CN110442982A - A kind of composite material unilateral pumping nail rivet arrangement and its design method - Google Patents
A kind of composite material unilateral pumping nail rivet arrangement and its design method Download PDFInfo
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- CN110442982A CN110442982A CN201910734712.9A CN201910734712A CN110442982A CN 110442982 A CN110442982 A CN 110442982A CN 201910734712 A CN201910734712 A CN 201910734712A CN 110442982 A CN110442982 A CN 110442982A
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- bushing
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- rivet nut
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Abstract
The present invention relates to structures and its design method that a kind of interference of composite material connects dedicated unilateral pumping nail rivet.Unilateral pumping nail rivet arrangement includes expansion bushing, threaded core bar, four nut, rivet nut components is driven to be formed.The advantage of the structure is: first, so that composite material connected piece is formed interference connection, improves the fatigue life of composite material connected piece；Second, this architecture provides certain pretightning forces, improve the bonding strength of composite material connected piece.The requirement of catenation principle and composite material interference connection according to this structure, establishes each component design method of unilateral pumping nail rivet.
Description
Technical field
The present invention relates to advanced manufacturing technology field, specifically a kind of unilateral pumping nail rivet and its construction design method.
Background technique
Composite material have specific strength is high, specific stiffness is high, designability is good, fatigue crack-resistant performance is good, it is corrosion-resistant and
Convenient for excellent characteristics such as large scale moldings, it is widely used in the fields such as aviation and large-scale ships, since composite material prepares component
It is difficult to realize connection by welding, therefore, is connected to become the core technology for restricting composite material widespread adoption, at present composite wood
The type of attachment of material mainly has splicing, is bolted, rivets.Splicing is widely used, but cannot be used for transmitting larger concentration
Load, while the interlaminar strength of material and adhesive intensity difference are very big, glue-line peel strength is very low, is bolted and rivet
Be connected to the big bearer connection joint form of composite structure, there are the following problems: (1) larger preload can be provided by being bolted
The connection of power, mostly gap, significantly attenuating fatigue life, while the weight of jointing occupies the 20%-30% of construction weight, into
And causing that composite structure reliability is low, loss of weight is unobvious, (2) riveting can not obtain consistent clamping force, and install thickness
Limited, certain special occasions are unable to get use, therefore, need that the connector compared with big load, high reliability can be transmitted, with this
The performance for improving composite material jointing, in consideration of it, it is proposed that a kind of unilateral pumping nail rivet arrangement of composite material.
Summary of the invention
Based on deficiency present in composite material connection performance and above-mentioned technology, provide one kind may be implemented to carry greatly,
The interference of high prefastening load connects the unilateral pumping nail rivet of composite material, and establishes list based on connected piece thickness and opening diameter
Each component design method of side pumping nail rivet.
In order to reach above-mentioned requirements, technical solution of the present invention are as follows:
The end of a kind of composite material unilateral pumping nail rivet arrangement, including core bar 1, the core bar 1 is equipped with T connector portion 6,
Screw thread is offered at the center of the core bar 1,1 side wall of core bar is divided into core bar light bar segment 5, core bar thread segment 7 and gripping section
8, the core bar 1 is arranged with rivet nut 3 outside, and 3 two sides of rivet nut are respectively equipped with bushing 2 and driving nut 4,2 peripheral hardware of bushing
There is composite sandwich plate 14.
The core bar 1 is threadedly coupled with the driving nut 4.
The internal diameter of the bushing 2 is less than the outer diameter of the rivet nut 3.
The rivet nut 3 is hollow cylindrical pore structure, and 3 both ends of rivet nut are respectively equipped with rivet nut boss face 10 and rivet nut circle
Arc 11, the rivet nut 3 are equipped with rivet nut chamfering 9 close to the position of the rivet nut circular arc 11.
2 both ends of bushing are respectively equipped with bushing boss face 12 and the end conical surface 13.
Through-hole is offered at the center of the composite sandwich plate.
A kind of construction design method connecting unilateral pumping nail rivet based on composite material, comprising the following steps:
Step 1: the Preliminary design of composite laminated plate jointing:
When designing fastener sizes structure, it is first determined aperture size is connected required for laminate, if required connection is laminated
Panel aperture is D0, it is usually to squeeze to destroy, therefore wanted according to composite Materials Design handbook that fastener, which connects acceptable failure mode,
It asks, laminate end diameter ratio e/D need to be met0>=3, width-diameter ratio w/D0>=4 design size, while to meet aperture and connection plate thickness
Degree ratio is 1≤(D0/t)≤2；
Assuming that required connection composite panel veneer plate thickness is t/2, then two plates connection overall thickness is t, composite panel
Aperture is D0；Jointing size is determined, then can design bushing relative dimensions；Fastener connect amount of interference usually withIt defines, therefore unilateral pumping nail rivet nail hole relative interference amountIt is wherein swollen
Swollen bushing inner diameter is d, and outer diameter D, rivet nut outer diameter is D2, while the part of expansion expansion sleeve, chamfering are played in rivet nut front end
For a；
Step 2: expansion bushing size design:
1) Outer Diameter of lining size design:
Composite material aperture is D0, convenient for bushing installation when embedded hole in, if expansion bushing outer diameter be D, bushing initially with
Interporal lacuna cooperation, fit tolerance are+0.1/0mm；
2) bushing wall thickness size design:
Interfere the research of mating connection damage mechanics according to composite material, evaluates, choose according to structural mechanics and the mechanics of materials
It is suitable for amount of interference I, if expansion bushing wall thickness is h1, obtaining expansion bushing internal diameter is d=D-2h1；
3) gasket end dog-ear size design:
Known connected plate overall thickness is t, and expansion bushing total length is L, takes expansion bushing left side boss with a thickness of S,
L1Equal to segment length among expansion bushing；In order to form the inside dog-ear in end, if length needed for expansion sleeve linkage section stretching plate thickness
Degree is f1, then f1=M-S-t, and dog-ear segment length is f2, then f2=L-M, angle a1；
Step 3: rivet nut size design:
1) rivet nut outer diameter designs；
Opening diameter D0, expansion bushing internal diameter d is I according to the connection relative interference amount selected, rivet nut outer diameter is calculated
D2；
2) rivet nut internal diameter designs:
Taking rivet nut wall thickness is h2, then rivet nut internal diameter D1=D2-2h2；Rivet nut front end changeover portion partial-length is L2, then L2=
L3-L4, angle a；
Step 4: nut and core bar size design:
1) threaded core bar size design:
Core bar and rivet nut clearance fit, core bar head diameter D=D0, secondly required according to suitable draw ratio, design meets
Coupling part size, total length are set as C；
2) nut size design is driven:
The driving nut to be matched according to the core bar thread size of above-mentioned design, selection with core bar threads；
Step 5: determination is optimized to the unilateral pumping nail rivet arrangement size of Preliminary design
1) establish threedimensional model using ABAQUS: fibre reinforced composites use solid modelling, and call three-dimensional
Hashin loss starting criterion simulates the damage and failure of composite material, and unilateral each components of pumping nail rivet are built using entity
Mould；
2) boundary condition of connection structure, due to being the fastener of Preliminary design, in simulation, it is dry for Main Analysis
It relates to and is installed effect and each components meet with stresses state；
3) grid dividing of connection structure, to reduce influence of the mesh quality to calculated result, device to hole week region and each
Components carry out mesh refinement, are roughened far from join domain grid；
4) Optimal Parameters, constraint condition and objective function are determined
Optimal Parameters are bushing wall thickness h1, bushing dog-ear length f2 and angle, rivet nut transition section length and angle；
Constraint condition are as follows:
(σ22/YT)2+(σ12/S12)2+(σ23/S23)2<1
(σ22/Yc)2+(σ12/S12)2+(σ23/S23)2<1
(σ11/Xc)2<1
(σ11/YT)2+(σ12/S12)2+(σ13/S13)2<1
(σ11/Yc)2+(σ12/S12)2+(σ13/S13)2<1
(σ33/Zc)2+(σ13/S13)2+(σ23/S23)2<1
Objective function are as follows: the stress-strain state of pretightning force f and each components；
Wherein XT、Xc、YT、Yc、Zc、S12、S13、S13Respectively represent 1 direction tensile ultimate strength of composite material, the compression of 1 direction
Ultimate strength, 2 direction tensile ultimate strengths, 2 direction compressive ultimate strengths, 3 direction compressive ultimate strengths, the 12 plane shear limit
Intensity, 13 plane shear ultimate strengths, 23 plane shear ultimate strengths；
By repeatedly simulating to obtain under the conditions of meeting the selected components strength of materials, bent especially no more than expansion bushing
Take intensity σbUnder the premise of, find out suitable bushing wall thickness h1；And bushing dog-ear and linkage section meet n1: n2It is obtained when proportionate relationship
To preferable installation effect, reach compared with high pretightening force effect.The present invention is a kind of novel single-side pumping nail rivet arrangement and its design
Method carries out reasonable connection design using interference engagement connection type, and larger pretightning force can be provided simultaneously, be used for by designing
The novel single-side pumping nail rivet of interference connection has the advantage that compared to general connection
First, so that composite material connected piece is formed interference connection, improves the fatigue life of composite material connected piece；
Second, this architecture provides certain pretightning forces, improve the bonding strength of composite material connected piece.According to this
The requirement of catenation principle and composite material the interference connection of structure, establishes each component design method of unilateral pumping nail rivet.
Third, in entire assembling process, expansion bushing main function is to keep entire connection structure in thickness of interlayer
Upper to generate uniform amount of interference, material can greatly improve tired service life under ringing.
4th, components are reduced, easy for installation, versatile, while having that intensity is high, riveting is reliable, operation side
Just, the features such as installation effectiveness is high, while, subsequent processing work all very small to the damage of connector and rivet nut after being installed
Sequence is reduced.
Detailed description of the invention
Illustrate the embodiment of the present invention or technical solution in the prior art in order to clearer, to embodiment or will show below
Have in technical description it is required use attached drawing does simple introduction, it is clear that, the accompanying drawings in the following description be only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other accompanying drawings.
Fig. 1 is riveting scheme of installation of the invention；
Fig. 2 is rivet arrangement schematic diagram of the invention；
Fig. 3 is the structural schematic diagram of core bar in the present invention；
Fig. 4 is rivet nut structural schematic diagram in the present invention；
Fig. 5 is bush structure schematic diagram of the invention；
Fig. 6 is driving nut effect diagram of the invention；
Fig. 7 is implementation result schematic diagram before installation of the present invention on interlayer；
Fig. 8 is present invention implementation result schematic diagram after the completion of clamping；
In figure: 1, core bar；2, bushing；3, rivet nut；4, nut is driven；5, core bar T connector portion；6, core bar polished rod break；7, core
Bar thread segment；8, core bar gripping section；9, rivet nut chamfering；10, rivet nut boss face；11, rivet nut circular arc；12, bushing boss face；13,
The end conical surface；
Specific embodiment
The attached drawing in example is applied below in conjunction with the present invention, the technical solution of the invention applied in example is carried out clear, complete
Narration, it is clear that described embodiment is only a part of the embodiments of the present invention, rather than all.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention, in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the following description, many details are elaborated to facilitate a thorough understanding of the present invention, still the present invention can be with
Implemented using other than the one described here other modes, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
Secondly, combination schematic diagram of the present invention is described in detail, when being described in detail, for purposes of illustration only, indicating device structure
Sectional view can not make partial enlargement according to general proportion, and the schematic diagram is example, should not limit this hair herein
The range of bright protection.In addition, the three-dimensional dimension of length, width and height should be included in actual fabrication.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
Based on orientation or positional relationship shown in attached drawing, it is merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion
Signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this
The limitation of invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply opposite
Importance or the quantity for implicitly indicating indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can be with
Express or what is implied includes one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should do sensu lato understanding, for example may be a fixed connection, it is understood that for dismountable connection；It can be with
It is mechanical connection, is also possible to be electrically connected；It can be directly connected, be also possible to be indirectly connected.For the common skill of this field
For art personnel, concrete meaning of the above-mentioned term in this invention can also be understood by concrete condition.
Such as Fig. 1 to Fig. 8, a kind of unilateral pumping nail rivet for composite material connection, including expansion bushing, threaded core
Four bar, driving nut, rivet nut components are constituted.Core bar is made of head and bar portion, and bar portion is equipped with close to core bar head one end
External screw thread and smooth bar part；Expansion bushing is boring structure, is covered outside core bar, and one end is large-diameter annual, the other end with
Core bar T forming head portion offsets, and forms the certain angle conical surface, while expansion bushing internal diameter is slightly less than rivet nut outer diameter, and when installation is following closely
Radial deformation occurs under the action of body to achieve the purpose that nail hole interference engagement；Rivet nut is hollow cylindrical pore structure, and swollen
It is large-diameter annual end face that swelling lining, which covers similar one end, is engaged with driving nut, by screw on nut until resisting rivet nut end
Face band moving nail body interference enters expansion bushing；The one end matched with bushing, rivet nut end be equipped with transition chamfering, convenient for rivet nut into
Enter in expansion bushing；Rivet driving nut is threadedly coupled with core bar, driving nut inner thread major diameter size and core bar threads
Major diameter is consistent.
It is now illustrated by taking a complete rivet as an example, core bar is inserted into composite material hole before installation, successively by bushing, nail
Body is placed on core bar bar portion, screws in driving nut from core bar endpiece, until resisting rivet nut end face, nut drives rivet nut precession, and makes
It obtains bushing circumferential expansion and forms interference engagement, at the same time core bar tension, it is big to form diameter for fold inward at the dog-ear of bushing one end
In aperture end face, it is buckled in composite facing, when reaching preset clamping torque, is broken, is installed at core bar.
The structure design and design method of unilateral pumping nail rivet are connected based on composite material, comprising the following steps:
Step 1: the Preliminary design of composite laminated plate jointing:
When designing fastener sizes structure, it is first determined aperture size is connected required for laminate, if required connection is laminated
Panel aperture is D0, it is usually to squeeze to destroy, therefore wanted according to composite Materials Design handbook that fastener, which connects acceptable failure mode,
It asks, laminate end diameter ratio e/D need to be met0>=3, width-diameter ratio w/D0>=4 design size, while to meet aperture and connection plate thickness
Degree ratio is 1≤(D0/t)≤2。
Assuming that required connection composite panel veneer plate thickness is t/2, then two plates connection overall thickness is t, composite panel
Aperture is D0；Jointing size is determined, then can design bushing relative dimensions.Fastener connect amount of interference usually withIt defines, therefore unilateral pumping nail rivet nail hole relative interference amountIt is wherein swollen
Swollen bushing inner diameter is d, and outer diameter D, rivet nut outer diameter is D2, while the part of expansion expansion sleeve, chamfering are played in rivet nut front end
For a；
Step 2: expansion bushing size design:
1) Outer Diameter of lining size design:
Composite material aperture is D0, convenient for bushing installation when embedded hole in, if expansion bushing outer diameter be D, bushing initially with
Interporal lacuna cooperation, fit tolerance are+0.1/0mm.
2) bushing wall thickness size design:
Interfere the research of mating connection damage mechanics according to composite material, evaluates, choose according to structural mechanics and the mechanics of materials
It is suitable for amount of interference I, if expansion bushing wall thickness is h1, obtaining expansion bushing internal diameter is d=D-2h1。
3) gasket end dog-ear size design:
Known connected plate overall thickness is t, and expansion bushing total length is L, takes expansion bushing left side boss with a thickness of S,
L1Equal to segment length among expansion bushing.In order to form the inside dog-ear in end, if length needed for expansion sleeve linkage section stretching plate thickness
Degree is f1, then f1=M-S-t, and dog-ear segment length is f2, then f2=L-M, angle a1。
Step 3: rivet nut size design:
1) rivet nut outer diameter designs:
Opening diameter D0, expansion bushing internal diameter d is I according to the connection relative interference amount selected, rivet nut outer diameter is calculated
D2；
2) rivet nut internal diameter designs:
Taking rivet nut wall thickness is h2, then rivet nut internal diameter D1=D2-2h2；Rivet nut front end changeover portion partial-length is L2, then L2=
L3-L4, angle a.
Step 4: nut and core bar size design:
1) threaded core bar size design:
Core bar and rivet nut clearance fit, core bar head diameter D=D0, secondly required according to suitable draw ratio, design meets
Coupling part size, total length are set as C.
2) nut size design is driven:
The driving nut to be matched according to the core bar thread size of above-mentioned design, selection with core bar threads.
Step 5: determination is optimized to the unilateral pumping nail rivet arrangement size of Preliminary design
1) establish threedimensional model using ABAQUS: fibre reinforced composites use solid modelling, and call three-dimensional
Hashin loss starting criterion simulates the damage and failure of composite material, and unilateral each components of pumping nail rivet are built using entity
Mould；
2) boundary condition of connection structure, due to being the fastener of Preliminary design, in simulation, it is dry for Main Analysis
It relates to and is installed effect and each components meet with stresses state；
3) grid dividing of connection structure, to reduce influence of the mesh quality to calculated result, device to hole week region and each
Components carry out mesh refinement, are roughened far from join domain grid；
4) Optimal Parameters, constraint condition and objective function are determined
Optimal Parameters are bushing wall thickness h1, bushing dog-ear length f2 and angle, rivet nut transition section length and angle；
Constraint condition are as follows:
(σ22/YT)2+(σ12/S12)2+(σ23/S23)2<1
(σ22/Yc)2+(σ12/S12)2+(σ23/S23)2<1
(σ11/Xc)2<1
(σ11/YT)2+(σ12/S12)2+(σ13/S13)2<1
(σ11/Yc)2+(σ12/S12)2+(σ13/S13)2<1
(σ33/Zc)2+(σ13/S13)2+(σ23/S23)2<1
Objective function are as follows: the stress-strain state of pretightning force f and each components；
Wherein XT、Xc、YT、Yc、Zc、S12、S13、S13Respectively represent 1 direction tensile ultimate strength of composite material, the compression of 1 direction
Ultimate strength, 2 direction tensile ultimate strengths, 2 direction compressive ultimate strengths, 3 direction compressive ultimate strengths, the 12 plane shear limit
Intensity, 13 plane shear ultimate strengths, 23 plane shear ultimate strengths；
By repeatedly simulating to obtain under the conditions of meeting the selected components strength of materials, bent especially no more than expansion bushing
Take intensity σbUnder the premise of, find out suitable bushing wall thickness h1；And bushing dog-ear and linkage section meet n1: n2It is obtained when proportionate relationship
To preferable installation effect, reach compared with high pretightening force effect.
As shown in Figure 1, the present invention includes core bar 1 and the expansion bushing 2 being sequentially sleeved on the core bar 1, rivet nut 3 and drives
Dynamic nut 4；
As shown in Fig. 2, the core bar 1 is made of T connector portion and screw rod, the bar portion endpiece is equipped with gripping section 8, interlude
It is divided into smooth section 5 and mid-section threads 7, external screw thread and driving nut thread cooperation in the core bar middle section 7；
As shown in figure 3, the rivet nut 3 is hollow end face tapered cylinders, right end is equipped with filleted transition 9, and left end is
Major diameter end face 10 resists precession bushing convenient for nut, and rivet nut installs protheca on core bar；
As shown in figure 4, the bushing 2 is hollow cylindrical, left end is equipped with major diameter end face 12, and right end is certain angle
The conical surface, resist infolding when core bar generates relative displacement and strut into shim-like, while bushing inner diameter is less than rivet nut internal diameter, formed
Interference connection；
As shown in figure 5, the internal screw thread of the driving nut 4 of the hexagonal internal thread structure and middle section and the head of the core bar 1
The external screw thread of section is mutually matched；
Its working principle is that: driving nut is connect with threaded core bar by screw thread pair, and core bar, rotation driving spiral shell are clamped
Mother, relative motion make that nut is driven to push rivet nut along threaded core bar, move to expansion bushing, expansion bushing is by thread core
Boom end effect of contraction cannot move, and therefore, the axial movement of rivet nut causes expansion bushing radial deformation, realize composite wood
Material interference connection.Meanwhile close to core bar head one end larger radial deformation occurs for expansion bushing, clamps connected piece.
When installing and using, installation process is divided into three phases completion, first prepares assembled structure insertion in advance
In the riveted holes of good sandwich plate (component to be riveted), driving nut is threaded to offset with rivet nut raised land 9, is pressed from both sides with installation tool
Core bar endpiece, rotation driving nut are handled, nut drives rivet nut precession expansion bushing, this screws in the stage for rivet nut.Then in spiral shell
Under the action of line pair, rivet nut screws in bushing inner hole, while core bar 1 opposite can drive nut 4 to generate axial displacement, extract out outward,
1 suit of of core bar upper bushing can synchronize axial displacement with entire core bar simultaneously, extract out outward；When rivet nut 3 starts inlay busher,
Rivet nut one end is equipped with end-beveling changeover portion, enters convenient for interference, and prevents from initially installing and initially serve as a contrast to laminate and expansion
Set causes to damage；The 2 right end conical surface of bushing, the outside extraction process of core bar to a certain extent, resist bushing conical surface one end, and end face occurs
Varus deformation, this is big footing shaping stage；Finally, due to squeezing action while both ends, bushing after forming flaring, after
Continuous axial displacement, until resisting the T connector portion of core bar terminates, after forming end face, core bar continuation pumpback, but bushing varus
It forms on the whole foot face and has resisted riveting part, until formation shim-like, clasp interlayer plate end face and form certain preload, due to
In place, core bar 1 reaches predetermined and twists off torque, core bar fracture retraction, to reach riveting, this is to be installed the fracture stage.
The embodiments of the present invention have been described in detail above, but the content is the preferable embodiment invented,
It is not to be regarded as limiting practical range of the invention.In every case all the changes and improvements etc. done according to the present patent application range,
It belongs within covering scope of the invention.
Claims (7)
1. a kind of unilateral pumping nail rivet arrangement of composite material, including core bar (1), it is characterised in that: the end of the core bar (1)
Equipped with T connector portion (6), screw thread is offered at the center of the core bar (1), core bar (1) side wall is divided into core bar light bar segment
(5), core bar thread segment (7) and gripping section (8), the core bar (1) are arranged with rivet nut (3) outside, and rivet nut (3) two sides are set respectively
There are bushing (2) and driving nut (4), the bushing (2) is externally provided with composite sandwich plate (14).
2. the unilateral pumping nail rivet arrangement of composite material according to claim 1, it is characterised in that: the core bar (1) with
The driving nut (4) is threadedly coupled.
3. the unilateral pumping nail rivet arrangement of composite material according to claim 1, it is characterised in that: the bushing (2)
Internal diameter is less than the outer diameter of the rivet nut (3).
4. the unilateral pumping nail rivet arrangement of composite material according to claim 1, it is characterised in that: the rivet nut (3) is
Hollow cylindrical pore structure, rivet nut (3) both ends are respectively equipped with rivet nut boss face (10) and rivet nut circular arc (11), the rivet nut
(3) rivet nut chamfering (9) are equipped with close to the position of the rivet nut circular arc (11).
5. the unilateral pumping nail rivet arrangement of composite material according to claim 1, it is characterised in that: the bushing (2) two
End is respectively equipped with bushing boss face (12) and the end conical surface (13).
6. the unilateral pumping nail rivet arrangement of composite material according to claim 1, it is characterised in that: the composite wood feed collet
Through-hole is offered at the center of laminate.
7. a kind of construction design method for connecting unilateral pumping nail rivet based on composite material, comprising the following steps:
Step 1: the Preliminary design of composite laminated plate jointing:
When designing fastener sizes structure, it is first determined aperture size is connected required for laminate, if required connection laminate hole
Diameter is D0, it is usually to squeeze to destroy, therefore required according to composite Materials Design handbook that fastener, which connects acceptable failure mode, is needed
Meet laminate end diameter ratio e/D0>=3, width-diameter ratio w/D0>=4 design size, while to meet aperture and connecting plate thickness ratio
For 1≤(D0/t)≤2；
Assuming that required connection composite panel veneer plate thickness is t/2, then two plates connection overall thickness is t, composite material panel aperture
For D0；Jointing size is determined, then can design bushing relative dimensions；Fastener connect amount of interference usually withIt defines, therefore unilateral pumping nail rivet nail hole relative interference amountIt is wherein swollen
Swollen bushing inner diameter is d, and outer diameter D, rivet nut outer diameter is D2, while the part of expansion expansion sleeve, chamfering are played in rivet nut front end
For a；
Step 2: expansion bushing size design:
1) Outer Diameter of lining size design
Composite material aperture is D0, convenient in embedded hole when bushing installation, if expansion bushing outer diameter is D, bushing is initially and interporal lacuna
Cooperation, fit tolerance are+0.1/0mm；
2) bushing wall thickness size design:
Interfere the research of mating connection damage mechanics according to composite material, evaluated according to structural mechanics and the mechanics of materials, selection is suitable for
Amount of interference I, if expansion bushing wall thickness is h1, obtaining expansion bushing internal diameter is d=D-2h1；
3) gasket end dog-ear size design:
Known connected plate overall thickness is t, and expansion bushing total length is L, takes expansion bushing left side boss with a thickness of S, L1It is equal to
Segment length among expansion bushing；In order to form the inside dog-ear in end, if length needed for expansion sleeve linkage section stretches out plate thickness is f1,
Then f1=M-S-t, dog-ear segment length are f2, then f2=L-M, angle a1；
Step 3: rivet nut size design:
1) rivet nut outer diameter designs:
Opening diameter D0, expansion bushing internal diameter d is I according to the connection relative interference amount selected, rivet nut outer diameter D is calculated2；
2) rivet nut internal diameter designs:
Taking rivet nut wall thickness is h2, then rivet nut internal diameter D1=D2-2h2；Rivet nut front end changeover portion partial-length is L2, then L2=L3-L4,
Angle is a；
Step 4: nut and core bar size design:
1) threaded core bar size design:
Core bar and rivet nut clearance fit, core bar head diameter D=D0, secondly required according to suitable draw ratio, design meets interconnecting piece
Divide size, total length is set as C；
2) nut size design is driven:
The driving nut to be matched according to the core bar thread size of above-mentioned design, selection with core bar threads；
Step 5: determination is optimized to the unilateral pumping nail rivet arrangement size of Preliminary design:
1) establish threedimensional model using ABAQUS: fibre reinforced composites use solid modelling, and three-dimensional Hashin is called to damage
It loses starting criterion to simulate the damage and failure of composite material, unilateral each components of pumping nail rivet use solid modelling；
2) boundary condition of connection structure, due to being the fastener of Preliminary design, its interference peace of Main Analysis in simulation
It installs into effect and each components meets with stresses state；
3) grid dividing of connection structure, to reduce influence of the mesh quality to calculated result, device to hole week region and zero each
Part carries out mesh refinement, is roughened far from join domain grid；
4) Optimal Parameters, constraint condition and objective function are determined:
Optimal Parameters are bushing wall thickness h1, bushing dog-ear length f2 and angle, rivet nut transition section length and angle；
Constraint condition are as follows:
(σ22/YT)2+(σ12/S12)2+(σ23/S23)2<1
(σ22/Yc)2+(σ12/S12)2+(σ23/S23)2<1
(σ11/Xc)2<1
(σ11/YT)2+(σ12/S12)2+(σ13/S13)2<1
(σ11/Yc)2+(σ12/S12)2+(σ13/S13)2<1
(σ33/Zc)2+(σ13/S13)2+(σ23/S23)2<1
Objective function are as follows: the stress-strain state of pretightning force f and each components；
Wherein XT、Xc、YT、Yc、Zc、S12、S13、S13Respectively represent 1 direction tensile ultimate strength of composite material, 1 direction compression limit
Intensity, 2 direction tensile ultimate strengths, 2 direction compressive ultimate strengths, 3 direction compressive ultimate strengths, the 12 plane shear limit are strong
Degree, 13 plane shear ultimate strengths, 23 plane shear ultimate strengths；
By repeatedly simulating to obtain under the conditions of meeting the selected components strength of materials, surrendered especially no more than expansion bushing strong
Spend σbUnder the premise of, find out suitable bushing wall thickness h1；And bushing dog-ear and linkage section meet n1: n2Obtained when proportionate relationship compared with
Good installation effect, reaches compared with high pretightening force effect.
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