Reinforcing structure of stringer bonding area of pressure-bearing wall plate and reinforced pressure-bearing wall plate
By setting a sandwich layer and fasteners in the bonding area of the stringer, the problem of cracking in the bonding area between the stringer and the bearing wall panel was solved, the bending stiffness and structural efficiency were improved, crack propagation was controlled, and lightweight structural optimization was achieved.
Patent Information
- Application Number
- CN202511928287.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-02-13
AI Technical Summary
Existing technologies address the cracking problem at the bonded zone between the girder and the bearing wall by increasing the thickness of the bearing wall, but this leads to an increase in structural weight and fails to fully utilize the post-buckling bearing capacity of the reinforced bearing wall, thus reducing structural efficiency.
A core layer and fasteners are installed in the girder bonding area. The core layer is arranged along the length of the girder or intermittently. The fasteners fix the girder, and the structural layout is optimized to improve bending stiffness and control crack propagation.
It improves the bending stiffness of the bonded zone of the girder, reduces the local stress level, makes full use of the post-buckling bearing capacity of the pressure-bearing wall panel, improves structural efficiency and controls crack propagation.
Smart Images
Figure CN121516218A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of pressure-bearing wall panels for aviation, and in particular to a reinforcement structure for the bonding area of the stringers of a pressure-bearing wall panel and a reinforced pressure-bearing wall panel having the reinforcement structure. Background Technology
[0002] In the aerospace field, stiffened pressure-bearing panels are the primary load-bearing structures, and the integrity of the bonded zone between the pressure-bearing panel and the girder directly determines the overall structural load-bearing safety. When the pressure-bearing panel buckles under compressive loads, the bonded zone between the girder and the pressure-bearing panel will crack due to the large deformation of the pressure-bearing panel. Once cracking occurs in the bonded zone, the crack will rapidly propagate along the girder direction, causing the girder to completely separate from the pressure-bearing panel, significantly affecting the overall load-bearing capacity of the structure.
[0003] Currently, the common approach to solving the above problems is to increase the amount of material used, i.e., by increasing the thickness of the bearing wall panels to reduce deformation. However, this method increases the weight of the bearing wall panels, changes the load distribution ratio between the girder and the bearing wall panels, causing the bearing wall panels to bear more load and weakening the load-sharing effect of the girder. This can easily lead to the bearing wall panels entering the crushing mode prematurely before reaching the buckling mode, failing to fully utilize the post-buckling capacity of the reinforced bearing wall panels. In other words, while increasing the amount of material used, the post-buckling capacity of the bearing wall panels is wasted, thereby reducing structural efficiency. Summary of the Invention
[0004] To at least partially solve the aforementioned problems of the prior art, the present invention provides a reinforcing structure for the bonding area of the girder of a pressure-bearing wall panel and a reinforced pressure-bearing wall panel having the reinforcing structure.
[0005] In a first aspect, the present invention provides a reinforcing structure for the bonding area of a load-bearing wall panel stringer, the reinforcing structure comprising a stringer and a core layer disposed within the ply of the stringer bonding area;
[0006] The sandwich layer is arranged along the entire length of the stringer; and / or
[0007] The core layer is intermittently arranged along the length of the stringer to correspond to the position where the buckling deformation of the bearing wall panel is the greatest along the length of the stringer; and the stringer bonding area is also provided with fasteners that are alternately arranged with the core layer to correspond to the position where the buckling deformation of the bearing wall panel is the least along the length of the stringer, and the fasteners are used to fix the stringer.
[0008] Optionally, the number of ply layers in the stringer bonding area is even, and the core layer is disposed at the center of the thickness of the ply layers in the stringer bonding area; and / or
[0009] The number of layers in the stringer bonding area is odd, and the core layer is disposed adjacent to the center layer of the stringer bonding area and located on the side of the center layer of the stringer bonding area closer to the stringer bonding surface.
[0010] Optionally, the core layer has a loose structure.
[0011] Optionally, the fastener is a fixing nail.
[0012] Optionally, the thickness of the sandwich layer is the same as that of the ply layer in the stringer bonding area.
[0013] In a second aspect, the present invention provides a reinforced pressure-bearing wall panel, comprising a pressure-bearing wall panel and a reinforcing structure for the bonding area of the stringers of the pressure-bearing wall panel as described above.
[0014] Optionally, the entire stringer of the sandwich layer corresponds to the non-buckling sensitive area of the pressure-bearing wall panel.
[0015] Optionally, the stringers of the sandwich layer are intermittently arranged to correspond to the buckling-sensitive areas of the pressure-bearing wall panel.
[0016] Optionally, the non-buckling sensitive area is the region located at both ends of the two stringers in a direction perpendicular to the length direction of the bearing wall panel and the stringer.
[0017] Optionally, the buckling-sensitive area is the region occupied by the stringers other than the two stringers located at the two ends of the load-bearing wall panel in a direction perpendicular to the length direction of the stringer.
[0018] In a reinforcement structure for the bonded area of a load-bearing wall panel according to the present invention, by setting a sandwich layer, the bending stiffness of the bonded area of the stringer is effectively increased, the local stress level on the load-bearing wall panel is reduced, the post-buckling bearing capacity of the load-bearing wall panel is fully utilized, and the structural efficiency is improved. Simultaneously, the overall structure of the load-bearing wall panel is optimized through different arrangements of the sandwich layer. Furthermore, by using fasteners to secure the stringer, the propagation of cracks in the bonded area along the length of the stringer can be controlled. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the reinforcement structure of the bonding area of the pressure-bearing wall panel stringer according to an embodiment of the present invention;
[0020] Figure 2 This is a schematic diagram of the positional structure of the fastener and the sandwich layer in one embodiment of the present invention;
[0021] Figure 3 This is a schematic diagram showing the positional distribution of the sandwich layer on the pressure-bearing wall panel according to an embodiment of the present invention. Detailed Implementation
[0022] The following reference Figures 1-3 This invention describes a reinforced structure for the bonding area of a load-bearing wall panel stringer and a reinforced load-bearing wall panel having the same structure. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.
[0023] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0024] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0025] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0026] Reinforced pressure-bearing wall panels are common pressure-bearing structures in the aerospace field. They consist of a pressure-bearing wall panel and multiple stringers bonded to the same side of the pressure-bearing wall panel. These stringers are spaced apart and extend parallel to each other along their respective length directions. Each stringer is composed of multiple layers, either in even or odd numbers.
[0027] refer to Figures 1-3 This invention provides a reinforcement structure for the bonding area of a load-bearing wall panel's stringers and a reinforced load-bearing wall panel having this reinforcement structure. Figure 1 The cross-section of the stringer is shown. Figure 2 The longitudinal section of the stringer is shown. The reinforcing structure includes a stringer 2 and a core layer 3 disposed within the ply of the stringer 2's bonding area. In the non-buckling-sensitive area of the bearing wall panel 1 (i.e., the area with minimal deformation), the core layer 3 is arranged along the entire length of the stringer 2, and its length and width are preferably smaller than the length and width of the bonding area of the stringer 2, respectively, and it is completely covered by the bonding area of the stringer 2. In the buckling-sensitive area of the bearing wall panel 1 (i.e., the area with severe deformation), the core layer 3 is intermittently disposed along the length of the stringer 2, and is disposed at the location of the greatest buckling deformation of the bearing wall panel 1. Optionally, the spacing between two adjacent intermittently disposed core layers 3 is 30 mm.
[0028] In the buckling-sensitive area of the bearing wall panel 1, fasteners 4 are also provided along the length of the girder 2 at the position where the buckling deformation of the bearing wall panel 1 is minimal, for fixing the girder 2 bonding area and the bearing wall panel 1.
[0029] As mentioned earlier, the bearing wall panel includes buckling-sensitive and non-buckling-sensitive zones, as well as the locations of maximum and minimum buckling deformation. Through structural analysis and strength calculations, and by observing the degree of bending under stress and deformation in the structural mechanics model, areas with more severe bending deformation can be designated as buckling-sensitive zones, while other areas can be designated as non-buckling-sensitive zones. The degree of bending deformation can be set based on engineering experience. Through structural analysis and strength calculations, the buckling waveform of the bearing wall panel along the girder length can be obtained. Based on the buckling waveform, the locations of maximum buckling deformation (i.e., peak positions) and minimum buckling deformation (i.e., no deformation or essentially no deformation) along the girder length can be accurately determined. Determining the location through structural analysis and strength calculations is a standard procedure and will not be elaborated upon here.
[0030] Based on engineering experience, in specific implementation, the area where the two long girder 2 are located at the two ends of the direction perpendicular to the length direction of the bearing wall plate 1 and the long girder 2 can be selected as the non-buckling sensitive area, and the area where the remaining long girder 2 is located can be selected as the buckling sensitive area.
[0031] By incorporating the core layer 3, the bending stiffness of the bonded zone of the girder 2 can be effectively increased, the local stress level on the bearing wall panel 1 can be reduced, the post-buckling bearing capacity of the bearing wall panel 1 can be fully utilized, and the structural efficiency can be improved. Simultaneously, different arrangements of the core layer 3 optimize the overall structure of the reinforced bearing wall panel. Furthermore, by using fasteners 4 to secure the girder 2, the propagation of cracks in the bonded zone along the length of the girder 2 can be controlled.
[0032] Those skilled in the art will understand that when selecting the core layer 3, it is preferable to provide as much bending stiffness as possible to the bonding area of the girder 2 while minimizing the additional weight that the core layer 3 brings to the overall structure. Therefore, the core layer 3 is generally made of a lightweight and high-stiffness material to reduce the added weight while increasing bending stiffness. Optionally, the core layer 3 has a loose structure, for example, a foam structure. A loose structure not only reduces the increase in the overall structural weight but also provides a certain degree of buffering and deformation coordination when the bearing wall panel 1 buckles.
[0033] Furthermore, when the number of ply layers of the stringer 2 is even, the core layer 3 is preferably located at the center of the thickness of the bonded area ply of the stringer 2, which is equivalent to making the core layer 3 the center layer of the bonded area ply of the stringer 2. When the number of ply layers of the stringer 2 is odd, the core layer 3 is preferably located adjacent to the center layer of the bonded area ply of the stringer 2 and on the side of the center layer of the bonded area ply of the stringer 2 closer to the bonded surface of the stringer 2. Whether the core layer 3 is located at the center of the thickness of the bonded area ply of the stringer 2, so that the bonded area ply of the stringer 2 is symmetrically distributed along the core layer 3, or the core layer 3 is located adjacent to the center layer of the bonded area ply of the stringer 2 and on the side of the center layer of the bonded area ply of the stringer 2 closer to the bonded surface of the stringer 2, the purpose is to enable the core layer 3 to play a better role in the stress area. By optimizing the distribution position of the core layer 3, the bending stiffness can be further improved and the local stress can be reduced.
[0034] For example, the original ply of stringer 2 is [45 / 0 / -45 / 90 / 0 / 0 / 90 / -45 / 0 / 45]. The number of ply layers of stringer 2 is an even number, a total of 10 layers. Then the position of the core layer 3 in the thickness direction of the bonding area of stringer 2 is the ply center. At this time, the ply of the bonding area of stringer 2 can be regarded as [45 / 0 / -45 / 90 / 0 / core layer / 0 / 90 / -45 / 0 / 45]. The original ply of stringer 2 is [45 / 0 / -45 / 90 / 0 / 90 / -45 / 0 / 45]. Since the number of layers in stringer 2 is odd, there are a total of 9 layers. The core layer 3 is adjacent to the center layer of the stringer 2 bonding area ply and is located on the side of the center layer of the stringer 2 bonding area ply closer to the bonding surface of stringer 2. In this case, the ply of the stringer 2 bonding area can be considered as [45 / 0 / -45 / 90 / 0 / core layer / 90 / -45 / 0 / 45]. Here, the fiber layup angle of the stringer 2 ply represents a specific ply; for example, 45 refers to a stringer 2 ply with a fiber layup angle of 45°.
[0035] Optionally, fastener 4 is a fixing nail, which is used to fix the stringer 2 by nailing. The structure is simple and the operation is convenient.
[0036] Optionally, the core layer 3 has the same ply thickness as the stringer 2. Taking a stringer 2 ply with 10 layers, each 0.2 mm thick, for a total thickness of 2 mm, as an example, the added core layer 3 would also have a thickness of 2 mm. Having the core layer thickness consistent with the original stringer thickness can further increase structural stiffness, reduce buckling-induced deformation, and lower local stress levels.
[0037] Furthermore, such as Figure 3 As shown, the pressure-bearing wall panel 1 has frames 11 at both ends along the length of the girder 2. The core layer 3 can have a gap between the two frames 11 of the pressure-bearing wall panel 1 along the length of the girder 2 to facilitate the installation of the frames 11 or the girder 2 of the pressure-bearing wall panel 1. Optionally, the gap is 30mm.
[0038] Using the formula for calculating bending stiffness
[0039]
[0040] and the formula for calculating local stress
[0041]
[0042] It can be verified that, after using the sandwich layer 3, when the overall thickness of the bonding area of the stringer 2 increases by 1 time,
[0043]
[0044] The bending stiffness A is three times the original, and the local stress B is reduced to one-third of the original.
[0045] Where E is the material stiffness of stringer 2. For the material of stringer 2, Poisson's ratio 1 / 2 thickness of stringer 2, h is the distance between the centers of the upper and lower panels of sandwich layer 3, M is the bending moment of the bonding zone, and b is the width of sandwich layer 3.
[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.
Claims
1. A reinforcement structure for the bonding area of a load-bearing wall panel stringer, characterized in that, The reinforcing structure includes a stringer and a core layer disposed within the ply of the stringer bonding area. The sandwich layer is arranged along the entire length of the stringer; and / or The core layer is intermittently arranged along the length of the stringer to correspond to the position where the buckling deformation of the bearing wall panel is the greatest along the length of the stringer; and the stringer bonding area is also provided with fasteners that are alternately arranged with the core layer to correspond to the position where the buckling deformation of the bearing wall panel is the least along the length of the stringer, and the fasteners are used to fix the stringer.
2. The reinforced structure for the bonding area of the load-bearing wall panel stringer according to claim 1, characterized in that, The number of ply layers in the stringer bonding area is even, and the core layer is located at the center of the thickness of the ply layers in the stringer bonding area; and / or The number of layers in the stringer bonding area is odd, and the core layer is disposed adjacent to the center layer of the stringer bonding area and located on the side of the center layer of the stringer bonding area closer to the stringer bonding surface.
3. The reinforced structure for the bonding area of the load-bearing wall panel stringer according to claim 1, characterized in that, The core layer has a loose structure.
4. The reinforced structure for the bonding area of the load-bearing wall panel stringer according to claim 1, characterized in that, The fasteners are fixed nails.
5. The reinforced structure for the bonding area of the load-bearing wall panel stringer according to claim 1, characterized in that, The thickness of the sandwich layer is the same as that of the bonded area of the stringer.
6. A reinforced load-bearing wall panel, characterized in that, It includes a pressure-bearing wall panel and a reinforcement structure for the bonding area of the pressure-bearing wall panel stringer as described in any one of claims 1-5.
7. The reinforced load-bearing wall panel according to claim 6, characterized in that: The entire stringer of the sandwich layer corresponds to the non-buckling sensitive area of the pressure-bearing wall panel.
8. The reinforced load-bearing wall panel according to claim 6, characterized in that: The intermittently arranged girder of the sandwich layer corresponds to the buckling-sensitive area of the pressure-bearing wall panel.
9. The reinforced load-bearing wall panel according to claim 7, characterized in that, The non-buckling sensitive area is the region located at both ends of the two stringers in a direction perpendicular to the length direction of the bearing wall panel and the stringer.
10. The reinforced load-bearing wall panel according to claim 8, characterized in that, The buckling-sensitive zone is the area occupied by the stringers other than the two stringers located at the two ends of the load-bearing wall panel in a direction perpendicular to the length direction of the stringer.