A honeycomb edge reinforcing structure based on foaming glue filling and a filling method

Abstract

The application discloses a kind of based on foaming glue filling honeycomb edge reinforcing structure and filling method, it is related to plastic reinforcing design technical field, through the rough layer, functional coating, space architecture support, foaming glue filling layer and the multilayer composite structure of buffer transition layer collaborative design, realize the high strength, fatigue resistance, directional expansion filling connection between honeycomb core material and plastic shell.The application introduces finite element analysis and sensitivity calculation, optimizes support arrangement and injection hole position, and combines the main modal direction to guide stress path;By real-time adjustment injection direction, rate and length, realize stress matching layering quantitative glue injection.System is completed simultaneously under temperature control or ultraviolet condition Foaming glue expansion, interface crosslinking and buffer attachment, build chemical adhesion, structure bearing and stress absorption integrated composite interface system, significantly improve the dimensional stability, fatigue life and bonding reliability of honeycomb edge structure.

Description

Technical Field

[0001] This invention relates to the field of plastic reinforcement design technology, specifically to a honeycomb edge reinforcement structure and filling method based on foam filling. Background Technology

[0002] In the manufacturing of lightweight honeycomb sandwich structures, the edge areas often need to be filled with expanding foam to enhance structural stability and improve interfacial bonding strength. However, existing technologies mostly employ unidirectional foam injection or simple geometric layout of support structures, lacking dynamic perception and control of the actual stress response of the honeycomb core material. This leads to unstable expansion paths of the injected adhesive, localized stress concentration, and problems such as cracking of the honeycomb wall and delamination at the interface. Especially under multi-temperature environments or long-term fatigue loads, the lack of a synergistic curing mechanism between the expanding foam and the honeycomb structure makes the interface prone to micro-cracks, aging, or peeling, seriously affecting the service reliability of the structure.

[0003] In addition, traditional honeycomb structures often use integral potting or adhesive encapsulation when covering the edges or connecting the shells. This results in problems such as poor bonding at the foam interface, disordered filling paths, stress concentration due to thermal expansion and contraction, and delamination under fatigue loads, which seriously restricts their application life and reliability in lightweight structural components and composite shell structures for transportation equipment.

[0004] In view of this, the present invention provides a honeycomb edge reinforcement structure and filling method based on foam filling, thereby solving the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a honeycomb edge reinforcement structure and filling method based on foam filling, which has the functions of guiding the injection path and multi-interface fatigue protection, so as to solve the technical problems of weak foam bonding, stress concentration and uneven injection in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a honeycomb edge reinforcement structure based on expanded foam filling, disposed between a honeycomb core material and a plastic shell, with the position of the plastic shell relative to the honeycomb core material being the outer side, comprising:

[0008] A roughening layer, provided on the outer surface of the honeycomb core material facing the plastic shell, has grooves and pits;

[0009] A functional coating covering the outer surface of the roughening layer includes a coupling agent and / or a block polymer that simultaneously crosslinks with the roughening layer and the foam filler layer.

[0010] At least one spatial structure support is provided, which encloses and forms multiple foam-filled cavity areas, and each cavity area is provided with a spatial structure support at its top; the spatial structure support includes: having at least one injection hole;

[0011] The injection positioning component includes injection holes for defining the injection position of the foam adhesive. The injection holes are arranged coaxially through the honeycomb thickness direction and distributed in a staggered array in the planar direction to form a non-overlapping arrangement structure of the injection path. Each injection hole is provided with a pressure limiting cavity and a flexible sealing sheet below it. The flexible sealing sheet closes the injection hole after the adhesive expands to form a self-sealing structure.

[0012] Flexible positioning edges are used to connect injection-molded positioning parts and rigid positioning edges;

[0013] The rigid and flexible positioning edges together enclose and form the cavity filling area;

[0014] The expanding foam filling the cavity area constitutes a expanding foam filling layer;

[0015] A buffer transition layer is set between the plastic shell and the outermost space frame support. It is a flexible buffer membrane with elastic modulus, serving as a transition section between the foam and the plastic shell.

[0016] The foam components, functional coatings, and buffer transition layers used in the foam filling layer complete their respective reactions or bonding processes under uniform temperature control or ultraviolet excitation conditions, thus constructing a multi-layer composite interface system.

[0017] Injection molding positioning components also include:

[0018] A support anchoring structure is provided on the outer periphery of the injection hole for fixing the injection hole;

[0019] The pressure-limiting cavity is equipped with a pressure-limiting mechanical locking component. Under the action of the pressure-limiting mechanical locking component, the flexible sealing sheet is pressed into the injection hole to form a self-sealing structure.

[0020] The configuration logic of the spatial architecture support:

[0021] Step A1: Construct a finite element model of the honeycomb edge reinforcement structure and obtain the boundary conditions; the boundary conditions include honeycomb edge constraint conditions, foam expansion load constraint conditions, and plastic shell external load constraint conditions.

[0022] Step A2: Perform custom mesh discretization on the honeycomb edge reinforcement structure, wherein the filling cavity area corresponding to the foam filling layer is subjected to local mesh refinement to generate structural discrete units, and label the material properties of each structural discrete unit.

[0023] Step A3: Based on the boundary conditions established in Step A1, the mesh model generated in Step A2, and the material property annotations, perform static finite element analysis on the honeycomb edge-reinforced structure to obtain the nodal stress response and displacement distribution of the structure under the combined action of the foam expansion internal pressure and external load, and establish the stress-displacement mapping relationship of the honeycomb structure.

[0024] Step A4: Based on the nodal stress response obtained in step A3, perform eigenvalue processing on the stiffness matrix of the cellular structure to obtain the flexibility matrix of the cellular element and calculate the response sensitivity of each discrete element of the structure.

[0025] Step A5: Divide the normal stress area and the concentrated stress area based on the sensitivity threshold; deploy multiple spatial structure supports in the concentrated stress area and fill them with high-density foam, and deploy spatial structure supports around the normal stress area and fill them with low-density foam.

[0026] As a preferred technical solution of the first aspect of the present invention, the wall thickness and area of ​​the concentrated stress area are analyzed to calculate the required number of spatial structure supports.

[0027] As a preferred embodiment of the first aspect of the present invention, the logic for obtaining the injection hole position is as follows:

[0028] The number of spatial architecture supports is determined based on the arrangement scheme of the spatial architecture supports, wherein the spatial architecture supports are multi-layer stacked structures in the direction of honeycomb thickness;

[0029] Based on the eigenvalue decomposition of the stiffness matrix of the honeycomb structure, the principal mode direction vector is extracted to determine the principal axis of the glue injection path and the direction of the injection hole arrangement.

[0030] A foaming expansion response model was established and the colloid propagation path, local deformation and stress concentration distribution under multiple injection points were simulated. The deformation field stability coefficient under different injection point layout conditions was calculated, and the set of points with the lowest stability coefficient was selected as the injection hole layout position.

[0031] Based on the multi-stage inverse finite element analysis framework, an objective function for minimizing the total strain energy of the honeycomb structure is constructed. Combining the stiffness matrix constraints and loading boundaries, the problem of injection point layout is solved in reverse to obtain the set of injection positions. The optimal solution is then used for the arrangement of injection holes to form an ordered injection point array.

[0032] As a preferred embodiment of the first aspect of the present invention, the process of obtaining the structural response through the foaming expansion response model includes:

[0033] Enter the foam density, expansion ratio, and injection point location;

[0034] Establish the colloidal volume growth function and the boundary force propagation function;

[0035] The path tracing algorithm was used to calculate the diffusion path of different colloids.

[0036] Obtain the maximum displacement and peak stress of the nodes of the structure under each injection path.

[0037] As a preferred embodiment of the first aspect of the present invention, the logic for obtaining the multilayer composite structure interface system is as follows:

[0038] A roughening layer is formed on the surface of the honeycomb core material and a functional coating is applied. The functional coating serves as the main reaction interface, providing chemical adhesion between the honeycomb core material and the foam.

[0039] Install the spatial framework support and inject expanding foam through the injection hole. The expanding foam serves as the core of structural load-bearing and fills and reinforces the edge structure. The expanding foam expands in a directional manner within the confinement of the spatial framework support to form a foam filling layer. A buffer transition layer is set between the foam filling layer and the plastic shell as a stress buffer and edge sealing protection layer to absorb the interface stress concentration caused by heat-load.

[0040] The buffer transition layer is an elastic film material with thermal softening or ultraviolet response properties. The buffer transition layer is activated by plasma or coated with a photosensitive initiation layer, and forms a surface-level intercalation with the surface of the bubble that is not completely cured under ultraviolet irradiation conditions.

[0041] The functional coating, foam, and buffer transition layer are processed simultaneously under uniformly controlled temperature or ultraviolet excitation conditions, sequentially completing the interface reaction between the functional coating and the foam, the volume expansion and shaping of the foam, and the attachment of the buffer film, forming a multi-layer composite interface system.

[0042] In a second aspect, the present invention provides a filling method for a honeycomb edge reinforcement structure based on expanded foam filling, used to design the first aspect, comprising the following steps:

[0043] S1: Based on the preset finite element model of the honeycomb structure, extract the partition boundary information of the target cavity, establish a coordinate system for glue injection path planning, determine the injection point position and injection direction vector of the glue injection nozzle, and match the corresponding foaming glue density parameters for subsequent precise control of the filling process.

[0044] S2: The glue injection nozzle performs a directional injection operation of expanding foam into the target cavity with adjustable direction, adjustable rate, and adjustable duration based on the injection point location and partition boundary information; during the glue injection process, the nozzle attitude and injection parameters are automatically adjusted according to the compliance matrix and stress gradient direction in the target cavity.

[0045] S3: After the foam injection is completed, under a uniformly controlled temperature or ultraviolet excitation environment, the interfacial reaction between the foam and the functional coating, the volume expansion and shaping of the colloid, and the thermal adhesion process of the flexible buffer film are driven in sequence to construct a multi-layer composite structure interface system.

[0046] As a preferred embodiment of the second aspect of the present invention, the logic for obtaining the partition boundary information is as follows:

[0047] Based on the pre-set finite element analysis model of the honeycomb edge reinforcement structure, a structural mesh model is established for the honeycomb core material, spatial frame support and foam filling layer, the material properties of each region are labeled and stress-displacement response data are extracted;

[0048] Based on the stress-displacement response data, identify the normal stress region and the concentrated stress region in the honeycomb structure, and mark the corresponding foam filling layer as the target cavity.

[0049] Extract the spatial distribution boundary of each target cavity. The boundary information includes the geometric shape of the area enclosed by the spatial structure support, the stress bearing capacity, and the expected filling volume parameters.

[0050] As a preferred embodiment of the second aspect of the present invention, the injection parameters include injection direction, real-time injection rate, and injection duration; the adjustment logic of the nozzle posture and injection parameters is as follows:

[0051] Calculate the stress gradient direction vector based on the stress field corresponding to the target cavity, and set the rotation angle of the injection nozzle so that the injection direction and the stress gradient direction form an angle of 10° to 30° to achieve stress-guided filling path planning.

[0052] To accommodate assembly deviations in the honeycomb structure, the injection direction is provided with a posture tolerance of ±15°.

[0053] The real-time injection rate is based on the baseline injection rate as the initial value and is corrected by combining the target cavity flexibility value to form a flexibility-correlated real-time injection rate.

[0054] The injection duration is calculated by integrating the target injection volume with the real-time injection rate. When the injection volume reaches a preset threshold, the injection operation is automatically terminated in a closed loop.

[0055] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0056] This invention achieves high adhesion, low stress accumulation, and long-lasting interface stability of the foamed adhesive in the edge region of the honeycomb structure through a dual-enhancement mechanism of microstructure and coupling agent, a rigid-flexible spatial architecture support 3, a finite element-optimized adhesive injection path guidance design, and a thermal-mechanical strain buffer design of the flexible membrane material. This significantly improves the service life of the honeycomb structure under complex working conditions such as thermal cycling and vibration shock. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0058] Figure 1 This is a schematic diagram of the honeycomb edge reinforcement structure of the present invention.

[0059] Figure 2 This is a schematic diagram of the honeycomb edge reinforcement structure with multiple spatial architecture supports of the present invention.

[0060] Figure 3 This is a schematic diagram of the spatial architecture support structure of the present invention.

[0061] Figure 4 This is a cross-sectional view of the injection-molded positioning component of the present invention.

[0062] Figure 5 This is a flowchart of the logic method for obtaining the injection position of the foam adhesive according to the present invention.

[0063] Figure 6 This is a flowchart of the filling method for the honeycomb edge reinforcement structure of the present invention.

[0064] Explanation of reference numerals in the attached figures:

[0065] 1. Roughening layer; 2. Functional coating; 3. Spatial structure support; 301. Injection molding positioning component; 3011. Injection molding hole; 3012. Support and anchoring structure; 3013. Pressure limiting cavity; 3014. Flexible sealing plate; 302. Rigid positioning edge; 303. Flexible positioning edge; 4. Foam filling layer; 5. Buffer transition layer. Detailed Implementation

[0066] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0067] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more exemplary embodiments. Numerous specific details are provided in the following description to give a full understanding of exemplary embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure may be practiced with one or more specific details omitted, or methods, components, steps, etc. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0068] Example 1

[0069] like Figure 1 As shown, the present invention provides a honeycomb edge reinforcement structure based on foam filling, which is disposed between the honeycomb core material and the plastic shell. Through the synergistic design of multi-layer materials and support structure, the controlled expansion of the filling path and the significant improvement of interface fatigue life are achieved. The honeycomb core material serves as a carrier, providing structural strength. The plastic shell acts as a boundary carrier, with foam filling between the honeycomb core material and the plastic shell. From the honeycomb core material outwards, the structure includes a roughening layer 1, a functional coating 2, a spatial framework support 3, a foam filling layer 4, and a buffer transition layer 5. The spatial framework support 3 is divided into multiple filling cavity regions, each with an independent injection hole 3011. The injection holes 3011 between adjacent spatial framework supports 3 are arranged in a coaxial through-type structure in the honeycomb thickness direction and are distributed in a staggered array in the planar direction. The center distance between each injection hole 3011 is matched with the foam cavity structure, allowing the same injection equipment to sequentially pass through multiple injection holes 3011 to complete the layered injection process. Each layer of injection is limited by the injection hole pressure limiting structure and automatically sealed after the adhesive expands, avoiding inter-layer adhesive penetration interference.

[0070] After injection molding, it can automatically seal to form a foam filling layer 4; the rigid and flexible boundaries of the spatial structure support 3 are arranged based on the stress path calculation results of finite element analysis, and the injection path control and stress guidance structure form a synergistic force guiding system; the outermost buffer transition layer 5 provides dynamic rebound and size buffer for the entire filling structure, adapting to thermal load and dynamic impact requirements.

[0071] To further explain, the roughening layer 1 is disposed on the side of the honeycomb core material facing the plastic shell, forming controllable microstructure pits such as dimples and grooves on the outer surface of the honeycomb core material, constituting a micro "support structure" system. The roughening layer 1 is formed by plasma etching, laser micro-engraving or mechanical sandblasting, which enhances the micro-mechanical interlocking force, increases the actual contact area, forms a physical interlocking similar to mortise and tenon or anchoring structure, improves the adhesion and retention force of the foam to the inner wall of the honeycomb after curing, and is not easy to peel off or slip even if micro-stress is generated at the interface, avoiding insufficient interface bonding force, which leads to delamination under thermal cycling or mechanical fatigue.

[0072] Functional coating 2 covers the surface of roughening layer 1 and contains coupling agent or block polymer that undergoes cross-linking reaction with roughening layer 1 and foam filler layer 4. It establishes a two-way chemical bridge at the interface, which greatly improves the initial adhesion and durability, reduces the possibility of aging peeling, and improves the chemical adhesion of the interface.

[0073] At least one spatial structure support 3 is disposed on the outside of the functional coating 2. Foam filling layer 4 is formed by filling the cavity area enclosed by the spatial structure support 3 with expanding foam. The spatial structure support 3 enhances the spatial support capacity.

[0074] It should be noted that: such as Figure 1 The diagram shows a spatial structure support 3, where the area between the spatial structure support 3 and the functional coating 2 is a foam filling layer 4; alternatively, it can be... Figure 2 As shown, on the basis of the spatial structure support 3, another spatial structure support 3 is added; then the area between the spatial structure support 3 and the spatial structure support 3 is still the foam filling layer 4. Different densities of foam are filled in different enclosed filling cavity areas to ensure the stress strength of the honeycomb structure while achieving lightweighting. That is to say, in the same enclosed filling cavity area, the foam filling is different densities under the same foam system.

[0075] Further explanation of the configuration logic of the spatial architecture support 3:

[0076] Step A1: Construct a finite element model of the honeycomb edge reinforcement structure and obtain the boundary conditions; the boundary conditions include honeycomb edge constraint conditions, foam expansion load constraint conditions, and plastic shell external load constraint conditions, wherein;

[0077] Cellular edge constraint conditions: Fixed constraints are applied to the outer edge nodes of the cellular core material, that is, the degree of freedom of all nodes on the outer perimeter boundary of the cellular core material is constrained. and ; Indicates the degree of freedom of displacement. This represents the rotational degree of freedom, simulating the actual working condition where the honeycomb core material is fixed by the plastic shell;

[0078] Expansion load constraint of expanding foam: A uniform internal pressure load is applied to the surface of the cavity (i.e., the expanding foam filling layer) enclosed by the space structure support 3 to simulate the internal pressure generated during the expansion of expanding foam. The pressure is set to 0.1~0.5 MPa, and the specific pressure is adjusted according to the density of the colloid and the expansion ratio.

[0079] External load constraints on plastic shells: Apply actual external loads (e.g., vertical loads of 100~500N or uniformly distributed loads) to the plastic shells to further clarify the load conditions of the structure under actual working conditions.

[0080] It should be noted that: the honeycomb core material and plastic shell are used as the frame load boundaries; all displacement and rotational degrees of freedom are constrained by the edge nodes of the honeycomb core material; internal pressure boundary conditions are applied to the foam filling layer, and the spatial structure support 3 is used as the equivalent boundary load and constraint to simulate the expansion force generated by the expansion process of the foam; the stress of foam of different densities in different target areas of the foam filling layer is simulated, and the relative displacement and stress response distribution between nodes are extracted to determine the optimal injection path and the most suitable injection hole location distribution scheme.

[0081] Step A2: Perform custom mesh discretization on the honeycomb edge reinforcement structure. The filling cavity area corresponding to the foam filling layer 4 is subjected to local mesh refinement to generate structural discrete units. The material properties of each structural discrete unit are labeled.

[0082] Specifically, the discrete structural unit includes:

[0083] Roughening layer 1 is marked as a rough element to capture the stress concentration effect of microstructure;

[0084] Functional coating 2 is marked as a coating bonding unit, which has nonlinear response characteristics of shear and peel behavior;

[0085] The spatial architecture support 3 is marked as a hybrid form of beam and shell elements to simulate a rigid-flexible connection boundary structure.

[0086] The foam filling layer 4 is marked as a solid element, and the volume growth function is defined by combining the material expansion coefficient and the foam expansion load constraint. According to the actual analysis requirements, local mesh refinement is adopted to capture the local stress concentration area, deformation path and nodal displacement characteristics under the action of foam expansion load.

[0087] The buffer transition layer 5 is marked as a flexible shell unit to express the interfacial energy absorption effect under thermal expansion and contraction.

[0088] The material properties include elastic modulus, Poisson's ratio, nonlinear constitutive parameters, volume expansion rate, and interface separation energy, which are used to analyze the mapping relationship between the structural stiffness matrix, nodal displacement vector, and external loads, providing a numerical basis for subsequent foam injection path optimization and structural response analysis.

[0089] Step A3: Based on the boundary conditions established in Step A1, the mesh model generated in Step A2, and the material property annotations, perform static finite element analysis on the honeycomb edge-reinforced structure to obtain the nodal stress response and displacement distribution of the structure under the combined action of the foam expansion internal pressure and external loads. Establish the stress-displacement mapping relationship of the honeycomb structure, expressed as:

[0090] ;

[0091] in: This is the external load vector that includes the internal pressure of the foam and the external operating load. The stiffness matrix of the cellular network. The nodal displacement vector;

[0092] Step A4: Based on the nodal stress response obtained in Step A3, calculate the stiffness matrix of the cellular structure. Eigenvalue processing is performed to obtain the cell cell compliance matrix. The structural response sensitivity is extracted according to the following formula;

[0093] To further explain, such as Figure 5 As shown, the stiffness matrix of the cellular structure The eigenvalue decomposition formula is: ;

[0094] in: These are eigenvalues; The main modal direction is used to identify the main deformation direction of the structure under loading. The main modal direction is used as the rigid edge setting guide reference of the spatial architecture support 3. The candidate injection points are uniformly projected onto the edge area of ​​the honeycomb structure along the main modal direction. A modal axis coordinate system is established as the reference framework for subsequent path simulation and hole placement to ensure that the expansion direction during the foam filling process is consistent with the structural response direction, thereby realizing stress guidance control and path structure collaborative optimization.

[0095] The sensitivity formula is:

[0096] in: For the first The sensitivity of a discrete structural unit For the first The nodal displacements corresponding to each discrete structural element. For the first Material property variables of a discrete structural unit; For the first The derivative of stiffness change of material property parameters corresponding to each discrete structural element; the negative sign comes from the directionality of chain derivatives.

[0097] It should be noted that the sensitivity formula is used to express the changing trend of the nodal displacement vector under changes in material property parameters. It is used for the optimized layout and material zoning control of the spatial framework support 3, and serves as the theoretical basis for structural zoning and injection path optimization. Step A3 constructs a linear static analysis solution to calculate the global displacement response of the honeycomb edge-reinforced structure, providing a complete displacement field. Step A4, based on the above displacement solution, performs partial derivative analysis on the structural stiffness parameters to construct the displacement sensitivity derivative, thereby identifying the local regions where the structural response changes most significantly. These two steps constitute a continuous mapping path from stress distribution to structural optimization, serving as an important theoretical foundation for the subsequent zoning of the spatial framework support 3 and the design of the injection hole 3011.

[0098] Step A5: The sensitivity is analyzed by threshold comparison to obtain the division into normal stress region and concentrated stress region;

[0099] The wall thickness and area of ​​the stress concentration area are analyzed to calculate the required number of spatial structure supports 3; the stress concentration area is filled with foam with a preset high threshold density to form a high modulus support.

[0100] Adjacent conventional stress areas are merged, and a spatial structure support 3 is set on the periphery. The conventional stress areas are filled with foam with a preset low threshold density.

[0101] The spatial structure support 3 effectively separates different stress areas to form a spatial structure support arrangement scheme. The filling density of foam in different areas is controlled by the expansion coefficient and stress response peak to ensure rapid release of local stress and adaptive rebound deformation; thereby improving the crack resistance and dimensional stability control of the edge area of ​​the honeycomb structure under dynamic impact and thermal expansion conditions.

[0102] It should be noted that: using the spatial structure support 3 to divide the normal stress area and the concentrated stress area ensures that different density foam is filled in each different stress area, which ensures that local stress is quickly dispersed in the early stage of filling expansion, controls the local stress peak, and improves the adaptive rebound ability and fatigue recovery performance of the filled area. It is especially suitable for crack protection and dimensional stability improvement of honeycomb structures under dynamic loads or deformation impact.

[0103] The logic for obtaining the position of the injection hole 3011 is as follows:

[0104] The number of spatial architecture supports 3 is determined based on the arrangement scheme of the spatial architecture support 3. Each spatial architecture support 3 is provided with at least one injection hole 3011. The injection holes 3011 are arranged in a coaxial through-type arrangement along the honeycomb thickness direction in the space, allowing the glue injection equipment to penetrate multiple injection holes layer by layer in the Z-axis direction for layered glue injection. In the XY plane direction of the honeycomb panel, the injection holes 3011 are distributed in a staggered array.

[0105] It should be noted that the spatial architecture support 3 has a multi-layer stacked structure in the honeycomb thickness direction, and is divided into multiple independent foamed cavity regions inside. Each foamed cavity region is provided with at least one injection hole 3011. The injection holes 3011 are arranged coaxially through the honeycomb thickness direction in space, allowing the glue injection equipment to penetrate multiple injection holes layer by layer in the Z-axis direction for layered glue injection, avoiding cross interference of multiple glue injection paths, and improving the uniformity of glue injection path and stress expansion stability.

[0106] The principal mode direction vector is obtained by eigenvalue decomposition of the stiffness matrix of the honeycomb structure, and the principal stress propagation direction of the honeycomb structure in the foam filling state is identified. This is used to determine the principal axis of the glue injection path and the confinement direction of the spatial structure support.

[0107] A foaming expansion response model was established, and the colloidal diffusion path, local node stress response and honeycomb structure displacement distribution under different injection point conditions were simulated by the expansion path tracking algorithm. The deformation field stability coefficient under different injection point layout conditions was calculated.

[0108] To further explain, the foaming expansion response model includes the foam density, expansion ratio, and initial injection point location, which is used to simulate the filling process of the foam under different injection point conditions and its local deformation and stress response to the honeycomb structure.

[0109] During the model solving process, an expansion path tracking algorithm is established by combining the boundary constraints of the predefined spatial architecture support to simulate multiple candidate injection points and obtain the volume expansion path of the colloid during the filling process, the colloid boundary advancement trend, the local node displacement response, and the stress concentration distribution.

[0110] To quantitatively evaluate the adaptability of each injection point layout scheme to the honeycomb structure, a deformation field stability coefficient is introduced, which is calculated based on the following function:

[0111] ;

[0112] in: This represents the nodal displacement field during the filling process; This refers to the maximum allowable deformation limit of the structure; For local element strain energy; It should be the energy weighting factor; The strain energy threshold.

[0113] The lower the stability coefficient, the milder the structural response caused by the injection point, and the closer the system is to mechanical equilibrium. By comparing the simulation results of different injection points, the set of injection points with the lowest stability coefficient is selected as the optimization result to guide the layout of the injection holes 3011 in the space frame support, forming an ordered array of injection point inlets.

[0114] Based on the multi-stage inverse finite element analysis framework, an objective function for minimizing the total strain energy of the honeycomb structure is constructed. Combining the stiffness matrix constraints and loading boundaries, the problem of injection point layout is solved in reverse to obtain the set of injection positions. The optimal solution is used for the layout of injection holes 3011 to form an ordered injection point array, thereby completing the coupling and coordination optimization of the spatial structure support layout and injection path, realizing the equalization of structural response, stress-guided filling, and controllability of the injection path.

[0115] To further explain, the objective function is:

[0116] ;

[0117] in: Let be the total strain energy of the structure, representing the elastic energy stored after structural deformation. Minimizing strain energy means achieving optimal stress distribution and minimal overall deformation. The nodal displacement vector of the structure is a vector composed of the nodal displacements of the finite element model, representing the displacement of each node in the structure under stress. The stiffness matrix describes the structure's ability to resist deformation. It is determined by factors such as material properties, geometric characteristics, and element type, and reflects the rigid connections between structural nodes. is the transpose matrix of the displacement vector.

[0118] Using genetic algorithms, gradient optimization methods, or other numerical optimization algorithms, combined with the structural stiffness matrix By using stress-deformation inversion mapping, the optimal injection position of the structure is obtained, resulting in multiple injection position points that form an ordered injection inlet point array. Based on the injection inlet point array, the installation position of the actual injection-molded positioning component 301 in the honeycomb structure is determined.

[0119] like Figure 3 As shown, the space structure support 3 includes at least one injection-molded positioning component 301. Both ends of the injection-molded positioning component 301 are connected to the rigid positioning edge 302 through the flexible positioning edge 303. The rigid positioning edge 302 and the flexible positioning edge 303 work together to enclose and form a filling cavity area with the same density.

[0120] To further explain, the spatial architecture support 3 includes:

[0121] Injection positioning component 301, injection hole 3011 used to define the injection position of foam adhesive, such as Figure 4 As shown, the injection-molded positioning component 301 includes:

[0122] Injection hole 3011 is the injection position for the expanding foam, oriented on the injection positioning part 301. A corresponding support anchoring structure 3012 is located outside the injection hole 3011 to ensure the stability of the injection equipment. A pressure-limiting cavity 3013 is provided at the lower end of the injection hole 3011. The injection equipment passes through the injection hole 3011 into the pressure-limiting cavity 3013 and injects expanding foam into the expanding foam filling layer 4. After the expanding foam is filled, the injection equipment withdraws from the injection hole 3011. A pressure-limiting mechanical locking part is provided inside the pressure-limiting cavity 3013. Under the action of the mechanical clamping parts, the flexible sealing sheet 3014 adheres tightly to the dispensing equipment. As the dispensing equipment is removed, the foamed adhesive moves towards the pressure-limiting cavity 3013. The pressure-limiting cavity 3013 contains the flexible sealing sheet 3014. After the foamed adhesive is filled, the flexible sealing sheet 3014 is pressed against the inner wall of the cavity by the expansion pressure of the adhesive. The flexible sealing sheet 3014, corresponding to the outer periphery of the injection hole 3011, seals the injection hole 3011 under pressure, forming a self-sealing structure. This achieves automatic sealing of the injection channel, preventing adhesive overflow and ensuring the stability of the internal adhesive structure. The material of the flexible sealing sheet 3014 includes, but is not limited to, elastic polyurethane film, heat-sealable polyester film, or low-melting-point sealing sheet.

[0123] The rigid positioning edge 302 forms a closed cavity with the functional coating 2, providing expansion boundary stiffness to prevent warping and displacement of the honeycomb after filling. It is the termination surface of the expansion direction of the foam, improving the stability of the internal structure.

[0124] The flexible positioning edge 303, with its corrugated flexible edge, is used to provide micro-elastic restraining force in the early stage of foaming expansion, preventing the colloid from overflowing before initial curing, and at the same time releasing interfacial stress under thermal expansion and contraction, preventing the force point from being concentrated at the injection hole 3011.

[0125] It should be noted that the expanding foam is a liquid expanding foam with high permeability, adjustable density, and strong adhesion. Liquid expanding foam is used in applications requiring high-strength filling, structural reinforcement, sealing and sound insulation, or complex cavities. After injection through injection hole 3011, the expanding foam expands directionally under boundary constraints, forming a multi-layered interlocking structure with the honeycomb core material, effectively improving the interfacial adhesion and fatigue life between the expanding foam and the honeycomb structure. Flexible positioning edges 303 absorb stress caused by microscopic thermal expansion and contraction, preventing aging and peeling; rigid positioning edges 302 maintain overall deformation control of the filled area, ensuring consistent edge dimensions; reducing overall injection volume and material consumption, achieving both structural stability and lightweight design.

[0126] To further explain, each spatial structure support 3 divides the foam filling layer 4 into zones. Each zone forms a closed rigid boundary for the foam expansion path through a rigid positioning edge 302, providing reverse support and guiding the expansion direction away from the injection hole. A flexible positioning edge 303 is positioned near the injection hole, using a corrugated structure to provide initial elastic buffer space; it provides micro-expansion absorption capacity when the foam is first injected, preventing stress concentration from impacting the injection hole, while also possessing long-term stress relaxation capacity for later temperature change buffering. The entire structure resembles a pressure relief channel, with expansion from flexible to rigid, and the injection hole becoming the stress release "back side"; the coordinated design of geometry and materials allows the foam expansion force to actively "avoid" the injection hole, achieving directional expansion and internal stress diversion. Figure 1 As shown, within the foam filling layer 4, the rigid positioning edge 302 and the flexible positioning edge 303 together form an expansion stress guiding system.

[0127] In this process, the foam expands in volume along the direction indicated by the arrow after injection. The initial expansion force is buffered and absorbed by the flexible positioning edge 303, which prevents stress impact from concentrating on the injection positioning part 301 and damaging the solidified sealing structure of the injection hole 3011. Subsequently, the main stress is guided to the rigid positioning edge 302 to terminate and close, thereby achieving controllable stress path, stable interface, and reliable structure.

[0128] An injection hole 3011 is provided at the center of the injection-molded positioning part 301 of each spatial structure support 3, and combined with the pressure limiting cavity and flexible sealing sheet mechanism, a composite path of quantitative foaming adhesive introduction + local buffering + stress back expansion is constructed.

[0129] In summary, the edge area of ​​the honeycomb core material is first roughened to form a microstructure-reinforced roughened layer 1. Then, a functional coating 2 composed of a coupling agent or block polymer is applied to the surface of the roughened layer 1. After the functional coating 2 is completed and naturally dried, the spatial structure support 3 is installed to ensure a continuous and complete interface, avoiding coating gaps caused by structural obstruction during spraying. This ensures the chemical reaction coverage and bonding uniformity of the subsequent foam adhesive. The foam adhesive should be injected while the functional coating 2 is still within its reaction window (e.g., before aging or moisture absorption failure) to ensure that the terminal isocyanate groups can effectively crosslink with the hydroxyl / amino active end groups in the functional coating, forming a strong chemical bonding interface. During filling in the foam adhesive filler layer 4, the foam adhesive expands directionally within the physical confinement of the spatial structure support 3, forming continuous adhesion with the functional coating. The injection holes are sealed through a pressure-limiting cavity and a sealing structure, thereby improving injection stability and the service reliability of the edge structure. The process flow must be strictly followed in the aforementioned order to ensure the consistency of the multi-interface linkage reaction, the rationality of the structural stress distribution, and the integrity of the filling area. In addition, adhesive injection path control and interface protection measures should be implemented to achieve the best performance.

[0130] The functional coating 2 and the foam undergo a chemical cross-linking reaction through isocyanate and hydroxyl / amino functional groups to form a main interface bonding structure, thereby enhancing the chemical adhesion between the foam filling layer 4 and the honeycomb core material. The buffer transition layer 5 is an elastic film material with thermal softening or UV responsiveness, and it is separated from the foam filling layer 4 by the spatial structure support 3.

[0131] A buffer transition layer 5, positioned between the plastic shell and the outermost spatial structure support 3, consists of a flexible buffer membrane with a suitable elastic modulus. This acts as an "elastic transition zone" between the honeycomb core material and the foam, mitigating interfacial stress concentration caused by thermal expansion and contraction and fatigue loads, delaying crack initiation and propagation, and improving the fatigue life of the interface under cyclic loading. It can be selectively filled with flexible buffer material or low-density foam, or used as an unfilled flexible deformation buffer area to absorb structural micro-displacements and interfacial stresses caused by thermal expansion and contraction and dynamic loads.

[0132] The flexible buffer membrane can be a UV-responsive TPU or acrylate-modified membrane material. Its surface is plasma-activated or pre-coated with an initiation layer to provide free radical initiation grafting sites, facilitating free radical-assisted grafting bonding between the active groups in the functional coating and the membrane boundary.

[0133] To further explain, in order to achieve a long-term bond between the foam and the honeycomb structure interface, the foam components used in the foam filling layer 4, the functional coating 2, and the buffer transition layer 5 each complete their respective reaction or bonding processes under uniform temperature control or ultraviolet excitation conditions, constructing a multi-layer composite structure interface system with structural continuity, adhesion stability, and service compatibility; the logic for obtaining the multi-layer composite structure interface system is as follows:

[0134] Main reaction interface construction steps:

[0135] A functional coating is provided between the honeycomb core material and the foam filling layer. The functional coating contains functional groups that can undergo addition reactions with isocyanate groups (–NCO) in the foam. The functional groups include hydroxyl (–OH) or amino (–NH2) groups, which are used to form the main chemical bonding interface of polyurethane or urea structure during the expansion of the foam.

[0136] Assisted grafting treatment steps:

[0137] The buffer transition layer 5 is activated by plasma or coated with a photosensitive initiation layer to enhance free radical affinity and form a surface-level intercalation with the incompletely cured surface of the foam under ultraviolet irradiation conditions.

[0138] The buffer transition layer 5 is disposed between the foam filling layer 4 and the plastic shell, and is an elastic film material with thermal softening or UV response capabilities, such as a modified TPU film or an acrylic film material. After the foam expands, the buffer transition layer forms a local physical adhesion interface with the plastic shell and / or the upper surface of the outermost spatial structure support 3 through thermal bonding or surface-assisted grafting. Through structural pressing and partial surface activation, it achieves sealing and stress buffering effects. To enhance adhesion reliability, the flexible buffer film material can be activated by plasma or coated with a photosensitive initiation layer to improve free radical affinity, forming a surface-level intercalation with the incompletely cured area of ​​the foam surface under UV irradiation conditions.

[0139] Simultaneous activation and curing steps:

[0140] The functional coating 2, the foam adhesive, and the buffer transition layer 5 are processed simultaneously under uniformly controlled temperature conditions (75±5℃) or ultraviolet excitation conditions, and the following processes are completed sequentially:

[0141] a. The expanding foam completes its volume expansion and undergoes a cross-linking reaction with the functional coating 2;

[0142] b. The buffer transition layer 5 completes thermal softening and deformation and is attached to the surface of the plastic shell or the outermost space structure support 3;

[0143] c. The cavity structure is completely sealed and cooled and solidified to form a multi-layered composite structure with dimensional stability and interface durability;

[0144] Functional Layer Collaboration System:

[0145] In the completed multi-layered composite interface system:

[0146] a. The functional coating 2 serves as the main reaction interface, providing chemical adhesion between the honeycomb core material and the foam adhesive;

[0147] b. The foam filling layer 4 serves as the structural load-bearing core, filling and reinforcing the edge structure;

[0148] c. The buffer transition layer 5 serves as a stress buffer and edge sealing protection functional layer, used to absorb interface stress concentration caused by heat-load, and improve the fatigue life and anti-peeling performance of the edge structure.

[0149] Example 2

[0150] like Figure 6 As shown, based on Example 1, this embodiment provides a filling method for a honeycomb edge reinforcement structure based on expanding foam filling, including the following steps:

[0151] S1: Based on the preset finite element model of the honeycomb structure, extract the partition boundary information of the target cavity, establish a coordinate system for glue injection path planning, determine the injection point position and injection direction vector of the glue injection nozzle, and match the corresponding foaming glue density parameters for subsequent precise control of the filling process.

[0152] Specifically, the logic for obtaining the partition boundary information is as follows:

[0153] Based on the preset finite element analysis model of the honeycomb edge reinforcement structure, a structural mesh model is established for the honeycomb core material, the spatial structure support 3 and the foam filling layer 4, the material properties of each region are labeled and the stress-displacement response data are extracted.

[0154] Based on the stress-displacement response data, the conventional stress region and the concentrated stress region in the honeycomb structure are identified, and their corresponding foam filling layer 4 is marked as the target cavity.

[0155] Extract the spatial distribution boundary of each target cavity. The boundary information includes the geometric shape of the region enclosed by the spatial structure support 3, the stress bearing capacity, and the expected filling volume parameters.

[0156] S2: The glue injection nozzle performs a directional injection operation of expanding foam into the target cavity with adjustable direction, adjustable rate, and adjustable duration based on the injection point location and partition boundary information; during the glue injection process, the nozzle attitude and injection parameters are automatically adjusted according to the compliance matrix and stress gradient direction in the target cavity.

[0157] Specifically, the injection nozzle performs localized foaming adhesive injection into the target cavity according to the injection point location obtained in step A1; at the same time, the injection direction, injection rate and injection duration of the injection nozzle are dynamically adjusted according to the shape of the partition boundary and the path length, so as to achieve directional expansion, uniform filling and stress balance control of the foaming adhesive in the cavity.

[0158] The logic for adjusting the nozzle posture and injection parameters is as follows:

[0159] The gradient direction vector is calculated based on the stress field. The nozzle rotation angle is set so that the injection direction and the stress gradient direction form an angle θ, which is 10°~30°. An attitude tolerance of ±15° is set to adapt to the assembly error of the honeycomb structure.

[0160] It should be noted that: extracting the stress distribution field of the current target cavity from the finite element model. Based on the stress distribution field, the stress change rate is calculated, and the direction with the largest stress change rate is marked as the stress gradient direction. The rotation angle of the dispensing nozzle is set according to the stress gradient direction so that the dispensing path extends along the stress gradient direction as much as possible or forms a safe angle of less than 30° with it, so as to reduce structural interference to stress-sensitive areas and improve dispensing consistency and local strength stability.

[0161] The glue-dispensing nozzle automatically adjusts the spray angle via a multi-degree-of-freedom robotic arm. This ensures that the injection direction forms a safe angle with the stress gradient direction. The injection angle is marked as the target injection direction, and the injection path is adjusted to be arranged along the structural stress gradient direction to improve the filling uniformity.

[0162] It should be noted that the safety angle is the angle between the injection direction and the stress gradient direction, preferably between 10 and 30 degrees. Specifically, the safety angle is set as a reference value based on simulation results. In practical applications, the posture is adaptively adjusted in conjunction with the assembly and fit between the honeycomb core material, the plastic shell, and the injection positioning component. The injection nozzle is installed in the injection positioning component, allowing adjustment of the injection posture within the first adjustment angle range to automatically or manually align with the optimal injection direction under local boundary deviations. An operational tolerance of ±15 degrees is allowed to ensure that the overall injection path is controlled and adapts to manufacturing deviations.

[0163] Based on the cell cell compliance matrix The flexibility value of each target cavity combined with the baseline injection rate The real-time injection rate is obtained by correcting the velocity function model.

[0164] It should be noted that: a larger compliance value within the target cavity corresponds to a smaller stiffness, making it more suitable for low-speed injection and avoiding stress concentration in the structure due to colloid impact; conversely, a smaller compliance value within the target cavity corresponds to a larger stiffness, allowing for high-speed advancement and improving injection efficiency. The velocity function model is as follows:

[0165] ;

[0166] in: The real-time injection rate corresponding to the target cavity injection location; The base injection rate corresponding to the target cavity injection location. The target cavity reference compliance constant; For the first The flexibility of the target cavity: The adjustment coefficient is such as 0.5~1.

[0167] Further explanation: The real-time injection rate is adjusted based on the basic formula of the basic injection rate, and nonlinear correction is made by combining the stress gradient change rate in the target cavity and the real-time injection feedback state, so as to achieve dynamic adjustment and extract the updated real-time injection rate.

[0168] For example, by adding a formula, the control function can be constructed as follows:

[0169]

[0170] in: This represents the local stress gradient magnitude; a large value indicates a region of abrupt stress change in the structure. This refers to the resistance feedback amount monitored in real time during the glue injection process; coefficient. , and As a modulating factor, it controls the intensity of the injection rate's response to unstructured perturbations;

[0171] The above control mechanism enables the injection rate to be automatically adjusted under the triple mechanism of structure-driven, gradient feedback and real-time expansion feedback, thereby achieving steady-state glue injection and adaptive matching with the structure.

[0172] Injection duration depends on target volume With real-time injection rate The injection process is automatically terminated in a closed loop once the filling volume threshold is reached, calculated using integrals.

[0173] S3: After the foam injection is completed, under a uniformly controlled temperature or ultraviolet excitation environment, the interfacial reaction between the foam and the functional coating, the volume expansion and shaping of the colloid, and the thermal adhesion process of the flexible buffer film are driven in sequence to construct a multi-layer composite structure interface system.

[0174] Specifically, the logic for obtaining the multi-layered composite structure interface system is as follows:

[0175] The coupling component in functional coating 2 reacts with the isocyanate groups (–NCO) in the foam with hydroxyl / amino groups to generate a polyurethane or urea network, forming the main chemical bonding interface between the honeycomb core material and the filling layer.

[0176] The buffer transition layer 5 is composed of an elastic film material with thermal softening or UV response properties, and forms an adhesion and coating interface with the upper surface of the foam through structural pressing, UV activation or free radical-assisted grafting.

[0177] The buffer transition layer 5 is disposed between the foam filling layer 4 and the plastic shell, and is an elastic film material with thermal softening or UV response capabilities, such as a modified TPU film or an acrylic film material. After the foam expands, the buffer transition layer forms a local physical adhesion interface with the plastic shell and / or the upper surface of the outermost spatial structure support 3 through thermal bonding or surface-assisted grafting. Through structural pressing and partial surface activation, it achieves sealing and stress buffering effects. To enhance adhesion reliability, the flexible buffer film material can be activated by plasma or coated with a photosensitive initiation layer to improve free radical affinity, forming a surface-level intercalation with the incompletely cured area of ​​the foam surface under UV irradiation conditions.

[0178] The multi-interface linkage response is carried out synchronously at 75±5℃ or under specified excitation conditions, forming a triple structure: main reaction interface, stress-absorbing colloid, and buffer coating layer, providing honeycomb edge stability and multi-cycle load fatigue adaptability.

[0179] The three layers of material are simultaneously treated under the same temperature control (e.g., 75±5℃) or UV excitation conditions, and the following processes are completed respectively:

[0180] The expanding foam completes the volume expansion and reaction with the functional coating 2; the flexible buffer film completes the thermal softening deformation and adhesion; the cavity is completely sealed and cooled to solidify, forming a composite edge structure with good dimensional stability and multi-interface durability.

[0181] In the multi-layered composite structure interface system thus constructed:

[0182] Functional coatings construct the main reaction interface;

[0183] Expanded polyurethane foam forms the core of the structural load-bearing structure;

[0184] A flexible buffer membrane is constructed to form a stress-buffering and edge-sealing protection functional layer.

[0185] In summary, the various structures in this embodiment have clear functional divisions, are synchronously activated in terms of process response, and cooperate synergistically in the thermal-load environment, which significantly improves the fatigue durability, interface anti-peeling performance, and edge connection reliability of the honeycomb structure.

[0186] This invention provides a foam-filled honeycomb edge reinforcement structure for performing a filling method for a foam-filled honeycomb edge reinforcement structure as described in the above embodiments of this invention. The specific methods and processes for each structure in the foam-filled honeycomb edge reinforcement structure to achieve its corresponding function are detailed in the above embodiments of the foam-filled honeycomb edge reinforcement structure, and will not be repeated here.

[0187] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A honeycomb edge reinforcement structure based on expanded foam filling, disposed between a honeycomb core material and a plastic shell, with the position of the plastic shell relative to the honeycomb core material as the outer side, characterized in that, include: A roughening layer (1) is provided on the outer surface of the honeycomb core material facing the plastic shell and has grooves; Functional coating (2) covering the outer surface of roughening layer (1) includes coupling agent and / or block polymer that simultaneously crosslink with roughening layer (1) and foam filler layer (4); At least one spatial structure support (3) is disposed on the outside of the functional coating (2), and one or more foam-filled cavity areas are formed based on the spatial structure support (3), and a spatial structure support (3) is disposed on the top of each cavity area. The space structure support (3) includes: having at least one injection hole (3011); The injection positioning component (301) includes an injection hole (3011) for defining the injection position of the foam adhesive. The injection holes (3011) are arranged coaxially through the honeycomb thickness direction and distributed in a staggered array in the planar direction to form a non-overlapping arrangement structure of the injection path. Each injection hole (3011) is provided with a pressure limiting cavity (3013) and a flexible sealing plate (3014) below it. The flexible sealing plate (3014) seals the injection hole after the adhesive expands to form a self-sealing structure. A flexible positioning edge (303) is used to connect the injection-molded positioning part (301) and the rigid positioning edge (302). The rigid positioning edge (302) and the flexible positioning edge (303) together enclose the cavity area; the foam filling the cavity area constitutes the foam filling layer (4). The buffer transition layer (5) is set between the plastic shell and the outermost space structure support (3). It is a flexible buffer film with elastic modulus, serving as a transition section between the foam and the plastic shell. The foaming components, functional coating (2) and buffer transition layer (5) used in the foaming filler layer (4) complete their respective reaction or bonding processes under uniform temperature control or ultraviolet excitation conditions to construct a multi-layer composite structure interface system.

2. The honeycomb edge reinforcing structure based on foamed glue filling of claim 1, wherein, The injection-molded positioning component (301) also includes: A support anchoring structure (3012) is provided on the outer periphery of the injection hole (3011) for fixing the injection hole (3011). The pressure-limiting cavity (3013) is provided with a pressure-limiting mechanical locking part. Under the action of the pressure-limiting mechanical locking part, the flexible sealing piece (3014) is pressed into the injection hole (3011) to form a self-sealing structure.

3. The honeycomb edge reinforcing structure based on foamed glue filling of claim 1, wherein, The setting logic of the spatial architecture support (3): Step A1: Construct a finite element model of the honeycomb edge reinforcement structure and obtain the boundary conditions; the boundary conditions include honeycomb edge constraint conditions, foam expansion load constraint conditions, and plastic shell external load constraint conditions. Step A2: Perform custom mesh discretization on the honeycomb edge reinforcement structure, wherein the filling cavity area corresponding to the foam filling layer (4) is subjected to local mesh refinement to generate structural discrete units, and label the material properties of each structural discrete unit. Step A3: Based on the boundary conditions established in Step A1, the mesh model generated in Step A2, and the material property annotations, perform static finite element analysis on the honeycomb edge-reinforced structure to obtain the nodal stress response and displacement distribution of the structure under the combined action of the foam expansion internal pressure and external load, and establish the stress-displacement mapping relationship of the honeycomb structure. Step A4: Based on the nodal stress response obtained in step A3, perform eigenvalue processing on the stiffness matrix of the cellular structure to obtain the flexibility matrix of the cellular element and calculate the response sensitivity of each discrete element of the structure. Step A5: Divide the normal stress region and the concentrated stress region based on the sensitivity threshold; Multiple spatial structure supports (3) are arranged in the concentrated stress area and filled with high-density foam, while spatial structure supports (3) are arranged around the normal stress area and filled with low-density foam.

4. The honeycomb edge reinforcing structure based on foamed glue filling of claim 3, wherein, The wall thickness and area of ​​the concentrated stress area are analyzed to calculate the required number of spatial structure supports (3).

5. A honeycomb edge reinforcing structure based on foamed glue filling according to claim 4, characterized in that, The logic for obtaining the location of the injection hole (3011) is as follows: The number of spatial architecture supports (3) is determined based on the arrangement scheme of the spatial architecture supports (3), wherein the spatial architecture supports (3) are multi-layer stacked structures in the direction of honeycomb thickness; Based on the eigenvalue decomposition of the stiffness matrix of the honeycomb structure, the principal mode direction vector is extracted to determine the main axis of the glue injection path and the arrangement direction of the injection hole (3011); A foaming expansion response model was established and the colloid expansion path, local deformation and stress concentration distribution under multiple injection points were simulated. The deformation field stability coefficient under different injection point layout conditions was calculated, and the set of points with the lowest stability coefficient was selected as the injection hole layout position. Based on the multi-stage inverse finite element analysis framework, an objective function for minimizing the total strain energy of the honeycomb structure is constructed. Combining the stiffness matrix constraints and loading boundaries, the problem of injection point layout is solved in reverse to obtain the set of injection positions. The optimal solution is used for the layout of injection holes (3011) to form an ordered injection point array.

6. A honeycomb edge reinforcing structure based on foamed glue filling according to claim 5, characterized in that, The process of obtaining structural response through foam expansion response model includes: Enter the foam density, expansion ratio, and injection point location; Establish the colloidal volume growth function and the boundary force propagation function; The path tracing algorithm was used to calculate the diffusion path of different colloids. Obtain the maximum displacement and peak stress of the nodes of the structure under each injection path.

7. A filling method of a honeycomb edge reinforced structure based on foam filling, for designing the honeycomb edge reinforced structure based on foam filling according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1: Based on the preset finite element model of the honeycomb structure, extract the partition boundary information of the target cavity, establish a coordinate system for glue injection path planning, determine the injection point position and injection direction vector of the glue injection nozzle, and match the corresponding foaming glue density parameters for subsequent precise control of the filling process. S2: The glue injection nozzle performs a directional injection operation of expanding foam into the target cavity with adjustable direction, adjustable rate, and adjustable duration based on the injection point location and partition boundary information; during the glue injection process, the nozzle attitude and injection parameters are automatically adjusted according to the compliance matrix and stress gradient direction in the target cavity. S3: After the foam injection is completed, under a uniformly controlled temperature or ultraviolet excitation environment, the interface reaction between the foam and the functional coating (2), the volume expansion and shaping of the foam, and the thermal bonding process of the flexible buffer film are driven in sequence to construct a multi-layer composite structure interface system.

8. The filling method of a honeycomb edge reinforced structure based on foaming glue filling according to claim 7, characterized in that, The logic for obtaining the partition boundary information is as follows: Based on the preset finite element analysis model of the honeycomb edge reinforcement structure, a structural mesh model is established for the honeycomb core material, the spatial structure support (3) and the foam filling layer (4), the material properties of each region are labeled and the stress-displacement response data are extracted; Based on the stress-displacement response data, the conventional stress region and the concentrated stress region in the honeycomb structure are identified, and the corresponding foam filling layer (4) is marked as the target cavity. Extract the spatial distribution boundary of each target cavity. The boundary information includes the geometric shape of the area enclosed by the spatial structure support (3), stress bearing capacity and expected filling volume parameters.

9. The filling method of a honeycomb edge reinforced structure based on foaming glue filling according to claim 8, characterized in that, The injection parameters include injection direction, real-time injection rate, and injection duration; the adjustment logic for the nozzle posture and injection parameters is as follows: Calculate the stress gradient direction vector based on the stress field corresponding to the target cavity, and set the rotation angle of the injection nozzle so that the injection direction and the stress gradient direction form an angle of 10° to 30° to achieve stress-guided filling path planning. To accommodate assembly deviations in the honeycomb structure, the injection direction is provided with a posture tolerance of ±15°. The real-time injection rate is based on the baseline injection rate as the initial value and is corrected by combining the target cavity flexibility value to form a flexibility-correlated real-time injection rate. The injection duration is calculated by integrating the target injection volume with the real-time injection rate. When the injection volume reaches a preset threshold, the injection operation is automatically terminated in a closed loop.

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