CN211852482U - Connecting structure of composite material rod piece and metal joint - Google Patents
Connecting structure of composite material rod piece and metal joint Download PDFInfo
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- CN211852482U CN211852482U CN201921964054.4U CN201921964054U CN211852482U CN 211852482 U CN211852482 U CN 211852482U CN 201921964054 U CN201921964054 U CN 201921964054U CN 211852482 U CN211852482 U CN 211852482U
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Abstract
The utility model discloses a connection structure of combined material member and metal joint belongs to the structural strength field. In the connecting structure, the composite material rod piece comprises a composite material hollow inner cylinder and a composite material hollow outer cylinder, and the metal joint is of a hollow structure and comprises a hollow metal joint and a hollow metal joint; the composite material hollow outer barrel is characterized by comprising an end connecting part and a cylindrical stepped connection area, wherein the cylindrical stepped connection area comprises an arc connection area and a platform connection area, and the platform connection area and the arc connection area are respectively attached to the composite material hollow inner barrel and the composite material hollow outer barrel. The utility model discloses technical scheme is applicable to the pole class structure of being connected with metal joint with bearing the combined material cavity section of thick bamboo section that axial load such as tensile, compression are given first place to, can bear several tons to several hundred tons of pulling and pressing load, compares in metal pole class structure, when satisfying the performance requirement, can obtain good heavy effect that subtracts.
Description
Technical Field
The utility model belongs to the structural strength field, concretely relates to connection structure of combined material member and metal joint.
Background
The engine hanger is a main bearing part of the airplane and can be divided into a central box section, an upper fairing and a rear fairing grade part. The hanging box section is of a beam type frame structure and is used for connecting the engine and the wing. For a statically indeterminate structural hanger box, the lower connecting rod is generally used for connecting the hanger and the lower wing surface of the wing, and is mainly used for transmitting the thrust of the engine and bearing the tension and compression load, as shown in fig. 1. The connecting rod scheme under the traditional airplane design mostly adopts the metal connecting rod and metal joint all-in-one machine addition molding, the used materials comprise titanium alloy and high-strength steel, and the specific scheme needs to be determined according to the design characteristics and requirements of the airplane type and the manufacturing capacity of suppliers. Compared with the traditional hanging lower connecting rod design, the design scheme of the composite rod piece and the metal joint can reduce weight by 35-80% for the wing-hung engine airplane, and has great potential benefits. At present, the boeing 787 aircraft suspension lower connecting rod adopts a composite material design scheme, and a connector adopts titanium alloy, so that a good use effect is obtained.
The connection between the composite connecting rod and the metal joint is the key and difficult point of the design of the lower connecting rod for hanging the composite material. At present, most of aviation composite material structural parts are planar or large-curved-surface type plate structures, and for the structures, both design analysis methods and manufacturing processes are mature. However, the research on the rod-type composite material structure is very little, and particularly, the rod-type composite material structure capable of bearing huge tensile and compressive loads is lack of design analysis methods and manufacturing processes for reference. How to break through the connection technology between the composite material connecting rod and the metal joint in the aspects of design and manufacturing process is a key ring for completing the design and verification of the composite material connecting rod.
The form of joining of the composite structure to the metal structure typically includes both adhesive bonding and mechanical joining. Because the load transferred by the connecting rod is high, the glue joint can not meet the requirement; if a mechanical connection is used (as shown in fig. 2), the accessibility of the composite material rod piece is poor, so that the composite material rod piece can be only installed on one side by rivets, and the assembly and the inspection have more problems.
In the prior art, Boeing company applied a Patent "Composite base structure and end fitting joint and method" (Patent Number:4,469,730) in 1984, and the tensile load between a Composite rod and a metal joint is converted into a hoop load, i.e., a carbon fiber tension load of 90 °, and the compressive load is transmitted through the contact surface between the Composite and the metal, as shown in FIG. 3.
The scheme has obvious defects in the process of transferring the compression load, the outer performance of the composite material is poor, and if the compression load is transferred by the contact of the cross section of the composite material and the metal joint, the composite material is easy to crush, so that the structural failure is caused. In addition, the scheme does not consider the problem of structure relaxation possibly caused by the moisture absorption and aging of the composite material.
The roll-Royce company, in 2014, applied for the patent "Method for manufacturing a draft of an agas-turbine engine, in a particulate a radial draft or a draft associated with a turbine to the turbine axis" (US2014130964), proposes a connection scheme of a composite turbine shaft and a metal joint, as shown in FIGS. 4a-4 b. According to the scheme, the inner metal joint and the outer metal joint in a spline form are designed, the composite material prepreg is laid on the inner metal joint, and then the outer metal joint is connected to compact the composite material into the spline, so that torque is transmitted. The scheme is a torque transmission shaft design, and the tension and compression load transmission capacity is insufficient.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a connection structure of combined material member and metal joint is applicable to the pole class structure that is connected with metal joint in order to bear axial load such as tensile, compression as main combined material cavity section of thick bamboo section, can bear several tons to several hundred tons of pulling and pressing load, compares in metal pole class structure, when satisfying the performance requirement, can obtain good the heavy effect that subtracts.
According to the technical scheme of the utility model, a connecting structure of a composite material rod piece and a metal joint is provided, wherein,
the composite material rod piece comprises a composite material hollow inner cylinder and a composite material hollow outer cylinder,
the metal joint is hollow structure, includes: the composite material hollow outer barrel is characterized by comprising an end connecting part and a cylindrical stepped connection area, wherein the cylindrical stepped connection area comprises an arc connection area and a platform connection area, and the platform connection area and the arc connection area are respectively attached to the composite material hollow inner barrel and the composite material hollow outer barrel.
Further, the cylindrical stepped connection region is a two-step cylindrical structure including a first outer diameter portion and a second outer diameter portion, and the outer diameter of the first outer diameter portion is smaller than the outer diameter of the second outer diameter portion.
Further, the outer surface of the first outer diameter portion is a land area.
Furthermore, the second outer diameter part is a pressure-bearing stop plate, and the pressure-bearing stop plate is in butt joint with the composite material hollow inner cylinder attached to the platform connecting area.
Further, the outer surface of the pressure-bearing stop plate is an arc-shaped connecting area.
Furthermore, a plurality of anti-rotation/anti-sliding platforms are arranged on the arc-shaped connecting area and the platform connecting area.
Further, the arc-shaped connecting area comprises a straight area and an arc-shaped area, the straight area is arranged close to the end head connecting part, and the outer diameter of the straight area is unchanged; the arc-shaped area is close to the composite material hollow inner cylinder attached to the platform connection area, and the outer diameter of the arc-shaped area is gradually increased along the direction towards the composite material hollow inner cylinder.
Furthermore, the cylindrical stepped connection area is subjected to texturing treatment so as to increase the bonding force with the composite rod piece.
The utility model has the advantages that:
according to the technical scheme of the utility model in, when the structure bore tensile load, produce the relative displacement trend between metal joint and combined material cavity inner tube, the combined material cavity urceolus, wherein, because of combined material cavity urceolus is tightly pressed from both sides the hoop on metal joint by 90 shop's layers in the arc joining region, with the help of the ladder that the pressure-bearing barrier plate constitutes, combined material cavity urceolus has transmitted most tensile load with metal joint arc joining region part simultaneously. When the structure bears the compression load, the existence of the pressure-bearing baffle plate on the metal joint enables the compression load to be more easily transmitted to the composite material hollow inner cylinder through the pressure-bearing baffle plate, so that the composite material hollow inner cylinder bears most of the compression load.
Drawings
FIG. 1 shows a schematic view of an engine nacelle construction;
FIG. 2 is a schematic view illustrating a mechanical connection scheme of a composite connecting rod and a metal joint in the prior art;
FIG. 3 shows a schematic diagram of the Boeing company patent scheme;
FIGS. 4a to 4b show schematic diagrams of the Rolls-Royce turbine shaft scheme;
fig. 5 shows a schematic structural view according to the technical solution of the present invention;
fig. 6 shows a schematic view of a metal joint structure according to the present invention;
fig. 7 shows a schematic structural diagram of a composite hollow inner cylinder according to the technical solution of the present invention;
FIG. 8 is a schematic view showing the application of a composite hollow inner barrel to a metal joint;
fig. 9 shows a schematic representation of a co-cured structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in order to provide the public with a better understanding of the present invention, some details of the specific structure are set forth in the following description of the invention. It will be apparent to one skilled in the art that an understanding of the present invention may be practiced without these specific details.
The utility model provides a novel composite material cavity section of thick bamboo section and metal joint's connection structure, as shown in fig. 5, mainly include composite material cavity inner tube (1), urceolus (2) and metal joint (3).
The metal joint (3) is of a hollow structure, and is attached to the sections of the composite material inner cylinder (1) and the composite material outer cylinder (2) through a platform connecting area (4) and an arc connecting area (5) as shown in figure 6.
The metal and composite material connecting area can be subjected to texturing treatment and is used for increasing the friction coefficient between the metal and composite material connecting area and the outer surface of the composite material rod piece and avoiding the movement between the metal and composite material connecting area and the outer surface of the composite material rod piece; in addition, a plurality of anti-rotation/anti-sliding platforms (7) are arranged on the platforms and the arc-shaped connecting area of the metal joint and used for preventing the composite materials from rotating relatively in the winding process.
And the metal joint (3) is provided with a pressure-bearing baffle plate (6) which is connected with the end part of the section of the composite material inner cylinder (1) to ensure that the compression load is directly transmitted to the composite material inner cylinder (1). The composite hollow inner cylinder (1) is mainly formed by a layer which is arranged in a 0-degree direction and parallel to a cylinder shaft, can be paved by winding, manual paving and other processes, is bonded with the metal joint (3) through a platform connecting area (4) after being pre-cured, then is paved with the composite outer cylinder (2) by the winding, manual paving and other processes, and finally is solidified together to form a composite hollow cylinder section and metal joint connecting product, wherein the composite hollow cylinder section and the metal joint connecting product are mainly connected through an arc connecting area (5). Wherein, the composite outer cylinder (2) is mainly composed of 0-degree-direction laying layers parallel to the cylinder axis, but 90-degree-direction laying layers are additionally added in the arc-shaped connecting area (5) to ensure that the 0-degree-direction laying layers are tightly attached to the surface of the metal platform.
When the structure bears tensile load, relative displacement trend is generated among the metal joint (3), the composite hollow inner cylinder (1) and the composite hollow outer cylinder (2), wherein the composite hollow outer cylinder (2) is tightly clamped on the metal joint by 90-degree layering in an arc-shaped connection area (5), and meanwhile, most of tensile load is transmitted between the composite hollow outer cylinder and the arc-shaped connection area of the metal joint by means of a step formed by pressure bearing group baffles. When the structure bears the compression load, the existence of the pressure-bearing stop plate on the metal joint enables the compression load to be more easily transmitted to the composite material inner cylinder (1) through the pressure-bearing stop plate, so that most of the compression load is borne by the composite material inner cylinder (1).
The assembly process of the structure is as follows:
a) and (3) processing the metal joint, wherein the step connecting area can be subjected to texturing treatment so as to increase the adhesion force with the composite material.
b) Preparing a composite hollow inner cylinder section, and paving the composite hollow inner cylinder section by using processes such as winding, manual paving and the like through a core mould so as to perform precuring and forming; because the inner cylinder section layer is subjected to tension and compression loads, the inner cylinder section layer is mainly a 0-degree direction layer parallel to the axial direction. The structure is shown in fig. 7.
c) The composite hollow inner cylinder section is bonded with the metal joint through the platform connecting area and is attached to the platform connecting area (4), and the attaching process is shown in fig. 8.
d) And connecting the composite hollow outer cylinder, the composite hollow inner cylinder and the metal joint.
The product after the composite hollow inner cylinder and the metal joint are connected is taken as a mould, and the composite outer cylinder is paved by using the processes of winding, manual paving and the like. Wherein the composite outer cylinder still comprises a 0-degree direction layer parallel to the cylinder axis, but a 90-degree direction layer is additionally added in the arc-shaped connection area to ensure that the 0-degree direction layer is tightly attached to the surface of the metal platform. After all the layups are complete, the entire barrel section is co-cured together and the structure is shown in FIG. 9.
The utility model provides a novel connection scheme of new combined material member and metal joint can be applied to the pole class structure of combined material section of thick bamboo section and metal joint connection who is given first place to bearing axial load such as tensile, compression, connecting rod, undercarriage bearing diagonal post, central spar pillar etc. about hanging the engine like the wing.
The scheme is suitable for rod structures which are mainly used for bearing axial loads such as tension and compression and are formed by connecting composite material hollow cylinder sections with metal joints, for example, hyperstatic hanging upper and lower pull rods of a wing-hung engine, a central spar support, an undercarriage oblique support and the like.
While embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above-described embodiments are merely exemplary and should not be taken as limiting the scope of the invention.
Claims (8)
1. A connecting structure of a composite material rod piece and a metal joint is characterized in that,
the composite material rod piece comprises a composite material hollow inner cylinder and a composite material hollow outer cylinder,
the metal joint is hollow structure, includes: the composite material hollow outer barrel is characterized by comprising an end connecting part and a cylindrical stepped connection area, wherein the cylindrical stepped connection area comprises an arc connection area and a platform connection area, and the platform connection area and the arc connection area are respectively attached to the composite material hollow inner barrel and the composite material hollow outer barrel.
2. The connection structure of claim 1, wherein the cylindrical stepped connection region is a two-step cylindrical structure comprising a first outer diameter portion and a second outer diameter portion, the first outer diameter portion having an outer diameter smaller than an outer diameter of the second outer diameter portion.
3. The connection according to claim 2, wherein an outer surface of the first outer diameter portion is a plateau connection region.
4. The connection according to claim 2, wherein the second outer diameter portion is a compression stop plate, and the compression stop plate is butted against a composite hollow inner cylinder attached to the platform attachment area.
5. The connection structure as claimed in claim 4, wherein the outer surface of the compression stop plate is an arc-shaped connection region.
6. The connection according to claim 1, wherein a plurality of anti-rotation/anti-slip platforms are provided on the arc-shaped connection region and the platform connection region.
7. The connection according to claim 1, wherein the arc-shaped connection region includes a straight region and an arc-shaped region, the straight region being disposed adjacent to the end connection portion and having a constant outer diameter; the arc-shaped area is close to the composite material hollow inner cylinder attached to the platform connection area, and the outer diameter of the arc-shaped area is gradually increased along the direction towards the composite material hollow inner cylinder.
8. The connection according to claim 1, wherein the cylindrical stepped connection region is a textured cylindrical stepped connection region to increase adhesion to the composite rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921964054.4U CN211852482U (en) | 2019-11-14 | 2019-11-14 | Connecting structure of composite material rod piece and metal joint |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921964054.4U CN211852482U (en) | 2019-11-14 | 2019-11-14 | Connecting structure of composite material rod piece and metal joint |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112478124A (en) * | 2020-11-24 | 2021-03-12 | 航天特种材料及工艺技术研究所 | High-bearing airfoil joint load transmission structure |
| CN113719519A (en) * | 2021-08-18 | 2021-11-30 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Rod piece structure for connecting composite material and metal joint |
-
2019
- 2019-11-14 CN CN201921964054.4U patent/CN211852482U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112478124A (en) * | 2020-11-24 | 2021-03-12 | 航天特种材料及工艺技术研究所 | High-bearing airfoil joint load transmission structure |
| CN113719519A (en) * | 2021-08-18 | 2021-11-30 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Rod piece structure for connecting composite material and metal joint |
| CN113719519B (en) * | 2021-08-18 | 2022-07-05 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Rod piece structure for connecting composite material and metal joint |
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