CN104090998A - Equivalent test method for bolt stretching-bending coupling - Google Patents
Equivalent test method for bolt stretching-bending coupling Download PDFInfo
- Publication number
- CN104090998A CN104090998A CN201410286019.7A CN201410286019A CN104090998A CN 104090998 A CN104090998 A CN 104090998A CN 201410286019 A CN201410286019 A CN 201410286019A CN 104090998 A CN104090998 A CN 104090998A
- Authority
- CN
- China
- Prior art keywords
- bolt
- coupling
- box
- bolt box
- test tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to an equivalent test method for bolt stretching-bending coupling. According to the equivalent test method for bolt stretching-bending coupling, a simulation analysis is carried out on a bolt connecting element by finite element software, an additional moment test fixture model is established by the finite element software, the stressed state of a bolt in the real bolt connecting element is accurately simulated by adjusting applying load parameters and structural dimensions, and whether the bolt connecting element meets design requirements or not is judged by a stretching-bending coupling equivalent test, thus solving the problem that the stressed state of a bolt in the present connecting bolt partial test is incapable of simulating the real stressed state of a partial connecting bolt of the overall structure under the action of a shaft bending shear load, realizing test and examination for the strength of the bolt in a real large bolt connecting structure, and providing a reliable guarantee on the real large bolt connecting structure.
Description
Technical field
The present invention relates to a kind of bolt coupling between bending and extension equivalent test method, belong to the coupling bolt local strength test design field that plays rocket body structure.
Background technology
Bolt is widely used in portion's section and part connecting structure of rocket, guided missile, generally bolt strained state is the symphyogenetic complicated applied force state of axle power, moment of flexure, especially in point type tripping device with bolts, the local moment of flexure of bolt is very large, be difficult to determine its load-bearing capacity under coupling between bending and extension effect in practical structures by the single load bearing ultimate load in designer's handbook, whether it meets load-bearing capacity requirement need to carry out verification experimental verification.In addition, according to existing model experience, when coupling bolt partial structurtes being intercepted out while carrying out local test, the stress of bolt and the one-piece construction local coupling bolt real bearing state under axle curved scissors load has a certain distance, need to design a kind of simple, general research technique and examine the load-bearing capacity of bolt under coupling between bending and extension effect.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, a kind of bolt coupling between bending and extension equivalent test method is provided, the method has realized the low-cost test examination of bolt strength in true large-sized bolt syndeton, for true large-sized bolt syndeton provides Reliable guarantee.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A bolt coupling between bending and extension equivalent test method, comprises the steps:
Step (one), by finite element software, bolt connection piece is carried out to simulation analysis, obtain coupling bolt sectional axis and draw data and coupling bolt cross section moment of flexure data, and take coupling bolt sectional axis and draw as horizontal ordinate, coupling bolt cross section moment of flexure is ordinate, curve plotting 1;
The physical dimension of step (two), the upper bolt box according in described bolt connection piece, lower bolt box and coupling bolt, utilize finite element software to set up additional bending moment test tool model, described additional bending moment test tool model comprises bolt box, lower bolt box, cushion block and bolt, wherein go up bolt box and lower bolt box is bolted, cushion block, between upper bolt box and lower bolt box, and is positioned at a side of bolt;
Step (three), utilize finite element software to calculate described additional bending moment test tool model to draw load F applying axle
sunder coupling bolt sectional axis draw data and coupling bolt cross section moment of flexure data, and take coupling bolt sectional axis and draw as horizontal ordinate, coupling bolt cross section moment of flexure is ordinate, curve plotting 2,, the curve 1 obtaining in curve 2 and step () is contrasted,
If two the data error of peak of curve point, end point all≤5%, enters step (four); If two the data error > 5% of peak of curve point data error≤5%, end point, draws load F to the axle applying
sadjust, return to step (three); If data error≤5% of peak of curve point data error > 5%, end point two, utilize finite element software to modify to the size of the upper bolt box of described additional bending moment test tool model, lower bolt box and cushion block, return to step (three); If two the equal > 5% of the data error of peak of curve point, end point, draws load F to the axle applying
sadjust, utilize finite element software to modify to the physical dimension of the upper bolt box of described additional bending moment test tool model, lower bolt box and cushion block simultaneously, return to step (three);
Step (four), according to the definite additional bending moment test tool model of step (three), prepare additional bending moment test tool, carry out coupling between bending and extension equivalent test, obtain the ultimate bearing capacity parameter of coupling bolt, corresponding load F when coupling bolt is broken; Final definite axle in load F and step (three) is drawn to load F
scontrast, if F>=F
s, in step (), bolt connection piece meets design requirement, otherwise in step (), bolt connection piece does not meet design requirement.
In above-mentioned bolt coupling between bending and extension equivalent test method, upper bolt box in the additional bending moment test tool model of setting up in step (two) comprises base plate, backboard and two side plates, lower bolt box comprises top board, backboard and two side plates, cushion block is cube structure, and bolt is avoided in cushion block installation site.
In above-mentioned bolt coupling between bending and extension equivalent test method, the base plate thickness of upper bolt box in the additional bending moment test tool model of setting up in step (two) is, the summation of the top plate thickness of lower bolt box and pad thickness equals upper bolt box base plate thickness and the lower bolt box top plate thickness sum in bolt connection piece in step ().
In above-mentioned bolt coupling between bending and extension equivalent test method, in step (three), the size of the upper bolt box of additional bending moment test tool model, lower bolt box and cushion block is modified, to the base plate of upper bolt box, side plate thickness, the top board of lower bolt box, side plate thickness and pad thickness are adjusted, and need to meet the base plate thickness of upper bolt box in additional bending moment test tool model, the summation of the top plate thickness of lower bolt box and pad thickness equals upper bolt box base plate thickness and the lower bolt box top plate thickness sum in bolt connection piece in step () simultaneously.
The present invention compared with prior art has following beneficial effect:
(1), the present invention carries out simulation analysis by finite element software to bolt connection piece, and utilize finite element software to set up additional bending moment test tool model, by adjusting imposed load parameter and physical dimension, the stress of bolt in accurate bolt connection piece that is virtually reality like reality, by coupling between bending and extension equivalent test, judge whether bolt connection piece meets design requirement, thereby while having solved current coupling bolt local test, the stress of bolt cannot be simulated a difficult problem for the local coupling bolt real bearing state of one-piece construction under axle curved scissors load, realized the test examination of bolt strength in true large-sized bolt syndeton, for true large-sized bolt syndeton provides Reliable guarantee,
(2), the present invention adopts the stress of bolt in the real bolt connection piece of additional bending moment test tool modeling, test tool is except comprising upper and lower bolt box, also increased cushion block, thereby increased the adjustable parameter in test design process, improved 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, carries out coupling between bending and extension equivalent test, greatly reduces experimentation cost, improved benefit, has stronger practicality;
The present invention is applied in the coupling bolt local strength test of a plurality of carrier rocket models, has obtained good effect.
Accompanying drawing explanation
Fig. 1 is additional bending moment test tool model stereographic map of the present invention;
Fig. 2 is additional bending moment test tool sectional view of the present invention (front elevation and sectional side view);
Fig. 3 is curve 1 and curve 2 comparison diagrams in the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to further detailed description:
Bolt coupling between bending and extension equivalent test method of the present invention, specifically comprises the steps:
Step (one), by finite element software, true bolt connection piece is carried out to simulation analysis, obtain coupling bolt sectional axis and draw data and coupling bolt cross section moment of flexure data, and take coupling bolt sectional axis and draw as horizontal ordinate, coupling bolt cross section moment of flexure is ordinate, curve plotting 1, is illustrated in figure 3 curve 1 and curve 2 comparison diagrams in the present invention.
The physical dimension of upper bolt box, lower bolt box and bolt in step (two), the true bolt connection piece of basis, utilizes finite element software to set up additional bending moment test tool model.Be illustrated in figure 1 additional bending moment test tool model stereographic map of the present invention, Figure 2 shows that additional bending moment test tool sectional view of the present invention (front elevation and sectional side view); The base plate thickness of upper bolt box 1 in the additional bending moment test tool model of setting up is, the summation of the top plate thickness of lower bolt box 2 and cushion block 3 thickness equals upper bolt box base plate thickness and the lower bolt box top plate thickness sum in true bolt connection piece.
As shown in Figure 1, 2, additional bending moment test tool model comprises bolt box 1, lower bolt box 2, cushion block 3 and bolt 4, wherein going up 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 is positioned at the side (bolt 4 through cushion block 3) of bolt 4.Upper bolt box 1 in the additional bending moment test tool model of setting up comprises base plate, backboard and two side plates, and lower bolt box 2 comprises top board, backboard and two side plates, and cushion block 3 is cube structure, and bolt 4 is avoided in installation site.
Step (three), utilize finite element software to calculate additional bending moment test tool model to draw load F applying axle
sunder coupling bolt sectional axis draw data and coupling bolt cross section moment of flexure data, and take coupling bolt sectional axis and draw as horizontal ordinate, coupling bolt cross section moment of flexure is ordinate, curve plotting 2.
And curve 2 and curve 1 are contrasted, as shown in Figure 3, if the data error of two peak of curve points, end point is all≤5%, enter step (four); If two the data error > 5% of peak of curve point data error≤5%, end point, draws load F to the axle applying
sadjust, return to step (three); If data error≤5% of peak of curve point data error > 5%, end point two, utilize finite element software to modify to the size of the upper bolt box 1 of described additional bending moment test tool model, lower bolt box 2 and cushion block 3, return to step (three); If two the equal > 5% of the data error of peak of curve point, end point, draws load F to the axle applying
sadjust, utilize finite element software to modify to the physical dimension of the upper bolt box 1 of described additional bending moment test tool model, lower bolt box 2 and cushion block 3 simultaneously, return to step (three).
In this step, the size of the upper bolt box 1 of additional bending moment test tool model, lower bolt box 2 and cushion block 3 is modified, to the base plate of upper bolt box 1, side plate thickness, the thickness of the top board of lower bolt box 2, side plate thickness and cushion block 3 is adjusted, and needs to meet following relation simultaneously:
Upper bolt box base plate thickness+lower bolt box top plate thickness in the thickness of the top plate thickness+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=true bolt connection piece.
As shown in Figure 3, curve 1 and curve 2 peak point data error ε in the present embodiment
1< 5%; The peak point horizontal ordinate of establishing curve 1 is a
1, ordinate is b
1, the peak point horizontal ordinate of curve 2 is a
2, ordinate is b
2:
The data error ε of curve 1 and curve 2 end point
2> 5%; The end point horizontal ordinate of establishing curve 1 is c
1, ordinate is d
1, the end point horizontal ordinate of curve 2 is c
2, ordinate is d
2:
Therefore only need the axle to applying to draw load F
sadjust, return to step (three), re-start FEM (finite element) calculation.Until meet the data error of two peak of curve points, end point, be all less than or equal to 5%,, enter step (four).
Step (four), according to the definite additional bending moment test tool model of step (three), prepare additional bending moment test tool, carry out coupling between bending and extension equivalent test, obtain the ultimate bearing capacity parameter of coupling bolt, corresponding load F when coupling bolt is broken; By final definite F in load F and step (three)
scontrast, if F>=F
s, in step (), bolt connection piece meets design requirement, otherwise in step (), bolt connection piece does not meet design requirement.
F > F in the present embodiment
s, in determining step (), true bolt connection piece meets design requirement.
The above; only be the embodiment of the best of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
The content not being described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (4)
1. a bolt coupling between bending and extension equivalent test method, is characterized in that: comprise the steps:
Step (one), by finite element software, bolt connection piece is carried out to simulation analysis, obtain coupling bolt sectional axis and draw data and coupling bolt cross section moment of flexure data, and take coupling bolt sectional axis and draw as horizontal ordinate, coupling bolt cross section moment of flexure is ordinate, curve plotting 1;
The physical dimension of step (two), the upper bolt box according in described bolt connection piece, lower bolt box and coupling bolt, utilize finite element software to set up additional bending moment test tool model, described additional bending moment test tool model comprises bolt box (1), lower bolt box (2), cushion block (3) and bolt (4), wherein going up bolt box (1) is connected by bolt (4) with lower bolt box (2), cushion block (3) is positioned between bolt box (1) and lower bolt box (2), and is positioned at a side of bolt (4);
Step (three), utilize finite element software to calculate described additional bending moment test tool model to draw load F applying axle
sunder coupling bolt sectional axis draw data and coupling bolt cross section moment of flexure data, and take coupling bolt sectional axis and draw as horizontal ordinate, coupling bolt cross section moment of flexure is ordinate, curve plotting 2,, the curve 1 obtaining in curve 2 and step () is contrasted,
If two the data error of peak of curve point, end point all≤5%, enters step (four); If two the data error > 5% of peak of curve point data error≤5%, end point, draws load F to the axle applying
sadjust, return to step (three); If data error≤5% of peak of curve point data error > 5%, end point two, utilize finite element software to modify to the size of the upper bolt box (1) of described additional bending moment test tool model, lower bolt box (2) and cushion block (3), return to step (three); If two the equal > 5% of the data error of peak of curve point, end point, draws load F to the axle applying
sadjust, utilize finite element software to modify to the physical dimension of the upper bolt box (1) of described additional bending moment test tool model, lower bolt box (2) and cushion block (3) simultaneously, return to step (three);
Step (four), according to the definite additional bending moment test tool model of step (three), prepare additional bending moment test tool, carry out coupling between bending and extension equivalent test, obtain the ultimate bearing capacity parameter of coupling bolt, corresponding load F when coupling bolt is broken; Final definite axle in load F and step (three) is drawn to load F
scontrast, if F>=F
s, in step (), bolt connection piece meets design requirement, otherwise in step (), bolt connection piece does not meet design requirement.
2. a kind of bolt coupling between bending and extension equivalent test method according to claim 1, it is characterized in that: the upper bolt box (1) in the additional bending moment test tool model of setting up in described step (two) comprises base plate, backboard and two side plates, lower bolt box (2) comprises top board, backboard and two side plates, cushion block (3) is cube structure, and bolt (4) is avoided in cushion block (3) installation site.
3. a kind of bolt coupling between bending and extension equivalent test method according to claim 1 and 2, is characterized in that: the base plate thickness of upper bolt box (1) in the additional bending moment test tool model of setting up in described step (two) is, the summation of the top plate thickness of lower bolt box (2) and cushion block (3) thickness equals upper bolt box base plate thickness and the lower bolt box top plate thickness sum in bolt connection piece in step ().
4. a kind of bolt coupling between bending and extension equivalent test method according to claim 1, it is characterized in that: the upper bolt box (1) to additional bending moment test tool model in described step (three), the size of lower bolt box (2) and cushion block (3) is modified, the i.e. base plate to upper bolt box (1), side plate thickness, the top board of lower bolt box (2), side plate thickness and cushion block (3) thickness is adjusted, need to meet the base plate thickness of the upper bolt box (1) in additional bending moment test tool model simultaneously, the summation of the top plate thickness of lower bolt box (2) and cushion block (3) thickness equals upper bolt box base plate thickness and the lower bolt box top plate thickness sum in bolt connection piece in step ().
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410286019.7A CN104090998B (en) | 2014-06-24 | 2014-06-24 | A kind of bolt coupling between bending and extension equivalent test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410286019.7A CN104090998B (en) | 2014-06-24 | 2014-06-24 | A kind of bolt coupling between bending and extension equivalent test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104090998A true CN104090998A (en) | 2014-10-08 |
| CN104090998B CN104090998B (en) | 2017-04-05 |
Family
ID=51638714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410286019.7A Active CN104090998B (en) | 2014-06-24 | 2014-06-24 | A kind of bolt coupling between bending and extension equivalent test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104090998B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012069073A (en) * | 2010-09-27 | 2012-04-05 | Honda Motor Co Ltd | Structure analysis method for screw fastening part |
| CN103091122A (en) * | 2013-01-08 | 2013-05-08 | 北京工业大学 | Diagnostic method of space gridding structure node bolt loosening injury |
-
2014
- 2014-06-24 CN CN201410286019.7A patent/CN104090998B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012069073A (en) * | 2010-09-27 | 2012-04-05 | Honda Motor Co Ltd | Structure analysis method for screw fastening part |
| 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 |
|---|
| 侯传涛等: "典型爆炸螺栓承载能力研究", 《强度与环境》 * |
| 张朝晖等: "火箭级间段连接螺栓失效数值模拟", 《强度与环境》 * |
| 栾宇等: "小变形下螺栓法兰连接结构的静刚度非线性特性", 《强度与环境》 * |
| 王斌等: "基于结构优化技术的等效刚度试验边界设计方法", 《北京力学会第19届学术年会论文集》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104090998B (en) | 2017-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108709534B (en) | Shield tunnel structure stress deformation indoor model test device and installation method thereof | |
| CN103105303B (en) | End wall loading device for vehicle body strength test stand and method thereof | |
| Cluni et al. | Wind action on regular and irregular tall buildings: Higher order moment statistical analysis by HFFB and SMPSS measurements | |
| CN104865123A (en) | Strength and rigidity testing fixture for aircraft draw bar and use method of strength and rigidity testing fixture | |
| CN103063401B (en) | Preparation method of steel truss arch bridge wind tunnel test model | |
| CN106777549B (en) | Bridge multi-scale finite element simulation method for load test | |
| CN104062181A (en) | Test device for acquiring normal contact rigidity of joint surface, and modeling method | |
| CN104156498A (en) | Finite element method and strength evaluation method for bolt | |
| CN109050970B (en) | A kind of ground experiment method under simulation aircraft components dangerous position is loaded in the sky | |
| CN109573098B (en) | Full-size fatigue test high vertical tail load loading design method | |
| CN108106952B (en) | Method for measuring impact load of beam with double symmetrical sections | |
| CN103604543B (en) | Three-dimensional general force measuring platform for satellite force limit vibration test | |
| CN106289844A (en) | The assay device of tunnel bottom structure accumulated damage under a kind of cyclic load | |
| CN105302994A (en) | Finite element simulation method of beam_plate shell structure | |
| CN103808575A (en) | Residual stress testing method | |
| CN109726435B (en) | Method for calculating load of joint nail group | |
| CN107063901A (en) | The acquisition methods of Fatigue Strength of Concrete curve under a kind of curved scissors stress | |
| CN103324805A (en) | Calculation method for checking ultimate strength of fan underframe | |
| CN110083886A (en) | A kind of helicopter vibration load simulating analysis based on finite element | |
| CN203965246U (en) | A kind of proving installation that obtains faying face normal contact stiffness | |
| CN202783799U (en) | Combined spar and leading edge loading device | |
| CN207066755U (en) | The experimental rig of tunnel bottom structure accumulated damage under a kind of cyclic load | |
| CN104090998A (en) | Equivalent test method for bolt stretching-bending coupling | |
| CN108387350A (en) | Vehicle body attachment point dynamic stiffness test method, device and storage medium | |
| CN103926085B (en) | A kind of H type crossbeam frame flex reverses mechanic property test method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |