sides; the thickness of the solid structure opposite sides is half of the axial height of the corrugated curved-wall honeycomb-shaped mold; the total thickness of the opposite sides of the middle hollow structure is equal to the axial height of the corrugated curved-wall honeycomb-shaped mold.

[0025] Furthermore, a circle of corrugated curved-wall honeycomb-shaped molds is arranged on the outermost layer inside the fixture to prevent indentations from being formed on the outermost honeycomb wall during the curing extrusion of the composite material preparation.

[0026] Furthermore, the winding route is cross winding; after winding, the outermost layer of the honeycomb structure unit is a single-layer honeycomb wall structure, and the inside of the honeycomb structure unit is a single-layer honeycomb wall structure or a double-layer honeycomb wall structure.

[0027] Furthermore, the curing undergoes two heating processes; the first curing is to heat and cure at 70-90°C for 30-60 minutes; then adjust the fixture and fasten it again, and the second curing temperature is greater than 120°C and heat and cure for 100-120 minutes.

[0028] The beneficial effects of the present invention are as follows:

[0029] The corrugated curved-wall honeycomb structure of the present invention converts the straight wall into a curved wall, moves the neutral axis away from the cross-section, increases the cross-sectional moment of inertia, thereby improving the buckling resistance of the thin-walled honeycomb, enhancing the out-of-plane compressive strength of the honeycomb, with the strength increased to 68.04 and the specific strength increased to 448.48; compared with the molding method, the winding method of the present invention has a single and clear position of the single-layer honeycomb wall thickness, the number is much lower than the latter, and the performance is better; the preparation process of the present invention does not require the additional use of adhesives, which reduces the structural mass to a certain extent, is simple in operation and low in cost, and has broad application prospects in the future. Brief Description of the Drawings

[0030] Figure 1 Schematic diagram of the corrugated curved-wall honeycomb unit cell of the present invention;

[0031] Figure 2 Schematic diagram of the corrugated curved-wall honeycomb-shaped mold adopted by the present invention;

[0032] Figure 3 Schematic diagram of the fixture adopted by the present invention;

[0033] Figure 4 Schematic diagram of the prepreg winding path of Embodiment 1 of the present invention;

[0034] Figure 5 Schematic diagram of the prepreg winding path of Embodiment 2 of the present invention;

[0035] Figure 6 Schematic diagram of the corrugated curved-wall honeycomb structure of the present invention. Detailed Description of the Invention

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] The present invention discloses a composite material corrugated curved-wall honeycomb structure, which is composed of a plurality of honeycomb units arranged in a staggered manner. The cell wall surface of the honeycomb unit is designed as a corrugated curved wall, specifically, an outwardly convex circular arc wall and an inwardly concave circular arc wall are arranged alternately; the honeycomb unit is as Figure 1 shown, R1 is the outer diameter of the corrugated curved-wall honeycomb cell, R2 is the inner diameter of the corrugated curved-wall honeycomb cell, θ is the central angle of the corrugated curved-wall honeycomb, and the bending degree can be controlled, and the value range is (0, 85], t1 is the thickness of a single-layer prepreg, t2 is the total thickness of multiple-layer prepregs, and L is the side length of the conventional square honeycomb corresponding to the corrugated curved-wall honeycomb; among them, the range of the central angle is (0, 85]; the relationship between the chord length outer diameter and the central angle is L = 2R1 sinθ; for the convenience of production, the minimum outer diameter of the circular arc wall is 8 mm; the composite material can be one or more composite materials such as carbon fiber, glass fiber, and aramid fiber.

[0038] The present invention also discloses a preparation method for a composite material corrugated curved-wall honeycomb structure, and the steps are as follows:

[0039] (1) Cutting of materials: Cut the prepreg according to the designed size.

[0040] (2) Preparation of the laminate strip: Lay the prepregs cut in the previous step together according to the required layup method to form a laminate strip, and place it on a heating table to soften it for subsequent winding.

[0041] (3) Pretreatment of the fixture: Place a corrugated curved-wall honeycomb-shaped mold in the outermost layer inside the fixture; the corrugated curved-wall honeycomb-shaped mold is asFigure 2 As shown, R2 is the inner diameter of the corrugated curved-wall honeycomb, and H is the axial height of the corrugated curved-wall honeycomb. The material of the corrugated curved-wall honeycomb mold is a high-temperature resistant and relatively soft material such as polytetrafluoroethylene.

[0042] The edge of the fixture is in the form of a corrugated curved wall. Among them, a pair of adjacent sides are fixedly connected and integrally formed, and cannot move relative to each other. The other pair of adjacent sides are made separately and are not fixedly connected. The thickness direction of one group of opposite sides is designed with a hollow in the middle, and the hollow thickness is half of the total thickness. The hollow thickness is the total thickness of the other group of opposite sides. In this way, after the separately made adjacent-side fixture and the fixedly connected adjacent-side fixture are assembled, they can move freely in the hollow space in the vertical or horizontal direction. Because the fixture has two adjacent sides that can move freely, it can produce at least a single corrugated curved-wall honeycomb cell and at most a honeycomb structure with the number of corrugations on the fixture edge. The bending radius of the honeycomb wall of the corrugated curved-wall honeycomb mold should be slightly smaller than the bending radius of the fixture edge, leaving the thickness of the prepreg. The fixture is as Figure 3 shown. t2 is the thickness of the gap between the edge mold and the fixture edge. This gap is the total thickness of the reserved prepreg laminate. The edge gap can be filled with a release cloth or other materials that do not affect curing. H is the total thickness of the fixture, and h is the thickness of one free edge of the fixture and the thickness of the hollow of the other free edge. h = 1 / 2H;

[0043] Placing a circle of corrugated curved-wall honeycomb-shaped molds on the outermost layer inside the fixture can avoid forming indentations on the outermost honeycomb wall during the curing extrusion of specimen preparation.

[0044] (4) Winding treatment: Wind the softened prepreg in step (2) along a certain path around the corrugated curved-wall honeycomb-shaped mold. The winding path can wind out two rows of honeycomb structures at one time. Wind two rows of honeycomb structures again in the same way, and then fit them under the honeycomb structure wound for the first time. Repeat this step until the requirement is met. Place the wound two rows of honeycomb structures in the fixture in sequence, fit them with the mold placed in step (3), and fix the fixture.

[0045] (5) Curing step: Place the fixture and the honeycomb structure wound in step (4) together in an oven for heating and curing; the curing process is as follows: First, put the corrugated curved-wall honeycomb fixed by the fixture into the oven, set the heating parameters to 70 - 90 °C for heating and curing for 30 - 60 minutes, then adjust the fixture, tighten it again, and then put it into the oven for heating and curing at a minimum of 120 °C for 100 - 120 minutes. Finally, cool it down to room temperature, and the curing process is completed.

[0046] (6) Demolding step: Remove the corrugated curved-wall honeycomb-shaped mold from the honeycomb structure to obtain the composite corrugated curved-wall honeycomb structure.

[0047] Example 1

[0048] A unit cell of a composite material corrugated curved-wall honeycomb structure, where R1 = 12 mm, R2 = 11.5 mm, t1 = 0.1 mm, t2 = 0.5 mm, θ = 60°, L = 20.78 mm; the prepreg is a carbon fiber composite prepreg. Prepare a corrugated curved-wall honeycomb structure with 4 transverse honeycomb unit cells (M = 4) and 4 longitudinal honeycomb unit cells (N = 4). The molds required for preparation are as Figure 2 shown. The mold material is polytetrafluoroethylene, and the fixture material is mold steel.

[0049] The preparation method includes the following steps:

[0050] (1) Cutting of materials: Cut the carbon fiber prepreg into strips with a width H = 20 mm according to the pre-designed dimensions.

[0051] (2) Preparation of the laminated strip: Lay the carbon fiber prepreg strips cut in the previous step together according to the pre-designed [02 / 90 / 02] layup pattern, squeeze out the air bubbles to form a laminated strip, and place it on a heating table to heat and soften it for easier winding.

[0052] (3) Pretreatment of the fixture: For the fixture as Figure 3 shown, move the lower and right free edges of the fixture respectively to make it in the form of 6*6, fix it with screws and nuts, and place a total of 20 molds in a circle on the outermost layer. The gaps between the outermost molds and the fixture edge are filled with release cloth, and the filling thickness is the total thickness of the laminate in step (2), i.e., t2 = 0.5 mm. Placing the molds on the outermost layer is to prevent indentations from forming on the outermost honeycomb wall during the curing extrusion of the specimen preparation.

[0053] (4) Winding treatment: Wind the softened prepreg laminated strip from step (2) around the corrugated curved-wall honeycomb-shaped mold as Figure 4 shown. A is the winding starting point and B is the winding ending point. Wind two rows at a time, and after winding 2 times for a total of 4 rows, assemble the structure and place it in the fixture in sequence to fit with the outermost corrugated curved-wall honeycomb-shaped mold placed in step (3). After the winding and assembly are completed, use screws and nuts to fix the fixture again to make the unit cell molds in close contact.

[0054] (5) Curing step: First, put the corrugated curved-wall honeycomb structure fixed by the fixture into the oven, set the heating parameters to 90 °C for heating and curing for 60 minutes, then adjust the fixture, tighten it again, and then put it into the oven for heating and curing at 120 °C for 120 minutes. Finally, cool it down to room temperature to complete the curing process.

[0055] (6) Demolding step: Disassemble the fixture, and demold the corrugated curved-wall honeycomb-shaped molds in the honeycomb structure one by one to obtain a carbon fiber corrugated curved-wall honeycomb structure with 4*4 cell elements, as Figure 6 shown, and its performance is shown in Table 1.

[0056] Example 2

[0057] The difference from Example 1 lies in the winding process in step (4):

[0058] Lay the prepreg laminate strip softened in step (2) around a corrugated curved wall honeycomb-shaped mold as shown. A is the starting point of winding and B is the ending point of winding. Wind 4 honeycomb units at one time. Assemble the wound honeycomb structure and place it in the fixture in sequence, making it fit with the outermost corrugated curved wall honeycomb-shaped mold placed in step (3). After winding and assembly are completed, use screws and nuts to fix the fixture again to make the single-cell mold contact tightly; Figure 5

[0059] The remaining steps and parameters are the same as those in Example 1. Prepare a corrugated curved wall honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4).

[0060] Example 3

[0061] The difference from Example 1 lies in a single cell of a composite material corrugated curved wall honeycomb structure, where R1 = 8 mm, R2 = 7.5 mm, t1 = 0.1 mm, t2 = 0.5 mm, θ = 60°, and L = 13.9 mm; the remaining steps and parameters are the same as those in Example 1. Prepare a corrugated curved wall honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4), and its performance is shown in Table 1.

[0062] Example 4

[0063] The difference from Example 1 lies in a single cell of a composite material corrugated curved wall honeycomb structure, where R1 = 9 mm, R2 = 8.5 mm, t1 = 0.1 mm, t2 = 0.5 mm, θ = 60°, and L = 15.9 mm; the remaining steps and parameters are the same as those in Example 1. Prepare a corrugated curved wall honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4), and its performance is shown in Table 1.

[0064] Example 5

[0065] The difference from Example 1 lies in a single cell of a composite material corrugated curved wall honeycomb structure, where R1 = 10 mm, R2 = 9.5 mm, t1 = 0.1 mm, t2 = 0.5 mm, θ = 60°, and L = 17.3 mm; the remaining steps and parameters are the same as those in Example 1. Prepare a corrugated curved wall honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4), and its performance is shown in Table 1.

[0066] Example 6

[0067] ​The difference from Example 1 lies in a single cell of a composite material corrugated curved-wall honeycomb structure, where R1 = 11 mm, R2 = 10.5 mm, t1 = 0.1 mm, t2 = 0.5 mm, θ = 60°, and L = 19.1 mm; the remaining steps and parameters are the same as those in Example 1. A corrugated curved-wall honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4) is prepared, and its performance is shown in Table 1.

[0068] Comparative Example 1

[0069] A single cell of a square honeycomb structure, L = 20.8 mm, t2 = 0.5 mm; the prepreg is a carbon fiber composite prepreg. A square honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4) is prepared. The mold material is polytetrafluoroethylene, and the fixture material is die steel.

[0070] The preparation method includes the following steps:

[0071] (1) Cutting of materials: Cut the carbon fiber prepreg into strips with a width H = 20 mm according to the pre-designed dimensions.

[0072] (2) Preparation of laminated strips: Lay the cut carbon fiber prepreg strips together in the pre-designed [02 / 90 / 02] lay-up pattern, squeeze out the air bubbles to form laminated strips, and place them on a heating table to heat and soften them for easier winding; wind the laminated strips around the square honeycomb mold.

[0073] (3) Curing step: First, place the square honeycomb structure fixed by the fixture into an oven, set the heating parameters to 90 °C for 60 minutes of heating and curing, then adjust the fixture and tighten it again, and then place it in the oven for 120 °C for 120 minutes of heating and curing, and finally cool it down to room temperature to complete the curing process.

[0074] (4) Demolding step: Remove the fixture, and then demold the square honeycomb shape mold in the honeycomb structure one by one to obtain a square honeycomb structure with a cell number of 4*4, and its performance is shown in Table 1.

[0075] Comparative Example 2

[0076] The difference from Comparative Example 1 lies in a single cell of a square honeycomb structure, L = 13.9 mm, t2 = 0.5 mm; the remaining steps are the same as those in Comparative Example 1. A square honeycomb structure with 4 transverse honeycomb single cells (M = 4) and 4 longitudinal honeycomb single cells (N = 4) is prepared, and its performance is shown in Table 1.

[0077] Comparative Example 3

[0078] The difference from Comparative Example 1 lies in a single cell of a square honeycomb structure with L = 15.9 mm and t2 = 0.5 mm; the remaining steps are the same as those in Comparative Example 1. A square honeycomb structure with the number of transverse honeycomb cells M being 4 and the number of longitudinal honeycomb cells N being 4 is prepared, and its performance is shown in Table 1.

[0079] Comparative Example 4

[0080] The difference from Comparative Example 1 lies in a single cell of a square honeycomb structure with L = 17.3 mm and t2 = 0.5 mm; the remaining steps are the same as those in Comparative Example 1. A square honeycomb structure with the number of transverse honeycomb cells M being 4 and the number of longitudinal honeycomb cells N being 4 is prepared, and its performance is shown in Table 1.

[0081] Comparative Example 5

[0082] The difference from Comparative Example 1 lies in a single cell of a square honeycomb structure with L = 19.1 mm and t2 = 0.5 mm; the remaining steps are the same as those in Comparative Example 1. A square honeycomb structure with the number of transverse honeycomb cells M being 4 and the number of longitudinal honeycomb cells N being 4 is prepared, and its performance is shown in Table 1.

[0083] As shown in Table 1, when the corresponding chord lengths are equal for the examples and comparative examples, the comparison data of the performance between the corrugated curved-wall honeycomb structure and the square honeycomb are presented.

[0084] Table 1 shows the comparison data of the performance between the corrugated curved-wall honeycomb and the square honeycomb

[0085]

[0086] In summary, due to the curved-wall treatment, the buckling resistance of the corrugated curved-wall honeycomb structure of the present invention is improved, so it has a higher compressive strength; the preparation process of the present invention does not require the additional use of adhesives, which reduces the structural mass to a certain extent, is simple to operate, has low costs, and has broad application prospects in the future.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A corrugated curved wall honeycomb structure of a composite material, characterized in that, The structure is composed of a number of honeycomb units arranged in a staggered manner; the honeycomb units are designed with corrugated curved walls; the honeycomb units are closed structures composed of outward convex circular arc walls connecting inward concave circular arc walls on the side wall surfaces; the honeycomb units are arranged in a staggered manner such that the inward concave circular arc walls on the side wall surfaces of the honeycomb units are spliced with the outward convex circular arc walls of the honeycomb units.

2. The corrugated curved wall honeycomb structure of a composite material according to claim 1, wherein The central angle θ of the outward convex circular arc wall of the honeycomb unit is in the range of (0, 85]; the chord length L of the outward convex circular arc wall of the honeycomb unit, the central angle θ, and the outer diameter R1 of the outward convex circular arc wall satisfy the following relationship: L = 2R1 sinθ where R1 ≥ 8 mm.

3. A composite material corrugated curved wall honeycomb structure according to claim 1, characterized in that, The thickness D between the inward concave circular arc walls of the honeycomb unit, the chord length L of the outward convex circular arc wall, the central angle θ, and the outer diameter R1 of the outward convex circular arc wall satisfy the following relationship:

4. A method for forming and preparing a composite material corrugated curved wall honeycomb structure as described in claim 1, characterized in that, Including: Step 1: Cut the prepreg according to the dimension design. Step 2: Stack the cut prepregs layer by layer in a laying manner to form a laminated strip, and place it on a heating table to soften it. Step 3: Wind the softened laminated strip in Step 2 around the surface of a corrugated curved wall honeycomb-shaped mold along a path to form a honeycomb structure unit, and place the honeycomb structure units in a fixture in sequence. Step 4: Fasten and heat-cure the fixture. After cooling, demold to obtain a composite material corrugated curved wall honeycomb structure.

5. The forming preparation method of the composite material corrugated curved wall honeycomb structure according to claim 4, characterized in that, The prepreg is one or more of carbon fiber, glass fiber, and aramid fiber.

6. The forming preparation method of the composite material corrugated curved wall honeycomb structure according to claim 4, characterized in that, The corrugated curved wall honeycomb-shaped mold is a solid structure composed of outward convex circular arc walls connecting inward concave circular arc walls on the side wall surfaces; the material of the corrugated curved wall honeycomb-shaped mold is a high-temperature resistant and relatively soft material; the mold material is preferably polytetrafluoroethylene.

7. The forming preparation method of the composite material corrugated curved wall honeycomb structure according to claim 4, characterized in that, The edge of the fixture is in the shape of a corrugated curved wall; the fixture is a quadrilateral structure, and a pair of adjacent sides of the quadrilateral structure are fixedly connected and integrally formed; in the quadrilateral structure of the fixture, one pair of opposite sides is a solid structure, and the other pair of opposite sides is a middle hollow structure; the solid structure opposite sides are embedded in the hollow structure of the other pair of opposite sides; the thickness of the solid structure opposite sides is half of the axial height of the corrugated curved wall honeycomb-shaped mold; the total thickness of the middle hollow structure opposite sides is equal to the axial height of the corrugated curved wall honeycomb-shaped mold.

8. The forming and preparation method of the composite material corrugated curved wall honeycomb structure according to claim 4, characterized in that, One circle of corrugated curved wall honeycomb-shaped molds is arranged on the outermost layer inside the fixture to avoid forming indentations on the outermost layer of honeycomb walls during the curing extrusion of the composite material preparation.

9. The forming preparation method of the composite material corrugated curved wall honeycomb structure according to claim 4, characterized in that, The winding route is cross winding; after winding, the outermost layer of the honeycomb structure unit is a single-layer honeycomb wall structure, and the inside of the honeycomb structure unit is a single-layer honeycomb wall structure or a double-layer honeycomb wall structure.

10. The forming and preparation method of the composite material corrugated curved wall honeycomb structure according to claim 4, characterized in that, The curing undergoes two heating processes; the first curing is to heat-cure at 70 - 90 °C for 30 - 60 min; then adjust the fixture and fasten it again, and the second curing temperature is greater than 120 °C and heat-cure for 100 - 120 min.

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