CN110514523A - A kind of stress loading combination unit - Google Patents
A kind of stress loading combination unit Download PDFInfo
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- CN110514523A CN110514523A CN201910809908.XA CN201910809908A CN110514523A CN 110514523 A CN110514523 A CN 110514523A CN 201910809908 A CN201910809908 A CN 201910809908A CN 110514523 A CN110514523 A CN 110514523A
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000003825 pressing Methods 0.000 claims description 45
- 230000002706 hydrostatic effect Effects 0.000 claims description 8
- 230000000116 mitigating effect Effects 0.000 claims description 3
- 239000004035 construction material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 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
- 238000012669 compression test Methods 0.000 description 1
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- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- 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
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- 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
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- 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
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to construction material technical field of test equipment, more specifically, it is related to a kind of stress loading combination unit, true triaxial pressure testing is carried out to cube specimen on weighted platform for being placed on single-axis servo press machine, described device includes two groups of first charging assemblies for the circumferential power transmission to cube specimen being arranged in a mutually vertical manner, and the second charging assembly for the transmitting axle force to cube specimen；First charging assembly, the second charging assembly are in close contact with the circumferential surface of cube specimen, axial face respectively；It is connected with force application mechanism on first charging assembly, control system is connected on the force application mechanism, is equipped with displacement measurement component on first charging assembly and the second charging assembly.Restraint stress of the invention can be precisely controlled, and manufacturing cost is low, easy to operate, and applied widely.
Description
Technical field
The present invention relates to construction material technical field of test equipment, combine the unit more particularly, to a kind of stress loading.
Background technique
Effect while various construction materials suffer from multiaxial stress in practical applications understands them under this condition
Mechanical property, damage -form and constitutive relation etc. there is important directive significance to their applications in practical projects.Its
In, true triaxial compressive stress state, i.e. material are determined equal compression by not of uniform size on three principal axes of stress, representated by
True engineer application range it is relatively broad, such as concrete filled steel tube, fiber-reinforced polymer confined concrete structure, core
Reactor pressure vessel concrete structure, high-rise big figure concrete component, earth's surface soil below or rock etc..However it is conventional
Axial compression test can not really reflect real bearing state locating for the material in above structure, it is therefore desirable to by true triaxial pressure
The means of test find out basic mechanical rule of above-mentioned material under the conditions of true triaxial pressure, and carry out on this basis further
Systematic Study.
Since the three-dimensional principal stress of true triaxial pressure test is all not necessarily equal, test is in load control, equipment selection, operation
Etc. difficulty it is all larger.Existing true triaxial pressure testing machine is mainly worked by pressure testing machine, horizontal bearing frame and bottom flat
Platform composition.True triaxial presses testing machine to set up independent hydraulic cylinder and auxiliary device respectively in three mutually orthogonal directions to divide
Not Shi Jia three-dimensional principal stress, the load ratio in three directions controls by corresponding controller, can carry out any stress ratio
Two axis and triaxial state of stress test.But the principle of existing true triaxial pressure testing machine is more complex, development cost is higher, and the country is only
There are a small number of efficient or mechanisms to possess, improves research difficulty.
Summary of the invention
It is an object of the invention to overcome the shortcomings of existing true triaxial pressure testing machine higher cost, a kind of stress is provided and is added
Combination unit is carried, restraint stress can be precisely controlled, and manufacturing cost is low, easy to operate and applied widely.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of stress loading combination unit is provided, to cube on the weighted platform for being placed on single-axis servo press machine
Test specimen carry out true triaxial pressure testing, described device include two be arranged in a mutually vertical manner for the circumferential direction of cube specimen pass
First charging assembly of power, and the second charging assembly for the transmitting axle force to cube specimen；The first load group
Part, the second charging assembly are in close contact with the circumferential surface of cube specimen, axial face respectively；It is connected on first charging assembly
There is force application mechanism, control system is connected on the force application mechanism, is all provided on first charging assembly and the second charging assembly
There is displacement measurement component.
The present invention is a kind of stress loading combination unit, and force application mechanism passes through the power transmission of the first charging assembly, to cube
The non-conterminous two circumferential surfaces force of test specimen, the size of force can accurately control force application mechanism by control system,
It is separately connected force application mechanism and control system on the first charging assembly being arranged in a mutually vertical manner due to two, makes cube specimen
The size of power suffered by two groups of circumferential surfaces be it is mutually indepedent and constant, make test effect more preferably；Single-axis servo press machine passes through
The power transmission of second charging assembly exerts a force to two axial faces of cube specimen, keeps the axial face of cube specimen uniform
Stress reduces test error；The displacement measurement component being arranged on first charging assembly and the second charging assembly, can be used in recording
The process of cube specimen deformation makes test convenient for operation.
In order to enable the first charging assembly effectively to the circumferential surface power transmission of cube specimen, first charging assembly
Including the loaded member that two end plates and two are in close contact with the circumferential surface of cube specimen, a loaded member passes through the force machine
Structure is connect with end plate, and another loaded member passes through the first pressing plate and another end plate connection for power transmission；Lead between the end plate
Cross several connecting rod connections.
It is described to add in order to be convenient for loaded member to cube specimen power transmission and convenient for the connection with displacement measurement component
Holder is the second pressing plate being in close contact with the circumferential surface of cube specimen, and several be used for and position is connected on second pressing plate
First connector of shift measurement component connection.
In order to enable the second charging assembly effectively to the axial face power transmission of cube specimen, second charging assembly
Including the first briquetting and the second briquetting being in close contact for two axial faces with cube specimen, first briquetting and the
Two briquettings are detachably connected.
In order to measure the displacement of the second pressing plate and the first briquetting, institute's displacement measurement component includes several for measuring
The first circumferentially displaced displacement meter and based on the second displacement for measuring axial displacement, the first displacement meter and the first connector connect
It connects, second displacement meter is connect with the first briquetting.
In order to enable control system to accurately control the size that force application mechanism exerts a force to cube specimen, the control system
Including sequentially connected oil pump, check-valves, overflow valve, hydralic pressure gauge, hydrostatic sensor, data collecting instrument, the oil pump also with overflow
Valve connection is flowed, the force application mechanism is connect with hydrostatic sensor.
For the ease of the connection between the second briquetting and loaded member, second briquetting is used to support load equipped with several
The supporting element of part, several supporting elements are connect with the second pressing plate.
In order to enable force application mechanism effectively to exert a force to loaded member, the force application mechanism is jack, the jack
One end and end plate connection, the other end are connect with the second pressing plate.
In order to reduce the friction between the first charging assembly, the second charging assembly and cube specimen, second pressing plate,
The thin slice for reducing friction is equipped between first briquetting, the second briquetting and cube specimen.
Stress is concentrated in order to prevent, is equipped between the force application mechanism, the first pressing plate and end plate and is concentrated for mitigating stress
Gasket.
Compared with prior art, the beneficial effects of the present invention are:
It is separately connected force application mechanism and control system on (1) two the first charging assembly being arranged in a mutually vertical manner, makes to stand
Stress intensity suffered by two groups of opposite circumferential surfaces of cube test specimen be it is mutually indepedent and constant, make test effect more preferably.
(2) single-axis servo press machine passes through the power transmission of the first briquetting and the second briquetting, to two axial directions of cube specimen
Face force, enables the axial face uniform stressed of cube specimen, reduces test error.
The setting of (3) first displacement meters and second displacement meter can be used in the process for recording cube specimen deformation, make to try
It tests convenient for operation and data preparation.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of stress loading combination unit of the present invention.
Fig. 2 is the main view of Fig. 1.
Fig. 3 is the top view of Fig. 2.
Fig. 4 is the structural schematic diagram of first charging assembly of the invention.
Fig. 5 be loaded member of the present invention, the second charging assembly, displacement measurement component structural schematic diagram.
Fig. 6 is the structural schematic diagram of control system of the present invention.
Fig. 7 is the structural schematic diagram that the present invention is placed on single-axis servo press machine.
It is as follows to illustrate description of symbols:
The first charging assembly of 1-, 11- end plate, 12- connecting rod, the first pressing plate of 13-, 14- loaded member, the second pressing plate of 141-,
The first connector of 142-, 2- force application mechanism, 21- jack, the second charging assembly of 3-, the first briquetting of 31-, the second briquetting of 32-,
33- supporting element, 4- displacement measurement component, the first displacement meter of 41-, 42- second displacement meter, 43- fixture, the second connector of 44-, 5-
Control system, 51- oil pump, 52- check-valves, 53- overflow valve, 54- hydralic pressure gauge, 55- hydrostatic sensor interface, 56- hydraulic sensing
Device, 57- data collecting instrument, 6- gasket, 7- cube specimen, 8- single-axis servo press machine.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing
Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified
Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing
Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment 1
A kind of first embodiment of stress loading combination unit of the present invention as shown in Figure 1 to Figure 7 shows the, the device is for placing
True triaxial pressure testing is carried out to cube specimen 7 on the weighted platform of single-axis servo press machine 8, device includes two mutual
Vertically disposed the first charging assembly 1 for the circumferential power transmission to cube specimen 7, and for cube specimen 7
Second charging assembly 3 of transmitting axle force；First charging assembly 1, the second charging assembly 3 respectively with the circumferential surface of cube specimen 7,
Axial face is in close contact；It is connected with force application mechanism 2 on first charging assembly 1, is connected with control system 5 on force application mechanism 2, first
Displacement measurement component 4 is equipped on charging assembly 1 and the second charging assembly 3.
Force application mechanism 2 passes through the power transmission of the first charging assembly 1, exerts a force to 7 non-conterminous two circumferential surfaces of cube specimen,
The size of force can accurately control force application mechanism 2 by control system 5, due to two be arranged in a mutually vertical manner first
It is separately connected a force application mechanism 2 and control system 5 on charging assembly 1, makes 7 two groups of cube specimen opposite circumferential surface institutes
The size for the power being subject to is independent from each other, and makes test effect more preferably；Single-axis servo press machine 8 passes through the second charging assembly 3
Power transmission exerts a force to two axial faces of cube specimen 7, enables the axial face uniform stressed of cube specimen 7, reduces test
Error；The displacement measurement component 4 being arranged on first charging assembly 1 and the second charging assembly 3 can be used in recording cube specimen
The process of 7 deformation makes test convenient for operation.
In addition, the first charging assembly 1 includes the circumferential surface close contact of two end plates 11 and two with cube specimen 7
Loaded member 14, a loaded member 14 are connect by force application mechanism 2 with end plate 11, and another loaded member 14 passes through first for power transmission
Pressing plate 13 is connect with another end plate 11；It is connected between end plate 11 by several connecting rods 12.End plate 11, connecting rod 12, first are pressed
The setting of plate 13, loaded member 14 enables the first charging assembly 1 effectively to the circumferential surface power transmission of cube specimen 7.
Wherein, loaded member 14 is the second pressing plate 141 being in close contact with the circumferential surface of cube specimen 7, the second pressing plate 141
On be connected with several the first connectors 142 for connecting with displacement measurement component 4.The setting of second pressing plate 141 can be convenient for
For loaded member 14 to 7 power transmission of cube specimen, the setting of the first connector 142 can be convenient for the connection with displacement measurement component 4.
Wherein, the second charging assembly 3 includes the first briquetting being in close contact for two axial faces with cube specimen 7
31 and second briquetting 32, the first briquetting 31 and the second briquetting 32 are detachably connected.The setting of first briquetting 31 and the second briquetting 32
Enable the second charging assembly 3 effectively to the axial face power transmission of cube specimen 7.
Wherein, the second briquetting 32 be equipped with several supporting elements 33 for being used to support loaded member 14, several supporting elements 33 with
The connection of second pressing plate 141.The setting of supporting element 33 can be convenient for the connection between the second briquetting 32 and loaded member 14.
Wherein, displacement measurement component 4 includes several for measuring the first circumferentially displaced displacement meter 41 and for measuring axis
To the second displacement meter 42 of displacement, the first displacement meter 41 is connect with the first connector 142, second displacement meter 41 and the first briquetting 31
Connection.The setting of first displacement meter 41 can be used in measuring the displacement of the second pressing plate 141, and the setting of second displacement meter 42 can be used
In the displacement for measuring the first briquetting 31.
Wherein, force application mechanism 2 is jack 21, and one end of jack 21 is connect with end plate 11, the other end and the second pressing plate
141 connections.The setting of jack 21 enables force application mechanism 2 effectively to exert a force to loaded member 14.
Specifically, as shown in Figures 1 to 4, a jack 21 is opposed by one group of first charging assembly 1 in the present embodiment
When the non-conterminous circumferential surface of cube test specimen 7 carries out force effect, the first charging assembly 1, jack 21, cube specimen 7 it
Between connection type are as follows: one piece of end plate 11,21, one piece of second pressing plate 141 of jack, cube specimen 7, another piece of the second pressing plate
141, the first pressing plate 13, another piece of end plate 11 are sequentially connected with, and are connected between two end plates 11 by four connecting rods 12, four companies
Extension bar 12 is respectively positioned on the corner positions of end plate 11.
First pressing plate 13 is the pressing plate with boss, and the cross section of boss and pressing plate is circle.The both ends of connecting rod 12
Equipped with external screw thread, the corner of end plate 11 is equipped with connecting hole, and connecting rod 12 passes through the connecting hole, then is carried out by nut and external screw thread
Locking.End plate 11 is attached by bolt with jack 21, end plate 11 and the first pressing plate 13；On one piece of second pressing plate 141
Equipped with the groove that the connecting pin with jack 21 matches, another piece of the second pressing plate 141 is equipped with the connection with the first pressing plate 13
The groove to match is held, the setting of groove can be convenient for the overlap joint between jack 21, the first pressing plate 13 and the second pressing plate 141.
The groove depth of the present embodiment further groove is 1~5mm.
Wherein the end plate 11 in one group of first charging assembly 1 be side length be 280mm, the square plate of thickness 60mm, another group
End plate 11 in one charging assembly 1 is the square plate of long 280mm, width 340mm, thickness 60mm；The setting can be convenient for two group first
Charging assembly 1 is mutually perpendicular to install, and prevents the connecting rod 12 in two group of first charging assembly 1 from hindering.
As shown in figure 5, the first connector 142 is the top plate of L-shaped structure, there are two for connection on every piece of second pressing plate 141
A connection piece 142, two the first connectors 142 are connected to the two sides of the second pressing plate 141, and the first displacement meter 41 is connected to
The end position of a connection piece 142；Second pressing plate 141 is the square plate that side length is 149mm.
Specifically, the first briquetting 31 in the present embodiment, be separately connected that there are two fixture 43, the first briquettings on the second briquetting 32
Fixture 43 on 31 clamps one end of second displacement meter 42, and the fixture 43 on the second briquetting 32 clamps the one of the second connector 44
End, the other end of second displacement meter 42 and the other end of the second connector 44 are detachably connected, and make the first briquetting 31 and the second pressure
It can be realized between block 32 detachable.It should be noted that the second connector 44 can be the cylindrical body similar with displacement meter shape
Structure, or connecting rod.A length of 149mm, width 149mm, a height of 140mm of first briquetting 31；Second briquetting it is a length of
150mm, width 150mm, a height of 140mm.Supporting element 33 is the link block that section is right angled triangle, is provided with eight altogether, is used
In the second pressing plate 141 of support.
In addition, control system 5 includes sequentially connected oil pump 51, check-valves 52, overflow valve 53, hydralic pressure gauge 54, hydraulic biography
Sensor 56, data collecting instrument 57, oil pump 51 are also connect with overflow valve 53, and force application mechanism 2 is connect with hydrostatic sensor 56.Check-valves
52 setting can prevent oily refluence during peripheral force exports from causing to damage to the impact of 51 oil outlet of oil pump；Overflow
The setting of valve 53 can enable the piston automatic retracted of jack 21 to adapt to circumferential stretching strain, and keep one in the process
A stable circumferential stress output presses test requirements document to meet the constant true triaxial of circumferential stress；The setting of hydralic pressure gauge 54 can
Intuitively reflection oil pump 51 is size hydraulic added by jack 21；Hydrostatic sensor 56 is connect with data collecting instrument 57, is used for
In real time record test during jack 21 hydraulic variation, and with it is axially loaded recorded in test and it is each to be displaced on time
Between it is corresponding.
Specifically, as shown in fig. 6, in the present embodiment hydralic pressure gauge 54, jack 21 with the hydraulic biography of hydrostatic sensor 56
Sensor interface 55 connects.
As shown in fig. 7, the installation process of the device is as follows when being tested:
S1. the second briquetting 32 is placed on the platform of single-axis servo press machine and is aligned middle line；
S2. after step S1, cube specimen 7 is placed in the upper surface of the second briquetting 32, and is aligned middle line；
S3. upon step s 2, the first briquetting 31 is placed in the upper surface of cube specimen 7, and is aligned middle line；
S4. after step s 3, two piece of second pressing plate 141 is placed in two on supporting element 33 and with cube specimen 7
Non-conterminous circumferential surface is in close contact；
S5. after step s4, control system 5 is connect with jack 21, then opens check-valves 52, oil pump 51 start to
Jack 21 send oil, until the piston of jack 21 stretches out 20mm, and overflow valve 53 keeps not overflow situation during this；
S6. after step s 5, the piston end of jack 21 and one piece of end plate 11 are bolted, then first is pressed
Plate 13 is bolted with another piece of end plate 11；
S7. after step S6, jack 21 and the first pressing plate 13 are respectively embedded into the groove of two piece of second pressing plate 141
On；It can come support jack 21 and the first pressing plate 13 by other object blocks during this, make held stationary in installation process；
S8. after step s 7, two end plates 11 are attached by four connecting rods 12, on tightening connecting rod 12
When nut, hydraulic variation is recorded by data collecting instrument 57, and whether the data for comparing hydralic pressure gauge 54 are consistent；
S9. after step s8, the first displacement meter 41 and second displacement meter 42 are installed on the apparatus；
S10. for the installation of another group of the first charging assembly 1, step S4 to S9 is repeated；
S11. after step slo, starting single-axis servo press machine 8 just suspends to after there is reading；
S12. after step s 11, overflow valve 53 is adjusted to target value, is denoted as p1And p2；For p1And p2The control at place
The oil circuit of system 5 is referred to as p1Control oil circuit and p2Control oil circuit；
S13. after step s 12, adjust hydraulic to target value in each control oil circuit:
Use p1The oil pump 51 of control oil circuit pressurizes, until hydralic pressure gauge 54 shows p1It is hydraulic in control oil circuit to reach p1
1/3；Then p is used2The oil pump 51 of control oil circuit pressurizes, until hydralic pressure gauge 54 shows p2It is hydraulic in control oil circuit to reach
p21/3；
Then, p is made by the pressurization of oil pump 51 respectively1Control oil circuit and p2Hydraulic 2/3p is respectively reached in control oil circuit1With
2/3p2；
Finally, making p by the pressurization of oil pump 51 respectively1Control oil circuit and p2Hydraulic target value is respectively reached in control oil circuit
p1And p2, and close the check-valves 52 of two control oil circuits；
S14. after step s 13, p at this time is recorded by data collecting instrument 571Control oil circuit, p2Control oil circuit, single shaft are watched
The reading of press machine 8 and all first displacement meters 41, second displacement meter 42 is taken, and the state defined at this time is original state；
S15. after step s 14, it is again started up single-axis servo press machine 8, loading speed is set as 0.1 mm/min, and
Axial displacement is no more than 10mm, passes through the record of data collecting instrument 57 p in loading procedure1Control oil circuit, p2Control oil circuit, single shaft are watched
The reading of press machine 8 and all first displacement meters 41, second displacement meter 42 is taken, and by subtracting the initial shape in step S14
State obtains each increment.
Embodiment 2
The present embodiment is similar to Example 1, institute the difference is that, as shown in Figures 2 to 4, in the present embodiment second pressure
The thin slice for reducing friction is equipped between plate 141, the first briquetting 31, the second briquetting 32 and cube specimen 7.Thin slice is set
Set the friction that can be reduced between the first charging assembly 1, the second charging assembly 3 and cube specimen 7.
In addition, being equipped with the gasket 6 for mitigating stress concentration between force application mechanism 2, the first pressing plate 13 and end plate 11.Gasket
6 setting can prevent stress from concentrating on cube specimen 7.
Specifically, as shown in Figures 2 to 5, thin slice is ptfe sheet in the present embodiment, and gasket 6 is steel gasket.
In step s 2, after ptfe sheet is placed in the upper surface of the second briquetting 32, then cube specimen 7 set
In the upper surface of the second briquetting 32；
In step s3, after ptfe sheet is placed in the lower surface of the first briquetting 31, then the first briquetting 31 set
In the upper surface of cube specimen 7；
In step s 6, it is attached again with end plate 11 after installing gasket 6 additional on the piston end of jack 21；In the first pressure
Plate 13 on the joint face of end plate 11 install additional gasket 6 after be attached again with end plate 11.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. a kind of stress loading combines the unit, cube is tried on the weighted platform for being placed on single-axis servo press machine (8)
Part (7) carries out true triaxial pressure testing, which is characterized in that described device include two groups be arranged in a mutually vertical manner for cube
The first charging assembly (1) of the circumferential power transmission of test specimen (7), and add for second of the transmitting axle force to cube specimen (7)
It carries component (3)；First charging assembly (1), the second charging assembly (3) respectively with the circumferential surface of cube specimen (7), axial direction
Face is in close contact；It is connected with force application mechanism (2) on first charging assembly (1), is connected with control on the force application mechanism (2)
System (5) is equipped with displacement measurement component (4) on first charging assembly (1) and the second charging assembly (3).
2. a kind of stress loading combination unit according to claim 1, which is characterized in that first charging assembly (1)
Including the loaded member (14) that two end plates (11) and two are in close contact with the circumferential surface of cube specimen (7), a loaded member
(14) it is connect by the force application mechanism (2) with end plate (11), another loaded member (14) passes through the first pressing plate for power transmission
(13) it is connect with another end plate (11)；It is connected between the end plate (11) by several connecting rods (12).
3. a kind of stress loading combination unit according to claim 2, which is characterized in that the loaded member (14) is and stands
The second pressing plate (141) that the circumferential surface of cube test specimen (7) is in close contact is connected with several be used on second pressing plate (141)
The first connector (142) being connect with displacement measurement component (4).
4. a kind of stress loading combination unit according to claim 3, which is characterized in that second charging assembly (3)
It is described including the first briquetting (31) and the second briquetting (32) for being in close contact with two axial faces of cube specimen (7)
First briquetting (31) and the second briquetting (32) are detachably connected.
5. a kind of stress loading combination unit according to claim 4, which is characterized in that institute's displacement measurement component (4)
Including several by measuring circumferentially displaced the first displacement meter (41) and based on the second displacement for measuring axial displacement (42), the
One displacement meter (41) is connect with the first connector (142), and second displacement meter (41) is connect with the first briquetting (31).
6. a kind of stress loading combination unit according to claim 1, which is characterized in that the control system (5) includes
Sequentially connected oil pump (51), check-valves (52), overflow valve (53), hydralic pressure gauge (54), hydrostatic sensor (56), data collecting instrument
(57), the oil pump (51) also connect with overflow valve (53), and the force application mechanism (2) connect with hydrostatic sensor (56).
7. a kind of stress loading combination unit according to claim 4, which is characterized in that set on second briquetting (32)
There are several supporting elements (33) for being used to support loaded member (14), several supporting elements (33) connect with the second pressing plate (141).
8. a kind of stress loading combination unit according to claim 3, which is characterized in that the force application mechanism (2) is thousand
Jin top (21), one end of the jack (21) are connect with end plate (11), and the other end is connect with the second pressing plate (141).
9. a kind of stress loading combination unit according to claim 4, which is characterized in that second pressing plate (141), the
The thin slice for reducing friction is equipped between one briquetting (31), the second briquetting (32) and cube specimen (7).
10. a kind of stress loading combination unit according to claim 2, which is characterized in that the force application mechanism (2), the
The gasket (6) for mitigating stress concentration is equipped between one pressing plate (13) and end plate (11).
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| CN111751276A (en) * | 2020-07-29 | 2020-10-09 | 宁波大学 | Loading device and method for bonding performance test of reinforcement and confined concrete |
| CN117344807A (en) * | 2023-10-20 | 2024-01-05 | 广州开发区建设工程检测中心有限公司 | Vertical bearing capacity device for detecting foundation pile and detection method thereof |
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