CN112722232B - Triangular-section arc-shaped composite material truss and preparation method thereof - Google Patents
Triangular-section arc-shaped composite material truss and preparation method thereof Download PDFInfo
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- CN112722232B CN112722232B CN202011469424.4A CN202011469424A CN112722232B CN 112722232 B CN112722232 B CN 112722232B CN 202011469424 A CN202011469424 A CN 202011469424A CN 112722232 B CN112722232 B CN 112722232B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/06—Frames; Stringers; Longerons ; Fuselage sections
- B64C1/061—Frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64B—LIGHTER-THAN AIR AIRCRAFT
- B64B1/00—Lighter-than-air aircraft
- B64B1/06—Rigid airships; Semi-rigid airships
- B64B1/08—Framework construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The invention discloses an arc-shaped composite truss with a triangular cross section, which is characterized in that an outer chord member, a first inner chord member and a second inner chord member which are parallel to each other are connected through a web member component with the triangular cross section to form an arc-shaped three-dimensional structure, a first outer oblique web member, a second outer oblique web member and an inner oblique web member are respectively arranged at the opposite angles of the outer chord member, the first inner chord member and the second inner chord member between the adjacent web members with the triangular cross section and are fixedly connected with a four-way joint, and each member is made of carbon fiber composite material; the invention also discloses a preparation method of the triangular section arc-shaped composite material truss. The large-radian composite material truss structure with curvature is formed by connecting the web members with the triangular sections through the web members, the size precision is high, the load performance is good, the truss structure realizes ultra-light weight, and the modular connection of the large-scale composite material pipe truss is realized; the invention adopts the self-heating mould for preparation, does not need to enter and exit the curing equipment, and improves the quality stability and the dimensional accuracy of the arc rod piece.
Description
Technical Field
The invention belongs to the technical field of composite material structures, and particularly relates to an arc-shaped composite material truss with a triangular cross section and a preparation method thereof.
Background
The main body of the truss structure is formed by connecting truss rods and truss joints, the weight of the members is reduced mainly by coordinately distributing load acting force on each rod, and through optimized design, the structure can be designed into a stretching dominant mechanical stress state, so that the minimum weight index under the same load can be obtained. The carbon fiber composite material has the comprehensive excellent characteristics of small specific gravity, high specific strength and specific modulus, good moisture resistance, fatigue resistance, good wear resistance and the like, and meanwhile, the carbon fiber composite material has good designability and the like.
The truss structure and the carbon fiber composite material have many advantages, and the truss structure made of the carbon fiber composite material is one of important development trends of the supporting structure of the large-scale spacecraft in the future. In modern airships, triangular section trusses are still common as the basic structural form of the airship. The structure is required to be lightweight, and most of the structure is of an arc curved surface streamline structure.
A concept of Iso Truss structure is disclosed in the Collection of Technical applicators-AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, v1, p562-571,2001, wherein linear trusses with excellent mechanical properties can be conceptually formed by connecting longitudinal bars and spiral diagonal bars to form equilateral triangles, but the structure is very complicated, requires integral winding and forming, and cannot form the structure of the curved composite Truss.
Chinese patent document CN101418627A discloses an ultra-light full composite truss and a preparation method thereof, the composite comprises more than three axial composite rods and a plurality of circumferential ribs and spiral cross ribs, the preparation method forms the full composite truss after sequentially fixing a core mold, winding the core mold, binding, heating, curing and demolding, but the truss is a linear truss structure and is not suitable for curved surface type framework structures such as aerostats, and meanwhile, the preparation process is complex, the forming efficiency is low, and the geometric accuracy is not sufficient.
Bear wave's analysis of bearing performance of composite truss with long and narrow configuration with triangular cross section' (academic paper of Harbin university of industry, 2012) developed a composite truss structure with long triangular cross section and narrow configuration with specification of 3m long, 0.5m pitch length and 0.26m side length of equilateral triangle, and analyzed the bearing performance. The structure adopts a scheme of intersecting nodes of three-side forward spiral web members, 5-way and 6-way, but the overlapped parts of the limb pipes are more, so that the manufacture is difficult to realize, and therefore, only a DragonPlate node is adopted to splice a 1.5m truss, and the bearing test research is carried out. Meanwhile, the truss structure is in a linear form and is not suitable for curved surface type framework structures such as aerostats, the truss joint is cemented by a thin shell, the outer layer is wound by fibers, and finally, the truss joint is molded by pressing and curing by a mold, so that the molding process is complex and the efficiency is low.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a composite truss with an arc-shaped triangular cross section, which is in view of the above-mentioned deficiencies of the prior art. The truss is connected along the same direction through the outer chord members, the first inner chord member and the second inner chord member which are parallel to each other, and the web member assembly with the triangular cross section is connected along the same direction to form a large-radian composite truss structure with curvature, so that the size precision is high, the load performance is good, the truss structure is ultra-light, a main truss with an arc-shaped curved surface structure or an annular structure is obtained through splicing, the modular connection of large composite pipe trusses is realized, and the truss is suitable for structural members of aviation and aerospace aircrafts.
In order to solve the technical problems, the invention adopts the technical scheme that: a triangular section arc-shaped composite material truss is characterized by comprising outer chords, first inner chords and second inner chords which are parallel to each other, wherein the outer chords, the first inner chords and the second inner chords are connected in the same direction through uniformly arranged triangular section web member assemblies to form an arc-shaped three-dimensional structure, each triangular section web member assembly is formed by connecting 3 web members in pairs through 3 four-way joints, first outer oblique web members are arranged on the outer chords and the first inner chords between the adjacent triangular section web member assemblies in opposite angles, the adjacent first outer oblique web members are arranged in a staggered manner, second outer oblique web members are arranged on the outer chords and the second inner chords between the adjacent triangular section web member assemblies in opposite angles, the first inner chords and the second inner chords between the adjacent triangular section web member assemblies are arranged in opposite angles, and adjacent interior oblique web member is crisscross to be set up, and first outer oblique web member, the outer oblique web member of second and interior oblique web member are two liang of crisscross settings in the unit structure that adjacent triangle-section web member subassembly formed, and just first outer oblique web member, the outer oblique web member of second and interior oblique web member all adopt carbon fiber composite through fixed subassembly and cross joint fixed connection, outer chord member, first interior chord member, second interior chord member, triangle-section web member subassembly, first outer oblique web member and the outer oblique web member of second all adopt carbon fiber composite.
The triangular-section arc-shaped composite material truss is characterized in that the four-way joint comprises a body, a first joint and a second joint which are arranged at two ends of the body and are arranged on the same plane, and a third joint and a fourth joint which are symmetrically arranged at two sides of the lower portion of the body.
The triangular-section arc-shaped composite material truss is characterized in that supporting lugs are arranged on the outer side faces of the first joint and the second joint, and connecting holes are formed in the supporting lugs.
The triangular-section arc-shaped composite truss is characterized in that the first outer oblique web member, the second outer oblique web member and the inner oblique web member are the same in structure and comprise rod bodies, the two ends of the rod bodies are provided with the inner inserting connectors, the inner inserting connectors are symmetrically provided with matching holes, and the inner inserting connectors between the matching holes are provided with symmetrical clamping grooves.
The arc-shaped composite material truss with the triangular cross section is characterized in that a reinforcing wall is arranged on the outer surface of the body of the four-way joint.
The arc-shaped composite material truss with the triangular cross section is characterized in that 3 web members in the web member assembly with the triangular cross section are composed of inner insertion tubes and reinforcing sleeves sleeved on the outer surfaces of the inner insertion tubes, and two ends of each inner insertion tube are connected with four-way joints respectively.
The arc-shaped composite material truss with the triangular cross section is characterized in that the web member assembly with the triangular cross section is of an integral equilateral triangle structure.
In addition, the invention also provides a method for preparing the arc-shaped composite truss with the triangular cross section, which is characterized in that the method for preparing the outer chord, the first inner chord and the second inner chord in the arc-shaped composite truss with the triangular cross section comprises the following steps: the surface of the Baolilong foam inner die is coated with a nylon air bag to form a soft inner die, then epoxy resin high-strength carbon fiber prepreg is flatly laid on the surface of the soft inner die according to a designed layer laying structure to form a prefabricated body, then the prefabricated body is placed in a lower die cavity of an outer die, an upper die is closed and fastened, after pressurizing to 0.8-1.1 MPa, heating, heat preservation, pressure maintaining, curing and forming are carried out, and after cooling, demoulding is carried out.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the outer chord member, the first inner chord member and the second inner chord member which are parallel to each other are connected in the same direction through the uniformly arranged web members with the triangular cross sections to form an arc three-dimensional structure, so that the arc composite truss with the triangular cross sections has a certain arc center included angle, and a main truss with an arc curved surface structure or a circumferential structure is obtained through splicing, so that the modular connection of the large composite pipe truss is realized, and the large composite pipe truss is suitable for structural members of aviation and aerospace aircrafts.
2. According to the invention, the first outer diagonal web member, the second outer diagonal web member and the inner diagonal web member in the triangular section web member assembly form an integral structure through the four-way joint, a metal connecting piece is not needed, the connecting section is large, the rigidity of the integral structure is high, and the triangular section web member assembly is formed on the fixing tool, so that the geometric dimension precision of the truss is improved, and the integral bearing efficiency of the truss is improved.
3. According to the truss, the first outer diagonal web member, the second outer diagonal web member and the inner diagonal web member are respectively provided with the inner inserting joint at two ends, are connected with the four-way joint in an inserting and hinging manner, and are combined with axial bonding, so that the strength influence of a hinge hole on a rod body is effectively reduced, the rigidity of a connecting part is improved, the tensile deformation is avoided, and the tensile load is increased.
4. According to the triangular-section arc-shaped composite truss, the main structures such as the rod piece, the four-way joint and the like in the triangular-section arc-shaped composite truss are all made of carbon fiber composite materials to replace common aluminum alloy materials, so that the weight of the truss is effectively reduced, the strength of the truss is improved, the truss has the characteristics of large specific strength and specific rigidity, light weight and good bearing performance, all performance indexes meet the design index requirements, and the ultra-light weight of the truss structure is realized.
5. Compared with the conventional triangular section truss structure, the truss structure of the composite material with large radian and curvature is realized, and the truss structure has larger popularization and application space for aerostats such as airship and the like, arc-shaped curved surface structures or similar structures of aviation and aerospace aircrafts, unmanned aerial vehicle structures, arc-shaped curved surface structures in other fields and the like.
6. According to the invention, the carbon fiber prepreg mould pressing and internal filling pressure integrated integral in-situ forming process is adopted to prepare the large-size arc-shaped rod pieces such as the outer chord member, the first inner chord member and the second inner chord member, and the self-heating mould is adopted, so that the repeated transportation is avoided, the quality stability and the size precision of the prepared arc-shaped rod pieces are high, the production efficiency is improved, and the production cost is lower.
7. The invention has the advantages of low preparation cost, good use effect, convenient popularization and use, and larger application value and economic benefit.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of an arc-shaped composite truss with a triangular cross section according to the invention.
Fig. 2 is a schematic structural view of a web member assembly of triangular cross section according to the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 2.
FIG. 4 is a schematic structural view of a four-way joint of the present invention.
Fig. 5 is a schematic structural view of the first outer diagonal web member, the second outer diagonal web member and the inner diagonal web member of the present invention.
FIG. 6 is a schematic structural diagram of an interposer connector according to the present invention.
FIG. 7 is a flow chart of a forming process of an arc tube in the triangular section arc composite truss according to the invention.
Description of reference numerals:
1-outer chord; 2-1 — a first inner chord; 2-a second inner chord;
3-a web member assembly with a triangular cross section; 3-1-four-way joint; 3-1-first linker;
3-1-2-second linker; 3-1-3-a third linker; 3-1-4-fourth linker;
3-1-5-lugs; 3-1-6-connecting hole; 3-1-7-a reinforcing wall;
3-2-inner intubation; 3-reinforcing sleeve; 4-1 — a first externally diagonal web member;
4-2-second external diagonal web members; 4-3-inner diagonal web member; 5, connecting the components;
6-rod body; 7-inserting a joint; 7-1-mating holes;
7-2-card slot.
Detailed Description
Example 1
As shown in fig. 1, the triangular section arc-shaped composite truss of the embodiment includes an outer chord member 1, a first inner chord member 2-1 and a second inner chord member 2-2 which are parallel to each other, the outer chord member 1, the first inner chord member 2-1 and the second inner chord member 2-2 are connected in the same direction through a uniformly arranged triangular section web member assembly 3 to form an arc-shaped three-dimensional structure, the triangular section web member assembly 3 is formed by connecting 3 web members in pairs through 3 four-way joints 3-1, first outer diagonal web members 4-1 are arranged diagonally between the outer chord member 1 and the first inner chord member 2-1 between adjacent triangular section web member assemblies 3, the adjacent first outer diagonal web members 4-1 are arranged alternately, and second outer diagonal web members 4-2 are arranged diagonally between the outer chord member 1 and the second inner chord member 2-2 between the adjacent triangular section web member assemblies 3, the adjacent second outer oblique web members 4-2 are arranged in opposite directions, the first inner chord member 2-1 and the second inner chord member 2-2 between the adjacent web member assemblies 3 with triangular sections are provided with inner oblique web members 4-3 in opposite angles, the adjacent inner oblique web members 4-3 are arranged in a staggered way, the first outer oblique web member 4-1, the second outer oblique web member 4-2 and the inner oblique web member 4-3 in the unit structure formed by the adjacent web members 3 with the triangular cross sections are arranged in a staggered way in pairs, and the first outer diagonal web member 4-1, the second outer diagonal web member 4-2 and the inner diagonal web member 4-3 are fixedly connected with the four-way joint 3-1 through the fixing component 5, the outer chord member 1, the first inner chord member 2-1, the second inner chord member 2-2, the triangular section web member assembly 3, the first outer oblique web member 4-1 and the second outer oblique web member 4-2 are all made of carbon fiber composite materials.
The outer chord members 1, the first inner chord members 2-1 and the second inner chord members 2-2 which are parallel to each other in the triangular-section arc-shaped composite material truss are connected in the same direction through the uniformly arranged triangular-section web member assemblies 3 of which the number is usually 3-6 to form an arc three-dimensional structure, so that the triangular-section arc-shaped composite material truss has a certain arc center included angle, a plurality of triangular-section arc-shaped composite material trusses can be spliced and combined according to the arc center included angle according to the requirements of use purposes, a main body truss with an arc curved surface structure or a circumferential structure is obtained, modular connection of large-scale composite material pipe truss frames is achieved, transition transportation is facilitated, the practicability and the universality are higher, and the large-scale composite material pipe truss is suitable for structural members of aviation and aerospace aircrafts; secondly, the first outer diagonal web member 4-1, the second outer diagonal web member 4-2 and the inner diagonal web member 4-3 of the present embodiment form an integral structure through the four-way joint 3-1, no metal connecting piece is required, the connecting section is large, and the rigidity of the integral structure is high; meanwhile, the main structure of the truss, such as the rod piece, the four-way joint and the like, is made of carbon fiber composite materials instead of common aluminum alloy materials, so that the weight of the truss is effectively reduced, the strength of the truss is improved, the truss has the characteristics of large specific strength and specific rigidity, light weight and good bearing performance, all performance indexes meet the design index requirements, and the ultra-light weight of the truss structure is realized.
Further, as shown in fig. 2 and 3, the four-way joint 3-1 of the present embodiment includes a body, a first joint 3-1-1 and a second joint 3-1-2 disposed at two ends of the body and on the same plane, and a third joint 3-1-3 and a fourth joint 3-1-4 symmetrically disposed at two sides of the lower portion of the body. In the four-way joint 3-1 of the structure, a first joint 3-1-1 and a second joint 3-1-2 on the same plane are respectively used for inserting and connecting a fixed outer chord 1, a first inner chord 2-1 and a second inner chord 2-2 which are positioned on the same plane, and the third joint 3-1-3 and the fourth joint 3-1-4 which are symmetrically arranged on two sides of the lower part of a body are used for connecting 3 web members in a triangular section web member component 3 in pairs; through the four-way joint 3-1, the outer chord member 1, the first inner chord member 2-1 and the second inner chord member 2-2 are connected in the same direction through the triangular section web member assembly 3, and the 3 web members of the triangular section web member assembly 3 are also effectively connected, so that the connection points are all positioned on the four-way joint 3-1, the number of the connection points in the truss is reduced, the structural stability of the truss is improved, and the ultra-light truss structure is favorably realized.
Further, as shown in fig. 4, the outer side surfaces of the first joint 3-1-1 and the second joint 3-1-2 are provided with support lugs 3-1-5, and the support lugs 3-1-5 are provided with 3-1-6 connecting holes. The connecting points are provided for the first outer oblique web member 4-1, the second outer oblique web member 4-2 and the inner oblique web member 4-3 which are arranged between the adjacent triangular section web member assemblies 3 by arranging the support lugs 3-1-5 on the outer side surfaces of the first joint 3-1-1 and the second joint 3-1-2, the 3-1-6 connecting holes arranged on the support lugs 3-1-5 are beneficial to the fixing component 5 to fixedly connect the first outer diagonal web member 4-1, the second outer diagonal web member 4-2 and the inner diagonal web member 4-3 on the four-way joint 3-1, therefore, the fixed connection points are gathered on the four-way joint 3-1, the number of the connection points in the truss is further reduced, the connection tightness of the truss joint is improved, and the structural stability of the truss is improved.
Further, as shown in fig. 5 and 6, in this embodiment, the first outer diagonal web member 4-1, the second outer diagonal web member 4-2 and the inner diagonal web member 4-3 have the same structure, and both include a rod body 6, the two ends of the rod body 6 are provided with inner insertion joints 7, the inner insertion joints 7 are symmetrically provided with matching holes 7-1, and the inner insertion joints 7 between the matching holes 7-1 are further provided with symmetrical slots 7-2. The two ends of the rod body 6 are respectively provided with the inner inserting joints 7, and the inner inserting joints 7 are provided with the symmetrical clamping grooves 7-2 for realizing the clamping fit of the support lugs 3-1-5, and the symmetrically arranged matching holes 7-1 are aligned with the connecting holes 3-1-6, so that the fixing components 5 such as bolts are favorably inserted into the matching holes 7-1 and the connecting holes 3-1-6 for fixed connection, and the connection stability of the first outer oblique web member 4-1, the second outer oblique web member 4-2 and the inner oblique web member 4-3 with the four-way joint 3-1 is improved; the inner inserting joint 7 is preferably an aluminum joint, the aluminum joint is higher in hardness and lighter in weight, local rigidity is effectively improved, and ultra-light weight of the truss structure is favorably realized.
Further, the outer surface of the body of the four-way joint 3-1 of the present embodiment is provided with a reinforcing wall 3-1-7. The reinforcing wall 3-1-7 is arranged on the outer surface of the body of the four-way joint 3-1, so that the structural strength of the four-way joint 3-1 is enhanced, the load bearing is facilitated, and the bearing performance of the truss is improved.
Further, 3 web members of the triangular section web member assembly 3 of the present embodiment are each composed of an inner insertion tube 3-2 and a reinforcing sleeve 3-3 fitted around the outer surface of the inner insertion tube 3-2, and both ends of the inner insertion tube 3-2 are connected to a four-way joint 3-1, respectively. The reinforcing sleeve 3-3 is arranged on the outer surface of the inner insertion pipe 3-2, so that the load performance of the stressed member web member is enhanced, and the bearing performance of the truss is improved.
Further, the web member assembly 3 with triangular cross section of the present embodiment is of an overall equilateral triangle structure. The arranged web member assembly 3 with the triangular cross section has better overall structural stability, high assembly size precision and easy realization; furthermore, the side length of the whole equilateral triangle structure is 500 mm.
Further, the outer chord 1, the first inner chord 2-1 and the second inner chord 2-2 are all high-strength carbon fiber reinforced epoxy resin matrix composite circular arc tubes. Further, the cross-sectional dimensions of the circular arc tube of the outer chord 1 are as follows: the outer diameter phi is 30mm multiplied by the wall thickness delta 1.5mm, the diameter of the circular arc is 45m, and the cross-sectional sizes of the circular arc pipes of the outer chord, namely the first inner chord 2-1 and the second inner chord 2-2 are as follows: the diameter of the outer diameter phi is 30mm, the wall thickness delta is 1.5mm, and the diameter of the circular arc is 45.87 m. According to the comprehensive consideration of the mold processing cost and efficiency, the included angle of the arc centers of the triangular section arc-shaped composite material truss is generally designed to be 15 degrees, the assembly of the truss is facilitated, 24 sections of the truss can be assembled to form a circumferential truss, and the circumferential truss is applied to aerostats such as near space airships, high-altitude balloons and the like so as to meet the appearance structure of the aerostat. In order to ensure the integral rigidity and strength of the assembled truss structure and ensure the strength of the joint after the outer chord 1, the first inner chord 2-1 and the second inner chord 2-2 are connected, the wall thickness of an arc tube between the arc tube adopted by the outer chord 1, the first inner chord 2-1 and the second inner chord 2-2 and the distance between the arc tube and the two end parts is 120-150 mm is designed to be 2.0mm, the wall thickness from 1.5mm to 2.0mm is smoothly transited along the end parts, and the transition size is 50 mm.
Example 2
The preparation method of the arc tubes, namely the outer chord 1, the first inner chord 2-1 and the second inner chord 2-2, in the triangular section arc composite truss of the embodiment comprises the following steps: the surface of the Baolilong foam inner die is coated with a nylon air bag to form a soft inner die, then epoxy resin high-strength carbon fiber prepreg is flatly laid on the surface of the soft inner die according to a designed layer laying structure to form a prefabricated body, then the prefabricated body is placed in a lower die cavity of an outer die, an upper die is closed and fastened, after pressurizing to 0.8-1.1 MPa, heating, heat preservation, pressure maintaining, curing and forming are carried out, and after cooling, demoulding is carried out.
As shown in fig. 7, the specific preparation process of the arc tubes, i.e., the outer chord 1, the first inner chord 2-1 and the second inner chord 2-2, in the triangular section arc composite truss of the embodiment is as follows: firstly, a basic mould is received, then surface treatment of a nylon air bag is carried out on a basic mould polystyrene foam inner mould to form a soft inner mould, a release agent is coated on the soft inner mould, then epoxy resin high-strength carbon fiber prepreg is blanked and laid on the surface of the soft inner mould to form a prefabricated body, the prefabricated body is subjected to external heating and internal pressurization forming after being filled into the mould, after cooling and demoulding, preliminary treatment, truncation, apparent repair, polishing and paint spraying are carried out in sequence to obtain an arc tube, and the arc tube is inspected and delivered for use.
Further, the epoxy resin high-strength carbon fiber prepreg adopted in the embodiment is FAW150 epoxy resin high-strength carbon fiber prepreg with an area density of 150g/m 2.
Furthermore, the web members in the web member assembly 3 with a triangular cross section in this embodiment are all carbon fiber composite circular tubes with an outer diameter phi 22mm x a wall thickness delta 1.5mm, and the length is 340 mm.
Further, the four-way joint 3-1 is prepared by adopting a composite material prepreg laying method, the wall thickness of the whole body is 4mm, the reinforcing wall 3-1-7 on the outer surface of the body of the four-way joint 3-1 is prepared by adopting a compression molding method, and the thickness of the reinforcing wall 3-1-7 is 2 mm. The preparation method ensures the dimensional accuracy of the arc end face of the four-way joint 3-1 which is a key component of the truss structure, and simultaneously, the formed product has high compactness, reliable performance and high manufacturing efficiency. Furthermore, the chamfer of the support lug 3-1-5 in the four-way joint 3-1 is R15, and the connecting hole 3-1-6 is a through hole with the aperture phi of 8.5 mm.
Furthermore, in the four-way joint 3-1 of the present embodiment, the connecting hole 3-1-6 is fixed to the matching hole 7-1 of the first outer diagonal web member 4-1, the second outer diagonal web member 4-2, and the inner diagonal web member 4-3 by high strength bolt hinge connection.
Further, the inner insertion tubes 3-2 of the 3 web members of the triangular section web member assembly 3 of the present embodiment are all carbon fiber composite circular tubes with a diameter phi 19mm, a thickness delta 2.0mm and a length 60mm, and the surface roughness treatment is greater than Ra6.3, so as to ensure the bonding strength of the inner insertion tube 3-2 and the four-way joint 3-1.
Further, the assembly process of the web member assembly 3 with triangular section in this embodiment is as follows: coating adhesive glue on the outer surface of the inner inserting tube 3-2, sleeving the reinforcing sleeve 3-3, inserting the two ends of the reinforcing sleeve into a third joint or a fourth joint of the four-way joint 3-1 respectively, sequentially sleeving the 3 inner inserting tubes 3-2 on the reinforcing sleeve 3-3 and inserting the four-way joint 3-1 according to the method to obtain a prefabricated member, and then placing the prefabricated member into an assembly tool for accurate positioning to ensure the dimensional accuracy of the triangular section web member assembly 3, so that the dimensional accuracy of the truss is ensured; and after the bonding glue is solidified, disassembling and assembling the tool to obtain the web member assembly 3 with the triangular section.
Further, in this embodiment, the first outer diagonal web member 4-1, the second outer diagonal web member 4-2, and the inner diagonal web member 4-3 are all carbon fiber composite round tubes with an outer diameter of phi 22mm × a thickness of delta 1.5mm, and the first outer diagonal web member 4-1 and the second outer diagonal web member 4-2 are 1227mm in length, and the inner diagonal web member 4-3 is 1238mm in length. The inner insertion joints 7 at both ends of the first outer diagonal web member 4-1, the second outer diagonal web member 4-2 and the inner diagonal web member 4-3 are inner insertion aluminum joints, preferably LY9 series hard aluminum pipes, and have the specifications of an outer diameter phi 19mm x a thickness delta 3mm and a length of 40 mm.
Further, in this embodiment, the first external diagonal web member 4-1, the second external diagonal web member 4-2, and the internal diagonal web member 4-3 are all prepared by the following steps: polishing the outer surface of the raw material of the inner inserting joint until the surface roughness is larger than Ra6.3, polishing the surfaces of the inner sides of the two ends of the rod body 6 within about 40mm until the surface roughness is larger than Ra6.3, cleaning, then coating epoxy adhesive on the head of the raw material of the inner inserting joint after cleaning, inserting the inner sides of the two ends of the rod body 6 and aligning, after bonding and curing, symmetrically processing the two ends of the raw material of the inner inserting joint at the two ends of the rod body 6 respectively to form clamping grooves 7-2, and forming matching holes 7-1 between the symmetrically arranged clamping grooves 7-2 to form the inner inserting joint 7. And further, processing a strip-shaped clamping groove 7-2 with the width of 4.5mm and the depth of 30mm, rounding the end part of the clamping groove 7-2 to be R9.5, then forming a matching hole 7-1 with the diameter phi of 8.5mm between the symmetrically arranged clamping grooves 7-2, and connecting the hinged matching hole 7-1 with a connecting hole 3-1-6 in the four-way joint 3-1 by adopting a bolt to form fastening connection. The influence of the strength of the hinge hole on the rod body 6 is reduced by arranging the inner inserting connector 7, the rigidity of the joint is improved, the tensile deformation is avoided, meanwhile, the tensile load hinged by bolt connection is converted into the cementing shearing force on the inner side of the rod body, the tensile load is increased, and finally, the contact surface between the clamping groove 7-2 and the support lug 3-1-5 in the four-way connector 3-1 is cemented through the connecting action of the connecting component 5, so that the connecting strength is further increased.
And further, the adhesive is a normal-temperature curing epoxy resin adhesive.
Furthermore, the connecting assembly 5 is connected by high-strength bolts and nuts, the strength grade of the high-strength connecting bolts is 12.9 grade, the specification is M8 multiplied by 35mm (net length of the bolts), and the nuts are anti-loosening self-locking stainless steel nuts with the strength grade of A2-40.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (8)
1. The triangular-section arc-shaped composite truss is characterized by comprising outer chords (1), first inner chords (2-1) and second inner chords (2-2) which are parallel to each other, wherein the outer chords (1), the first inner chords (2-1) and the second inner chords (2-2) are connected in the same direction through uniformly-arranged triangular-section web member assemblies (3) to form an arc-shaped three-dimensional structure, each triangular-section web member assembly (3) is formed by connecting 3 web members in pairs through 3 four-way joints (3-1), first outer diagonal web members (4-1) are arranged on the outer chords (1) and the first inner chords (2-1) between the adjacent triangular-section web member assemblies (3) in a diagonal mode, the adjacent first outer diagonal web members (4-1) are arranged in a staggered mode, and the outer chords (1) and the second inner chords (2-2) between the adjacent triangular-section web member assemblies (3) in a diagonal mode are arranged in a diagonal mode The connecting device is provided with second outer diagonal web members (4-2), the arrangement directions of the adjacent second outer diagonal web members (4-2) are opposite, inner diagonal web members (4-3) are arranged diagonally on a first inner chord member (2-1) and a second inner chord member (2-2) between the adjacent triangular section web member assemblies (3), the adjacent inner diagonal web members (4-3) are arranged in a staggered manner, the first outer diagonal web member (4-1), the second outer diagonal web member (4-2) and the inner diagonal web member (4-3) in a unit structure formed by the adjacent triangular section web member assemblies (3) are arranged in a staggered manner of two pairs, and the first outer diagonal web member (4-1), the second outer diagonal web member (4-2) and the inner diagonal web member (4-3) are fixedly connected with a four-way joint (3-1) through fixing assemblies (5), the outer chord member (1), the first inner chord member (2-1), the second inner chord member (2-2), the triangular section web member assembly (3), the first outer oblique web member (4-1) and the second outer oblique web member (4-2) are all made of carbon fiber composite materials.
2. The triangular-section arc-shaped composite truss according to claim 1, wherein the four-way joint (3-1) comprises a body, a first joint (3-1-1) and a second joint (3-1-2) which are arranged at two ends of the body and are in the same plane, and a third joint (3-1-3) and a fourth joint (3-1-4) which are symmetrically arranged at two sides of the lower part of the body.
3. The arc-shaped composite material truss with the triangular cross section as claimed in claim 2, wherein the outer side surfaces of the first joint (3-1-1) and the second joint (3-1-2) are respectively provided with a support lug (3-1-5), and the support lugs (3-1-5) are provided with connecting holes (3-1-6).
4. The arc-shaped composite material truss with the triangular cross section as claimed in claim 1, wherein the first outer diagonal web member (4-1), the second outer diagonal web member (4-2) and the inner diagonal web member (4-3) have the same structure and comprise rod bodies (6), the two ends of each rod body (6) are provided with inner insertion joints (7), the inner insertion joints (7) are symmetrically provided with matching holes (7-1), and the inner insertion joints (7) between the matching holes (7-1) are further provided with symmetrical clamping grooves (7-2).
5. The triangular-section arc-shaped composite truss according to claim 1, wherein the four-way joint (3-1) is provided with a reinforcing wall (3-1-7) on the outer surface of the body.
6. The triangular-section arc-shaped composite truss as claimed in claim 1, wherein 3 web members of the triangular-section web member assembly (3) are each composed of an inner insert tube (3-2) and a reinforcing sleeve (3-3) fitted around the outer surface of the inner insert tube (3-2), and both ends of the inner insert tube (3-2) are connected to four-way joints (3-1), respectively.
7. The curved composite truss of triangular cross-section according to claim 1, wherein the web members (3) of triangular cross-section are of an overall equilateral triangle configuration.
8. The method for preparing the triangular section arc-shaped composite truss according to any one of claims 1-7, wherein the method for preparing the outer chord 1, the first inner chord 2-1 and the second inner chord 2-2 in the triangular section arc-shaped composite truss comprises the following steps: the method comprises the steps of coating a nylon air bag on the surface of a Styrofoam inner die to form a soft inner die, flatly laying epoxy resin high-strength carbon fiber prepreg on the surface of the soft inner die according to a designed laying structure to form a prefabricated body, then placing the prefabricated body in a lower die cavity of an outer die, closing and fastening an upper die, pressurizing to 0.8-1.1 MPa, heating, preserving heat, maintaining pressure, curing and forming, and cooling and demolding.
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| CN109356292A (en) * | 2018-11-29 | 2019-02-19 | 中冶京诚工程技术有限公司 | Prefabricated PC long-span beams structure |
| CN110671399A (en) * | 2019-09-12 | 2020-01-10 | 上海交通大学 | Modular connecting node for large triangular composite material pipe truss |
| CN110775303A (en) * | 2019-09-26 | 2020-02-11 | 上海宇航系统工程研究所 | High-bearing single-drive linked storage box of unfolding mechanism |
| CN111155646A (en) * | 2020-01-16 | 2020-05-15 | 上海交通大学 | Node for large triangular-section composite circular tube truss |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7891608B2 (en) * | 2007-05-03 | 2011-02-22 | The Boeing Company | Space frame fuselage structure and related methods |
| US8782992B2 (en) * | 2011-04-11 | 2014-07-22 | Juan Lin | Aluminium alloy truss structure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356292A (en) * | 2018-11-29 | 2019-02-19 | 中冶京诚工程技术有限公司 | Prefabricated PC long-span beams structure |
| CN110671399A (en) * | 2019-09-12 | 2020-01-10 | 上海交通大学 | Modular connecting node for large triangular composite material pipe truss |
| CN110775303A (en) * | 2019-09-26 | 2020-02-11 | 上海宇航系统工程研究所 | High-bearing single-drive linked storage box of unfolding mechanism |
| CN111155646A (en) * | 2020-01-16 | 2020-05-15 | 上海交通大学 | Node for large triangular-section composite circular tube truss |
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