CN106644730A - Stress-strain measuring device and method for thin-plate transformation process under complex stress path - Google Patents
Stress-strain measuring device and method for thin-plate transformation process under complex stress path Download PDFInfo
- Publication number
- CN106644730A CN106644730A CN201611240021.6A CN201611240021A CN106644730A CN 106644730 A CN106644730 A CN 106644730A CN 201611240021 A CN201611240021 A CN 201611240021A CN 106644730 A CN106644730 A CN 106644730A
- Authority
- CN
- China
- Prior art keywords
- plate
- stress
- thin
- die
- strain
- 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
- 238000000034 method Methods 0.000 title claims abstract description 71
- 230000008569 process Effects 0.000 title claims abstract description 50
- 230000009466 transformation Effects 0.000 title abstract 5
- 239000000463 material Substances 0.000 claims abstract description 40
- 238000003825 pressing Methods 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract 2
- 238000002474 experimental method Methods 0.000 claims description 14
- 238000005183 dynamical system Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 9
- 210000003205 muscle Anatomy 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 7
- 238000005516 engineering process 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
- 230000026676 system process Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- VYQRBKCKQCRYEE-UHFFFAOYSA-N ctk1a7239 Chemical compound C12=CC=CC=C2N2CC=CC3=NC=CC1=C32 VYQRBKCKQCRYEE-UHFFFAOYSA-N 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- 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
- G01N2203/0017—Tensile
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0272—Cruciform 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
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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A stress-strain measuring device and method for a thin-plate transformation process under a complex stress path are used for solving the problem that under the complex stress path, deformation characteristics of a material cannot be accurately and totally described, which is caused by existing devices and methods that cannot obtain stress-strain data of the plate transformation process under a general complex path loading condition. The stress-strain measuring device for the thin-plate transformation process under the complex stress path comprises a base, a force application mechanism, a liquid-filling pressing plate, an upper template, a glass plate, a ladder concave die, a pressure sensor, a control system, a liquid-filling pressure system, a power system, a CCD camera, and a plurality of supporting blocks and connection rods. The measuring method includes the following steps: (1) manufacturing the ladder concave die and cutting the thin-plate; (2) conducting assembly and liquid filling; (3) conducting plate bulging; (4) acquiring stress-strain information; (5) disassembling the device and saving experimental data. The stress-strain measuring device and method for the thin-plate transformation process under the complex stress path is used for thin-plate stress-strain measurements under the complex stress path.
Description
Technical field
The present invention relates to thin-wall boards deformation process stress-strain measurement device and method, and in particular to complicated stress environment
Lower thin sheet deformation process stress-strain measurement device and method.
Background technology
As new- and high-tech weaponry is to high reliability and long-life requirement, in the urgent need to replacing tradition using integrated member
Welding package assembly.To realize the shaping of such complex thin-wall integrated member, generally require to experience complicated deformation process, plate
The change of blank shape, size and boundary condition in material deformation process results in stress path and changes, and load path is presented
Go out non-linear.
Actual thin-wall boards all have a certain degree of anisotropy, and difference can be shown under different load paths
Deformation characteristic and forming property, need to obtain corresponding stress, strain etc. with the experiment of as far as possible close actual molding condition
Data, so as to realize the accurate description to sheet properties and sign.In the past, mainly using simple tension, circular die bulging or
The methods such as oval mould bulging carry out test material performance.But, it is changeless that above-mentioned these methods can only all obtain certain
Material deformation data under stress state, i.e., the stress axis of both direction keep constant in deformation process in plate plane.
For example, what is obtained during simple tension is uniaxial stress state, and what circular die bulging was obtained is the tensile stress state such as two-way, oval
What shape mould bulging was obtained is the biaxial tension stress state that both direction stress value is not waited.These load paths are referred to as simply
Loading or load on rate.
In recent years, sheet material biaxial tension experimental technique and special biaxial tension test system are occurred in that.Using special design
Cruciform specimen, by adjust and control two mutually perpendicular directions tensile force and draw speed be capable of achieving sample it is two-way
Loading experiment.By the power of testing machine, displacement and strain measurement system, the stress of material in deformation process, strain can be obtained
Etc. data.At present, cross sample biaxial tension experiment has been widely used for testing the mechanical property of sheet material.For in theory, adopt
With cross sample biaxial tension experiment material can also be made to deform under the conditions of certain non-proportion loading, i.e., two in deformation process
There is respective change in the stress axis of individual orthogonal directions.But, because the shape of cross sample in drawing process will be with
The carrying out of deformation and constantly change, when equivalent strain is more than 10% even more fractional value, substantial deviation is former for sample
Some cross shapes, its deformation is highly unstable or uncontrollable, therefore also just cannot reentry follow-up stress, strain etc.
Test data.This is not enough, and seriously limiting the application of cross sample biaxial tension experimental technique, particularly the method cannot use
In obtaining the material stress of the unsteady deformation of phase and ultimate failure failure stage, strain information after the test.
As described above, actual thin-wall boards are particularly the obvious sheet material of anisotropy will show under the conditions of complex loading
Diverse deformational behavior.But, whether one way tensile test, circle/ellipse mould bulging experiment, or sheet material ten
The biaxial tension of word sample is tested, and can only all realize simple loading environment, or can only realize the disproportional compared with small deformation degree
Complex loading condition.Using these experiments, the stress of whole deformation process under the conditions of general complex loading, strain cannot be all obtained
Data, so as to cannot accurately, comprehensively describe deformation characteristic of the material under complicated stress environment.
Accordingly, it would be desirable to set up can realize the condition of complex strain paths and obtain the ess-strain in deformation process letter
Breath, so as to the deformational behavior to sheet material under the conditions of complex loading carries out accurate description.
The content of the invention
The present invention is cannot to obtain sheet material in general pahtfinder hard loading environment to solve existing experimental rig and method
Stress, the strain data of lower whole deformation process, it is special so as to cannot accurately, comprehensively describe deformation of the material under complicated stress environment
Property problem, and then provide a kind of complicated stress environment lower thin sheet deformation process stress-strain measurement device and method.
The present invention is in order to realize that above-mentioned technical problem is adopted the technical scheme that：
Complicated stress environment lower thin sheet deformation process stress-strain measurement device include base, force application mechanism, topping up pressing plate,
It is upper die plate, glass plate, ladder die, pressure sensor, control system, supercharging pressure system, dynamical system, CCD camera, multiple
Support block and multiple connecting rods；
The base is connected by many connecting rods with the upper die plate, be machined with the ladder die aperture by
Decrescence little tapered hole, the end face that the osculum in the tapered hole of the ladder die is located fixes company with the lower surface of the upper die plate
Connect, force application mechanism is installed on the base below the ladder die, the output end of the force application mechanism is fixed with
The topping up pressing plate, the topping up pressing plate is oppositely arranged with the big opening end in the tapered hole of the ladder die, on the upper die plate
The peephole with the osculum insertion in the tapered hole of the ladder die is offered, the upper surface of the upper die plate is provided with multiple institutes
Support block is stated, the glass plate is installed in multiple support blocks；The glass plate and the upper die plate are horizontally disposed；
The CCD camera, the topping up pressing plate upper surface and the rank are disposed with directly over the peephole of the upper die plate
Sealing arrangement has thin plate to be measured between the end face that the big mouth in the tapered hole of terraced die is located, and random point is coated with the thin plate
One plate face of the speckle of cloth is arranged towards CCD camera, and the liquid medium of the dynamical system exports the liquid with the force application mechanism
Body medium inlet connects, and the supercharging pressure system is connected with the pressure medium inlet of the topping up pressing plate, the supercharging pressure
It is provided with the outlet conduit of system for the pressure sensor of detection outlet pressure medium, the picture signal of the CCD camera
Output end is connected with the picture signal input of the control system, the signal output end of the pressure sensor with it is described
The pressure signal input end connection of control system, the control system is used to process the image information and pressure information of input.
Complicated stress environment lower thin sheet deformation process stress-strain measuring method, realizes according to following steps：
Step one, empirically need to design and produce corresponding ladder die, and thin plate is cut according to requirement of experiment；
Step 2, thin plate is positioned between topping up pressing plate upper surface and ladder die, is led under control of the control system
Cross electrohydraulic servo valve liquid medium in dynamical system is passed in force application mechanism, force application mechanism output end promote topping up pressing plate to
The motion of ladder die is sealed so as to thin plate be compressed；
Step 3, control system control supercharging pressure system are led to through pressure medium inlet between thin plate and topping up pressing plate
Entering pressure medium makes thin plate to ladder die direction bulging, with the carrying out of bulging, mould is subject to when thin plate is contacted with ladder die
Outer contour shape changes when the effect of tool causes sheet bulging；
The pressure value of pressure medium, CCD camera register between step 4, pressure sensor collection thin plate and topping up pressing plate
The change of speckle when plate deforms；Above- mentioned information is passed to control system and processes by analysis and obtains thin plate in the position of various location
The pressure information of shifting, stress, strain and pressure medium；
Step 5, the bulging for making thin plate generation stable and lasting deform until rupturing, preservation experimental data, after pulling down experiment
The sheet material of deformation.
The invention has the beneficial effects as follows：First, ladder die bulging method proposed by the present invention is recessed by ladder in Bulging Process
Mould enters row constraint to sheet material during bulging so that sheet material stress state of apex in Bulging Process changes, so as to realize
Sheet material deforms under complex strain paths, and obtaining corresponding stress-strain data is used for theoretical research.Realize process more
Simply, it is not necessary to special equipment, it is simple.
2nd, different complex strain paths can be just realized by changing the cross sectional shape of ladder die, without the need for entering stroke
Sequence is controlled, therefore loading procedure is simple and continuous, stable, the stress-strain data of overall process can completely, accurate measurement.
3rd, the present invention is formed by connecting the major architectural of device using base, connecting rod and upper die plate, simple structure and it is tight
Gather；Seal pressure is provided using single driver element, is simply easy to operation.
4th, stress value can be calculated by computing formula in sheet material Bulging Process, involved ginseng in computing formula
Number can be obtained by CCD camera accurate measurement and through control system process, and results of stress is accurate；Strain value is to pass through
CCD camera measurement is obtained via control system process, and strain measurement result is accurate；Therefore more can accurately obtain sheet material to exist
Ess-strain information when deforming under complex stress condition.
5th, strain measurement is then measured by CCD camera and obtained through process by spraying speckle on sheet material, without the need for
Paste foil gauge or using the instruments such as spherometer, simple to operate and measurement result reliability.
6th, sample prepares simple, it is only necessary to which sheet material is made into sizeable circular specimen.
Description of the drawings
Fig. 1 is complicated stress environment lower thin sheet deformation process stress-strain measurement schematic device, and Fig. 2 is using CCD phases
The schematic diagram that machine is measured to sheet deformation process, Fig. 3 realizes sheet material bulging schematic diagram for conventional elliptical openings die, schemes
4 is that sheet material outer contour shape analysis schematic diagram is obtained after bulging, and Fig. 5 a are the ladder die schematic diagram with tapered hole, and Fig. 5 b are
Ladder die cross section connects rotund schematic shapes, and Fig. 5 c are less than figure for the short axle of ladder die oval cross section
The schematic shapes of the radius of 5b circular cross-sections, Fig. 5 d are less than the ellipse of Fig. 5 c for the short axle of ladder die oval cross section
The schematic shapes of the short axle of shape cross section, Fig. 5 e are less than the ellipse of Fig. 5 d for the short axle of ladder die oval cross section
The schematic shapes of the short axle of cross section, Fig. 5 f are oval horizontal less than Fig. 5 e for the short axle of ladder die oval cross section
The schematic shapes of the short axle in section, Fig. 6 is that, using the sheet material schematic diagram after ladder die bulging, Fig. 7 is in each section of section
Between part not with the ladder die schematic diagram of sheet contacts, Fig. 8 be each section of section continuous and derivable transition and with the rank of sheet contacts
Terraced die schematic diagram, Fig. 9 is a kind of multistage linear loading stress path schematic diagram, and Figure 10 is a kind of Continuous Nonlinear loading stress
Path schematic diagram.
Wherein, 1 is base, and 2 is connecting rod, and 3 is force application mechanism, and 3-3 is force application mechanism liquid medium inlet, and 4 are switching
Plate, 5 is topping up pressing plate, and 5-1 is pressure medium inlet, and 5-2 is flanging sealed groove, 6 is upper die plate, and 7 is support block, and 8 is glass
Glass plate, 9 is CCD camera, and 10 is ladder die, and 10-1 is conventional ellipse opening die, 10-2 is flanging sealed muscle, 11 is pressure
Force snesor, 12 is control system, and 13 is supercharging pressure system, and 14 is dynamical system, 15 thin plates, and 16 is speckle.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.
The present invention is in order to realize that the know-why that complex strain paths are adopted is expressed as follows：
By the stress balance of the corresponding minute cells body of limit on ellipsoid in Fig. 3 and Fig. 4 or summit K places, it is obtained
Following formula：
2Ryδytσxsin(δx/2)+2RxδxtσySin (δ y/2)=p (Rxδx)(Ryδy) (1)
Wherein, δ x, δ y are length on corresponding minute cells body x, y directions in limit (summit) K places, and t is corresponding at K
Minute cells body thickness, Rx、RyAlong two principal radiuses of curvature in x-axis and y-axis direction at respectively limit (summit) K, p is plate
Sheet material pressure during material bulging.
Jing simple changes, (1) is changed into Laplace's equation：
σθ/Rθ+σφ/Rφ=p/t (2)
The length half shaft length of elliptical aperture is A, B on expanding die.On the basis of the K of summit, apart from certain that the point distance is h
The section that one plane is crossed to form with sheet material during bulging is ellipse, and its length half shaft length is designated as a, b, then：
Rx=(a2+h2)/2h (3)
Ry=(b2+h2)/2h (4)
The stress expression formula in both direction can be obtained with reference to formula (2) (3) (4)：
Wherein, α=σx/σy。
According to constancy of volume it is assumed that the expression formula of wall thickness at the P of summit can be obtained：
The strain of both directionCan be input to be processed in control system after CCD camera is measured and obtain.
Expanding die opening recited above is oval and only single shape, and sheet material is suffered two in Bulging Process
The stress axis in individual direction are certain value.If the form of ladder die mould being processed into shown in Fig. 5, ladder die is in difference
There are different cross sectional shapes, sheet material constantly can recline with mould when sheet material occurs bulging, and mould constraint sheet material is swollen at position
Shape during shape, then Rx、RyTo change, stress state during so as to changing sheet material bulging at the K of summit.With Bulging Process
R at middle summit Kx、RyBe continually changing, you can thin plate is deformed under the stress state being continually changing, that is, realize complexity stress
Path/load path.
Illustrate with reference to Fig. 1, complicated stress environment lower thin sheet deformation process stress-strain measurement device includes base 1, force
Mechanism 3, topping up pressing plate 5, upper die plate 6, glass plate 8, ladder die 10, pressure sensor 11, control system 12, supercharging pressure system
System 13, dynamical system 14, CCD camera 9, multiple support blocks 7 and multiple connecting rods 2；
The base 1 is connected by many connecting rods 2 with the upper die plate 6, is machined with the ladder die 10
Under the tapered hole that aperture is gradually reduced, the end face that the osculum in the tapered hole of the ladder die 10 is located and the upper die plate 6
Surface is fixedly connected, and on the base 1 of the lower section of the ladder die 10 force application mechanism 3, the force application mechanism 3 are provided with
Output end be fixed with the topping up pressing plate 5, the topping up pressing plate 5 is relative with the big opening end in the tapered hole of the ladder die 10
Arrange, the peephole with the osculum insertion in the tapered hole of the ladder die 10, the upper die plate are offered on the upper die plate 6
6 upper surface is provided with multiple support blocks 7, and in multiple support blocks 7 glass plate 8 is provided with；The glass plate 8
It is horizontally disposed with the upper die plate 6；
It is disposed with the CCD camera 9 directly over the peephole of the upper die plate 6, the upper surface of topping up pressing plate 5 and described
Sealing arrangement has thin plate 15 to be measured between the end face that the big mouth in the tapered hole of ladder die 10 is located, and sprays on the thin plate 15
The plate face for having the speckle 16 of random distribution is arranged towards CCD camera 9, and the liquid medium of the dynamical system 14 is exported and described
The liquid medium inlet 3-3 connections of force application mechanism 3, the supercharging pressure system 13 enters with the pressure medium of the topping up pressing plate 5
Mouth 5-1 connections, are provided with for the pressure sensing of detection outlet pressure medium on the outlet conduit of the supercharging pressure system 13
Device 11, the image signal output end of the CCD camera 9 is connected with the picture signal input of the control system 12, the pressure
The signal output end of force snesor 11 is connected with the pressure signal input end of the control system 12, the control system 12
For the aperture for processing the image information and pressure information that are input into and control electrohydraulic servo valve.
The liquid medium outlet of the dynamical system 14 is connected and two with the liquid medium inlet 3-3 of the force application mechanism 3
Electrohydraulic servo valve is installed on the pipeline of person's connection, the supercharging pressure system 13 enters with the pressure medium of the topping up pressing plate 5
Electrohydraulic servo valve is installed on mouth 5-1 connections and the pipeline of the two connection.Preferably, in order to obtain the sheet bulging of better quality
The image information of process, CCD camera 9 selects two, using two CCD cameras 9 through glass plate and the osculum of ladder die 10
Realize the collection that the bulging of thin plate 15 changes.
Control system 12 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 measurement and analysis of object surface appearance, displacement and strain, and obtains
Three dimensional strain field data, intuitive measurement results show.XTDIC systems combine digital image correlation technique (DIC) and binocular solid
Vision technique, by arranging seed point, follows the trail of the speckle image of body surface, realizes the three-dimensional seat of body surface in deformation process
The measurement of mark, displacement and strain., by XTDIC system supports, the universal product is without particular/special requirement for CCD camera.
Such as Fig. 1 explanations, in order to realize being reliably connected for force application mechanism 3 and topping up pressing plate 5, the change of complicated stress environment lower thin sheet
Shape process stress strain gauge means also include pinboard 4, between the output end of the force application mechanism 3 and the topping up pressing plate 5
It is disposed with the pinboard 4 being connected with the two.
Such as Fig. 1 explanations, the force application mechanism 3 is hydraulic jack or hydraulic cylinder.It is so designed that, it is simple and reliable for structure,
It is easy to use.The shape of ladder die 10 can be designed to different shapes so that the stress suffered in deformation of thin plate 15
State is different, realizes different complex strain paths.The tapered hole of ladder die 10 can adopt similar and different cross sectional shape
Combination Design, can be designed as each section mid portion and do not contact with thin plate 15, so as to realize the multistage linear of thin plate 15
Loading, as shown in Figure 7；May be designed in each section mid portion select different transient modes so that thin plate 15 all the time with
Ladder die 10 is contacted, so as to realize Nonlinear loading, as shown in Figure 8.Such as Fig. 5 a explanations, it is preferable that the tapered hole 10-3
Section be made up of multiple elliptic cross-sections of different sizes.
Such as Fig. 1 explanations, on the end face at the big mouth place in the tapered hole of the ladder die 10 circle flanging sealing is fixed with
Muscle 10-2, be machined with the upper surface of topping up pressing plate 5 match with the flanging sealed muscle 10-2 arrange one circle flanging sealing it is recessed
Groove 5-2.It is arranged such, when the bulging of thin plate 15 is tested, thin plate 15 passes through with topping up pressing plate 5 and thin plate 15 with ladder die 10
Flanging sealed muscle 10-2 and flanging sealed groove 5-2 cooperate and realize compression seal.
Such as Fig. 1 explanations, it is preferable that the quantity of the connecting rod 2 is four, and four connecting rods 2 are along the base 1
Circumferentially it is uniformly arranged.It is arranged such, base 1 and the stable connection reliability of upper die plate 6 meet being actually needed for the bulging of thin plate 15.
Such as Fig. 1-Figure 10 explanations, complicated stress environment lower thin sheet deformation process stress-strain measuring method, according to following step
It is rapid to realize：
Step one, empirically need to design and produce corresponding ladder die 10, and thin plate 15 is cut according to requirement of experiment；
Step 2, thin plate 15 is positioned between the upper surface of topping up pressing plate 5 and ladder die 10, in the control of control system 12
System is lower to be passed into liquid medium in dynamical system 14 in force application mechanism 3 by electrohydraulic servo valve, and the output end of force application mechanism 3 is promoted
Topping up pressing plate 5 to ladder die 10 is moved so as to thin plate 15 is compressed into sealing；
Step 3, the control supercharging pressure of control system 12 system 13 are through pressure medium inlet 5-1 to thin plate 15 and topping up
Pressure medium is passed through between pressing plate 5 makes thin plate 15 to the direction bulging of ladder die 10, with the carrying out of bulging, thin plate 15 and ladder
Outer contour shape changes when die 10 is caused 15 bulging of thin plate when contacting by the effect of mould；
The pressure value of pressure medium, CCD camera 9 between step 4, the collection thin plate 15 of pressure sensor 11 and topping up pressing plate 5
The change of speckle when record thin plate 15 deforms；Above- mentioned information is passed to control system 12 and processes by analysis and obtains thin plate 15 swollen
The pressure information of the displacement of various location, stress, strain and pressure medium during shape；
Step 5, the bulging for making the generation of thin plate 15 stable and lasting deform until rupturing, preservation experimental data pulls down experiment
The sheet material for deforming afterwards.
The shape of the ladder die 10 in step 3 is designed to different shapes so that thin plate 15 is suffered in deformation
Stress state is different, realizes the sheet material bulging of different complex strain paths.The tapered hole of ladder die 10 can using different or
The Combination Design of same cross-sectional shape, can be designed as each section mid portion and does not contact with thin plate 15, so as to realize thin plate
15 multistage linear loading, as shown in Figure 7；May be designed in each section mid portion selects different transient modes to cause
Thin plate 15 is contacted all the time with ladder die 10, so as to realize Nonlinear loading, as shown in Figure 8.
Wherein Fig. 5 a are the tapered hole that the tapered hole 10-2 of ladder die 10 is that multiple different elliptic cross-sections are constituted, Fig. 5 b
Schematic diagram is arranged for the elliptical line section that short axle is gradually reduced to Fig. 5 f, Fig. 5 b to Fig. 5 f also illustrate that tapered hole 10-2 by ladder
The precedence diagram that the big mouth of die 10 is arranged to osculum.Fig. 7 is represented in the middle of each section of tapered hole 10-2 of ladder die 10
Part does not contact the sheet material that bulging is obtained with thin plate 15, and Fig. 9 is the multistage linear loading stress road under correspondence Fig. 7 is discontinuously contacted
Footpath schematic diagram；Fig. 8 represents each section of the tapered hole 10-2 of ladder die 10 and continuously contacts what bulging was obtained with thin plate 15
Sheet material, Figure 10 is the Continuous Nonlinear loading stress path schematic diagram under correspondence Fig. 8 is continuously contacted, and the transverse and longitudinal of Fig. 9 and Figure 10 is sat
Mark is stress (horizontal and vertical stress, unit is Mpa).Fig. 6 is the final sheet material obtained using ladder die bulging.Step
Direction when thin plate 15 is placed in two, for anisotropic thin plate 15, adopts same ladder die 10 when placement direction is different
Different stress loading paths can be produced.Pressure medium in step 3 and step 4 is hydraulic oil or emulsion.Using many
The individual ladder die with different cross section shape carries out bulging test, and what acquisition thin plate deformed under the conditions of different complex loadings should
Stress-strain information, thin plate is drawn multiple according to ess-strain information and ess-strain information during rupture of the deformation process for obtaining
Stress forming limit diagram and strain forming limit diagram under miscellaneous loading environment.
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, in the range of without departing from technical solution 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 the technical spirit of the present invention is made to above case study on implementation, still belong to
Technical solution of the present invention scope.
Claims (8)
1. complicated stress environment lower thin sheet deformation process stress-strain measurement device, it is characterised in that：It includes base (1), applies
Force mechanisms (3), topping up pressing plate (5), upper die plate (6), glass plate (8), ladder die (10), pressure sensor (11), control system
System (12), supercharging pressure system (13), dynamical system (14), CCD camera (9), multiple support blocks (7) and multiple connecting rods (2)；
The base (1) is connected by many connecting rods (2) with the upper die plate (6), is added on the ladder die (10)
Work has the tapered hole that aperture is gradually reduced, the end face and the upper die plate at the osculum place in the tapered hole of the ladder die (10)
(6) lower surface is fixedly connected, and on the base (1) below the ladder die (10) force application mechanism (3) is provided with,
The output section of the force application mechanism (3) is fixed with the topping up pressing plate (5), the topping up pressing plate (5) and the ladder die
(10) big opening end in tapered hole is oppositely arranged, and the tapered hole with the ladder die (10) is offered on the upper die plate (6)
Osculum insertion peephole, the upper surface of the upper die plate (6) is provided with multiple support blocks (7), multiple supports
The glass plate (8) is installed on block (7)；The glass plate (8) and the upper die plate (6) are horizontally disposed；
The CCD camera (9), topping up pressing plate (5) upper surface and institute are disposed with directly over the peephole of the upper die plate (6)
Sealing arrangement has thin plate (15) to be measured, the thin plate between the end face at the big mouth place for stating the tapered hole of ladder die (10)
(15) plate face that the speckle (16) of random distribution is coated with is arranged towards CCD camera (9), the liquid of the dynamical system (14)
Body media outlet is connected with the liquid medium inlet (3-3) of the force application mechanism (3), the supercharging pressure system (13) with it is described
Topping up pressing plate (5) pressure medium inlet (5-1) connection, be provided with the outlet conduit of the supercharging pressure system (13) for
The pressure sensor (11) of detection outlet pressure medium, the image signal output end and the control system of the CCD camera (9)
(12) picture signal input connection, signal output end and the control system (12) of the pressure sensor (11)
Pressure signal input end connection, the control system (12) for process input image information and pressure information.
2. complicated stress environment lower thin sheet deformation process stress-strain measurement device according to claim 1, it is characterised in that：
The complicated stress environment lower thin sheet deformation process stress-strain measurement device also includes pinboard (4), the force application mechanism (3)
Output section and the topping up pressing plate (5) between be disposed with the pinboard (4) being connected with the two.
3. complicated stress environment lower thin sheet deformation process stress-strain measurement device according to claim 1 or claim 2, its feature exists
In：The force application mechanism (3) is hydraulic jack or hydraulic cylinder.
4. complicated stress environment lower thin sheet deformation process stress-strain measurement device according to claim 3, it is characterised in that：
The section of the tapered hole (10-3) is made up of multiple elliptic cross-sections of different sizes.
5. complicated stress environment lower thin sheet deformation process stress-strain measurement device, its feature according to claim 1,2 or 4
It is：Circle flanging sealed muscle (10-2) is fixed with the end face that the big mouth in the tapered hole of the ladder die (10) is located, is filled
It is machined with the upper surface of hydraulic plate (5) and the circle flanging sealed groove (5- for arranging is matched with the flanging sealed muscle (10-2)
2)。
6. complicated stress environment lower thin sheet deformation process stress-strain measurement device according to claim 5, it is characterised in that：
The quantity of the connecting rod (2) is four, and four connecting rods (2) are uniformly arranged along the circumference of the base (1).
7. complicated stress environment lower thin sheet deformation process stress-strain measuring method, it is characterised in that：
Step one, empirically need to design and produce corresponding ladder die (10), and according to requirement of experiment cutting thin plate (15)；
Step 2, thin plate is positioned between topping up pressing plate (5) upper surface and ladder die (10), in the control of control system (12)
System is lower to be passed into liquid medium in dynamical system (14) in force application mechanism (3) by electrohydraulic servo valve, force application mechanism (3) output
Portion promotes topping up pressing plate (5) to move to ladder die (10) and seals so as to thin plate (15) be compressed；
Step 3, control system (12) control supercharging pressure system (13) through pressure medium inlet (5-1) to thin plate (15) and
Pressure medium is passed through between topping up pressing plate (5) makes thin plate (15) to ladder die (10) direction bulging, thin with the carrying out of bulging
When plate (15) is contacted with ladder die (10) by mould effect so that outer contour shape changes during thin plate (15) bulging；
The pressure value of pressure medium, CCD phases between step 4, pressure sensor (11) collection thin plate (15) and topping up pressing plate (5)
The change of speckle when machine (9) record thin plate (15) deforms；Above- mentioned information is passed to control system (12) and processes by analysis and obtains
Pressure information of the thin plate (15) in the displacement of various location, stress, strain and pressure medium；
Step 5, the bulging for making thin plate (15) generation stable and lasting deform until rupturing, preservation experimental data, after pulling down experiment
The sheet material of deformation.
8. complicated stress environment lower thin sheet deformation process stress-strain measuring method according to claim 7, it is characterised in that：
Step 2 borrows the pressure arranged on the flanging sealed muscle (10-2) and the topping up pressing plate (5) arranged on the ladder die (10)
Thin plate (15) is pushed down and sealed by side sealed groove (5-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611240021.6A CN106644730B (en) | 2016-12-28 | 2016-12-28 | Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611240021.6A CN106644730B (en) | 2016-12-28 | 2016-12-28 | Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106644730A true CN106644730A (en) | 2017-05-10 |
| CN106644730B CN106644730B (en) | 2019-04-12 |
Family
ID=58836261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611240021.6A Active CN106644730B (en) | 2016-12-28 | 2016-12-28 | Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106644730B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607400A (en) * | 2017-09-19 | 2018-01-19 | 福州大学 | Rubber type of material biaxial tension-compression strength machine |
| CN110553917A (en) * | 2019-09-11 | 2019-12-10 | 北京东方雨虹防水技术股份有限公司 | Test system and test method for multidirectional stretching of waterproof material |
| WO2022181401A1 (en) * | 2021-02-25 | 2022-09-01 | 国立大学法人東京農工大学 | Stress test device, material model identification processing device, material model identification processing network system, material model identification processing method, and material model identification processing program |
| CN115547436A (en) * | 2022-11-25 | 2022-12-30 | 哈尔滨工业大学 | Method and device for determining bulging limit strain of plate viscous medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000009274A1 (en) * | 1998-08-17 | 2000-02-24 | United States Automotive Materials Partnership | Hybrid matched tool-electromagnetic forming apparatus incorporating electromagnetic actuator, methods of use and article made therefrom |
| WO2008084920A1 (en) * | 2007-01-08 | 2008-07-17 | Pusan National University Industryuniversity Cooperation Foundation | Curved surface forming method of a metal plate |
| CN102607969A (en) * | 2012-03-20 | 2012-07-25 | 哈尔滨工业大学 | Device and method for testing forming limit of sheet material in three-dimensional stress state |
| CN103528898A (en) * | 2013-11-01 | 2014-01-22 | 哈尔滨工业大学 | Plate forming performance testing device and method in three-dimensional stress state |
| CN104048879A (en) * | 2014-07-02 | 2014-09-17 | 南京力淮软件科技有限公司 | Full-automatic three-axis testing system for saturated soil stress path |
| CN105181404A (en) * | 2015-07-09 | 2015-12-23 | 中国科学院寒区旱区环境与工程研究所 | Frozen clay hollow cylinder sample preparation device |
| 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 CN201611240021.6A patent/CN106644730B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000009274A1 (en) * | 1998-08-17 | 2000-02-24 | United States Automotive Materials Partnership | Hybrid matched tool-electromagnetic forming apparatus incorporating electromagnetic actuator, methods of use and article made therefrom |
| WO2008084920A1 (en) * | 2007-01-08 | 2008-07-17 | Pusan National University Industryuniversity Cooperation Foundation | Curved surface forming method of a metal plate |
| CN102607969A (en) * | 2012-03-20 | 2012-07-25 | 哈尔滨工业大学 | Device and method for testing forming limit of sheet material in three-dimensional stress state |
| CN103528898A (en) * | 2013-11-01 | 2014-01-22 | 哈尔滨工业大学 | Plate forming performance testing device and method in three-dimensional stress state |
| CN104048879A (en) * | 2014-07-02 | 2014-09-17 | 南京力淮软件科技有限公司 | Full-automatic three-axis testing system for saturated soil stress path |
| CN105181404A (en) * | 2015-07-09 | 2015-12-23 | 中国科学院寒区旱区环境与工程研究所 | Frozen clay hollow cylinder sample preparation device |
| 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 |
|---|---|---|---|---|
| CN107607400A (en) * | 2017-09-19 | 2018-01-19 | 福州大学 | Rubber type of material biaxial tension-compression strength machine |
| CN110553917A (en) * | 2019-09-11 | 2019-12-10 | 北京东方雨虹防水技术股份有限公司 | Test system and test method for multidirectional stretching of waterproof material |
| CN110553917B (en) * | 2019-09-11 | 2022-03-18 | 北京东方雨虹防水技术股份有限公司 | Test system and test method for multidirectional stretching of waterproof material |
| WO2022181401A1 (en) * | 2021-02-25 | 2022-09-01 | 国立大学法人東京農工大学 | Stress test device, material model identification processing device, material model identification processing network system, material model identification processing method, and material model identification processing program |
| CN115547436A (en) * | 2022-11-25 | 2022-12-30 | 哈尔滨工业大学 | Method and device for determining bulging limit strain of plate viscous medium |
| CN115547436B (en) * | 2022-11-25 | 2023-03-10 | 哈尔滨工业大学 | Method and device for determining bulging limit strain of plate viscous medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106644730B (en) | 2019-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106644730A (en) | Stress-strain measuring device and method for thin-plate transformation process under complex stress path | |
| CN105300802B (en) | A kind of light-wall pipe two-dimensional state of stress stress-strain measurement device and method | |
| CN103558087B (en) | Tube wall plane indentation residual thickness bulging device and method for tube mechanical property test | |
| CN109870362B (en) | Method and system for establishing fracture forming limit diagram of high-strength aluminum alloy plate | |
| CN107971382B (en) | A kind of device and method can be used for panel stiffness mould bulging and hydraulic bulge test | |
| CN102607969B (en) | Device and method for testing forming limit of sheet material in three-dimensional stress state | |
| CN102353598B (en) | Composite strain path forming test device | |
| CN109284515A (en) | Method is determined based on the light sheet material Plastic Forming limit of finite element method (fem) analysis | |
| Dilmec et al. | Effect of geometrical and process parameters on coefficient of friction in deep drawing process at the flange and the radius regions | |
| CN109637598A (en) | A kind of material mechanical parameters based on bending process determine method | |
| CN102410957A (en) | Test sample and method for testing performance parameters of pipe under complex stress state | |
| Guo et al. | Experimental and numerical investigation of bulging behaviour of hyperelastic textured tubes | |
| CN102866064A (en) | Tube bulging forming limit test device and method under bi-directional pressurization condition | |
| CN105806709B (en) | Method and equipment for testing performance of pipe | |
| CN110220781A (en) | A kind of plate anisotropy constitutive parameter scaling method and system | |
| Mostafapur et al. | Numerical and experimental investigation of pulsating blankholder effect on drawing of cylindrical part of aluminum alloy in deep drawing process | |
| CN106840922A (en) | A kind of method of tubing forming property under test complex strain paths | |
| Fatemi et al. | Influences of inner pressure and tube thickness on process responses of hydroforming copper tubes without axial force | |
| WO2017076343A1 (en) | Biaxial testing system to examine the kinetic behavior of particulate media | |
| CN105953968A (en) | Novel superhigh pressure sensor and pressure detection method | |
| CN103528898A (en) | Plate forming performance testing device and method in three-dimensional stress state | |
| JP7111085B2 (en) | Press molding simulation method | |
| Roşca et al. | Simulation of the Single Point Incremental Forming of Polyamide and Polyethylene Sheets | |
| CN206725345U (en) | A kind of metal material mechanics device for detecting performance based on pressure forming | |
| CN101912890A (en) | Method for establishing constitutive relation model of material during extrusion deformation of pipe |
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: Zhu Haihui Inventor after: Zhang Kun Inventor after: Yuan Shijian Inventor before: He Zhubin Inventor before: Zhang Kun Inventor before: Yuan Shijian |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |