CN111438968A - Three-dimensional multidirectional woven carbon fiber bearing structure and manufacturing method thereof - Google Patents
Three-dimensional multidirectional woven carbon fiber bearing structure and manufacturing method thereof Download PDFInfo
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- CN111438968A CN111438968A CN202010176428.7A CN202010176428A CN111438968A CN 111438968 A CN111438968 A CN 111438968A CN 202010176428 A CN202010176428 A CN 202010176428A CN 111438968 A CN111438968 A CN 111438968A
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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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
- B29C70/682—Preformed parts characterised by their structure, e.g. form
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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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/70—Completely encapsulating inserts
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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
Abstract
The invention relates to the technical field of near space aerostat force bearing structure equipment, and discloses a three-dimensional multidirectional weaving carbon fiber bearing structure and a manufacturing method thereof, wherein the three-dimensional multidirectional weaving carbon fiber bearing structure comprises a three-dimensional multidirectional weaving pipe body and licker-in joints arranged at two ends of the three-dimensional multidirectional weaving pipe body, the three-dimensional multidirectional weaving pipe body is formed by weaving and curing a carbon fiber composite material, a plurality of sharp needles are arranged on the outer surface of the licker-in joint, and the sharp needles are embedded in the inner wall of the three-dimensional multidirectional weaving pipe body. The three-dimensional multidirectional woven carbon fiber bearing structure has excellent mechanical property, the structure reduces weight, simultaneously, the rigidity and the axial bearing strength of the bearing structure are greatly improved, the bearing strength is more than 6 times of the traditional connection strength, the defect of layered damage in the traditional connection technology is overcome, and the application requirement of the heavy-load connection structure of the near space aerostat can be met.
Description
Technical Field
The invention relates to the technical field of near space aerostat force bearing structures, in particular to a three-dimensional multidirectional woven carbon fiber bearing structure and a manufacturing method thereof.
Background
The near space aerostat is a type of aircraft which works in the near space and performs certain tasks by utilizing unique resources and characteristics of the near space, and can comprise near space airships, helium-filled high-altitude free floating balloons, stratosphere high-altitude long-endurance unmanned aerial vehicles, remote control gliding aircraft and other forms. The carbon fiber composite material has excellent mechanical properties, and particularly has great advantages in the aspects of specific strength, specific rigidity and the like, so that the carbon fiber composite material circular tube is considered as a main bearing structure of the near space aerostat and is a necessary trend, on one hand, the lightweight can be realized, and on the other hand, the bearing capacity overloading requirement can be realized.
The composite material structural members are mainly connected by gluing, mechanical connection, riveting, mixing and the like. For the glue joint, the interface performance of the adhesive and the bonding interface of the composite material circular tube can be weakened under the action of complex external force, so that the bonding interface becomes a weak link. For mechanical connections, it is generally considered to connect two structural parts together by means of perforations, the structures often exhibiting, under load, relatively large stress concentrations and distortions at the connection site. The connection modes of the two-dimensional composite materials are mainly considered, and the two-dimensional composite materials with obvious interlayer performance serving as a main bearing structure hardly meet the heavy-load requirement. Generally, 2D composites have the outstanding problems of poor out-of-plane properties, severe delamination under thermal/force cycling, fragile microscopic interfaces in the presence of harsh low temperature environment in the vicinity of space (below-70 ℃), and the like.
Disclosure of Invention
The embodiment of the invention provides a three-dimensional multidirectional woven carbon fiber bearing structure and a manufacturing method thereof, which are used for solving the problems of layering damage, difficulty in bearing heavy load and difficulty in being applied to an adjacent space in the existing connecting technology.
The embodiment of the invention provides a three-dimensional multidirectional weaving carbon fiber bearing structure which comprises a three-dimensional multidirectional weaving pipe body and licker-in joints arranged at two ends of the three-dimensional multidirectional weaving pipe body, wherein the three-dimensional multidirectional weaving pipe body is formed by weaving and solidifying a carbon fiber composite material, a plurality of sharp needles are arranged on the outer surface of each licker-in joint, and the sharp needles are embedded in the inner wall of the three-dimensional multidirectional weaving pipe body.
The licker-in joint is provided with a plurality of rows of sharp needle groups at intervals in the axial direction, two adjacent rows of sharp needle groups are arranged in a staggered mode, and each row of sharp needle group comprises a plurality of sharp needles uniformly arranged along the circumferential direction of the licker-in joint.
Wherein, the sharp needle comprises a cylindrical root part and a conical tip part which are connected with each other; the root of the cylinder is embedded into the licker-in joint, and the embedded depth is not less than 5 mm; the conical tip portion is embedded in the inner wall of the three-dimensional multidirectional weaving tube body.
Wherein, the volume content of the carbon fiber in the three-dimensional multidirectional weaving tube body is between 45 and 60 percent.
The three-dimensional multidirectional weaving pipe body is characterized in that the weaving structure of the three-dimensional multidirectional weaving pipe body is a three-dimensional five-way weaving mode or a three-dimensional four-way weaving mode.
Wherein the knitting angle of the three-dimensional multidirectional knitting pipe body is 10-35 degrees.
Wherein, licker-in connects for being equipped with the titanium alloy licker-in joint in internal thread hole.
And a foam mandrel is inserted into the three-dimensional multidirectional weaving pipe body and is positioned between the two licker-in joints.
Wherein, the inside of foam dabber is seted up blind hole or through-hole in the axial.
The embodiment of the present invention further provides a manufacturing method for manufacturing the three-dimensional multidirectional woven carbon fiber bearing structure, including:
the two ends of the foam mandrel are sleeved with licker-in joints;
weaving a carbon fiber composite material on the outer surfaces of the foam mandrel and the licker-in joint by adopting a three-dimensional multidirectional weaving method to obtain a three-dimensional multidirectional weaving pipe body;
carrying out resin transfer molding on the knitted three-dimensional multidirectional knitted tube body to integrally cure and form;
and carrying out hollow treatment on the foam mandrel in the solidified three-dimensional multidirectional woven pipe body.
The embodiment of the invention provides a three-dimensional multidirectional woven carbon fiber bearing structure and a manufacturing method thereof, wherein the three-dimensional multidirectional woven carbon fiber bearing structure comprises a three-dimensional multidirectional woven pipe body and licker-in joints arranged at two ends of the three-dimensional multidirectional woven pipe body, the three-dimensional multidirectional woven pipe body is formed by weaving and solidifying a carbon fiber composite material, and the three-dimensional multidirectional woven pipe body is manufactured in a three-dimensional multidirectional weaving mode, so that the axial bearing capacity is obviously enhanced; the outer surface of the licker-in joint is provided with a plurality of sharp needles embedded in the inner wall of the three-dimensional multidirectional weaving pipe body, in-plane shearing failure in the traditional connecting method is converted into shearing and bending combined failure, the fatigue failure resistance is improved, the influence of an interface on failure behaviors is reduced to the maximum extent, the stress concentration phenomenon which easily occurs in the traditional connection is effectively avoided, and the bearing capacity is greatly enhanced. The three-dimensional multidirectional woven carbon fiber bearing structure has excellent mechanical property, the structure reduces weight, simultaneously, the rigidity and the axial bearing strength of the bearing structure are greatly improved, the bearing strength is more than 6 times of the traditional connection strength, the defect of layered damage in the traditional connection technology is overcome, and the application requirement of the heavy-load connection structure of the near space aerostat can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a three-dimensional multi-directional woven carbon fiber load-bearing structure in an embodiment of the present invention;
FIG. 2 is a schematic view of a configuration of a lickerin joint in an embodiment of the invention;
FIG. 3 is a cross-sectional view of the lickerin joint of FIG. 2;
FIG. 4 is a top view of the lickerin joint of FIG. 2;
FIG. 5 is a schematic structural view of another three-dimensional multi-directional woven carbon fiber load-bearing structure in an embodiment of the present invention;
FIG. 6 is a schematic structural view of yet another three-dimensional multi-directional woven carbon fiber load-bearing structure in an embodiment of the present invention;
FIG. 7 is a schematic structural view of a three-dimensional multi-directional woven carbon fiber load-bearing structure during the fabrication of the structure in an embodiment of the present invention;
FIG. 8 is a schematic structural view of a foam mandrel used in the fabrication of a three-dimensional multi-direction woven carbon fiber load bearing structure in accordance with an embodiment of the present invention;
description of reference numerals:
1. weaving a pipe body in three dimensions and multiple directions; 2. A licker-in joint; 21. An internally threaded bore;
3. a sharp needle; 31. A cylindrical root; 32. A tapered tip portion;
4. a foam mandrel; 41. And a through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "upper", "lower", "left", "right", and the like are used only to indicate a relative positional relationship, and when the absolute position of a described object is changed, the relative positional relationship may also be changed accordingly. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
It is to be understood that, unless otherwise expressly specified or limited, the term "coupled" is used broadly, and may, for example, refer to directly coupled devices or indirectly coupled devices through intervening media. Specific meanings of the above terms in the embodiments of the invention will be understood to those of ordinary skill in the art in specific cases.
As shown in fig. 1, the three-dimensional multi-directional knitted carbon fiber bearing structure provided by the embodiment of the invention comprises a three-dimensional multi-directional knitted tube body 1 and spike roller joints 2 arranged at two ends of the three-dimensional multi-directional knitted tube body 1, wherein the three-dimensional multi-directional knitted tube body 1 is formed by knitting and solidifying a carbon fiber composite material, a plurality of sharp needles 3 are arranged on the outer surface of the spike roller joints 2, and the sharp needles 3 are embedded in the inner wall of the three-dimensional multi-directional knitted tube body 1.
Specifically, the three-dimensional multidirectional knitted tube body 1 is formed by knitting and solidifying a carbon fiber composite material, the carbon fiber composite material is formed by converting organic fibers through a series of heat treatment, inorganic high-performance fibers with carbon content higher than 90% have inherent characteristics of carbon materials and soft processability of textile fibers, and the carbon fibers can be compounded with a resin matrix to form a structural material. Meanwhile, the carbon fiber composite material is woven in a three-dimensional multidirectional (3DnD) weaving mode, so that the defects that the two-dimensional (2D) composite material is poor in out-of-plane performance, serious in layering under heat/force circulation, fragile in microscopic interface under the condition of a near space severe low-temperature environment (below 70 ℃) and the like are overcome. Compared with a two-dimensional composite material, the three-dimensional woven composite material has a completely integral and non-layered structure, has high specific strength and specific modulus, has excellent mechanical property and functional property, and can be used for manufacturing structural parts and high-functional parts. On the basis of a three-dimensional four-way woven structure, reinforcing fibers can be considered in the x direction, the y direction or the z direction according to needs, so that three-dimensional five-way, three-dimensional six-way, three-dimensional seven-way and other structures can be formed, the fibers are interwoven and crossed together in a plane and are also interwoven and crossed together in a three-dimensional space through the thickness direction, a non-layered integral structure is formed, the axial, annular and radial mechanical properties of the material are improved to different degrees, and the integrity of the bearing deformation of the composite material structure is maintained.
The licker-in joint 2 is a tubular joint, and the outer surface of the licker-in joint 2 is connected with the inner surface of the three-dimensional multi-directional woven pipe body 1 in a matching way. In a specific embodiment, the length of the lickerin roll joint 2 is 0.1 to 0.15 times the length of the three-dimensional multi-directional woven tube body 1. The outer surface of the licker-in connector 2 is provided with a plurality of sharp needles 3, the sharp needles 3 are embedded into the three-dimensional multi-directional knitted tube body 1 along the thickness direction of the three-dimensional multi-directional knitted tube body 1, and the outer diameter of a circle where the sharp points of the sharp needles 3 are located is smaller than the designed outer diameter of the three-dimensional multi-directional knitted tube body 1, and in a specific embodiment, the difference is about 1.4 mm.
The three-dimensional multidirectional woven carbon fiber bearing structure comprises a three-dimensional multidirectional woven pipe body 1 and licker-in joints 2 arranged at two ends of the three-dimensional multidirectional woven pipe body 1, wherein the three-dimensional multidirectional woven pipe body 1 is formed by weaving and solidifying carbon fiber composite materials, and the axial bearing capacity is obviously enhanced by adopting a three-dimensional multidirectional weaving mode; the outer surface of the licker-in joint 2 is provided with a plurality of sharp needles 3 embedded in the inner wall of the three-dimensional multidirectional weaving pipe body 1, in-plane shearing failure in the traditional connecting method is converted into shearing and bending combined failure, the anti-fatigue failure capability is improved, the influence of an interface on failure behavior is reduced to the maximum extent, the stress concentration phenomenon which easily occurs in the traditional connection is effectively avoided, and the bearing capability is greatly enhanced. The three-dimensional multidirectional woven carbon fiber bearing structure has excellent mechanical property, the structure reduces weight, simultaneously, the rigidity and the axial bearing strength of the bearing structure are greatly improved, the bearing strength is more than 6 times of the traditional connection strength, the defect of layered damage in the traditional connection technology is overcome, and the application requirement of the heavy-load connection structure of the near space aerostat can be met.
Further, as shown in fig. 2 to 4, the licker-in junction 2 is provided with a plurality of rows of sharp needle sets at intervals in the axial direction, the two adjacent rows of sharp needle sets are arranged in a staggered manner, and each row of sharp needle sets comprises a plurality of sharp needles 3 uniformly arranged along the circumferential direction of the licker-in junction 2. In a specific embodiment, 16 sharp needles 3 are uniformly distributed on the outer surface of the licker-in joint 2 along the circumferential direction, the included angle between two adjacent sharp needles 3 is 22.5 degrees, 10 rows of sharp needle groups are uniformly distributed along the height direction of the licker-in joint 2, the height interval between two adjacent rows of sharp needle groups is 5mm, and the angles of the two adjacent rows of sharp needle groups are staggered by 11.25 degrees.
Further, as shown in fig. 3, the sharp needle 3 includes a cylindrical root portion 31 and a tapered tip portion 32 which meet. The cylindrical root 31 is embedded in the lickerin connection 2 to a depth of not less than 5 mm. The tapered tip portion 32 is embedded in the inner wall of the three-dimensional multi-directional braided tube body 1. Specifically, the outer surface of the licker-in joint 2 is provided with a pinhole corresponding to the mounting position of the sharp needle 3, the aperture of the pinhole is slightly larger than the outer diameter of the cylindrical root 31, and the cylindrical root 31 is fixedly connected with the licker-in joint 2 in a rigid pressing-in mode. The solid wall thickness of the licker-in joint 2 is greater than the depth of the needle hole, and the connecting part of the cylindrical root 31 and the conical tip 32 adopts smooth transition.
In a specific embodiment, the outer diameter of the cylindrical root 31 may be 2mm and the total length of the spike 3 is 7.8 mm. The depth of the needle hole can be between 5mm and 5.5mm, and the depth of the cylindrical root 31 penetrating into the needle hole is correspondingly between 5mm and 5.5mm (tolerance +/-0.2 mm). The solid wall thickness of the lickerin roll joint 2 is at least 2mm greater than the depth of the needle hole. The size of the conical tip 32 exposed to the outer surface of the lickerin connection 2 is between 2.8mm and 3.5 mm.
Further, the volume content of the carbon fiber in the three-dimensional multi-directional braided tube body 1 is 45-60%. In a specific embodiment, the volume content of the carbon fiber in the three-dimensional multi-directional braided tube body 1 can be between 50% and 55%, and the porosity is controlled below 6%.
Further, the knitting configuration of the three-dimensional multi-directional knitting tube body 1 is a three-dimensional five-directional knitting pattern or a three-dimensional four-directional knitting pattern. The knitting angle of the three-dimensional multi-directional knitting pipe body 1 is 10 degrees to 35 degrees.
Specifically, if the requirement on the axial bearing performance of the woven structure is high, the weaving angle of the three-dimensional multi-directional woven pipe body 1 can be controlled within the range of 10-15 degrees, the axial fiber content is increased as much as possible, and a three-dimensional five-directional weaving mode (3D5D) is selected as a weaving configuration; if the requirement on the torsion resistance of the woven structure is high, the weaving angle is controlled within the range of 20-35 degrees, and a three-dimensional four-way weaving mode (3D4D) is selected as the weaving configuration.
Further, the licker-in joint 2 may be a titanium alloy licker-in joint provided with an internally threaded hole 21. The detachable connection with other external members can be realized by providing the internal thread hole 21.
Further, as shown in fig. 5, a foam mandrel 4 is inserted into the three-dimensional multi-directional woven tube 1, and the foam mandrel 4 is located between the two licker-in joints 2. Specifically, the foam core shaft 4 may be made of a rigid foam material, such as Polymethacrylimide (PMI) foam, rigid polyurethane foam, rigid polyvinyl chloride foam, or the like. This embodiment will be described by taking PMI foam as an example of the foam mandrel 4. The outer diameter of the foam mandrel 4 is slightly larger than the outer diameter of the lickerin connection 2 without the spike 3. In a specific embodiment, the difference between the outer diameter of the foam mandrel 4 and the outer diameter of the lickerin connection 2 without the spike 3 is 1/3-1/5 of the thickness of the tube wall.
Furthermore, as shown in fig. 6, the foam core shaft 4 is provided with a blind hole or a through hole 41 in the axial direction, so that the weight of the whole structure can be reduced while the bearing capacity is ensured, and the lightweight design is realized.
As shown in fig. 7 and 8, an embodiment of the present invention further provides a manufacturing method for manufacturing the three-dimensional multi-directional woven carbon fiber bearing structure, which includes:
step S1: the licker-in joints 2 are sleeved at the two ends of the foam mandrel 4. Specifically, as shown in fig. 8, the foam core shaft 4 at the beginning may be a stepped shaft with a thick middle part and thin two ends, that is, the diameter of the middle part of the foam core shaft 4 is larger than the diameters of the two ends, and the licker-in joints 2 are sleeved at the two ends of the foam core shaft 4.
Step S2: and weaving the carbon fiber composite material on the outer surfaces of the foam mandrel 4 and the licker-in joint 2 by adopting a three-dimensional multidirectional weaving method to obtain the three-dimensional multidirectional woven pipe body 1. Specifically, a three-dimensional four-way or three-dimensional five-way weaving mode can be adopted as required, and the weaving angle can be adjusted simultaneously. The weaving thickness can be designed to be 0.5mm in each layer, the total thickness is woven according to the design size, and the outer diameter of the finally obtained three-dimensional multidirectional weaving tube body 1 is about 0.2mm smaller than that of an initially theoretically designed round tube in a radially compacted state. The outer diameter of the end part of the foam mandrel 4 and the outer diameter of the licker-in joint 2 jointly determine the wall thickness of the three-dimensional multi-directional braided tube body 1.
Step S3: and carrying out resin transfer molding and integral curing molding on the woven three-dimensional multidirectional woven pipe body 1 to obtain the standardized main bearing structural member. Among them, Resin Transfer Molding (RTM) is a process of injecting Resin into a closed mold to impregnate a reinforcing material and curing the reinforcing material.
Step S4: and (3) performing hollow treatment on the foam mandrel 4 in the solidified three-dimensional multidirectional braided tube body 1 to realize the maximum lightweight design. Specifically, the foam mandrel 4 may be partially hollow, and as shown in fig. 5, shaft segments at both ends of the foam mandrel 4 may be removed, so that the internal threaded hole of the lickerin junction 2 may be exposed. Alternatively, as shown in fig. 6, the foam core 4 may be axially extended through a through hole 41 to further reduce the mass. Or as shown in fig. 1, the foam mandrel 4 can be removed as a whole, so as to achieve the maximum light weight design, and the three-dimensional multi-directional braided tube body 1 is cured, so that the whole structure still has strong bearing capacity.
Furthermore, secondary finish machining can be carried out on the solidified three-dimensional multidirectional woven pipe body 1, and the heavy-load main bearing structural member applied to practical engineering is obtained.
Compared with the traditional composite material connecting method, the heavy-load connecting method (namely the manufacturing method of the three-dimensional multidirectional woven carbon fiber bearing structure) for the embedded licker-in joint of the three-dimensional multidirectional carbon fiber tubular structure provided by the invention has the following advantages:
1) the connecting method integrates the advantages of composite material glue joint, riveting joint and mixed joint, overcomes the defect of weaker performance between layers of the 2D composite material, and realizes the heavy loading of the structure;
2) the connection method realizes that the bearing performance can be designed, the weaving angle and the fiber volume content can be designed according to the use performance requirement, a three-dimensional five-way weaving configuration can be selected for a structural member with higher axial bearing performance requirement, a three-dimensional four-way weaving configuration can be selected for a structural member with higher torsion resistance, and the mechanical property is enhanced while the requirement of maximum light weight is realized;
3) the connecting method effectively converts the in-plane shear failure in the traditional connecting method into the combined shear and bending failure, improves the fatigue failure resistance, reduces the influence of the interface on the failure behavior to the maximum extent, effectively avoids the stress concentration phenomenon easily occurring in the traditional connection, and greatly enhances the bearing capacity.
According to the embodiment, the three-dimensional multidirectional woven carbon fiber bearing structure and the manufacturing method thereof provided by the invention are characterized in that the three-dimensional multidirectional woven carbon fiber bearing structure comprises a three-dimensional multidirectional woven pipe body 1 and licker-in joints 2 arranged at two ends of the three-dimensional multidirectional woven pipe body 1, the three-dimensional multidirectional woven pipe body 1 is formed by weaving and solidifying carbon fiber composite materials, and the axial bearing capacity is obviously enhanced by adopting a three-dimensional multidirectional weaving mode for manufacturing; the outer surface of the licker-in joint 2 is provided with a plurality of sharp needles 3 embedded in the inner wall of the three-dimensional multidirectional weaving pipe body 1, in-plane shearing failure in the traditional connecting method is converted into shearing and bending combined failure, the anti-fatigue failure capability is improved, the influence of an interface on failure behavior is reduced to the maximum extent, the stress concentration phenomenon which easily occurs in the traditional connection is effectively avoided, and the bearing capability is greatly enhanced. The three-dimensional multidirectional woven carbon fiber bearing structure has excellent mechanical property, the structure reduces weight, simultaneously, the rigidity and the axial bearing strength of the bearing structure are greatly improved, the bearing strength is more than 6 times of the traditional connection strength, the defect of layered damage in the traditional connection technology is overcome, and the application requirement of the heavy-load connection structure of the near space aerostat can be met. And the tensile, torsion and bending resistant designs can be carried out on the three-dimensional multidirectional woven pipe body according to different bearing and using requirements of the structural member. The structural design of the foam mandrel enables the curing to be more effective on one hand, and enables the structure to meet the requirement of maximum light weight on the other hand.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The three-dimensional multidirectional knitted carbon fiber bearing structure is characterized by comprising a three-dimensional multidirectional knitted pipe body and licker-in joints arranged at two ends of the three-dimensional multidirectional knitted pipe body, wherein the three-dimensional multidirectional knitted pipe body is formed by knitting and solidifying carbon fiber composite materials, a plurality of sharp needles are arranged on the outer surface of each licker-in joint, and the sharp needles are embedded in the inner wall of the three-dimensional multidirectional knitted pipe body.
2. The three-dimensional multidirectional weaving carbon fiber bearing structure according to claim 1, wherein the licker-in joint is provided with a plurality of rows of the pointed needle groups at intervals in the axial direction, two adjacent rows of the pointed needle groups are arranged in a staggered mode, and each row of the pointed needle groups comprises a plurality of the pointed needles uniformly arranged along the circumferential direction of the licker-in joint.
3. The three-dimensional multidirectional knitted carbon fiber load-bearing structure of claim 1, wherein said sharp needle comprises a cylindrical root and a tapered tip that meet; the root of the cylinder is embedded into the licker-in joint, and the embedded depth is not less than 5 mm; the conical tip portion is embedded in the inner wall of the three-dimensional multidirectional weaving tube body.
4. The three-dimensional multidirectional woven carbon fiber load-bearing structure of claim 1, wherein a volume content of carbon fibers in said three-dimensional multidirectional woven tube body is between 45% and 60%.
5. The three-dimensional multidirectional woven carbon fiber load-bearing structure of claim 4, wherein a weaving configuration of said three-dimensional multidirectional woven tube body is a three-dimensional five-way weaving pattern or a three-dimensional four-way weaving pattern.
6. The three-dimensional multidirectional knitted carbon fiber bearing structure according to claim 5, wherein a knitting angle of the three-dimensional multidirectional knitted tube body is 10 ° to 35 °.
7. The three-dimensional multidirectional woven carbon fiber load-bearing structure of claim 1, wherein said licker-in nipple is a titanium alloy licker-in nipple provided with an internally threaded hole.
8. The three dimensional multidirectional woven carbon fiber load bearing structure of claim 1, wherein a foam mandrel is inserted inside said three dimensional multidirectional woven tube body, said foam mandrel being located between two of said lickerin junctions.
9. The three-dimensional multidirectional woven carbon fiber bearing structure of claim 8, wherein the foam mandrel is provided with blind or through holes in the axial direction inside.
10. A method of manufacturing a three-dimensional multi-direction woven carbon fiber load-bearing structure according to any one of claims 1 to 9, comprising:
the two ends of the foam mandrel are sleeved with licker-in joints;
weaving a carbon fiber composite material on the outer surfaces of the foam mandrel and the licker-in joint by adopting a three-dimensional multidirectional weaving method to obtain a three-dimensional multidirectional weaving pipe body;
carrying out resin transfer molding on the knitted three-dimensional multidirectional knitted tube body to integrally cure and form;
and carrying out hollow treatment on the foam mandrel in the solidified three-dimensional multidirectional woven pipe body.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712049A (en) * | 2012-09-28 | 2014-04-09 | 张长增 | Fiber composite material bearing rod or pipe and forming method thereof |
| CN104339662A (en) * | 2013-07-29 | 2015-02-11 | 宝马股份公司 | Method for manufacturing fiber compsite setting unit and fiber composite setting unit |
| JP2015530525A (en) * | 2012-07-03 | 2015-10-15 | ファイバーライン・アクティーゼルスカブＦｉｂｅｒｌｉｎｅ Ａ／Ｓ | Method of manufacturing an assembly for use in a fiber reinforced structural element |
| CN208074027U (en) * | 2017-12-29 | 2018-11-09 | 刘念 | The connection structure of licker-in connector and three-dimensional braided structure body |
-
2020
- 2020-03-13 CN CN202010176428.7A patent/CN111438968A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015530525A (en) * | 2012-07-03 | 2015-10-15 | ファイバーライン・アクティーゼルスカブＦｉｂｅｒｌｉｎｅ Ａ／Ｓ | Method of manufacturing an assembly for use in a fiber reinforced structural element |
| CN103712049A (en) * | 2012-09-28 | 2014-04-09 | 张长增 | Fiber composite material bearing rod or pipe and forming method thereof |
| CN104339662A (en) * | 2013-07-29 | 2015-02-11 | 宝马股份公司 | Method for manufacturing fiber compsite setting unit and fiber composite setting unit |
| CN208074027U (en) * | 2017-12-29 | 2018-11-09 | 刘念 | The connection structure of licker-in connector and three-dimensional braided structure body |
Non-Patent Citations (2)
| Title |
|---|
| 俞建勇等: "《高性能纤维制品成形技术》", 31 July 2017 * |
| 罗红林: "《复合材料精品教程》", 31 May 2018 * |
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