Carbon fiber hollow beam structure and application and laying method thereof

Abstract

The invention discloses a carbon fiber hollow beam structure and an application and layering method thereof. The carbon fiber hollow beam structure comprises a hollow pipe body, and the hollow pipe body comprises a first supporting wall arranged oppositely and a second supporting wall arranged oppositely; one end of the supporting wall extends away from the hollow pipe body to form a flange, and the outer side face of the flange and the outer side face of the second supporting wall are arranged in a coplanar mode. The middle parts of the supporting walls II which are oppositely arranged are inwards concave to form an inwards concave structure; the carbon fiber hollow beam structure can be paved and formed by combining an annular paving layer and a U-shaped paving layer with a surface paving layer; the carbon fiber hollow beam has the advantages that the comprehensive mechanical properties of the hollow beam in the aspects of high specific strength, high fatigue strength, high bending resistance, high deformation resistance and the like are effectively realized, the universality of the hollow beam is greatly improved by combining the characteristics of light weight and corrosion resistance of the carbon fiber material, and the carbon fiber hollow beam is particularly suitable for the fields of aerospace, rail transit, vehicles and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber hollow beam structure, application and layering method thereof. BACKGROUND

[0002] The hollow beam (also known as a tubular beam or a box beam) is a beam structure in which the material is distributed away from the neutral axis, which is suitable for fields with strict requirements on weight, stiffness, dynamic performance and space utilization, such as wing and fuselage structures in aerospace, train frames in rail transit, chassis frames of vehicles, and load-bearing frames in precision equipment.

[0003] In the prior art, the hollow beam is usually made of steel or aluminum, and the cross section is usually in a regular shape, such as a square, a circle or a sun-shaped section. The hollow beam with a square cross section has poor torsional resistance and is prone to local buckling. The hollow beam with a circular cross section has low bending resistance and low space utilization. The hollow beam with a sun-shaped cross section is heavy and has a complex process. The existing hollow beam has low universality and needs to be selected according to the weight, cost and performance.

[0004] Carbon fiber composite materials gradually replace aluminum alloy materials due to their light weight, high strength, corrosion resistance and other advantages, and are widely used in the fields of aerospace, automobiles and rail transit.

[0005] In the prior art, the components of carbon fiber composite materials are usually made of sandwich panels or winding forming structures. The forming structure cannot effectively guarantee the comprehensive performance of the hollow beam made of carbon fiber composite materials, and cannot guarantee the universality of the hollow beam. SUMMARY

[0006] To solve the above problems, the present application provides a carbon fiber hollow beam structure with reasonable structure, application and layering method, thereby effectively realizing and guaranteeing the comprehensive mechanical properties of the hollow beam in terms of high specific strength, high fatigue strength, high bending resistance and deformation resistance, and greatly improving the universality of the hollow beam in combination with the light weight and corrosion resistance of carbon fiber materials. The carbon fiber hollow beam structure is particularly suitable for use in the fields of aerospace, rail transit and vehicles.

[0007] The technical solutions adopted by the present application are as follows: A carbon fiber hollow beam structure includes a hollow tube body, the hollow tube body includes oppositely arranged support wall one and oppositely arranged support wall two; the end of the support wall one extends away from the hollow tube body to form a flange, the outer side surface of the flange is coplanar with the outer side surface of the support wall two; the middle part of the oppositely arranged support wall two is inwardly recessed to form an inner recess structure.

[0008] As a further improvement of the above technical solutions: The hollow pipe body is composed of oppositely arranged support wall one and oppositely arranged support wall two, and the flange is formed at the joint of the support wall one and the support wall two, and the support wall one and the two end flanges jointly form a U-shaped structure with the opening away from the hollow pipe body.

[0009] The inner recess structure is a U-shaped structure with the opening away from the hollow pipe body, and the opposite side walls of the inner recess structure are inclined surfaces constituting an outward opening; the corners of the inner recess structure and the joint of the inner recess structure and the support wall two are all provided with a rounded corner transition.

[0010] The inner side surface of the flange and the support wall one form a rounded corner two, and / or the thickness size of the flange is greater than the thickness size of the support wall two.

[0011] The hollow beam is composed of carbon fiber composite material layers, including spaced face layers, and annular layers are arranged between the middle parts of the spaced face layers, and U-shaped layers with outward openings are arranged between the face layers on the opposite sides of the annular layers; the annular layers and the U-shaped layers on the outer side surfaces and the face layers jointly form the hollow pipe body, the face layers and the annular layers are recessed in the middle part to form an inner recess structure, and the side surfaces of the U-shaped layers and the edges of the face layers jointly form a flange.

[0012] The joint of the annular layer, the face layer and the U-shaped layer forms a triangular hollow area, and the triangular hollow area is provided with a filler; the filler is filled along the length direction of the hollow beam by using a roll material.

[0013] A reinforcing layer is arranged on the inner side surface of the annular layer on the opposite side of the inner recess structure, and the arrangement direction of the reinforcing layer is along the length direction of the hollow beam.

[0014] The application of a carbon fiber hollow beam structure is applied to an aircraft wing, and the hollow beam is arranged between the upper and lower skins, and the flange and the support wall two of the hollow beam are arranged on the inner side of the skin.

[0015] A layering method of the carbon fiber hollow beam structure according to any one of the above technical solutions, the annular layer and the U-shaped layer are arranged, the U-shaped layer is arranged on the opposite outer side of the annular layer, and the two side layers are arranged on the opposite outer side of the U-shaped layer and the outer side of the annular layer.

[0016] As a further improvement of the above technical solutions: The U-shaped layer is uniformly laid in the 0°, 90°, 45° and -45° directions, or is laid in the 90°, 45° and -45° directions and the material proportion in the 90° direction is greater than that in the ±45° direction; the surface layer has a material proportion of 50% or more in the 0° or 90° direction; and the annular layer is laid in a way that the full annular layer is wrapped and the overlapping joints of adjacent layers are staggered.

[0017] Compared with the prior art, the present application has the following beneficial effects: The hollow beam can be made of carbon fiber composite material and is formed by annular layer, U-shaped layer and surface layer. The comprehensive mechanical properties of the hollow beam in high specific strength, high fatigue strength, high bending resistance and deformation resistance are effectively realized and ensured. The universal applicability of the hollow beam is greatly improved and guaranteed, especially in the fields of aerospace, rail transportation and vehicles. The present application also has the following advantages: The flange shared by the two outer sides of the hollow tube support wall is provided, which effectively increases the support surface of the hollow beam and is suitable for reliable assembly of the hollow beam with external objects such as pulleys and hanging parts. The inner recess structure is provided, which effectively improves the structural stiffness of the hollow beam, ensures the bending resistance and deformation resistance, and guarantees the stability of the overall structure of the hollow beam.

[0018] The U-shaped layer is provided, which effectively ensures the integrity and continuity of the U-shaped structure of the hollow beam away from the hollow tube, especially ensuring that the flange will not be torn under stress. The surface layer laid on the side of the annular layer is extended to the U-shaped layer, which effectively enhances the structural strength and stiffness of the hollow beam. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the hollow beam of the present application.

[0020] Figure 2 It is a stress schematic diagram of the hollow beam of the present application in one kind of use state.

[0021] Figure 3 It is a stress schematic diagram of the hollow beam of the present application in another use state.

[0022] Figure 4 It is a schematic diagram of the layer of the hollow beam filled with filling material of the present application.

[0023] Figure 5 It is a direction setting schematic diagram of the hollow beam of the present application when the layer is laid.

[0024] Figure 6This is a schematic diagram of the hollow beam in this invention applied to an airfoil.

[0025] Among them: 1. Hollow tube body; 2. Flanged edge; 3. Concave structure; 4. Rounded corner one; 5. Rounded corner two; 11. Supporting wall one; 12. Supporting wall two; 31. Inclined surface; 10. U-shaped layup; 20. Top layer; 30. Circular layup; 40. Reinforcing layup; 50. Filler; 100. Skin. Detailed Implementation

[0026] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] like Figure 1 As shown, a carbon fiber hollow beam structure of this embodiment includes a hollow tube 1. The hollow tube 1 includes a first support wall 11 and a second support wall 12 arranged opposite to each other. The end of the first support wall 11 extends away from the hollow tube 1 to form a flange 2. The outer side of the flange 2 is coplanar with the outer side of the second support wall 12. The middle of the second support wall 12 is concave towards each other to form a concave structure 3.

[0028] In this embodiment, the hollow beam includes a hollow tube 1, a flange 2 extending laterally from the hollow tube 1 to form a coplanar outer surface, and an inwardly recessed structure 3 located in the middle of the outer surface, which effectively realizes and ensures the comprehensive mechanical properties of the hollow beam in terms of high specific strength, high fatigue strength, and high resistance to bending and deformation.

[0029] In this embodiment, the flange 2, which is coplanar with the outer side of the support wall 12 of the hollow tube 1, effectively increases the support surface of the hollow beam, making it suitable for reliable assembly of the hollow beam with external objects such as pulleys and hangers.

[0030] The concave structure 3 effectively acts as a "reinforcing rib," enhancing the rigidity of the hollow beam structure, ensuring its resistance to bending and deformation, and guaranteeing the overall stability of the hollow beam structure.

[0031] The hollow tube 1 is formed by two opposing support walls 11 and 12. The flanges 2 are formed at the junction of the support walls 11 and 12. The support walls 11 and the flanges 2 at both ends together form a U-shaped structure with the opening facing away from the hollow tube 1, forming a hollow beam structure with a relatively regular cross section that is easy to assemble with external objects. The junction of the support walls 11 and 12 in the hollow tube 1 forms a rounded corner 4, which effectively reduces or even avoids stress concentration problems.

[0032] In this embodiment, the hollow tube 1 can also be configured with other structural forms as needed, as long as it can effectively ensure that the outer surface of the support wall 2 12 and the flange 2 are coplanar and together form a load-bearing support surface.

[0033] The inner recess structure 3 is a U-shaped structure with an opening facing away from the hollow beam body 1. The opposite side walls of the inner recess structure 3 are inclined surfaces 31, which constitute an outward opening. The inclined surfaces 31 can not only ensure the reliability of the structure of the inner recess structure 3, but also increase the draft angle. The corners of the inner recess structure 3 and the junctions between the inner recess structure 3 and the support wall two 12 are all provided with round corners to effectively avoid stress concentration at the corners and the junctions.

[0034] The hollow beam in the embodiment can be applied to different force bearing situations, such as Figure 2 The force bearing state of the hollow beam in the use state of hanging a load via the flange 2 is shown in the figure. As shown in the figure, Figure 3 The force bearing state of the hollow beam in the use state of the hollow beam being placed on the side and the upper and lower surfaces simultaneously bearing inward extrusion force is shown in the figure.

[0035] In one of the embodiments, the junction between the inner side surface of the flange 2 and the support wall one 11 constitutes a round corner two 5, and / or the thickness dimension of the flange 2 is greater than the thickness dimension of the support wall two 12.

[0036] The provision of the round corner two 5 between the inner side surface of the flange 2 and the support wall one 11 effectively avoids the occurrence of stress concentration at the corner, especially helps to reduce or even avoid stress concentration of the hollow beam under high-strength compression.

[0037] In the embodiment, by increasing the thickness of the flange 2, the supporting surface is increased via the flange 2, and the structural strength at the flange 2 is effectively enhanced.

[0038] As shown in Figure 2 and Figure 3 The hollow beam is made of carbon fiber composite material, which includes the surface layer 20 arranged at intervals, the annular layer 30 arranged between the intervals of the surface layer 20, and the U-shaped layer 10 arranged at the intervals of the surface layer 20 located on the opposite sides of the annular layer 30. The annular layer 30 and the U-shaped layer 10 on the outer side surface and the surface layer 20 together constitute the hollow beam body 1. The surface layer 20 and the annular layer 30 are recessed at the middle part to form the inner recess structure 3. The side surface of the U-shaped layer 10 and the edge of the surface layer 20 together constitute the flange 2.

[0039] The hollow beam in the embodiment can be made of carbon fiber composite material, which is realized by the annular layer 30, the U-shaped layer 10, and the surface layer 20. The carbon fiber material has the characteristics of light weight and corrosion resistance, and the hollow beam has high specific strength, high fatigue strength, high bending resistance, and deformation resistance.

[0040] In the embodiment, by adopting the U-shaped layer 10, the integrity and continuity of the U-shaped structure of the hollow beam away from the hollow tube 1 are effectively ensured, and in particular, the flange 2 is ensured not to be torn under stress state; by extending the surface layer 20 laid on the side surface of the annular layer 30 to the U-shaped layer 10, the structural strength and rigidity of the hollow beam are effectively enhanced.

[0041] The annular layer 30, the surface layer 20, and the U-shaped layer 10 meet to form a triangular hollow area, and the triangular hollow area is provided with a filler 50, as shown in Figure 4 The filler 50 is filled along the length direction of the hollow beam by using a roll material.

[0042] In the embodiment, the triangular hollow area is filled by the filler 50, which ensures the structural reliability of the joint.

[0043] The annular layer 30 is provided with a reinforcing layer 40 on the inner side surface of the annular layer 30 at the opposite side of the concave structure 3, and the laying direction of the reinforcing layer 40 is along the length direction of the hollow beam, that is, the 0° direction in Figure 5 .

[0044] In the embodiment, the load bearing support performance of the hollow beam along the length direction can be enhanced by the setting of the reinforcing layer 40, and the stress in each direction can be effectively transmitted.

[0045] The embodiment also provides a layering method of the carbon fiber hollow beam structure, and the annular layer 30 and the U-shaped layer 10 are laminated and formed, the U-shaped layer 10 is arranged on the opposite outer side of the annular layer 30 with the opening facing outward, and the two surface layers 20 are arranged on the opposite outer side of the U-shaped layer 10 and the outer side of the annular layer 30.

[0046] In the embodiment, the annular layer 30, the surface layer 20, and the U-shaped layer 10 are arranged to jointly layer the carbon fiber hollow beam structure, effectively combine the material characteristics of the carbon fiber, realize and ensure the comprehensive mechanical properties of the hollow beam, and improve and ensure the universality of the hollow beam in actual use.

[0047] In actual operation, the direction of the layer is also set, and the direction of the layer has a certain influence on the comprehensive stress of the hollow beam. In special cases, the mechanical bearing performance in some directions can also be improved according to the setting of the layer direction.

[0048] As shown in Figure 5 , the 0° direction along the length direction of the hollow beam is set, the 90° direction along the direction of the flange 2 on the cross section is set, the 0° is rotated by 45° in the opposite direction in the plane formed by the 0° and the 90° to form the 45° direction and the -45° direction.

[0049] The U-shaped layer 10 is evenly distributed and laid in the 0°, 90°, 45°, and -45° directions, or is laid in the 90°, 45°, and -45° directions and the material proportion in the 90° direction is greater than that in the ±45° direction.

[0050] In Figure 2 In the embodiment shown, the hollow beam carries the mounting of the object via the flange 2, and the U-shaped layer 10 can be evenly distributed and laid in the 0°, 90°, 45°, and -45° directions to enable the hollow beam to be enhanced in all directions.

[0051] In Figure 3 In the embodiment shown, the hollow beam is placed to bear the upward and downward forces, and while thickening the flange 2, the layer direction can also be adjusted accordingly, and the material proportion in the 90° direction is laid more than that in the ±45° direction, for example, the material proportion laid in the 90° direction is 60%, and the material proportion laid in the ±45° direction is 40%.

[0052] The surface layer 20 has a material proportion of 50% or more in the 0° or 90° direction.

[0053] In actual use, the laying direction of the surface layer 20 can be combined to further improve the stress bearing performance of the hollow beam in the preset direction; if the hollow beam is biased to need to protect the stress intensity in the straight direction of the length, the material proportion in the 0° direction can be increased, such as setting the material proportion in the 0° direction to 60% or more; if the hollow beam is biased to protect the extrusion and stretching force at the flange 2, the material proportion in the 90° direction can be increased, such as setting the material proportion in the 90° direction to 60% or more.

[0054] The annular layer 30 is laid in a back-shaped full package and adjacent layer lap joint interface staggered manner.

[0055] In this embodiment, through the arrangement of the annular layer 30, the delamination between the side surface layer 20 and the U-shaped layer 10 at both ends is effectively reduced or even avoided, and the stability and reliability of the overall structure of the hollow beam are effectively ensured.

[0056] In this embodiment, the annular layer 30 can mainly have a material proportion in the ±45° direction to ensure the performance of the annular layer 30 in bearing the tearing force at the junction corner with the U-shaped layer 10 and the surface layer 20.

[0057] In actual layering operation, during the laying operation of the U-shaped layer 10, the surface layer 20, and the annular layer 30, the existing conventional layering operation mode can be referred to, for example, the continuous layering in the same angle is not more than three layers, and the interval of the layers in different directions is used to ensure the interlayer shear of the layering, avoid delamination, and reduce thermal residual stress and curing stress.

[0058] The hollow beam in the embodiment can also improve the wear resistance and indentation resistance of the surface by laying 0° or high modulus fibers on the surface.

[0059] The carbon fiber hollow beam structure in the embodiment is applied to an aircraft wing, and the carbon fiber hollow beam structure in any one of the above embodiments is used to set the hollow beam between the upper and lower skins 100, and the turn-up 2 and the support wall 12 of the hollow beam are attached to the inner side of the skin 100, as shown in the drawing, to form the main load-bearing component of the wing. Figure 6

[0060] Of course, the carbon fiber hollow beam structure in the embodiment can also be applied to other fields and other structures, including but not limited to the fields of aerospace, rail transit, vehicles, etc., such as using the hollow beam as a support mounting beam in an X-ray machine or other equipment, which can effectively reduce the weight while effectively ensuring the stability of the overall structure during use through reliable structural strength and comprehensive mechanical properties.

[0061] The hollow beam in the embodiment can be composed of carbon fiber layers, which effectively realizes and ensures the comprehensive mechanical properties of the hollow beam in terms of high specific strength, high fatigue strength, high bending resistance and deformation resistance, etc., and greatly improves and ensures the universality of the hollow beam in combination with the light weight and corrosion resistance of the carbon fiber material, especially in the fields of aerospace, rail transit, vehicles, etc.

[0062] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between each embodiment can be mutually referred to.

[0063] The above description is an explanation of the application, not a limitation of the application, and the scope of the application is defined in the claims. Any modification within the protection scope of the application can be made.​

Claims

1. A carbon fiber hollow beam structure, characterized in that: The hollow tube (1) includes a support wall 1 (11) and a support wall 2 (12) arranged opposite to each other. The end of the support wall 1 (11) extends away from the hollow tube (1) to form a flange (2). The outer side of the flange (2) is coplanar with the outer side of the support wall 2 (12). The middle of the support wall 2 (12) is concave towards each other to form a concave structure (3).

2. The carbon fiber hollow beam structure as described in claim 1, characterized in that: The hollow tube (1) is formed by two opposing support walls (11 and 12). The flange (2) is formed at the junction of the support wall (11) and the support wall (12). The support wall (11) and the flanges (2) at both ends together form a U-shaped structure with the opening facing away from the hollow tube (1). The junction of the support wall (11) and the support wall (12) in the hollow tube (1) forms a rounded corner (4).

3. The carbon fiber hollow beam structure as described in claim 1, characterized in that: The concave structure (3) is a U-shaped structure with its opening facing away from the hollow tube (1). The opposite sidewalls of the concave structure (3) are inclined surfaces (31) forming an outward opening. The corners of the concave structure (3) and the connection between the concave structure (3) and the second support wall (12) are all set with rounded corners.

4. The carbon fiber hollow beam structure as described in claim 1, characterized in that: The inner side of the flange (2) forms a rounded corner (5) where it meets the support wall (11), and / or the thickness of the flange (2) is greater than the thickness of the support wall (12).

5. A carbon fiber hollow beam structure as described in claim 1, characterized in that: The hollow beam is made of carbon fiber composite material ply, including a surface ply (20) arranged at intervals. An annular ply (30) is attached to the middle of the intervals between the surface ply (20). U-shaped ply (10) with outward openings are arranged between the intervals of the surface ply (20) on the opposite side of the annular ply (30). The annular ply (30) and the U-shaped ply (10) on the outer surface and the surface ply (20) together form a hollow tube (1). The surface ply (20) and the annular ply (30) are both concave in the middle to form a concave structure (3). The side of the U-shaped ply (10) and the edge of the surface ply (20) are attached to each other to form a flange (2).

6. The carbon fiber hollow beam structure as described in claim 5, characterized in that: The junction of the annular ply (30), the surface ply (20), and the U-shaped ply (10) forms a triangular hollow area, and a filler (50) is provided in the triangular hollow area; the filler (50) is filled by rolling material along the length of the hollow beam.

7. A carbon fiber hollow beam structure as described in claim 5, characterized in that: A reinforcing ply (40) is laid on the inner side of the annular ply (30) located on the opposite side of the concave structure (3), and the laying direction of the reinforcing ply (40) is along the length direction of the hollow beam.

8. An application of a carbon fiber hollow beam structure, characterized in that: When applied to aircraft wings, the hollow beam structure of carbon fiber as described in any one of claims 1-7 is adopted, with the hollow beam disposed between the upper and lower skins (100), and the flange (2) and the second support wall (12) of the hollow beam attached to the inner side of the skin (100).

9. A layup method for a carbon fiber hollow beam structure according to any one of claims 1-7, characterized in that: Lay out the ring-shaped ply (30) and the U-shaped ply (10), with the U-shaped ply (10) facing outward and placed on the opposite side of the ring-shaped ply (30). Lay out the two side ply (20) together on the opposite side of the U-shaped ply (10) and the outside of the ring-shaped ply (30).

10. The layup method for carbon fiber hollow beam structure as described in claim 9, characterized in that: The U-shaped ply (10) is evenly distributed in the 0°, 90°, 45°, and -45° directions, or it is laid in the 90°, 45°, and -45° directions with the material ratio in the 90° direction being greater than the material ratio in the ±45° direction; the surface ply (20) has a material ratio of more than 50% in the 0° or 90° direction; the annular ply (30) is laid in a loop-shaped full-coverage manner with staggered overlaps between adjacent layers.

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