CN106840922A - A kind of method of tubing forming property under test complex strain paths - Google Patents
A kind of method of tubing forming property under test complex strain paths Download PDFInfo
- Publication number
- CN106840922A CN106840922A CN201611235602.0A CN201611235602A CN106840922A CN 106840922 A CN106840922 A CN 106840922A CN 201611235602 A CN201611235602 A CN 201611235602A CN 106840922 A CN106840922 A CN 106840922A
- Authority
- CN
- China
- Prior art keywords
- tubular product
- product sample
- bulging
- strain
- sealing
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000007789 sealing Methods 0.000 claims abstract description 72
- 238000002474 experimental method Methods 0.000 claims abstract description 26
- 238000007405 data analysis Methods 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 31
- 238000004458 analytical method Methods 0.000 claims description 28
- 230000008859 change Effects 0.000 claims description 22
- 239000011888 foil Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 19
- 238000013461 design Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000010998 test method Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 118
- 238000003466 welding Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 11
- 238000007493 shaping process Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- 238000012938 design process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000009172 bursting Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
- G01N3/28—Investigating ductility, e.g. suitability of sheet metal for deep-drawing or spinning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- 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
- G01N3/06—Special adaptations of indicating or recording means
-
- 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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of method of tubing forming property under test complex strain paths, it is related to a kind of method of testing of forming tubular product performance, with the free bulge experimental technique for solving the method for testing of traditional fixed stress state lower linear load path and occur recently tubing cannot all deformed according to complex strain paths, the problem of tubing forming property under complex strain paths cannot be thus obtained, method is realized according to following steps：Step one, Mold Making：The tube bulge mould changed with specific bulging confining region shape and draw ratio is designed and processed according to actual needs；It is prepared by step 2, sample；Step 3, installation are fixed：Step 4, tubing sealing；Step 5, bulging test；Step 6, data analysis.The present invention is for tubing forming property test under complex strain paths.
Description
Technical field
The present invention relates to a kind of method of testing of forming tubular product performance, and in particular to one kind test complex strain paths down tube
The method of material forming property.
Background technology
In Aero-Space and auto industry, to mitigate construction weight, improving structural reliability, in the urgent need to using whole
Body component replaces traditional component by multiple simple assembling parts weldings.Hollow closed cross-section part is the weight in integrated member
A class is wanted, it is mainly fabricated by using original relatively simple thin wall cylinder base or pipe.It is configured to from simple blank final multiple
Miscellaneous part, blank will experience complicated deformation process.The stress and stress state in some region will be whole on blank
It is continually changing in deformation process.
It is well known that when material deforms under different stresses and stress state, different formabilities can be shown
Energy.For example, material simple tension to be broken when limit elongation and bulging to rupture when direction ultimate elongation meeting
There is significant difference.In order to describe forming property or ultimate deformation ability of the material under different stress, phase need to be generally used
The experimental technique answered make material deformed under certain specified conditions until destruction so that obtain it is this under the conditions of the limit
Strain.By changing material deformation condition and being tested accordingly, the limiting strain under the conditions of different distortion can be obtained, utilized
These limiting strains can determine usually said forming limit diagram (forming limit diagram).It is pointed out that
Each data point in traditional forming limit diagram, a certain fixed deformation condition of correspondence or linear loading path.It is this to adopt
The forming limit diagram determined with fixed deformation condition or linear loading path has been widely used for characterizing and evaluating the shaping of material
Performance.But, this forming limit diagram is only used for representing the forming property under preferable or fixed deformation condition.If from
The deformation condition or load path of initial material when final destruction of deformation constantly change, then this traditional shaping pole
Limit figure will no longer be applicable.
Recently, occur in that using the experiment of tubing free bulge to simulate real tube bulge forming process, and using certainly
Limiting strain when finally being ruptured by bulging is come the method that characterizes pipes shaping limit.Tubing is in axial direction and ring during free bulge
All by deforming under conditions of pulling force, and in deformation process tubing axial stress and circumference stress ratio (i.e. stress
State) it is continually changing, this change is similar with actual tube bulge forming process, therefore the pole that profit determines in this way
Limit strain can be instructed preferably actual expansion forming, and particularly can the forming property for judgement material meet zero
The need for part shapes.At present, free bulge experiment is directly tested and evaluation forming tubular product performance particularly bulging as a kind of
The experimental technique of energy, has been obtained for being widely recognized as and practical application.(tubing is straight for bulging limit coefficient after tube bulge rupture
The maximum variable quantity in footpath and the ratio of initial diameter), limiting strain when bursting pressure, bursting is often used as evaluating forming tubular product
The index of performance.However, during existing tubing free bulge, the pipe length in middle bulging area is held essentially constant, should
Although the stress state of region material can also occur a certain degree of change, this change is completely by middle bulging area tubing
Length determine.Therefore, tested by the free bulge of this fixed bulging section length, can only obtain some simple changes or certain
Forming property under a little specific stress paths, can not obtain the forming limit under more generally complicated stress environment, also
The shaping of above-mentioned complicated integrated member cannot be provided and accurately and effectively instructed.In order to the accurate tubing that obtains is in complexity shaping bar
Forming property under part is, it is necessary to a kind of can make tubing in the experiment side for more typically and under controllable complex strain paths deforming
Method.
The content of the invention
The present invention is the method for testing and appearance recently to solve traditional fixed stress state lower linear load path
Free bulge experimental technique tubing cannot all deformed according to complex strain paths, thus complex loading road cannot be obtained
The problem of tubing forming property under footpath, and then the method for proposing tubing forming property under a kind of test complex strain paths.
The present invention is adopted the technical scheme that to solve the above problems：
Scheme one：The method of tubing forming property is realized according to following steps under a kind of test complex strain paths：
Step one, Mold Making：Design according to actual needs and process with specific bulging confining region shape and major diameter
Than the tube bulge mould for changing；
It is prepared by step 2, sample：Need to intercept certain length tubular product sample according to experiment, and by tubular product sample surface clean
Totally；
Step 3, installation are fixed：Expanding die is fixed on a test platform, the position of tubular product sample is adjusted, and
Foil gauge is pasted in the middle of the tubular product sample outer surface at bulging area point M, connection foil gauge and deformeter are with answering measurement point M at
Become, the tubular product sample for pasting strain is fitted into the expanding die；
Step 4, tubing sealing：Tubular product sample two ends to be measured are sealed using corresponding sealing means, high-voltage power supply is by high pressure
Fluid media (medium) is filled with inside tubular product sample by one end of the tubular product sample after sealing, and the probe of pressure sensor is inserted into sealing
The other end of tubular product sample afterwards, the high-voltage power supply, the deformeter and the pressure sensor are all connected with analysis of test system；
Step 5, bulging test：To high-pressure fluid medium is gradually filled with the tubular product sample of step 4, tubular product sample is swollen
There is bulging under the collective effect of shape internal pressure P and expanding die until rupture, the change of the bulging internal pressure P in record Bulging Process
Change, axial strain and hoop strain at bulging area peak M；
Step 6, data analysis：Processing above-mentioned experimental data by analysis of test system can obtain tubular product sample at this
Pressure and limiting strain forming property parameter are burst under one load path.
Scheme two：The method of tubing forming property is realized according to following steps under a kind of test complex strain paths：
Step one, Mold Making：Design according to actual needs and process with specific bulging confining region shape and major diameter
Than the tube bulge mould for changing；
It is prepared by step 2, sample：Need to intercept certain length tubular product sample according to experiment, and by tubular product sample surface clean
Totally；
Step 3, installation are fixed：Expanding die is fixed on a test platform, the position of tubular product sample is adjusted, and
The speckle of a floor random distribution is sprayed in the middle of the tubular product sample outer surface around bulging area point M, the tubular product sample of speckle will be sprayed with
It is fitted into the expanding die, and makes point M just to CCD camera, Strain Analysis System is connected with the CCD camera；
Step 4, tubing sealing：Tubular product sample two ends to be measured are sealed using corresponding sealing means, high-voltage power supply is by high pressure
Fluid media (medium) is filled with inside tubular product sample by one end of the tubular product sample after sealing, and the probe of pressure sensor is inserted into sealing
The other end of tubular product sample afterwards, the high-voltage power supply, Strain Analysis System and the pressure sensor are all connected with analysis test system
System；
Step 5, bulging test：To being gradually filled with high-pressure fluid medium in the tubular product sample of step 4, including tubular product sample
There is bulging under the collective effect of pressure P and expanding die until rupture, bulging pressure P changing values, bulging in record Bulging Process
Axial strain and hoop strain at area peak M；
Step 6, data analysis：Processing above-mentioned experimental data by analysis of test system can obtain tubular product sample at this
Pressure and limiting strain forming property parameter are burst under one load path.
The invention has the advantages that：
(1) present invention can realize the bulging experiment of tubing under complex strain paths, and obtain tubing on complex loading road
Forming property under footpath, solves traditional forming limit diagram and is only applicable to describe material property under linear loading path
Problem；
(2) present invention uses the forming property of tube bulge experiment test material, with actual tube bulge forming process class
Seemingly, preferably actual expansion forming can be instructed；
(3) by the draw ratio change in the shape control tubing Bulging Process of expanding die, realization sets the present invention in advance
Fixed complex strain paths, solve the shaping that the experiment of tubing free bulge can only be obtained under the load path of some simple changes
The problem of performance；
(4) present invention carries out tube bulge test using a series of expanding dies of different shapes, obtains a series of differences
Pipe performance under complex strain paths, so that more fully reflect the actual forming property of tubing under differing formed technique,
It is easy to determine rational forming technology；
(5) present invention can realize that the forming property of tubing under condition of different temperatures is swollen by selecting suitable fluid media (medium)
Shape is tested.Wherein liquid medium is tested suitable for normal temperature forming property, and gas medium is applied to hot forming performance test；
(6) present invention is less demanding to experimental provision, it is not necessary to complicated biaxial stress closed-loop control system and gear
Tool device, bulging experimental implementation is simply easily achieved.
Brief description of the drawings
Fig. 1 is scheme one makees the swollen of tubing forming property under strain measurement method test complex strain paths using foil gauge
Shape tests schematic diagram, and Fig. 2 is scheme two using tubing formability under non-contact type strain measurement method test complex strain paths
The bulging experiment schematic diagram of energy, tubular product sample and expanding die arrangement schematic diagram when Fig. 3 is non-bulging, Fig. 4 is using cone
Tubular product sample and expanding die arrangement schematic diagram in shape drift sealing Bulging Process, Fig. 5 is tubular product sample in Bulging Process
With general curve bulging confining region structural representation, Fig. 6 is using tubular product sample and bulging in welding end socket sealing Bulging Process
Mould arrangement schematic diagram, Fig. 7 is using tubular product sample and expanding die in sealing plug and sealing ring sealing Bulging Process
Arrangement schematic diagram.
Wherein, 1 be tapered punch, 2 be expanding die, 3 be tubular product sample, 4 be foil gauge, 5 be deformeter, 6 be pressure
Sensor, 7 be analysis of test system, 8 be high-voltage power supply, 9 be CCD camera, 10 be Strain Analysis System, 11 for welding end socket, 12
For sealing plug, 13 are sealing ring.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.
The general principle of foundation of the present invention is：Research has shown that its middle bulging zone position is at certain during tubing free bulge
The stress state at moment, the pipe length for being mainly in complete free state by the moment is determined.By the pipe in free state
Base length is defined as draw ratio with the ratio of restrained end pipe diameter, then the change of draw ratio will directly affect middle bulging area
Stress state.If the draw ratio of bulging area pipe is adjusted or is controlled in Bulging Process, tubing can be changed swollen
Stress state during shape.The present invention is based on this principle and proposes, i.e., by control or adjustment tube bulge during
Draw ratio realizes complex strain paths set in advance.This is just the shaping pole of tubing under the general complex strain paths of test
Limit is provided may.
The expanding die structure used in the present invention is as shown in Figure 3.According to the difference of effect, expanding die can be divided into
Tubing fixed area and bulging confining region.Wherein, the internal diameter d of tubing fixed area is than tubular product sample outer diameter D0Bigger or d=D0, its work
With being to fix tubular product sample.Bulging confining region flare, its effect is outer surface profile when constraining tubular product sample bulging.It is swollen
When shape is tested, there is bulging in tubular product sample, tubular product sample outer surface gradually reclines under the collective effect of internal pressure P and expanding die
No longer there is bulging by mould constraint in the bulging confining region of mould, the tubing of abutting section.With the increase of bulging degree, pipe
Material bulging area draw ratio is gradually reduced, draw ratio λ as shown in Figure 41=l1/D1Less than the draw ratio λ shown in Fig. 30=l0/
D0.As shown in figure 5, the profile of the axial opening angle θ differences of the bulging confining region of expanding die 2 or bulging confining region is bent
Line is different, and the change procedure of tube bulge area draw ratio is also different.Therefore, bulging confining region is designed into different shapes can be with
Obtain different draw ratio change procedures.During design expanding die shape, load path is determined according to actual needs, then basis
Draw ratio determines the change procedure of draw ratio with the relation of stress state and load path, finally arrives the change reflection of draw ratio
On expanding die.In the expanding die with given shape during bulging, tubular product sample will add according to the complexity being pre-designed
There is bulging under path in load.Therefore, formability of the tubing under specific complex strain paths can accurately be obtained using the present invention
Energy.If a series of expanding dies of design processing simultaneously carry out multiple bulging experiment test, a series of load paths can be completed
The test of lower pipe performance, so that the forming property of more comprehensive and accurate evaluation tubing.
Illustrated with reference to Fig. 1, in one embodiment, the method for tubing forming property is under a kind of test complex strain paths
Realized according to following steps：
Step one, Mold Making：Design according to actual needs and process with specific bulging confining region shape and major diameter
Than the tube bulge mould 2 for changing；
It is prepared by step 2, sample：Interception certain length tubular product sample 3 is needed according to experiment, and the surface of tubular product sample 3 is clear
Wash clean；
Step 3, installation are fixed：Expanding die 2 is fixed on a test platform, the position of tubular product sample 3 is adjusted,
And paste foil gauge 4 in the middle of the outer surface of tubular product sample 3 at bulging area point M, connection foil gauge 4 and deformeter 5 with measurement point M at
Strain, by paste foil gauge 4 tubular product sample 3 be fitted into the expanding die 2；
Step 4, tubing sealing：The two ends of tubular product sample to be measured 3 are sealed using corresponding sealing means, high-voltage power supply 8 is by height
Pressure fluid media (medium) is filled with inside tubular product sample 3 by one end of the tubular product sample 3 after sealing, the probe inserting of pressure sensor 6
The other end of tubular product sample 3 after sealing, the high-voltage power supply 8, the deformeter 5 and the pressure sensor 6 are all connected with point
Analysis test system 7；
Step 5, bulging test：To high-pressure fluid medium is gradually filled with the tubular product sample 3 of step 4, tubular product sample 3 exists
There is bulging under the collective effect of bulging internal pressure P and expanding die 2 until rupturing, the bulging internal pressure P's in record Bulging Process
Axial strain and hoop strain at change, bulging area peak M；
Step 6, data analysis：Above-mentioned experimental data is processed by analysis of test system 7 can obtain tubular product sample 3 and exist
Pressure and limiting strain forming property parameter are burst under this load path.By the surface clean of tubular product sample 3 in step 2
It is totally in order to facilitate strain measurement, high-pressure fluid medium is revealed when the sealing of the two ends of tubular product sample 3 prevents bulging in step 4
Cause internal pressure P not enough.Analysis of test system is the improvement of the THF.HIT-160/110-A that Harbin Institute of Technology has developed,
With data exchange interface.Existing patent：ZL200910071699.X, ZL201210584492.4, software copyright：Tubing power
Learn the hydraulic expanding-forming method Analytical software of performance, registration number：2013SR108454；The hot gas pressure compacting system super-pressure of metal
Bleed pressure precise control software, registration number：2016SR180392.
With reference to Fig. 1 and Fig. 3-Fig. 5 explanations, it is preferable that sealing means are tapered punch rigid seal, strain in the present embodiment
Metering system is measured for foil gauge, and high-pressure fluid medium is liquid or gas.Advantage using gas medium is：Gas medium
Suitable for the forming property of tubing under test high temperature.
Implement particular by following steps：
Step one, Mold Making：Design according to actual needs and process with specific bulging confining region shape and major diameter
Than the expanding die 2 of change procedure.
It is prepared by step 2, sample：Assuming that the external diameter of tubular product sample 3 is D0, initial draw ratio is λ0, expanding die 2 is corresponding swollen
Shape angle is θ.
The corresponding tubing of expanding die 2 fixes head of district s, and the end part seal of tubular product sample 3 needs s ' long, then tube bulge area
Initial length l0=D0λ0, the length L=l of tubular product sample 30+2s+2s’.Tubular product sample 3 is intercepted by length L, and by tubular product sample
3 surface cleans are clean.
Step 3, installation are fixed：It is stickup foil gauge 4 at point M in the outer surface of tubular product sample 3 middle part vertically,
Connection foil gauge 4 and deformeter 5 are with the strain at measurement point M.Expanding die 2 is fixed on a test platform, by tubing
Sample 3 is fitted into expanding die 2, adjusts measurement of the position of tubular product sample 3 in order to strain at middle bulging area point M.Connection
Hole on the tapered punch 1 of high-voltage power supply 8 and side is filled with high-pressure fluid medium to facilitate.Connection pressure sensor 6 and opposite side
Tapered punch 1 on hole being convenient for measuring pressure P.
Step 4, tubing sealing：Two tapered punch 1 are headed into the two ends of tubular product sample 3 respectively, in the work of axial thrust
The two ends of tubular product sample 3 are carried out into enlarging with inferior pyramidal drift 1 and flared part is tightly pressed against tapered punch 1 and expanding die 2
Between, so as to realize the end part seal of tubular product sample 3.
Step 5, bulging test：By high-voltage power supply 8 to high-pressure fluid medium is gradually filled with tubular product sample 3, until tubing
Sample 3 ruptures.As the continuous rising tubular product sample 3 of internal pressure P is plastically deformed, the outer surface of tubular product sample 3 is gradually
The bulging confining region of expanding die 2 is abutted in, the tubing of abutting section suffers restraints and bulging no longer occurs.With bulging degree
Increase, tube bulge area draw ratio is gradually reduced.Experimental data in record bulging test process, including：Bulging pressure P, axle
To strain and hoop strain etc..
Step 6, data analysis：Tubular product sample can be obtained by processing above-mentioned experimental data under this load path
Bulging limit coefficient, burst pressure and limiting strain forming property parameter.By multiple bulging test experiments, can obtain
A series of forming property parameter of tubing under load paths, the forming property to tubing makes overall merit.
With reference to Fig. 1 and Fig. 6 explanations, it is preferable that the sealing means of tubular product sample 3 are close using welding end socket in the present embodiment
Envelope, strain measurement mode is measured for foil gauge, and high-pressure fluid medium is liquid or gas.Advantage using gas medium is：
Gas medium is applied to the forming property of tubing under test high temperature.Using welding end socket sealing means advantage be：Welding knot
Structure eliminates the mechanical structure for promoting tapered punch 1, and bulging experimental provision is simplified.
Tubing is sealed：At the two ends of tubular product sample 3, respectively end socket 11 is welded in welding one, is polished flat welding point after being welded
It is whole.
Install and fix：The surface clean of tubular product sample 3 is clean, be in the outer surface of tubular product sample 3 middle part vertically
Upper foil gauge 4 is pasted at point M, connection foil gauge 4 and deformeter 5 are with the strain at measurement point M.Connection high-voltage power supply 8 and side
Hole on welding end socket 11 is filled with high-pressure fluid medium to facilitate.On the welding end socket 11 of connection pressure sensor 6 and opposite side
Hole being convenient for measuring pressure P.To post the tubular product sample 3 of foil gauge 4 according to structure shown in Fig. 6 load that design processes it is swollen
In shape mould 2, expanding die 2 is fixed on an experiment porch, and expanding die 2 is moved when preventing bulging influences bulging to survey
Test result.
Bulging is tested：By high-voltage power supply 8 to high-pressure fluid medium is gradually filled with tubular product sample 3, until tubular product sample 3 is sent out
Raw rupture.As the continuous rising tubular product sample 3 of internal pressure P is plastically deformed, the outer surface of tubular product sample 3 gradually abuts in
The bulging confining region of expanding die 2, the tubing of abutting section suffers restraints and bulging no longer occurs.With the increase of bulging degree,
Tube bulge area draw ratio λ is gradually reduced.Experimental data in record bulging test process, including：Bulging pressure P, bulging are high
Degree h, axial strain and hoop strain etc..
Data analysis：By processing above-mentioned experimental data, can to obtain the limit of the tubular product sample under this load path swollen
Shape coefficient, burst the forming property parameter such as pressure and limiting strain.By multiple bulging test experiments, can obtain a series of
The forming property parameter of tubing under load path, the forming property to tubing makes overall merit.
With reference to Fig. 1 and Fig. 7 explanations, it is preferable that the sealing means of tubular product sample 3 use sealing ring and sealing in the present embodiment
Plug combination, strain measurement mode is measured for foil gauge, and high-pressure fluid medium is liquid or gas.Using gas medium
Advantage is：Gas medium is applied to the forming property of tubing under test high temperature.Advantage using sealing ring sealing means is：
Sealing means are simple and reliable, it is easy to accomplish.
Tubing is sealed：Appropriately sized sealing ring 13 is inserted in the groove of sealing plug 12 before sealing, will during sealing
The insertion tubular product sample 3 of sealing plug 12 of sealing ring 13 is cased with, so as to realize the end part seal of tubular product sample 3.
Install and fix：The surface clean of tubular product sample 3 is clean, be in the outer surface of tubular product sample 3 middle part vertically
Upper foil gauge 4 is pasted at point M, connection foil gauge 4 and deformeter 5 are with the strain at measurement point M.Connection high-voltage power supply 8 and side
Hole on sealing plug 13 is filled with high-pressure fluid medium to facilitate.On the sealing plug 13 of connection pressure sensor 6 and opposite side
Hole being convenient for measuring pressure P.To post the tubular product sample 3 of foil gauge 4 according to structure shown in Fig. 7 load that design processes it is swollen
In shape mould 2, expanding die 2 is fixed on an experiment porch, and expanding die 2 is moved when preventing bulging influences bulging to survey
Test result.
Bulging is tested：By high-voltage power supply 8 to high-pressure fluid medium is gradually filled with tubular product sample 3, until tubular product sample 3 is sent out
Raw rupture.As the continuous rising tubular product sample 3 of internal pressure P is plastically deformed, the outer surface of tubular product sample 3 gradually abuts in swollen
The bulging confining region of shape mould 2, the tubing of abutting section suffers restraints and bulging no longer occurs.With the increase of bulging degree, pipe
Material bulging area draw ratio λ is gradually reduced.Experimental data in record bulging test process, including：Bulging pressure P, axial strain
And hoop strain etc..
Data analysis：By processing above-mentioned experimental data, can to obtain the limit of the tubular product sample under this load path swollen
Shape coefficient, burst the forming property parameter such as pressure and limiting strain.By multiple bulging test experiments, can obtain a series of
The forming property parameter of tubing under load path, the forming property to tubing makes overall merit.
Such as Fig. 2 explanations, in another embodiment, the method for tubing forming property is under a kind of test complex strain paths
Realized according to following steps：
Step one, Mold Making：Design according to actual needs and process with specific bulging confining region shape and major diameter
Than the tube bulge mould 2 for changing；
It is prepared by step 2, sample：Interception certain length tubular product sample 3 is needed according to experiment, and the surface of tubular product sample 3 is clear
Wash clean；
Step 3, installation are fixed：Expanding die 2 is fixed on a test platform, the position of tubular product sample 3 is adjusted,
And the speckle of a floor random distribution is sprayed in the middle of the outer surface of tubular product sample 3 around bulging area point M, the tubing examination of speckle will be sprayed with
Sample 3 is fitted into the expanding die 2, and makes point M just to CCD camera 9, and Strain Analysis System 10 is connected with the CCD camera 9；
Step 4, tubing sealing：The two ends of tubular product sample 3 are sealed using corresponding sealing means, high-voltage power supply 8 is by high-pressure spray
Body medium is filled with inside tubular product sample 3 by the one end of tubular product sample 3 after sealing, and the probe of pressure sensor 6 is inserted into close
The other end of the tubular product sample 3 being honored as a queen, the high-voltage power supply 8, Strain Analysis System 10 and the pressure sensor 6 are all connected with analysis
Test system；
Step 5, bulging test：To high-pressure fluid medium is gradually filled with the tubular product sample 3 of step 4, tubular product sample 3 exists
There is bulging under the collective effect of internal pressure P and expanding die 2 until rupture, bulging pressure P changing values, swollen in record Bulging Process
Axial strain and hoop strain at shape area peak；
Step 6, data analysis：Above-mentioned experimental data is processed by analysis of test system 7 can obtain tubular product sample 3 and exist
Pressure and limiting strain forming property parameter are burst under this load path.
By the surface clean of tubular product sample 3 it is totally tubular product sample 3 in step 4 in order to facilitate strain measurement in step 2
High-pressure fluid medium leakage causes internal pressure P not enough when two ends sealing prevents bulging.Speckle state is with bulging degree in step 3
Change and change, CCD camera 9 can capture speckle variations and transfer data to Strain Analysis System 10, so analyze
Go out the strain at intermediate point M in the Bulging Process of tubular product sample 3.
In the present embodiment, Strain Analysis System 10 is preferentially from the XTDIC three-dimensional optical speckle systems of Xi'an Communications University.
XTDIC systems are a kind of optical non-contact measurement system for three-dimensional deformation, for the survey of object surface appearance, displacement and strain
Amount and analysis, and three dimensional strain field data is obtained, intuitive measurement results show.XTDIC system combination digital image correlation techniques
(DIC) and technique of binocular stereoscopic vision, by setting seed point, the speckle image of body surface is followed the trail of, in realizing deformation process
The measurement of the three-dimensional coordinate, displacement and strain of body surface.CCD camera is wanted by XTDIC system supports, the universal product without special
Ask.The strain data that Strain Analysis System will can be measured is sent to analysis test by procotol (or other host-host protocols)
In system.
With reference to Fig. 2 and Fig. 3-Fig. 5 explanations, it is preferable that sealing means are tapered punch rigid seal, strain in the present embodiment
Metering system is non-contact type strain measurement, and high-pressure fluid medium is liquid or gas.Advantage using gas medium is：Gas
Body medium is applied to the forming property of tubing under test high temperature.
Install and fix：It is to spray one in certain limit around point M in the outer surface of tubular product sample 3 middle part vertically
The spot (speckle) of layer random distribution.To be sprayed with the tubular product sample 3 of speckle according to structure shown in Fig. 3 load that design processes it is swollen
In shape mould 2, and make point M just to CCD camera 9.Expanding die 2 is fixed on an experiment porch, bulging die when preventing bulging
Tool 2 is moved influences bulging test result.Hole on the tapered punch 1 of connection high-voltage power supply 8 and side is filled with high pressure to facilitate
Fluid media (medium).The hole on the tapered punch 1 of pressure sensor 6 and opposite side is connected to be convenient for measuring pressure P.Speckle state with
The change of bulging degree and change, CCD camera 9 can capture speckle variations and transfer data to Strain Analysis System 10,
And then analyze the strain in the Bulging Process of tubular product sample 3 at intermediate point M.
With reference to Fig. 2 and Fig. 6 explanations, it is preferable that sealing means are using welding end socket mode, strain measurement side in the present embodiment
Formula is non-contact type strain measurement, and high-pressure fluid medium is liquid or gas.Advantage using gas medium is：Gas medium
Suitable for the forming property of tubing under test high temperature.Using welding end socket sealing means advantage be：Welding structure is eliminated
The mechanical structure of tapered punch 1 is promoted, bulging experimental provision is simplified.
Install and fix：It is to spray one in certain limit around point M in the outer surface of tubular product sample 3 middle part vertically
Layer speckle.The tubular product sample 3 of speckle will be sprayed with to load in the expanding die 2 that design is processed according to structure shown in Fig. 4, and made a little
M is just to the CCD camera 9 of contactless strain-type.Expanding die 2 is fixed on an experiment porch, bulging die when preventing bulging
Tool 2 is moved influences bulging test result.Hole on the welding end socket 11 of connection high-voltage power supply 8 and side is filled with high pressure to facilitate
Fluid media (medium).The hole on the welding end socket 11 of pressure sensor 6 and opposite side is connected to be convenient for measuring pressure P.
With reference to Fig. 2 and Fig. 7 explanations, it is preferable that sealing means are using sealing ring and sealing plug combination side in the present embodiment
Formula, strain measurement mode is non-contact type strain measurement, and high-pressure fluid medium is liquid or gas.Using the advantage of gas medium
It is：Gas medium is applied to the forming property of tubing under test high temperature.Advantage using sealing ring sealing means is：Sealing
Mode is simple and reliable, it is easy to accomplish.
Install and fix：It is to spray one in certain limit around point M in the outer surface of tubular product sample 3 middle part vertically
Layer speckle.The tubular product sample 3 of speckle will be sprayed with to load in the expanding die 2 that design is processed according to structure shown in Fig. 5, and made a little
M is just to the CCD camera 9 of contactless strain analysis measuring system.Expanding die 2 is fixed on an experiment porch, prevents swollen
Expanding die 2 is moved during shape influences bulging test result.Kong Yifang on the sealing plug 12 of connection high-voltage power supply 8 and side
Just it is filled with high-pressure fluid medium.The hole on the sealing plug 12 of pressure sensor 6 and opposite side is connected to be convenient for measuring pressure P.
The present invention is disclosed as above with preferable case study on implementation, but is not limited to the present invention, any to be familiar with this specialty
Technical staff, without departing from the scope of the present invention, when can utilize the disclosure above structure and technology contents do
Go out a little change or be modified to the equivalence enforcement case of equivalent variations, but it is every without departing from technical solution of the present invention
Hold, according to any simple modification, equivalent variations and modification that technical spirit of the invention is made to above case study on implementation, still belong to
Technical solution of the present invention scope.
Claims (10)
1. it is a kind of test complex strain paths under tubing forming property method, it is characterised in that：Methods described is according to following
What step was realized：
Step one, Mold Making：Design according to actual needs and process and become with specific bulging confining region shape and draw ratio
The tube bulge mould (2) of change；
It is prepared by step 2, sample：Interception certain length tubular product sample (3) is needed according to experiment, and tubular product sample (3) surface is clear
Wash clean；
Step 3, installation are fixed：Expanding die (2) is fixed on a test platform, the position of adjustment tubular product sample (3),
And foil gauge (4) is pasted at point M places of bulging area in the middle of tubular product sample (3) outer surface, connect foil gauge (4) and deformeter (5) with
Strain at measurement point M, the tubular product sample (3) for pasting strain (4) is fitted into the expanding die (2)；
Step 4, tubing sealing：Tubular product sample to be measured (2) two ends are sealed using corresponding sealing means, high-voltage power supply (8) is by height
Pressure fluid media (medium) is filled with tubular product sample (3) inside, the spy of pressure sensor (6) by one end of the tubular product sample (3) after sealing
The other end of head inserting tubular product sample (3) after sealing, the high-voltage power supply (8), the deformeter (5) and the pressure sensing
Device (6) is all connected with analysis of test system (7)；
Step 5, bulging test：To high-pressure fluid medium is gradually filled with the tubular product sample (3) of step 4, tubular product sample (3) exists
There is bulging under the collective effect of bulging internal pressure P and expanding die (2) until rupture, the bulging internal pressure P in record Bulging Process
Change, axial strain and hoop strain at bulging area peak M；
Step 6, data analysis：Tubular product sample (3) can be obtained by analysis of test system (7) the above-mentioned experimental data for the treatment of to exist
Pressure and limiting strain forming property parameter are burst under this load path.
2. according to claim 1 it is a kind of test complex strain paths under tubing forming property method, it is characterised in that：Institute
It is liquid or gas to state the high-pressure fluid medium in step 5.
3. a kind of method for testing tubing forming property under complex strain paths according to claim 1 or claim 2, its feature exists
In：Sealing is realized in the end that the smaller diameter end of tapered punch (1) heads into the tubular product sample (3) by the step 4.
4. a kind of method for testing tubing forming property under complex strain paths according to claim 1 or claim 2, its feature exists
In：The step 4 will weld the end realization sealing that end socket (11) is welded on tubular product sample (3).
5. a kind of method for testing tubing forming property under complex strain paths according to claim 1 or claim 2, its feature exists
In：Realize sealing in the end that the step 4 inserts tubular product sample (3) by being set with the sealing plug (12) of sealing ring (13).
6. it is a kind of test complex strain paths under tubing forming property method, it is characterised in that methods described is according to following step
Rapid realization：
Step one, Mold Making：Design according to actual needs and process and become with specific bulging confining region shape and draw ratio
The tube bulge mould (2) of change；
It is prepared by step 2, sample：Interception certain length tubular product sample (3) is needed according to experiment, and tubular product sample (3) surface is clear
Wash clean；
Step 3, installation are fixed：Expanding die (2) is fixed on a test platform, the position of adjustment tubular product sample (3),
And the speckle of a floor random distribution is sprayed in the middle of tubular product sample (3) outer surface around bulging area point M, the tubing of speckle will be sprayed with
Sample (3) is fitted into the expanding die (2), and makes point M just to CCD camera (9), Strain Analysis System (10) and the CCD
Camera (9) is connected；
Step 4, tubing sealing：Tubing to be measured (3) sample two ends are sealed using corresponding sealing means, high-voltage power supply (8) is by height
Pressure fluid media (medium) is filled with tubular product sample (3) inside, the spy of pressure sensor (6) by one end of the tubular product sample (3) after sealing
The other end of head inserting tubular product sample (3) after sealing, the high-voltage power supply (8), Strain Analysis System (10) and the pressure
Sensor (6) is all connected with analysis of test system；
Step 5, bulging test：To high-pressure fluid medium is gradually filled with the tubular product sample (3) of step 4, tubular product sample (3) exists
Under the collective effect of internal pressure P and expanding die (2) occur bulging until rupture, record Bulging Process in bulging pressure P changing values,
Axial strain and hoop strain at bulging area peak M；
Step 6, data analysis：Tubular product sample (3) can be obtained by analysis of test system (7) the above-mentioned experimental data for the treatment of to exist
Pressure and limiting strain forming property parameter are burst under this load path.
7. according to claim 6 it is a kind of test complex strain paths under tubing forming property method, it is characterised in that：Institute
It is liquid or gas to state the high-pressure fluid medium in step 5.
8. a kind of method for testing tubing forming property under complex strain paths according to claim 6 or 7, its feature exists
In：Sealing is realized in the end that the smaller diameter end of tapered punch (1) heads into tubular product sample (3) by the step 4.
9. a kind of method for testing tubing forming property under complex strain paths according to claim 6 or 7, its feature exists
In：The step 4 will weld the end realization sealing that end socket (11) is welded on tubular product sample (3).
10. a kind of method for testing tubing forming property under complex strain paths according to claim 6 or 7, its feature exists
In：Realize sealing in the end that the step 4 inserts tubular product sample (3) by being set with the sealing plug (12) of sealing ring (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235602.0A CN106840922B (en) | 2016-12-28 | 2016-12-28 | A kind of method of tubing forming property under test complex strain paths |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235602.0A CN106840922B (en) | 2016-12-28 | 2016-12-28 | A kind of method of tubing forming property under test complex strain paths |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106840922A true CN106840922A (en) | 2017-06-13 |
| CN106840922B CN106840922B (en) | 2019-11-05 |
Family
ID=59112614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611235602.0A Active CN106840922B (en) | 2016-12-28 | 2016-12-28 | A kind of method of tubing forming property under test complex strain paths |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106840922B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941609A (en) * | 2017-10-31 | 2018-04-20 | 太原理工大学 | A kind of method and apparatus for establishing thin-wall pipes forming limit diagram |
| CN113319208A (en) * | 2021-04-25 | 2021-08-31 | 东莞材料基因高等理工研究院 | Method for eliminating residual stress of cold drawn pipe |
| CN113624602A (en) * | 2021-07-29 | 2021-11-09 | 中国科学院金属研究所 | Experimental device and construction method for right area curve of pipe forming limit diagram |
| WO2021261700A1 (en) * | 2020-06-23 | 2021-12-30 | 주식회사 엘지에너지솔루션 | System and method for fatigue testing of metal foil |
| CN114486550A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Free bulging test method and system for downhole variable-temperature patching pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200993626Y (en) * | 2006-09-28 | 2007-12-19 | 新疆屯河节水科技有限公司 | Pipe sample hydraulic experiment mounting device |
| CN101907543A (en) * | 2010-08-11 | 2010-12-08 | 中国水利水电科学研究院 | Method and equipment for measuring compressive strength and anti-explosion capability of tubing |
| CN102445384A (en) * | 2011-09-22 | 2012-05-09 | 西北工业大学 | Clamp for testing annular tensile property of tubular product |
| CN102866064A (en) * | 2012-09-28 | 2013-01-09 | 哈尔滨工业大学 | Tube bulging forming limit test device and method under bi-directional pressurization condition |
| CN103528899A (en) * | 2013-11-01 | 2014-01-22 | 哈尔滨工业大学 | Tube forming performance testing device and method under combined action of internal and external pressure |
| CN105300802A (en) * | 2015-10-20 | 2016-02-03 | 哈尔滨工业大学 | Bidirectional stress state stress-strain measurement device and method for thin-walled tube |
-
2016
- 2016-12-28 CN CN201611235602.0A patent/CN106840922B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200993626Y (en) * | 2006-09-28 | 2007-12-19 | 新疆屯河节水科技有限公司 | Pipe sample hydraulic experiment mounting device |
| CN101907543A (en) * | 2010-08-11 | 2010-12-08 | 中国水利水电科学研究院 | Method and equipment for measuring compressive strength and anti-explosion capability of tubing |
| CN102445384A (en) * | 2011-09-22 | 2012-05-09 | 西北工业大学 | Clamp for testing annular tensile property of tubular product |
| CN102866064A (en) * | 2012-09-28 | 2013-01-09 | 哈尔滨工业大学 | Tube bulging forming limit test device and method under bi-directional pressurization condition |
| CN103528899A (en) * | 2013-11-01 | 2014-01-22 | 哈尔滨工业大学 | Tube forming performance testing device and method under combined action of internal and external pressure |
| CN105300802A (en) * | 2015-10-20 | 2016-02-03 | 哈尔滨工业大学 | Bidirectional stress state stress-strain measurement device and method for thin-walled tube |
Non-Patent Citations (1)
| Title |
|---|
| 徐永超等: "半球底筒形件充液拉深加载路径优化研究", 《哈尔滨工业大学学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941609A (en) * | 2017-10-31 | 2018-04-20 | 太原理工大学 | A kind of method and apparatus for establishing thin-wall pipes forming limit diagram |
| WO2021261700A1 (en) * | 2020-06-23 | 2021-12-30 | 주식회사 엘지에너지솔루션 | System and method for fatigue testing of metal foil |
| CN114486550A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Free bulging test method and system for downhole variable-temperature patching pipe |
| CN113319208A (en) * | 2021-04-25 | 2021-08-31 | 东莞材料基因高等理工研究院 | Method for eliminating residual stress of cold drawn pipe |
| CN113624602A (en) * | 2021-07-29 | 2021-11-09 | 中国科学院金属研究所 | Experimental device and construction method for right area curve of pipe forming limit diagram |
| CN113624602B (en) * | 2021-07-29 | 2022-07-15 | 中国科学院金属研究所 | Experimental device and construction method for right area curve of pipe forming limit diagram |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106840922B (en) | 2019-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106840922B (en) | A kind of method of tubing forming property under test complex strain paths | |
| CN100467996C (en) | Heat-conductive pipe and mfg. method | |
| Han et al. | Tailor layered tube hydroforming for fabricating tubular parts with dissimilar thickness | |
| CN102554009B (en) | Fluid pressure forming method for small-radius elbow | |
| CN104634665A (en) | Pipe liquid filling bulging test method and device | |
| CN107941609B (en) | Method and device for establishing forming limit diagram of thin-wall pipe | |
| CN110763568B (en) | Method for determining thickness anisotropy coefficient of pipe in any direction | |
| CN107971382A (en) | It is a kind of to can be used for panel stiffness mould bulging and the device and method of hydraulic bulge test | |
| CN109991148A (en) | Carbon dioxide blasting impact dynamic monitoring tester and its test method | |
| US11175206B2 (en) | Tube pure shear loading device and method | |
| CN107084821A (en) | A kind of HTHP horizontal well packer simulation test device | |
| CN109561530B (en) | Manufacturing method of electric heating tube special for critical heat flux density test | |
| CN110480260A (en) | A kind of large diameter thin wall annular titanium alloy tube preparation method | |
| CN106680106A (en) | Simulation experiment device and method for mudstone and drilling liquid interaction under stratum conditions | |
| CN104749040B (en) | Test detection device and method for high-temperature packer rubber cylinder | |
| Chu et al. | Axial hydro-forging sequence for variable-diameter tube of 6063 aluminum alloy | |
| CN103196758A (en) | Device and method for testing forming property of sheet material under effect of fluid pressure | |
| CN107442636B (en) | The corrugated removing method of curved surface member forming device, formed parts and system | |
| CN206741940U (en) | End cap for nuclear fuel rod | |
| CN106644730B (en) | Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method | |
| CN110487640B (en) | Reducing expansion cone test device | |
| Feng et al. | Deformation behavior in the hydroforming of overlapping tubular blanks | |
| CN104897860A (en) | Novel expanding connection technology and assessment method | |
| CN103712862A (en) | Device for testing expansion performance of magnesium alloy tubular product | |
| CN114459652B (en) | Test device for evaluating performance of expandable pipe and external sealing module thereof and evaluation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: He Zhubin Inventor after: Zhang Kun Inventor after: Zhu Haihui Inventor after: Yuan Shijian Inventor before: He Zhubin Inventor before: Zhu Haihui Inventor before: Yuan Shijian |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |