CN220081860U

CN220081860U - Composite material connecting structure with embedded structure

Info

Publication number: CN220081860U
Application number: CN202320909575.XU
Authority: CN
Inventors: 李静; 洪少波; 唐虎生; 王记桓
Original assignee: China Helicopter Research and Development Institute
Current assignee: China Helicopter Research and Development Institute
Priority date: 2023-04-21
Filing date: 2023-04-21
Publication date: 2023-11-24
Anticipated expiration: 2033-04-21

Abstract

The utility model belongs to the technical field of honeycomb structures, and discloses a composite material connecting structure with an embedded structure. According to the utility model, a larger integrated structure is formed by the filler and the embedded part, the contact area of the embedded part in the loaded area of the honeycomb area is enlarged, the connection strength of the embedded part of the honeycomb sandwich composite material embedded structure is improved, the problem that the embedded part is easy to pull off is effectively avoided, the anti-extrusion strength of the contact surface of the bolt installation part is increased by adding the metal embedded part, and the extrusion strength of the connection area can be increased by at least 3 times through calculation.

Description

Composite material connecting structure with embedded structure

Technical Field

The utility model belongs to the technical field of honeycomb structures, relates to a connecting structure of a honeycomb structure, and in particular relates to a composite material connecting structure with an embedded structure.

Background

The honeycomb sandwich composite structural member has the advantages of high specific strength, high specific modulus, good fatigue resistance and corrosion resistance, good designability, capability of integrally processing and manufacturing parts, and the like. The composite material structure is widely applied in the fields of aerospace and the like, and composite material structures are increasingly used in other fields to replace traditional metal structures.

The honeycomb sandwich composite material structural member is widely applied, but the honeycomb area cannot be directly and mechanically connected and assembled with other parts, and needs to be connected with other structures through the embedded parts, and the traditional embedded filler block embedded parts are generally directly connected with the honeycomb sandwich composite material structural member through fillers, but the connection strength is limited and can only be applied to lower-strength connection conditions.

Disclosure of Invention

The purpose of the utility model is that: in order to solve the problems, the utility model provides the composite material connecting structure with the embedded structure, and the honeycomb sandwich composite material structure and the connecting structure are integrated by adopting a novel mounting mode, so that the connecting strength of the embedded part can be effectively improved.

The technical scheme of the utility model is as follows:

the utility model provides a take embedded structure's combined material connection structure, honeycomb structure's upper skin and lower skin have the through-hole that link up from top to bottom, and the honeycomb is excavated in through-hole part circumference and is formed the cavity, and columnar metal embedded part is vertical to be established in the cavity, and metal embedded part's height is the same with the honeycomb, and metal embedded part's top and bottom and through-hole position coincide, and other positions of cavity are the filler.

Further, the metal embedded part is a connecting part with an internal thread through hole at the center, the size of the internal thread through hole of the metal embedded part is the same as that of the through hole, and the position of the internal thread through hole is coincident with that of the through hole.

Further, the filler is a high strength tacky material.

Further, the radially outer side of the metal insert is provided with an extended collar.

Further, the metal insert has four convex edges, two convex edges are symmetrically arranged at the left side and the right side of the metal insert, and the other two convex edges are symmetrically arranged at the front side and the rear side of the metal insert, and the convex edges at the left side and the right side are staggered with the convex edges at the front side and the rear side at intervals.

Further, the upper skin and the lower skin are high strength composite structural panels.

The utility model has the beneficial effects that:

1. the filler and the embedded part form a larger integrated structure, so that the contact area of the embedded part in a loaded area of a honeycomb area is enlarged, the connection strength of the embedded part of the honeycomb sandwich composite material embedded structure is improved, and the problem that the embedded part is easy to pull off is effectively avoided;

2. by adding the metal insert, the compressive strength of the contact surface at the bolt mounting location is increased, and the compressive strength of the connection area can be increased by at least 3 times through calculation.

3. The honeycomb structure and the inserts of the present utility model are connected in such a manner that the loaded area is primarily a high strength composite skin area, avoiding crushing of the fragile honeycomb.

4. The structure of the utility model has good designability, can be applied to honeycomb sandwich composite material structures with different material forms and different honeycomb heights, has good adaptability, and can be widely applied to the honeycomb sandwich composite material structures.

Drawings

FIG. 1 is a schematic view of a composite material connection structure with an embedded structure according to the present utility model;

FIG. 2 is a schematic illustration of the present utility model without an insert;

FIG. 3 is a schematic view of a metal insert according to the present utility model;

FIG. 4 is a schematic cross-sectional view of a metal insert according to the present utility model;

wherein, 1-upper skin, 2-honeycomb, 3-lower skin, 4-filler, 5-metal inserts, 5A-insert bolt mounting holes, 5B-insert ears, 11-bolt mounting holes, 12-honeycomb insert mounting holes.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a take embedded structure's combined material connection structure, honeycomb structure's upper skin 1 and lower skin 3 have the through-hole that link up from top to bottom, and honeycomb 2 digs in through-hole part circumference and forms the cavity, and columnar metal insert 5 is vertical to be established in the cavity, and metal insert 5 highly is the same with honeycomb 2, and metal insert 5's top and bottom and through-hole position coincide, and other positions of cavity are filler 4.

The metal insert 5 is a connecting piece with an internal thread through hole in the center, the size of the internal thread through hole of the metal insert 5 is the same as that of the through hole, and the position of the internal thread through hole is coincident with that of the through hole.

The filler 4 is a high strength tacky material.

The radially outer side of the metal insert 5 is provided with protruding rims.

The metal insert 5 has four convex edges, two convex edges are symmetrically arranged on the left side and the right side of the metal insert 5, and the other two convex edges are symmetrically arranged on the front side and the rear side of the metal insert 5, and the convex edges on the left side and the right side are staggered with the convex edges on the front side and the rear side at intervals.

The upper skin 1 and the lower skin 2 are high strength composite structural panels.

Specific structural embodiments of the present utility model are described below with reference to the accompanying drawings.

A novel composite material connection structure with an embedded structure comprises an upper skin 1, a honeycomb 2, a lower skin 3, a filler 4, a metal embedded part 5 and the like which form a honeycomb interlayer composite material embedded structural member. The metal embedded part 5 is not installed, the honeycomb sandwich composite material structural member is a conventional honeycomb sandwich composite material structure consisting of an upper skin 1, a honeycomb 2 and a lower skin 3, bolt installation holes are formed in the upper skin 1 and the lower skin 2 and are slightly larger than the bolt installation holes 5A of the embedded part, and a placement area with the diameter larger than the maximum diameter of the embedded part 5 is dug in a honeycomb area and used for placing the embedded part 5. After the embedded part is placed, the area except the embedded part of the placement area of the embedded part is filled with high-strength sticky filler 4, the filler 4 and the metal embedded part 5 form a whole, the contact area between the embedded part area and the skin and the honeycomb is enlarged, and the bearing strength is improved. Other structures will be bolted to the insert bolt mounting holes 5A in the honeycomb sandwich composite structure metal insert structure 5 in such a way that the loaded area is mainly a high strength composite skin area, avoiding crushing of the fragile honeycomb.

According to the utility model, the anti-extrusion strength of the contact surface of the bolt mounting part is increased by adding the metal embedded part, and meanwhile, as the metal embedded part is added with 4 protruding lugs 5B, the area of the filler for transmitting load is increased, and the strength of the out-of-plane load of the joint of the J structure of the composite material is increased.

As shown in fig. 1, an upper skin 1, a honeycomb 2, a lower skin 3, a filler 4, a metal insert 5, and the like constitute a honeycomb sandwich composite material insert structure. The upper skin 1 and the lower skin 3 are high-strength composite material structural plates paved by glass fiber cloth, carbon fiber cloth or fiber cloth of other materials, have strong strength and rigidity, and the honeycomb 2 can be a conventional hexagonal paper honeycomb, an aluminum honeycomb or other honeycombs, or can be other light materials such as foam; the filler 4 is a flowable adhesive material that can be cured into a unitary structure with the metal insert 5.

The honeycomb sandwich composite structure without metal inserts is a conventional honeycomb sandwich composite structure consisting of an upper skin 1, honeycomb 2, and a lower skin 3 as shown in fig. 2. The upper and lower skins are provided with bolt mounting holes 11, and the diameters of the holes are slightly larger than the diameters of the connecting bolts selected for the holes; the honeycomb area is dug out of a placement area with the diameter larger than the maximum diameter of the metal insert 5, and the placement area is a metal insert placement hole 12, and the honeycomb boundary at the hole is at least required to be at least two honeycomb distances from the outer boundary of the insert, so that the filler and the honeycomb can be well fused together, and the fragile honeycomb is prevented from being damaged by the hard metal insert.

During manufacturing, the lower skin 3 is firstly stuck to the die surface, then the prefabricated honeycomb 2 is placed, the metal inserts 5 are placed, the filler 4 is filled after the metal inserts are fixed, and the upper skin 1 is paved after the filler is solidified. After the paving is finished, the bolt mounting primary holes are added on the inner skin and the outer skin, then the bolts are positioned by pins with the same diameter as the embedded part bolt mounting holes 5A, and finally the bolts are fed into a furnace for curing.

The embedded part shown in fig. 3 and 4 has an I-shaped column-like structure, and is provided with an ear 5B with a large diameter in the middle, and the middle has a small diameter, so that the embedded part and the filler form a firm integrated structure; the 5A area is an embedded part inner bolt mounting hole and is a through hole, reaming can be carried out according to actual matching requirements, and simultaneously, the diameter, the length and the thickness of the bolt connected with the 5A area can be selected according to the load condition connected with other structures. The metal insert 5 is only used as a preferred embodiment for explaining the present utility model and should not be construed as limiting the present utility model to only this structural form of insert.

The foregoing is merely a detailed description of the utility model, which is not a matter of routine skill in the art. However, the scope of the present utility model is not limited thereto, and any changes or substitutions that can be easily contemplated by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model. The protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The composite material connecting structure with the embedded structure is characterized in that an upper skin (1) and a lower skin (3) of the honeycomb structure are provided with through holes which are penetrated up and down, a honeycomb (2) is hollowed out in the circumferential direction of the through hole part to form a cavity, a columnar metal embedded part (5) is vertically arranged in the cavity, the height of the metal embedded part (5) is the same as that of the honeycomb (2), the top end and the bottom end of the metal embedded part (5) are overlapped with the positions of the through holes, and other positions of the cavity are all filled with a filler (4); the radial outer side of the metal embedded part (5) is provided with an extended convex edge; the metal insert (5) has four convex edges, two convex edges are symmetrically arranged on the left side and the right side of the metal insert (5), and the other two convex edges are symmetrically arranged on the front side and the rear side of the metal insert (5), and the convex edges on the left side and the right side are staggered with the convex edges on the front side and the rear side at intervals.

2. The composite material connecting structure with the embedded structure according to claim 1, wherein the metal embedded part (5) is a connecting part with an internal threaded through hole in the center, the size of the internal threaded through hole of the metal embedded part (5) is the same as that of the through hole, and the position of the internal threaded through hole is coincident with that of the through hole.

3. A composite material connection with embedded structure according to claim 1, characterized in that the filler (4) is a high-strength, adhesive material.

4. A composite material connection with embedded structure according to claim 1, characterized in that the upper skin (1) and the lower skin (3) are high strength composite material structural panels.