CN104090998B - A kind of bolt coupling between bending and extension equivalent test method - Google Patents
A kind of bolt coupling between bending and extension equivalent test method Download PDFInfo
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- CN104090998B CN104090998B CN201410286019.7A CN201410286019A CN104090998B CN 104090998 B CN104090998 B CN 104090998B CN 201410286019 A CN201410286019 A CN 201410286019A CN 104090998 B CN104090998 B CN 104090998B
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Abstract
The present invention relates to a kind of bolt coupling between bending and extension equivalent test method, simulation analysis are carried out to bolt connection piece by finite element software, and additional bending moment test tool model is set up using finite element software, by adjusting imposed load parameter and physical dimension, the stress of bolt in the real bolt connection piece of accurate simulation, judge whether bolt connection piece meets design requirement by coupling between bending and extension equivalent test, so as to the stress of bolt when solving current connecting bolt local test cannot simulate a difficult problem for local connecting bolt real bearing state of the overall structure under the effect of axle curved scissors load, realize the test examination of bolt strength in true large-sized bolt attachment structure, Reliable guarantee is provided for true large-sized bolt attachment structure.
Description
Technical field
The present invention relates to a kind of bolt coupling between bending and extension equivalent test method, belongs to the connecting bolt local of bullet rocket body structure by force
Degree experimental design field.
Background technology
Bolt is widely used in rocket, the section of guided missile and part connecting structure, generally bolt strained state
For axle power, the symphyogenetic complicated applied force state of moment of flexure, especially in point type segregation apparatuss with bolts, bolt
Local bending moment is very big, it is difficult to determine its coupling between bending and extension in practical structures by the single load bearing ultimate load in designer's handbook
The lower bearing capacity of effect, whether which meets bearing capacity and requires to need to carry out verification experimental verification.In addition, according to existing model Jing
Test, when connecting bolt partial structurtes are intercepted out carry out local test when, the stress of bolt is curved in axle with overall structure
Local connecting bolt real bearing state under shearing load effect has a certain distance, needs design a kind of simple, general
Research technique come examine bolt coupling between bending and extension effect under bearing capacity.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, there is provided a kind of bolt coupling between bending and extension equivalent test side
Method, the method achieves the low-cost test examination of bolt strength in true large-sized bolt attachment structure, is true large-sized bolt
Attachment structure provides Reliable guarantee.
What the above-mentioned purpose of the present invention was mainly achieved by following technical solution：
A kind of bolt coupling between bending and extension equivalent test method, comprises the steps：
Step (one), simulation analysis are carried out to bolt connection piece by finite element software, obtain the drawing of connecting bolt sectional axis
Data and connecting bolt section turn moment data, and drawn as abscissa with connecting bolt sectional axis, connecting bolt section turn moment is vertical
Coordinate, draws curve 1；
Step (two), according to the physical dimension of upper bolt box, lower bolt box and connecting bolt in the bolt connection piece,
Set up additional bending moment test tool model using finite element software, the additional bending moment test tool model include bolt box,
Lower bolt box, cushion block and bolt, wherein upper bolt box is bolted with lower bolt box, cushion block is located at upper bolt box and lower spiral shell
Between bolt box, and positioned at the side of bolt；
Step (three), the additional bending moment test tool model is calculated using finite element software load F is drawn applying axlesUnder
Connecting bolt sectional axis draw data and connecting bolt section turn moment data, and drawn as abscissa with connecting bolt sectional axis, even
Connecting bolt section turn moment is vertical coordinate, draws curve 2, the curve 1 obtained in curve 2 and step () is contrasted,
If the error in data of two peak of curve points, end point is ≤5%, into step (four)；If two curve peaks
Value point data error≤5%, the error in data ＞ 5% of end point, then draw load F to the axle of applyingsIt is adjusted, return to step
(3)；If error in data≤5% of two peak of curve point data errors ＞ 5%, end point, using finite element software to institute
The size for stating the upper bolt box, lower bolt box and cushion block of additional bending moment test tool model is modified, return to step (three)；If
Two peak of curve points, the equal ＞ 5% of error in data of end point, then draw load F to the axle of applyingsIt is adjusted, while utilizing
Finite element software is repaiied to the physical dimension of the upper bolt box, lower bolt box and cushion block of the additional bending moment test tool model
Change, return to step (three)；
Step (four), additional bending moment test tool is prepared according to the additional bending moment test tool model that step (three) determines,
Carry out coupling between bending and extension equivalent test, obtain the ultimate bearing capacity parameter of connecting bolt, i.e., corresponding load when connecting bolt is broken
Lotus F；By load F, the final axle for determining draws load F with step (three)sContrasted, if F >=Fs, then in step (), bolt connects
Fitting meets design requirement, and otherwise, in step (), bolt connection piece is unsatisfactory for design requirement.
In above-mentioned bolt coupling between bending and extension equivalent test method, the additional bending moment test tool model set up in step (two)
In upper bolt box include base plate, backboard and two side plates, lower bolt box includes top board, backboard and two side plates, and cushion block is vertical
Cube structure, cushion block installation site avoid bolt.
In above-mentioned bolt coupling between bending and extension equivalent test method, the additional bending moment test tool model set up in step (two)
In upper bolt box base plate thickness, the top plate thickness of lower bolt box and pad thickness summation be equal to step () in bolt connect
Upper bolt box base plate thickness in fitting and lower bolt box top plate thickness sum.
In above-mentioned bolt coupling between bending and extension equivalent test method, to the upper of additional bending moment test tool model in step (three)
The size of bolt box, lower bolt box and cushion block is modified, i.e., the base plate, side plate thickness to upper bolt box, the top of lower bolt box
Plate, side plate thickness and pad thickness are adjusted, while needing to meet the upper bolt box in additional bending moment test tool model
The summation of base plate thickness, the top plate thickness of lower bolt box and pad thickness is equal to the upper bolt in bolt connection piece in step ()
Cassette bottom plate thickness and lower bolt box top plate thickness sum.
The present invention is had the advantages that compared with prior art：
(1), the present invention carries out simulation analysis by finite element software to bolt connection piece, and is set up using finite element software
Additional bending moment test tool model, by adjusting imposed load parameter and physical dimension, the real bolt connection piece of accurate simulation
By coupling between bending and extension equivalent test, the stress of middle bolt, judges whether bolt connection piece meets design requirement, so as to solve
During current connecting bolt local test, the stress of bolt cannot simulate office of the overall structure under the effect of axle curved scissors load
A difficult problem for portion's connecting bolt real bearing state, realizes the test examination of bolt strength in true large-sized bolt attachment structure,
Reliable guarantee is provided for true large-sized bolt attachment structure；
(2), stress shape of the present invention using bolt in the real bolt connection piece of additional bending moment test tool modeling
State, test tool also add cushion block except including in addition to upper and lower bolt box, so as to increased the adjustable ginseng during EXPERIMENTAL DESIGN
Number, improves the accuracy of bolt strained state simulation；
(3), the present invention designs additional bending moment test tool model by finite element software, and prepares local test frock,
Coupling between bending and extension equivalent test is carried out, experimentation cost is greatly reduced, benefit is improve, with stronger practicality；
The present invention is applied in the connecting bolt local strength test of multiple carrier rocket models, is achieved very well
Effect.
Description of the drawings
Fig. 1 is additional bending moment test tool model axonometric chart of the present invention；
Fig. 2 is additional bending moment test tool profile of the present invention (front view and sectional side view)；
Fig. 3 is curve 1 in the present invention and 2 comparison diagram of curve.
Specific embodiment
Further detailed description is done to the present invention with specific embodiment below in conjunction with the accompanying drawings：
Bolt coupling between bending and extension equivalent test method of the present invention, specifically includes following steps：
Step (one), simulation analysis are carried out to true bolt connection piece by finite element software, obtain connecting bolt section
Axle draws data and connecting bolt section turn moment data, and is drawn as abscissa with connecting bolt sectional axis, connecting bolt section turn moment
For vertical coordinate, curve 1 is drawn, be illustrated in figure 3 curve 1 and 2 comparison diagram of curve in the present invention.
Step (two), according to the physical dimension of upper bolt box, lower bolt box and bolt in true bolt connection piece, utilize
Finite element software sets up additional bending moment test tool model.It is illustrated in figure 1 additional bending moment test tool model of the present invention three-dimensional
Figure, Fig. 2 show additional bending moment test tool profile of the present invention (front view and sectional side view)；The additional bending moment test work of foundation
The base plate thickness of the upper bolt box 1 in die-filling type, the summation of 3 thickness of the top plate thickness of lower bolt box 2 and cushion block are equal to true spiral shell
Tether the upper bolt box base plate thickness and lower bolt box top plate thickness sum in fitting.
As shown in Figure 1, 2, additional bending moment test tool model includes bolt box 1, lower bolt box 2, cushion block 3 and bolt 4,
Wherein go up bolt box 1 to be connected by bolt 4 with lower bolt box 2, cushion block 3 is located between upper bolt box 1 and lower bolt box 2, and position
In the side (bolt 4 does not pass through cushion block 3) of bolt 4.Upper bolt box 1 in the additional bending moment test tool model of foundation includes bottom
Plate, backboard and two side plates, lower bolt box 2 include top board, backboard and two side plates, and cushion block 3 is cube structure, installation site
Avoid bolt 4.
Step (three), using finite element software calculate additional bending moment test tool model apply axle draw load FsUnder company
Connecting bolt sectional axis draw data and connecting bolt section turn moment data, and are drawn as abscissa with connecting bolt sectional axis, connect spiral shell
Bolt section turn moment is vertical coordinate, draws curve 2.
And curve 2 is contrasted with curve 1, if as shown in figure 3, two peak of curve points, the error in datas of end point
≤ 5%, then into step (four)；If two peak of curve point data error≤5%, the error in data ＞ 5% of end point,
Axle to applying draws load FsIt is adjusted, return to step (three)；If two peak of curve point data errors ＞ 5%, end point
Error in data≤5%, then upper bolt box 1, the lower bolt using finite element software to the additional bending moment test tool model
The size of box 2 and cushion block 3 is modified, return to step (three)；If two peak of curve points, the equal ＞ of error in data of end point
5%, then load F is drawn to the axle of applyingsIt is adjusted, while using finite element software to the additional bending moment test tool model
The physical dimension of upper bolt box 1, lower bolt box 2 and cushion block 3 modify, return to step (three).
The size of the upper bolt box 1, lower bolt box 2 and cushion block 3 of additional bending moment test tool model is carried out in the step
Modification, i.e., the base plate, side plate thickness to upper bolt box 1, the thickness of the top board, side plate thickness and cushion block 3 of lower bolt box 2 are adjusted
It is whole, while needing to meet following relation：
Top plate thickness+the cushion block 3 of the base plate thickness of the upper bolt box 1 in additional bending moment test tool model+lower bolt box 2
Thickness=true bolt connection piece in upper bolt box base plate thickness+lower bolt box top plate thickness.
As shown in figure 3, curve 1 and 2 peak point error in data ε of curve in the present embodiment1＜ 5%；The peak value of curve 1 is set
Point abscissa is a1, vertical coordinate be b1, the peak point abscissa of curve 2 is a2, vertical coordinate be b2, then：
The error in data ε of curve 1 and 2 end point of curve2＞ 5%；The end point abscissa of curve 1 is set as c1, vertical coordinate
For d1, the end point abscissa of curve 2 is c2, vertical coordinate be d2, then：
Therefore the axle to applying only is needed to draw load FsIt is adjusted, return to step (three) re-starts FEM calculation.Directly
To the error in data of two peak of curve points, end point is met respectively less than equal to 5%, into step (four).
Step (four), additional bending moment test tool is prepared according to the additional bending moment test tool model that step (three) determines,
Carry out coupling between bending and extension equivalent test, obtain the ultimate bearing capacity parameter of connecting bolt, i.e., corresponding load when connecting bolt is broken
Lotus F；By load F and the final F for determining in step (three)sContrasted, if F >=Fs, then in step (), bolt connection piece meets
Design requirement, otherwise, in step (), bolt connection piece is unsatisfactory for design requirement.
F ＞ F in the present embodiments, then in judging step (), true bolt connection piece meets design requirement.
The above, optimal specific embodiment only of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (4)
1. a kind of bolt coupling between bending and extension equivalent test method, it is characterised in that：Comprise the steps：
Step (one), simulation analysis are carried out to bolt connection piece by finite element software, obtain connecting bolt sectional axis and draw data
With connecting bolt section turn moment data, and with connecting bolt sectional axis draw as abscissa, connecting bolt section turn moment be vertical coordinate,
Draw curve 1；
Step (two), according to the physical dimension of upper bolt box, lower bolt box and connecting bolt in the bolt connection piece, utilize
Finite element software sets up additional bending moment test tool model, the additional bending moment test tool model include bolt box (1), under
Bolt box (2), cushion block (3) and bolt (4), wherein upper bolt box (1) is connected by bolt (4) with lower bolt box (2), cushion block
(3) between upper bolt box (1) and lower bolt box (2), and it is located at the side of bolt (4)；
Step (three), the additional bending moment test tool model is calculated using finite element software load F is drawn applying axlesUnder company
Connecting bolt sectional axis draw data and connecting bolt section turn moment data, and are drawn as abscissa with connecting bolt sectional axis, connect spiral shell
Bolt section turn moment is vertical coordinate, draws curve 2, and the curve 1 obtained in curve 2 and step () is contrasted,
If the error in data of two peak of curve points, end point is ≤5%, into step (four)；If two peak of curve points
The error in data ＞ 5% of error in data≤5%, end point, then draw load F to the axle of applyingsIt is adjusted, return to step
(3)；If error in data≤5% of two peak of curve point data errors ＞ 5%, end point, using finite element software to institute
The size for stating the upper bolt box (1), lower bolt box (2) and cushion block (3) of additional bending moment test tool model is modified, and returns step
Suddenly (three)；If two peak of curve points, the equal ＞ 5% of error in data of end point, the axle to applying draws load FsIt is adjusted,
Simultaneously using finite element software to the upper bolt box (1) of the additional bending moment test tool model, lower bolt box (2) and cushion block
(3) physical dimension is modified, return to step (three)；
Step (four), additional bending moment test tool is prepared according to the additional bending moment test tool model that step (three) determines, carried out
Coupling between bending and extension equivalent test, obtains the ultimate bearing capacity parameter of connecting bolt, i.e., corresponding load F when connecting bolt is broken；
By load F, the final axle for determining draws load F with step (three)sContrasted, if F >=Fs, then bolt connection piece in step ()
Meet design requirement, otherwise, bolt connection piece is unsatisfactory for design requirement in step ()；
In the step (three), if the peak point abscissa of curve 1 is a1, vertical coordinate be b1, the peak point abscissa of curve 2 is
a2, vertical coordinate be b2, then the error in data ε of curve 1 and 2 peak point of curve1It is expressed as follows：
If the end point abscissa of curve 1 is c1, vertical coordinate be d1, the end point abscissa of curve 2 is c2, vertical coordinate be d2, then
The error in data ε of curve 1 and 2 end point of curve2It is expressed as follows：
2. a kind of bolt coupling between bending and extension equivalent test method according to claim 1, it is characterised in that：The step (two)
Upper bolt box (1) in the additional bending moment test tool model of middle foundation includes base plate, backboard and two side plates, lower bolt box
(2) including top board, backboard and two side plates, cushion block (3) is cube structure, and cushion block (3) installation site avoids bolt (4).
3. a kind of bolt coupling between bending and extension equivalent test method according to claim 1 and 2, it is characterised in that：The step
(2) base plate thickness of the upper bolt box (1) in the additional bending moment test tool model set up in, the top board of lower bolt box (2) are thick
The summation of degree and cushion block (3) thickness is equal to the upper bolt box base plate thickness in bolt connection piece in step () and lower bolt box top
Plate thickness sum.
4. a kind of bolt coupling between bending and extension equivalent test method according to claim 1, it is characterised in that：The step (three)
In the size of the upper bolt box (1), lower bolt box (2) and cushion block (3) of additional bending moment test tool model is modified, i.e., it is right
The base plate of upper bolt box (1), side plate thickness, the top board of lower bolt box (2), side plate thickness and cushion block (3) thickness are adjusted, together
When need to meet base plate thickness, the top plate thickness of lower bolt box (2) of the upper bolt box (1) in additional bending moment test tool model
The upper bolt box base plate thickness and lower bolt box top board being equal in step () with the summation of cushion block (3) thickness in bolt connection piece
Thickness sum.
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| CN201410286019.7A CN104090998B (en) | 2014-06-24 | 2014-06-24 | A kind of bolt coupling between bending and extension equivalent test method |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103091122A (en) * | 2013-01-08 | 2013-05-08 | 北京工业大学 | Diagnostic method of space gridding structure node bolt loosening injury |
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| JP5435807B2 (en) * | 2010-09-27 | 2014-03-05 | 本田技研工業株式会社 | Structural analysis method of screw fastening part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103091122A (en) * | 2013-01-08 | 2013-05-08 | 北京工业大学 | Diagnostic method of space gridding structure node bolt loosening injury |
Non-Patent Citations (4)
| Title |
|---|
| 典型爆炸螺栓承载能力研究;侯传涛等;《强度与环境》;20110815;第38卷(第4期);第32-37页 * |
| 基于结构优化技术的等效刚度试验边界设计方法;王斌等;《北京力学会第19届学术年会论文集》;20130112;第26-27页 * |
| 小变形下螺栓法兰连接结构的静刚度非线性特性;栾宇等;《强度与环境》;20110615;第38卷(第3期);第29-35页 * |
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