CN109283041A - An experimental device and experimental method for measuring ultimate contact stress of connected parts in bolted joints - Google Patents
An experimental device and experimental method for measuring ultimate contact stress of connected parts in bolted joints Download PDFInfo
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- CN109283041A CN109283041A CN201811180586.9A CN201811180586A CN109283041A CN 109283041 A CN109283041 A CN 109283041A CN 201811180586 A CN201811180586 A CN 201811180586A CN 109283041 A CN109283041 A CN 109283041A
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- 238000002474 experimental method Methods 0.000 title claims abstract description 54
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
一种测量螺栓节点中被连接件极限接触应力的实验装置及实验方法，属于螺栓短期松弛测试领域。该实验装置包括用于加载力的拉伸机及内部放置千分表、磁力底座、试件、压力传感器和光杆螺栓的夹具，拉伸机配合压力传感器、千分表精确测量实验过程中力和位移的变化。该实验方法将螺栓的加载方式分为连续加载和非连续加载两种方式，对螺栓进行加载的过程中，通过千分表测出螺栓位移，通过压力传感器测出材料所承受的压力，再通过计算得出试件的应力—应变曲线，从曲线分析得出材料的极限接触应力。本发明结构简单、使用费方便，实验数据处理方便、测量精度高，应用范围广。
An experimental device and an experimental method for measuring the ultimate contact stress of connected parts in a bolt node belong to the field of short-term relaxation testing of bolts. The experimental device includes a tensile machine for loading force and a fixture for placing a dial indicator, a magnetic base, a test piece, a pressure sensor and a polished rod bolt. The tensile machine is matched with a pressure sensor and a dial indicator to accurately measure the force and change in displacement. This experimental method divides the loading methods of bolts into two modes: continuous loading and discontinuous loading. During the loading process of the bolts, the displacement of the bolts is measured by a dial indicator, the pressure on the material is measured by a pressure sensor, and then the The stress-strain curve of the specimen is calculated, and the ultimate contact stress of the material is obtained from the curve analysis. The invention has the advantages of simple structure, convenient use fee, convenient experimental data processing, high measurement accuracy and wide application range.
Description
Technical field
It relaxes in short term testing field the invention belongs to bolt, is related to the connected piece limit in a kind of measurement bolt joint and contacts
Stress test device and experimental method, for measuring limit contact stress of the material when being bolted.
Background technique
Being bolted has the characteristics that convenient disassembly, manufacturing standard, bearing capacity are big, is widely used in being linked and packed.
In fields such as automobile, steamer, aircrafts, being bolted stability is an Important Problems, and bolt pretightening is quality of connection again
Important parameter is intended to bolted pretightning force control in most reasonable size, promotes whole assembling quality, improve and use the longevity
Life, but bolt connection node is a complicated problem, and the pretightning force that control bolt is tightened is a difficult point again.
Influence bolt tighten precision factor be broadly divided into three aspect: input torque be converted into effective pretightning force precision,
Elastic interaction, short-term relaxation effect.In terms of the first two, assembly now has used rotation angle to tighten method, hydraulic drawing
Stretching method, more bolts, device for screwing up etc. improves tightening technique simultaneously, but in terms of short-term relaxation, even without in-depth study.
There are many kinds of the influence factors of short-term relaxation, and in addition to material self attributes, the bolt pretightening of load is not
Together, it can assign material internal different activation energy, so that different degrees of plastic deformation occurs for material, finally after completing load
Cause short-term relaxation effect occurrence degree different.But the generation of short-term relaxation, it should not be more than material pole because of its pretightning force
It limits contact strength and bright relaxation aobvious in short term occurs.The experiment side of measurement material limit contact stress in bolt joint at present
Method is not yet clearly stipulate that also without specific measurement means and decision procedure.In this regard, designing material pole in a kind of bolt joint
The experimental provision and experimental method for limiting contact stress are of great significance, and also tighten precision techniques to raising bolt and provide guidance.
Summary of the invention
The present invention aiming at the problem that be material in bolt joint limit contact stress: in bolt connection node, due to
It is more than Materials Yield Limit that the variation of extraneous factor or initial loading, which cause pretightning force, and material is plastically deformed, is contacting
Surface is recessed.If power is more than the limit contact strength of material, it may occur that apparent short-term relaxation causes connection pre-
Clamp force sharp fall, bonding strength are not able to satisfy given requirements.In view of the above-mentioned problems, the present invention provides a kind of measurement bolt section
The experimental provision and experimental method of connected piece limit contact stress in point.
The technical solution adopted by the present invention are as follows:
The experimental provision of connected piece limit contact stress in a kind of measurement bolt joint, including stretching-machine 3, fixture 7, thousand
Divide table 8, magnetic base 9, test specimen 10, pressure sensor 11, polished rod bolt 12.Power is carried out to experimental provision by stretching-machine 3
Load, stretching-machine 3 can only provide roughly power and displacement data, not be able to satisfy experimental precision requirement, need to cooperate and passed using pressure
The variation of power and displacement in sensor 11,8 precise measurement experimentation of amesdial.
The fixture 7 is cylinder-like structure, including upper and lower surface and fixture side wall 16, and upper surface is equipped on fixture and presss from both sides
First 13, lower surface center is provided with fixture bottom outlet 15, and fixture side wall 16 is equipped with an opening, and opening lower section is equipped with for placing magnetic force bottom
The magnetic base platform 14 of seat 9.The stretching-machine 3 is equipped with stretching-machine chuck 4, thereon grips fixture upper grip 13,
The screw portion of lower grips polished rod bolt 12.
Amesdial 8, magnetic base 9, test specimen 10, pressure sensor 11, polished rod bolt 12 are placed inside the fixture 7.
The amesdial 8 is fixed on the collet of magnetic base 9, and magnetic base 9 is placed on magnetic base platform 14, adjusts magnetic force
Pedestal 9 is against 8 probe of amesdial vertically on the nut of polished rod bolt 12, i.e. 8 axis of amesdial and 12 axis weight of polished rod bolt
It closes.The pressure sensor 11 is placed on 7 lower surface of fixture, and test specimen 10 is set to 11 top of pressure sensor, pressure sensing
Through-hole sensor bolt hole 18, test specimen bolt hole 17 are opened up on device 11 and test specimen 10, clear size of opening is less than the spiral shell of polished rod bolt 12
Cap size.The nut upper surface of the polished rod bolt 12 is contacted with the probe of amesdial 8, the screw portion of polished rod bolt 12 according to
Secondary stretching fixture bottom outlet 15 after passing through test specimen 10,11 through-hole of pressure sensor, and axis is kept to be overlapped, stretch out 7 lower surface of fixture
Length is 20~30mm.
The amesdial 8 is connect by data line 2 with computer 1, for measuring polished rod bolt 12 in experimentation
Change in displacement acquires depth of cup variation of the test specimen 10 by pressure.The pressure sensor 11 passes through data line 2
It is connect with computer 1, pressure size suffered by test specimen 10 is acquired in experimentation.The stretching-machine 3 is by data line 2 and draws
Machine controller 6, the connection of computer 1 are stretched, stretches the crossbeam space that machine controller 6 is used to adjust stretching-machine 3, computer 1 is for drawing
Stretch the experimental arrangement control of machine 3.
The experimental method of connected piece limit contact stress in a kind of measurement bolt joint, the experimental method by bolt plus
Load mode is divided into continuous load and discontinuous load: continuous load is to apply the increased pulling force of consistent to screw rod, and experiment needs
It to handle experimental curve diagram is obtained；Discontinuous load is that bolt is loaded into yield strength, then carries out hierarchical loading,
Experiment will consider the generation of creep.The experimental method specifically includes the following steps:
Step 1: assembling experimental provision
1.1) pressure sensor 11, test specimen 10 are put into fixture 7, the screw rod of polished rod bolt 12 sequentially passes through pressure sensing
Device 11,10 through-hole of test specimen stretch out 20~30mm, polished rod bolt 12, pressure sensor 11, test specimen 10 and fixture from fixture bottom outlet 15
15 4 axis of bottom outlet is overlapped；Magnetic base 9 is fixed on magnetic base platform 14, amesdial 8 is fixed on magnetic base 9
Above collet, by adjusting magnetic base 9, the probe of amesdial 8 is made vertically to be against the nut upper surface of polished rod bolt 12.
1.2) the distance between the collet up and down for adjusting stretching-machine chuck 4, is fixed on stretching for fixture and other experimental pieces 5
On machine 3.
1.3) stretching-machine 3, amesdial 8 and pressure sensor 11 are connect by data line 2 with computer 1, opens and calculates
The control software of machine 1.
Step 2: experimental provision uses preceding debugging
2.1) lower beam of stretching-machine 3, the lower collet and polished rod spiral shell of stretching-machine chuck 4 are finely tuned by stretching machine controller 6
The screw rod completion of bolt 12 is loaded, and the nut of polished rod bolt 12 is made to push down test specimen 10, forms small pulling force.
2.2) nut for being compressed polished rod bolt 12 using amesdial 8 by adjusting magnetic base 9 is formed 1mm~1.5mm and shown
Number, then carries out resetting zero for amesdial 8, pressure sensor 11.The screw rod of polished rod bolt 12 in test can be to by pulling force
Lower generation displacement generates impression in 10 upper surface of test specimen, and amesdial 8 constantly reads impression and changes over time feelings during test
Condition.
Step 3: carrying out continuous loading experiment
It controls stretching-machine 3 using computer 1 at the uniform velocity to load screw rod, amesdial 8 reads test specimen 10 in experimentation
Impression delta data, pressure sensor 11 read 10 pressure delta data of test specimen.When amesdial 8 reading reach 400 μm~
At 420 μm, continuous loading experiment terminates, and records whole process data, is fitted to stress-displacement curve.Experiment terminates more every time
Test specimen 10 and polished rod bolt 12 are changed, repeats continuous loading experiment 5 times.
Step 4: carrying out discontinuous loading experiment
Experimental provision is adjusted to the state of step 2, discontinuous load is step-loaded, and step-loaded is opened from yield limit
Begin, carries out step-loaded by ladder of 5kn or 10kn；
Start stretching-machine 3, control computer 1, be first loaded into the yield stress position of test specimen 10, then carries out ladder and add
It carries, load 120s is kept after the completion of each step-loaded, until the accumulative depth of cup of load reaches 100 μm or is keeping carrying
2 μm of creeps occur during lotus, stops experimental record experimentation and is fitted stress-inflection curves.Experiment terminates replacement test specimen every time
10 and polished rod bolt 12, repeat discontinuous loading experiment 5 times.
Step 5: removing experimental provision, arrange experimental data, compare the experimental result of two kinds of loading methods generation, analyze material
The mechanical property of material obtains the creep situation of the material, obtains limit contact stress of the material when being bolted.Material
Limit contact stress be the test specimen in practical set and use maximum load capacity, the contact stress that oversteps the extreme limit will lead to bright
Short-term relaxation is shown to generate.
In experimentation, what pressure sensor 11 measured is the size of power, needs to be converted to stress:
In formula, P indicates stress intensity suffered by test specimen 10；F indicates the size of 10 stress of test specimen, SEffectivelyIndicate bolt joint
Effective contact area；D1Indicate the effective contact surface diameter of nut of polished rod bolt 12, D2Indicate 10 through-hole diameter of test specimen.
Compared with prior art, the invention has the benefit that
(1) the Preparatory work of experiment stage is simple: it is workpiece, Er Qieguang that the device, which only has fixture 7, polished rod bolt 12, test specimen 10,
Bar bolt 12 can be obtained by handling existing standard bolt, remaining is Purchased Item.The structure of fixture 7 and test specimen 10 is simple,
The processing is simple.
(2) experiment measurement accuracy is high: the precision of amesdial 8 is 1 μm, and sensor dynamometry is accurate, obtained experimental data processing
As a result more convincing.
(3) Data Processing in Experiment is convenient: the data for testing acquisition are all made of software processing, and it is convenient to save, and do not remember manually
Record, frequency acquisition is high, and experimental data accuracy is high.
(4) applied widely: this experimental provision can also carry out the surrender of material in addition to that can carry out relaxation experiment for a long time
Experiment, breaks experiment at the experiment of limit contact strength, has a wide range of application.
Detailed description of the invention
Fig. 1 is general assembly X-Y scheme before experiment starts；
Fig. 2 is fixture and other 5 two dimensional model figures of experimental piece；It (a) is main view；It (b) is side view；(c) from the bottom up
Top view；It (d) is axonometric drawing；
Fig. 3 is 7 two dimensional model figure of fixture；It (a) is main view；It (b) is side view；(c) top view；It (d) is axonometric drawing；
Fig. 4 is 10 three-dimensional model diagram of test specimen；
Fig. 5 is 11 three-dimensional model diagram of pressure sensor；
Fig. 6 is 14 two dimensional model figure of magnetic base；It (a) is main view；It (b) is side view；(c) top view；(d) it is regarded for axis
Figure.
Fig. 7 is 8 three-dimensional model diagram of amesdial；
Fig. 8 is 12 three-dimensional model diagram of polished rod bolt；
Fig. 9 is the stress-displacement curve of test specimen 10；
In figure: 1 computer, 2 data lines, 3 stretching-machines, 4 stretching-machine chucks, 5 fixtures and other experimental pieces, 6 stretching-machine controls
Device processed, 7 fixtures, 8 amesdials, 9 magnetic bases, 10 test specimens, 11 pressure sensors, 12 polished rod bolts, 13 fixture upper grips, 14 magnetic
Power base platform, 15 fixture bottom outlets, 16 fixture side walls, 17 test specimen bolts hole, 18 sensor bolt holes.
Specific embodiment
Below with reference to Fig. 1-8 and experimental method, more detailed description is done to the present invention.
The experimental provision of the measurement bolt joint middle or short term relaxation effect provided according to the present invention, as shown in Figure 1 and Figure 2, packet
Include stretching-machine 3, fixture 7, amesdial 8, magnetic base 9, test specimen 10, sensor 11, polished rod bolt 12.Test specimen 10 is used in experiment
Material category and its shape size it is all the same.
Non- Purchased Item design: fixture 7 must assure that intensity requirement, carry out heat treatment strengthen rigidity after processing is completed.Fixture 7
Design size is upper and lower end face with a thickness of 20mm, and 13 diameter 40mm width 40mm of fixture upper grip, outer diameter is 240mm high 260mm,
15 diameter of fixture bottom outlet is 40mm.Amesdial 8, test specimen 10, pressure sensor 11, polished rod bolt 12, magnetic are placed in space in fixture 7
For power base platform 14 for placing magnetic base 9, magnetic base 9 acts on the position of fixed amesdial 8；10 body of test specimen is necessary
The lower stress field (being greater than three times aperture) formed is acted on included in polished rod bolt 12, therefore 10 design size of test specimen is diameter 40mm
The cylindrical body of high 40mm, axis direction have 10.5mm test specimen bolt hole 17, bear in test the pressure that polished rod bolt 12 transmits；
Polished rod bolt 12 is treated standard component, and threaded portion is cut off to form polished rod, the intensity of polished rod bolt 12 is 10.9 grades,
Diameter is 10mm, the long 100mm of bar.
Purchased Item explanation: during the experiment, error is in 1 μ m, so the precision of amesdial 8 must be enough, uses
Five key amesdial of digital display.Amesdial 8 has dedicated data line 2, and experimental data is transmitted to computer 1 in experiment and is handled,
Accurately obtain the depth of cup change procedure of test specimen 10 in experimentation；The sensor bolt hole 18 of pressure sensor 11 is
10.5mm (identical as the diameter of test specimen bolt hole 17), outer diameter 45mm obtain test specimen 10 greater than the outer diameter of test specimen 10 in experiment
The pressure of receiving.Pressure sensor 11 show that data are handled through computer 1 in an experiment, and available test specimen 10 is in experimentation
Pressure change procedure.The selection of magnetic base 9 needs to consider the size of amesdial, excessive too small to make amesdial 7
Position adjustment becomes difficult.
Preparation stage: according to Fig. 1-8, armamentarium required in experiment is ready to.By polished rod bolt 2, examination
Part 10, pressure sensor 11 are connected in turn, and are then placed in fixture 7, then amesdial 8 is loaded on magnetic base 9, put
Onto the magnetic base platform 14 of fixture 7, position is adjusted, guarantees that 7 axis of amesdial is overlapped with 12 axis of polished rod screw rod, and make thousand
Divide the registration of table 8 at 400 μm~420 μm.Stretching-machine 3 and data line 2 are connected to computer 1, carry out online testing, debugging is drawn
The control software of machine 3 is stretched, style typing is carried out.Fixture 7 is loaded on by the position for checking and adjusting fixture and other experimental pieces 5
On stretching-machine 3.Amesdial 8 and pressure sensor 11 are connected to computer 1 by data line 2, its controllability is checked, debugs
The capture program of amesdial 7 and pressure sensor 11.Finally check whole assembly and connection.
Adjustment before experiment: starting stretching-machine 3 and computer 1 open corresponding control software, and manipulation stretches machine controller 6 and moves
The lower collet of stretching-machine chuck 4 is clamped polished rod screw rod 12, forms small pulling force by the crossbeam of dynamic stretching-machine 3.Reset amesdial 8
With pressure sensor 11, make its registration 0.
Carry out continuous loading experiment:
The described continuous load is to apply the increased pulling force of consistent to screw rod, until depth of cup is more than 400 μm, this
When the material footprint pressure that oversteps the extreme limit already destroyed, record whole process data, be fitted to stress-inflection curves, herein
It is read in curve and 20 μm, 100 μm, the corresponding footprint pressure of 200 μm of plastic indentation depth occurs.Specifically: starting pressure sensing
Device 11 and amesdial 8 acquire button, and starting computer 1 carries out stretching experiment, movement speed 0.050mm/min.The number of amesdial 8
According to being fitted to time-displacement curve, m- force curve when being fitted to of sensor 11.Continuous loading experiment carries out 5 times, tests every time
Replace polished rod bolt 12 and test specimen 10.By testing the stress-displacement curve for obtaining and continuously loading, done by slope of yielding stage
100 μm of corresponding contact stress of plastic deformation occur for translated linear, the intersection point, that is, material for translating 100 μm and curve.Continuous
The yield strength σ of test specimen 10 is obtained in experimentsAnd the stress of 20 μm, 100 μm, 200 μm depths of cup occurs.
Carry out discontinuous loading experiment:
The discontinuous load is that bolt is loaded into yield strength, then carries out hierarchical loading, every time plus 5kN or
10kN (depending on material property) load keeps 120s after increasing load every time, reaches 100 μm until adding up depth of cup,
Terminate if 2 μm of creeps occur during 120s is kept and are also considered as experiment, record experimentation is fitted stress-deformation line.Comparison
The experimental result that two kinds of loading methods generate, the mechanical property of analysis of material obtain the creep situation of the material, to determine its pole
Limit footprint pressure foundation.Specifically: starting pressure sensor 11 and amesdial 8 acquire button, and starting computer 1 is stretched,
Movement speed is 0.050mm/min, is loaded into yield strength σsStop, keep load 120s, then increase load 5kN (or
120s 10kN) is kept, load 5kN (or 10kN) is then further added by and keeps 120s, carries out this step-loaded until adding up impression
Depth, which reaches, occurs 2 μm of creeps in 100 μm or retention time, experiment stops.Discontinuous loading experiment 5 times, replaces spiral shell every time
Bolt and test specimen.
Processing experimental data: first according to real contact area (not considering microscopic contact), pressure sensor 11 is obtained
Force-time curve be converted into stress time curve.Displacement-time curve that amesdial is obtained and pressure force-displacement curve into
Row integration, obtains the stress-displacement curve of test specimen.As shown in figure 9, elasticity only occurs at the beginning and becomes in stress-displacement curve
Shape, stress is directly proportional to displacement, and slope is the elasticity modulus of material, and the performance of subsequent material is destroyed, is plastically deformed.
Embodiment described above only expresses embodiments of the present invention, and but it cannot be understood as to the invention patent
Range limitation, it is noted that for those skilled in the art, without departing from the inventive concept of the premise, also
Several modifications and improvements can be made, these are all belonged to the scope of protection of the present invention.
Claims (5)
1. the experimental provision of connected piece limit contact stress in a kind of measurement bolt joint, which is characterized in that the experiment
Device includes stretching-machine (3), fixture (7), amesdial (8), magnetic base (9), test specimen (10), pressure sensor (11), polished rod
Bolt (12)；
The fixture (7) is cylinder-like structure, including upper and lower surface and fixture side wall (16), and upper surface is equipped on fixture and presss from both sides
Head (13), lower surface center are provided with fixture bottom outlet (15), and fixture side wall (16) is equipped with an opening, and opening lower section is equipped with for placing
The magnetic base platform (14) of magnetic base (9)；The stretching-machine (3) is equipped with stretching-machine chuck (4), thereon grips
Fixture upper grip (13), the screw portion of lower grips polished rod bolt (12)；
Amesdial (8), magnetic base (9), test specimen (10), pressure sensor (11), polished rod spiral shell are placed inside the fixture (7)
Bolt (12)；The amesdial (8) is fixed on the collet of magnetic base (9), and magnetic base (9) is placed on magnetic base platform
(14) on, adjustment magnetic base (9) is against amesdial (8) probe vertically on the nut of polished rod bolt (12)；The pressure
Sensor (11) is placed on fixture (7) lower surface, and test specimen (10) is set to above pressure sensor (11), pressure sensor (11)
With open up through-hole on test specimen (10), clear size of opening is less than polished rod bolt (12 nut size；The spiral shell of the polished rod bolt (12)
Cap is contacted with amesdial (8) probe, and screw rod stretches out fixture bottom outlet after sequentially passing through test specimen (10), pressure sensor (11) through-hole
(15), and axis is kept to be overlapped；
The amesdial (8), pressure sensor (11) are connect with computer (1), and amesdial (8) is for measuring polished rod bolt
(12) change in displacement acquires the depth of cup variation of test specimen (10) by pressure, and pressure sensor (11) is for adopting
Collect pressure size suffered by test specimen (10)；The stretching-machine (3) is connect with stretching machine controller (6), computer (1), is stretched
Machine controller (6) is used to adjust the crossbeam space of stretching-machine (3).
2. the experimental provision of connected piece limit contact stress in a kind of measurement bolt joint according to claim 1,
It is characterized in that, the length that the screw portion of the polished rod bolt (1) stretches out fixture bottom outlet (15) is 20~30mm.
3. the experimental method of connected piece limit contact stress in a kind of measurement bolt joint, it is characterised in that following steps:
Step 1: assembling experimental provision
1.1) pressure sensor (11), test specimen (10) are put into fixture (7), the screw rod of polished rod bolt (12) sequentially passes through pressure
Sensor (11), test specimen (10) through-hole stretch out 20~30mm from fixture bottom outlet (15), and four axis are overlapped；By amesdial (8)
It is fixed on above the collet of magnetic base (9), so that the probe of amesdial (8) is vertically against polished rod by adjusting magnetic base (9)
The nut upper surface of bolt (12)；
1.2) the distance between the collet up and down for adjusting stretching-machine chuck (4), is fixed on stretching for fixture and other experimental pieces (5)
On machine (3)；
1.3) stretching-machine (3), amesdial (8) and pressure sensor (11) are connect with computer (1)；
Step 2: experimental provision uses preceding debugging
2.1) stretching-machine (3) lower beam, the lower collet and polished rod spiral shell of stretching-machine chuck (4) are finely tuned by stretching machine controller (6)
The screw rod completion of bolt (12) is loaded, and the nut of polished rod bolt (12) is made to push down test specimen (10)；
2.2) nut for compressing polished rod bolt (12) using amesdial (8) by adjusting magnetic base (9), forms 1mm~1.5mm
Registration, then by amesdial (8), pressure sensor (11) resetting zero；
Step 3: carrying out continuous loading experiment
Screw rod is at the uniform velocity loaded using computer (1) control stretching-machine (3), amesdial (8) reads test specimen in experimentation
(10) impression delta data, pressure sensor (11) read test specimen (10) pressure delta data；When amesdial (8), reading reaches
When to 400 μm~420 μm, stop experiment, records whole process data, be fitted to stress-displacement curve；
Step 4: carrying out discontinuous loading experiment
Experimental provision is adjusted to the state of step 2, is started after stretching-machine (3) be loaded into the yield stress position of test specimen (10),
Carry out step-loaded, load 120s kept after the completion of each step-loaded, until load accumulative depth of cup reach 100 μm or
Person is keeping duration of load that 2 μm of creeps occur, and stops experiment, and record experimentation is fitted stress-inflection curves；
Step 5: the experimental result that two kinds of loading methods of comparison generate, the mechanical property of analysis of material obtain material and connect in bolt
Limit contact stress in the case of connecing.
4. experimental method according to claim 3, which is characterized in that during the discontinuous loading experiment, with 5kn
Or 10kn is that ladder carries out step-loaded.
5. experimental method according to claim 3 or 4, which is characterized in that continuous loading experiment, discontinuous load are real every time
After testing, test specimen (10) and polished rod bolt (12) are replaced, is repeated loading experiment 5 times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811180586.9A CN109283041B (en) | 2018-10-09 | 2018-10-09 | Experimental device and experimental method for measuring ultimate contact stress of connected piece in bolt node |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811180586.9A CN109283041B (en) | 2018-10-09 | 2018-10-09 | Experimental device and experimental method for measuring ultimate contact stress of connected piece in bolt node |
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| CN109283041B CN109283041B (en) | 2020-05-19 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113970435A (en) * | 2021-11-02 | 2022-01-25 | 洛阳理工学院 | An axially stressed pre-tightening bolt connection strength test bench and its test method |
| CN115014932A (en) * | 2022-06-14 | 2022-09-06 | 大连理工大学 | Experimental device and experimental method for measuring ultimate contact stress of pipeline connecting piece |
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| CN113203512B (en) * | 2021-03-16 | 2022-11-29 | 青海大学 | Method for monitoring attachment point |
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| CN115014932A (en) * | 2022-06-14 | 2022-09-06 | 大连理工大学 | Experimental device and experimental method for measuring ultimate contact stress of pipeline connecting piece |
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