CN106644730B - Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method - Google Patents
Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method Download PDFInfo
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- G01N2203/0075—Strain-stress relations or elastic constants
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- 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
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Abstract
Complicated stress environment lower thin sheet deformation process stress-strain measurement device and method, the stress of plate whole deformation process under general pahtfinder hard loading environment can not be obtained to solve existing experimental rig and method, strain data, thus can not be accurate, the problem of describing deformation characteristic of the material under complicated stress environment comprehensively, complicated stress environment lower thin sheet deformation process stress-strain measurement device includes pedestal, force application mechanism, filling liquid pressing plate, cope plate, glass plate, ladder cavity plate, pressure sensor, control system, supercharging pressure system, dynamical system, CCD camera, multiple supporting blocks and multiple connecting rods；Measurement method step: Step 1: production ladder cavity plate and cutting thin plate；Step 2: assembling filling liquid；Step 3: plate bulging；Step 4: ess-strain information collection；Step 5: provision for disengagement saves experimental data.The present invention is used for stress-strain test of the thin plate under complicated stress environment.
Description
Technical field
The present invention relates to thin-wall boards deformation process stress-strain measurement device and methods, and in particular to complicated stress environment
Lower thin sheet deformation process stress-strain measurement device and method.
Background technique
Requirement with new- and high-tech weaponry to high reliability and long-life, there is an urgent need to replace tradition using integrated member
Welding package assembly.For the forming for realizing such complex thin-wall integrated member, the complicated deformation process of experience, plate are generally required
The change of blank shape, size and boundary condition results in stress path and changes in material deformation process, and load path is presented
It is non-linear out.
Actual thin-wall boards all have a 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 as far as possible close to practical molding condition
Data, to realize to the accurate description of sheet properties and characterization.In the past, mainly using simple tension, circular die bulging or
The methods of oval mold bulging carrys out test material performance.But can only all to obtain certain changeless for these above-mentioned methods
Material deformation data under stress state, i.e., the stress axis of both direction is kept constant in deformation process in plate plane.
For example, what is obtained when simple tension is uniaxial stress state, the acquisition of circular die bulging is two-way equal tensile stress states, oval
What shape mold bulging obtained is the biaxial tension stress state that both direction stress value does not wait.These load paths are referred to as simple
Load or proportional loading.
In recent years, there is plate biaxial tension experimental method and dedicated biaxial tension test macro.Using special design
Cruciform specimen, by adjusting with two mutually perpendicular directions of control drawing force and tensile speed can realize the two-way of sample
Loading experiment.By the power of testing machine, displacement and strain measurement system, the stress of material, strain in available deformation process
Etc. data.Currently, cross sample biaxial tension experiment has been widely used for the mechanical property of test plate.For theoretically, adopt
Material can also be made to deform under the conditions of certain non-proportion loading with cross sample biaxial tension experiment, i.e., two in deformation process
Corresponding change occurs for the stress axis of a orthogonal directions.But since the shape of cross sample in drawing process will be with
The progress 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, deformation is highly unstable or uncontrollable, therefore also can not just obtain subsequent stress, strain etc. again
Test data.This is insufficient, seriously limits the application of cross sample biaxial tension experimental method, especially this method can not be used
In obtaining the material stress of the unsteady deformation of phase and ultimate failure failure stage, strain information after the test.
As described above, the apparent plate of practical thin-wall boards especially anisotropy will be shown under the conditions of complex loading
Entirely different deformational behavior.But the whether experiment of one way tensile test, circle/ellipse mold bulging or plate ten
Word sample biaxial tension experiment, 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 can not be all obtained
Data, so that deformation characteristic of the material under complicated stress environment can not be described accurately, comprehensively.
Therefore, it is necessary to establish to can be realized the condition of complex strain paths and obtain the ess-strain in deformation process to believe
Breath, to carry out accurate description to deformational behavior of plate under the conditions of complex loading.
Summary of the invention
The present invention is to solve existing experimental rig and method and can not obtain plate in general pahtfinder hard loading environment
Stress, the strain data of lower whole deformation process, so that it is special to describe deformation of the material under complicated stress environment accurately, comprehensively
The problem of property, and then a kind of complicated stress environment lower thin sheet deformation process stress-strain measurement device and method is provided.
The present invention is in order to realize that above-mentioned technical problem adopts the technical scheme that:
Complicated stress environment lower thin sheet deformation process stress-strain measurement device include pedestal, force application mechanism, filling liquid pressing plate,
It is cope plate, glass plate, ladder cavity plate, pressure sensor, control system, supercharging pressure system, dynamical system, CCD camera, multiple
Supporting block and multiple connecting rods；
The pedestal is connect by the more connecting rods with the cope plate, be machined on the ladder cavity plate aperture by
Decrescence small tapered hole, the lower surface of end face and the cope plate where the osculum in the tapered hole of the ladder cavity plate is fixed to be connected
It connects, force application mechanism is installed on the pedestal below the ladder cavity plate, the output end of the force application mechanism is fixed with
The filling liquid pressing plate, the filling liquid pressing plate and the big opening end in the tapered hole of the ladder cavity plate are oppositely arranged, on the cope plate
The peephole with the perforation of the osculum in the tapered hole of the ladder cavity plate is offered, the upper surface of the cope plate is equipped with multiple institutes
Supporting block is stated, the glass plate is installed in multiple supporting blocks；The glass plate and the cope plate are horizontally disposed；
The CCD camera, filling liquid pressing plate upper surface and the rank are disposed with right above the peephole of the cope plate
Sealing arrangement has thin plate to be measured between end face where the big mouth in the tapered hole of terraced cavity plate, and random point is coated on the thin plate
One plate face of the speckle of cloth is arranged towards CCD camera, the liquid of the liquid medium outlet and the force application mechanism of the dynamical system
The connection of body medium inlet, the supercharging pressure system are connected to the pressure medium inlet of the filling liquid pressing plate, the supercharging pressure
Pressure sensor for detecting outlet pressure medium, the picture signal of the CCD camera are installed on the outlet conduit of system
Output end is connect with the picture signal input terminal of the control system, the signal output end of the pressure sensor with it is described
The pressure signal input end of control system connects, and the control system is used to handle the image information and pressure information of input.
Complicated stress environment lower thin sheet deformation process stress-strain measuring method is realized according to the following steps:
Step 1: needing to design and produce corresponding ladder cavity plate by experiment, and thin plate is cut according to requirement of experiment；
Step 2: thin plate is placed between filling liquid pressing plate upper surface and ladder cavity plate, lead under control of the control system
Cross electrohydraulic servo valve liquid medium in dynamical system is passed into force application mechanism, force application mechanism output end push filling liquid pressing plate to
The movement of ladder cavity plate seals to compress thin plate；
Step 3: control system control supercharging pressure system is led to by pressure medium inlet between thin plate and filling liquid pressing plate
Entering pressure medium makes thin plate to ladder cavity plate direction bulging, with the progress of bulging, by mould when thin plate and ladder cavity plate contact
The effect of tool is so that outer contour shape changes when sheet bulging；
Step 4: pressure sensor acquires the pressure value of pressure medium between thin plate and filling liquid pressing plate, CCD camera register
The variation of speckle when plate deforms；Above- mentioned information, which are passed to control system and handle by analysis, obtains the position of thin plate at different locations
Shifting, stress, strain and pressure medium pressure information；
Step 5: making thin plate that stable and lasting bulging deformation occur until rupture, saves experimental data, after removing experiment
The plate of deformation.
It is recessed by ladder in Bulging Process the beneficial effects of the present invention are: one, ladder cavity plate bulging method proposed by the present invention
Plate when mould is to bulging is constrained so that plate stress state of apex in Bulging Process changes, to realize
Plate deforms under complex strain paths, obtains corresponding stress-strain data for theoretical research.Realization process is more
Simply, special equipment is not needed, it is simple and easy.
Two, different complex strain paths can be realized by changing the cross sectional shape of ladder cavity plate, without carrying out journey
Sequence control, therefore loading procedure is simple and continuous, stablizes, the stress-strain data of overall process can complete, precise measurement.
Three, the present invention is formed by connecting the major architectural of device using pedestal, connecting rod and cope plate, and structure is simple and tight
It gathers；Sealed pressure is provided using single driving unit, simply and convenient for operation.
Four, stress value can be calculated by calculation formula in plate Bulging Process, be joined involved in calculation formula
Number can handle to obtain by CCD camera precise measurement and by control system, and results of stress is accurate；Strain value is to pass through
CCD camera measurement handles to obtain via control system, and strain measurement result is accurate；Therefore plate more can be accurately obtained to exist
Ess-strain information when being deformed under complex stress condition.
Five, strain measurement is obtained by spraying speckle on plate and then being measured by CCD camera and pass through processing, is not necessarily to
Paste foil gauge or reliable using tools, easy to operate and measurement results such as spherometers.
Six, sample preparation is simple, it is only necessary to which sizeable circular specimen is made in plate.
Detailed description of the invention
Fig. 1 is complicated stress environment lower thin sheet deformation process stress-strain measurement schematic device, and Fig. 2 is using CCD phase
The schematic diagram that machine measures sheet deformation process, Fig. 3 are that conventional elliptical openings cavity plate realizes plate bulging schematic diagram, figure
4 analyze schematic diagram to obtain plate outer contour shape after bulging, and Fig. 5 a is the ladder cavity plate schematic diagram with tapered hole, and Fig. 5 b is
Close to circular schematic shapes, Fig. 5 c is that the short axle of ladder cavity plate oval cross section is less than figure for ladder cavity plate cross section
The schematic shapes of the radius of 5b circular cross-section, Fig. 5 d are that the short axle of ladder cavity plate oval cross section is less than the ellipse of Fig. 5 c
The schematic shapes of the short axle of shape cross section, Fig. 5 e are that the short axle of ladder cavity plate oval cross section is less than the ellipse of Fig. 5 d
The schematic shapes of the short axle of cross section, Fig. 5 f are that the short axle of ladder cavity plate oval cross section is horizontal less than the ellipse of Fig. 5 e
The schematic shapes of the short axle in section, Fig. 6 are using the plate schematic diagram after ladder cavity plate bulging, and Fig. 7 is in each section of section
Between part not with the ladder cavity plate schematic diagram of sheet contacts, Fig. 8 be each section of section continuous and derivable transition and the rank with sheet contacts
Terraced cavity plate schematic diagram, Fig. 9 are 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 pedestal, and 2 be connecting rod, and 3 be force application mechanism, and 3-3 is force application mechanism liquid medium inlet, and 4 be switching
Plate, 5 be filling liquid pressing plate, and 5-1 is pressure medium inlet, and 5-2 is flanging sealed groove, 6 is cope plate, and 7 be supporting block, and 8 be glass
Glass plate, 9 be CCD camera, and 10 be ladder cavity plate, and 10-1 is conventional ellipse opening cavity plate, 10-2 is flanging sealing bar, 11 is pressure
Force snesor, 12 be control system, and 13 be supercharging pressure system, and 14 be dynamical system, and 15 thin plates, 16 be speckle.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
The present invention is in order to realize that technical principle used by complex strain paths is expressed as follows:
By the stress balance of the corresponding minute cells body of pole on ellipsoid in Fig. 3 and Fig. 4 or the vertex place K, can be obtained
Following formula:
2Ryδytσxsin(δx/2)+2RxδxtσySin (δ y/2)=p (Rxδx)(Ryδy) (1)
Wherein, δ x, δ y are length on the corresponding direction minute cells body x, y in pole (vertex) place K, and t is by corresponding at K
Minute cells body thickness, Rx、RyAlong two principal radiuses of curvature of x-axis and y-axis direction at respectively pole (vertex) K, p is plate
Plate pressure when material bulging.
Through simple change, (1) becomes 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 vertex, apart from certain that point distance is h
The section that plate when one plane and bulging is crossed to form is ellipse, and length half shaft length is denoted as a, b, then:
Rx=(a2+h2)/2h (3)
Ry=(b2+h2)/2h (4)
In conjunction with the stress expression formula in formula (2) (3) (4) available both direction:
Wherein, α=σx/σy。
According to constancy of volume it is assumed that at available vertex P wall thickness expression formula:
The strain of both directionProcessing in control system is input to after can measuring by CCD camera to obtain.
Expanding die recited above opening is oval and only single shape, and plate is suffered two in Bulging Process
The stress axis in a direction is certain value.If mold to be processed into the form of ladder cavity plate shown in fig. 5, ladder cavity plate is in difference
There is different cross sectional shapes, plate can constantly recline with mold when bulging occurs for plate, and mould constraint plate is swollen at position
Shape when shape, then Rx、RyIt will change, thus stress state when changing plate bulging at the K of vertex.With Bulging Process
R at middle vertex Kx、RyContinuous variation, thin plate can be made to deform under continually changing stress state, that is, realize complicated stress
Path/load path.
It is illustrated with reference to Fig. 1, complicated stress environment lower thin sheet deformation process stress-strain measurement device includes pedestal 1, force
Mechanism 3, filling liquid pressing plate 5, cope plate 6, glass plate 8, ladder cavity plate 10, pressure sensor 11, control system 12, supercharging pressure system
System 13, dynamical system 14, CCD camera 9, multiple supporting blocks 7 and multiple connecting rods 2；
The pedestal 1 is connect by the more connecting rods 2 with the cope plate 6, is machined on the ladder cavity plate 10
Under the tapered hole that aperture is gradually reduced, end face where the osculum in the tapered hole of the ladder cavity plate 10 and the cope plate 6
Surface is fixedly connected, and is equipped with force application mechanism 3, the force application mechanism 3 on the pedestal 1 of 10 lower section of ladder cavity plate
Output end be fixed with the filling liquid pressing plate 5, the filling liquid pressing plate 5 is opposite with the big opening end in tapered hole of the ladder cavity plate 10
It is arranged, the peephole with the perforation of the osculum in the tapered hole of the ladder cavity plate 10, the cope plate is offered on the cope plate 6
6 upper surface is equipped with multiple supporting blocks 7, is equipped with the glass plate 8 in multiple supporting blocks 7；The glass plate 8
It is horizontally disposed with the cope plate 6；
It is disposed with the CCD camera 9 right above the peephole of the cope plate 6,5 upper surface of filling liquid pressing plate and described
Sealing arrangement has thin plate 15 to be measured between end face where the big mouth in the tapered hole of ladder cavity plate 10, sprays on the thin plate 15
There is a plate face of the speckle 16 of random distribution to be arranged towards CCD camera 9, the liquid medium of the dynamical system 14 outlet and described
The liquid medium inlet 3-3 of force application mechanism 3 is connected to, and the supercharging pressure system 13 and the pressure medium of the filling liquid pressing plate 5 enter
Mouth 5-1 is connected to, and the pressure sensing for detecting outlet pressure medium is equipped on the outlet conduit of the supercharging pressure system 13
Device 11, the image signal output end of the CCD camera 9 are connect with the picture signal input terminal of the control system 12, the pressure
The signal output end of force snesor 11 is connect with the pressure signal input end of the control system 12, the control system 12
For handling the image information inputted and pressure information and the aperture for controlling electrohydraulic servo valve.
The liquid medium outlet of the dynamical system 14 is connected to 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 and the pressure medium of the filling liquid pressing plate 5 enter
Electrohydraulic servo valve is installed on the pipeline of mouth 5-1 connection and the two connection.Preferably, in order to obtain the sheet bulging of better quality
The image information of process, CCD camera 9 select two, using two CCD cameras 9 through glass plate and the osculum of ladder cavity plate 10
Realize the acquisition of 15 bulging of thin plate variation.
Control system 12 preferentially selects the XTDIC three-dimensional optical speckle system of Xi'an Communications University.XTDIC system is a kind of
Optical non-contact measurement system for three-dimensional deformation for object surface appearance, displacement and the measurement of strain and analysis, and obtains
Three dimensional strain field data, intuitive measurement results are shown.XTDIC system combination digital image correlation technique (DIC) and binocular solid
Vision technique tracks the speckle image of body surface, realizes that the three-dimensional of body surface is sat in deformation process by the way that seed point is arranged
The measurement of mark, displacement and strain.CCD camera is by XTDIC system support, and the universal product is without particular/special requirement.
If Fig. 1 illustrates, in order to realize being reliably connected for force application mechanism 3 and filling liquid pressing plate 5, complicated stress environment lower thin sheet becomes
Shape process stress strain gauge means further include pinboard 4, between the output end of the force application mechanism 3 and the filling liquid pressing plate 5
It is disposed with the pinboard 4 connecting with the two.
If Fig. 1 illustrates, the force application mechanism 3 is hydraulic jack or hydraulic cylinder.It is designed in this way, it is simple and reliable for structure,
It is easy to use.The shape of ladder cavity plate 10 can be designed to different shapes so that the suffered stress in deformation of thin plate 15
State is different, realizes different complex strain paths.The tapered hole of ladder cavity plate 10 can use similar and different cross sectional shape
Combination Design, can be designed as each section middle section and do not contacted with thin plate 15, to realize the multistage linear of thin plate 15
Load, as shown in Figure 7；May be designed in each section middle section select different transient modes make thin plate 15 always with
Ladder die 10 contacts, to realize Nonlinear loading, as shown in Figure 8.Such as Fig. 5 a explanation, it is preferable that the tapered hole 10-3
Section be made of multiple elliptic cross-sections of different sizes.
If Fig. 1 illustrates, circle flanging sealing is fixed on the end face where the big mouth in the tapered hole of the ladder cavity plate 10
Muscle 10-2, be machined on the upper surface of filling liquid pressing plate 5 matched with the flanging sealing bar 10-2 setting a circle flanging sealing it is recessed
Slot 5-2.So set, thin plate 15 passes through with filling liquid pressing plate 5 and thin plate 15 with ladder cavity plate 10 in the experiment of 15 bulging of thin plate
Flanging sealing bar 10-2 and flanging sealed groove 5-2, which cooperates, realizes compression seal.
As Fig. 1 illustrates, it is preferable that the quantity of the connecting rod 2 is four, and four connecting rods 2 are along the pedestal 1
Circumferentially it is uniformly arranged.So set, pedestal 1 and 6 stable connection of cope plate are reliable, meet the actual needs of 15 bulging of thin plate.
If Fig. 1-Figure 10 illustrates, complicated stress environment lower thin sheet deformation process stress-strain measuring method, according to following step
It is rapid to realize:
Step 1: needing to design and produce corresponding ladder cavity plate 10 by experiment, and thin plate 15 is cut according to requirement of experiment；
Step 2: thin plate 15 is placed between 5 upper surface of filling liquid pressing plate and ladder cavity plate 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 3 output end of force application mechanism pushes
Filling liquid pressing plate 5 moves to compress thin plate 15 and seal to ladder cavity plate 10；
Step 3: control system 12, which controls supercharging pressure system 13, passes through pressure medium inlet 5-1 to thin plate 15 and filling liquid
Pressure medium is passed through between pressing plate 5 makes thin plate 15 to 10 direction bulging of ladder cavity plate, with the progress of bulging, thin plate 15 and ladder
By the effect of mold so that outer contour shape changes when 15 bulging of thin plate when cavity plate 10 contacts；
Step 4: pressure sensor 11 acquires the pressure value of pressure medium between thin plate 15 and filling liquid pressing plate 5, CCD camera 9
Record the variation of speckle when thin plate 15 deforms；Above- mentioned information, which are passed to control system 12 and handle by analysis, obtains thin plate 15 swollen
The pressure information of displacement, stress, strain and pressure medium during shape at different location；
Step 5: making thin plate 15 that stable and lasting bulging deformation occur until rupture, saves experimental data, remove experiment
The plate deformed afterwards.
The shape of ladder cavity plate 10 in step 3 is designed to different shapes to keep thin plate 15 suffered in deformation
Stress state is different, realizes the plate bulging of different complex strain paths.The tapered hole of ladder cavity plate 10 can using different or
The Combination Design of same cross-sectional shape can be designed as each section middle section and not contact with thin plate 15, to realize thin plate
15 multistage linear load, as shown in Figure 7；May be designed in each section middle section selects different transient modes to make
Thin plate 15 is contacted with ladder die 10 always, to realize Nonlinear loading, as shown in Figure 8.
It is the tapered hole that multiple and different elliptic cross-sections are constituted, Fig. 5 b that wherein Fig. 5 a, which is the tapered hole 10-2 of ladder cavity plate 10,
It is the elliptical line section arrangement schematic diagram that short axle is gradually reduced to Fig. 5 f, Fig. 5 b to Fig. 5 f also illustrates that tapered hole 10-2 by ladder
The precedence diagram that the big mouth of cavity plate 10 is arranged to osculum.Fig. 7 is represented among each section of tapered hole 10-2 of ladder cavity plate 10
Part does not contact the plate that bulging obtains with thin plate 15, and Fig. 9 is the multistage linear loading stress road under corresponding diagram 7 discontinuously contacts
Diameter schematic diagram；Each section that Fig. 8 represents the tapered hole 10-2 of ladder cavity plate 10 continuously contacts what bulging obtained with thin plate 15
Plate, Figure 10 are the Continuous Nonlinear loading stress path schematic diagram under corresponding diagram 8 continuously contacts with, the transverse and longitudinal seat of Fig. 9 and Figure 10
Mark is stress (horizontal and vertical stress, unit Mpa).Fig. 6 is the final plate obtained using ladder cavity plate bulging.Step
Direction when thin plate 15 is placed in two, for anisotropic thin plate 15, placement direction does not use same ladder cavity plate 10 simultaneously
It can produce different stress loading paths.Pressure medium in step 3 and step 4 is hydraulic oil or emulsion.Using more
A ladder cavity plate with different cross section shape carries out bulging test, and what acquisition thin plate deformed under the conditions of different complex loadings answers
Stress-strain information, ess-strain information when according to the ess-strain information of the deformation process of acquisition and rupture draw thin plate multiple
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, and however, it is not intended to limit the invention, any to be familiar with this profession
Technical staff, without departing from the scope of the present invention, when the structure and technology contents that can use the disclosure above are done
A little change or it is modified to the equivalence enforcement case of equivalent variations out, but it is all without departing from technical solution of the present invention
Hold, any simple modification, equivalent change and modification done according to the technical essence of the invention to the above case study on implementation still belong to
Technical solution of the present invention range.
Claims (7)
1. complicated stress environment lower thin sheet deformation process stress-strain measurement device, it is characterised in that: it includes pedestal (1), applies
Force mechanisms (3), filling liquid pressing plate (5), cope plate (6), glass plate (8), ladder cavity plate (10), pressure sensor (11), control system
System (12), supercharging pressure system (13), dynamical system (14), CCD camera (9), multiple supporting blocks (7) and multiple connecting rods (2)；
The pedestal (1) is connect by the more connecting rods (2) with the cope plate (6), is added on the ladder cavity plate (10)
Work has the tapered hole that aperture is gradually reduced, and the section of the tapered hole (10-3) is by multiple elliptic cross-section structures of different sizes
At the end face where the osculum in the tapered hole of the ladder cavity plate (10) is fixedly connected with the lower surface of the cope plate (6), position
It is equipped with force application mechanism (3) on the pedestal (1) below the ladder cavity plate (10), the output of the force application mechanism (3)
Portion is fixed with the filling liquid pressing plate (5), and the filling liquid pressing plate (5) is opposite with the big opening end in tapered hole of the ladder cavity plate (10)
Setting, offers the peephole with the perforation of the osculum in the tapered hole of the ladder cavity plate (10) on the cope plate (6), it is described on
The upper surface of template (6) is equipped with multiple supporting blocks (7), is equipped with the glass plate on multiple supporting blocks (7)
(8)；The glass plate (8) and the cope plate (6) are horizontally disposed；
It is disposed with the CCD camera (9) right above the peephole of the cope plate (6), filling liquid pressing plate (5) upper surface and institute
Stating sealing arrangement between the end face where the big mouth in the tapered hole of ladder cavity plate (10) has thin plate to be measured (15), the thin plate
(15) plate face that the speckle (16) of random distribution is coated on is arranged towards CCD camera (9), the liquid of the dynamical system (14)
Body media outlet is connected to the liquid medium inlet (3-3) of the force application mechanism (3), the supercharging pressure system (13) with it is described
The pressure medium inlet (5-1) of filling liquid pressing plate (5) is connected to, and is equipped with and is used on the outlet conduit of the supercharging pressure system (13)
The pressure sensor (11) of detection outlet pressure medium, the image signal output end of the CCD camera (9) and the control system
(12) picture signal input terminal connection, signal output end and the control system (12) of the pressure sensor (11)
Pressure signal input end connection, the control system (12) be used for handle 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 further includes pinboard (4), the force application mechanism (3)
Output section and the filling liquid pressing plate (5) between be disposed with both the pinboard (4) that connect.
3. complicated stress environment lower thin sheet deformation process stress-strain measurement device according to claim 1 or claim 2, feature exist
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 1 or claim 2, feature exist
In: a circle flanging sealing bar (10-2), filling liquid are fixed on the end face where the big mouth in the tapered hole of the ladder cavity plate (10)
Circle flanging sealed groove (5-2) that setting is matched with the flanging sealing bar (10-2) is machined on the upper surface of pressing plate (5).
5. complicated stress environment lower thin sheet deformation process stress-strain measurement device according to claim 4, it is characterised in that:
The quantity of the connecting rod (2) is four, and four connecting rods (2) are uniformly arranged along the circumferential direction of the pedestal (1).
6. a kind of complicated stress environment lower thin sheet deformation process stress-strain measuring method based on claim 1 described device,
It is characterized by:
Step 1: needing to design and produce corresponding ladder cavity plate (10) by experiment, and thin plate (15) are cut according to requirement of experiment；
Step 2: thin plate is placed between filling liquid pressing plate (5) upper surface and ladder cavity plate (10), the control in 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 pushes filling liquid pressing plate (5) to move to compress thin plate (15) and seal to ladder cavity plate (10)；
Step 3: control system (12) control supercharging pressure system (13) by pressure medium inlet (5-1) to thin plate (15) and
Pressure medium is passed through between filling liquid pressing plate (5) makes thin plate (15) to ladder cavity plate (10) direction bulging, thin with the progress of bulging
By the effect of mold so that outer contour shape changes when thin plate (15) bulging when plate (15) and ladder cavity plate (10) contact；
Step 4: pressure sensor (11) acquires the pressure value of pressure medium between thin plate (15) and filling liquid pressing plate (5), CCD phase
The variation of speckle when machine (9) records thin plate (15) deformation；Above- mentioned information, which are passed to control system (12) and handle by analysis, to be obtained
Thin plate (15) displacement at different locations, stress, strain and pressure medium pressure information；
Step 5: making thin plate (15) that stable and lasting bulging deformation occurs until rupture, saves experimental data, after removing experiment
The plate of deformation.
7. complicated stress environment lower thin sheet deformation process stress-strain measuring method according to claim 6, it is characterised in that:
The pressure that step 2 borrows the flanging sealing bar (10-2) being arranged on the ladder cavity plate (10) and is arranged on the filling liquid pressing plate (5)
Thin plate (15) is pushed down and is sealed by side sealed groove (5-2).
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| CN107607400A (en) * | 2017-09-19 | 2018-01-19 | 福州大学 | Rubber type of material biaxial tension-compression strength machine |
| 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 |
| 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 |
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