CN106404539B - Test method for realizing uniform unidirectional stretching - Google Patents
Test method for realizing uniform unidirectional stretching Download PDFInfo
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- CN106404539B CN106404539B CN201611030156.XA CN201611030156A CN106404539B CN 106404539 B CN106404539 B CN 106404539B CN 201611030156 A CN201611030156 A CN 201611030156A CN 106404539 B CN106404539 B CN 106404539B
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- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 93
- 238000009864 tensile test Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 239000003292 glue Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 238000004026 adhesive bonding Methods 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses a test method for realizing uniform unidirectional stretching, which comprises the following steps: bonding/welding the test piece and the connecting piece together to form a tight connection; and a push plate device is added on the left and right of the connecting piece. Step two: and clamping the test piece, clamping the connecting piece by using the unidirectional tensile test device, and obtaining the width displacement data of the free area of the test piece by using an extensometer. Step three: and feeding the width displacement data back to the computer control system, so that a motor or an air cylinder of the unidirectional tensile test device moves to drive the push plate device to apply appropriate pressure to the left direction and the right direction of the connecting piece, and the width deformation of the clamping area is the same as that of the free area. Step four: and in the test process, the extensometer is used for acquiring real-time experimental data of the width deformation. Step five: and measuring the test piece after the test, and comparing the measured test piece with the acquired experimental data. The invention realizes the uniform deformation of the whole test piece and overcomes the defect of non-uniform deformation of the adhesive fixed area and the free area of the test piece in the traditional test.
Description
Technical field
The present invention relates to a kind of test methods for realizing uniform simple tension, on the basis of traditional one directional tensile test,
The test method for the homogeneous deformation for realizing test specimen in simple tension in bigger range of strain belongs to Material mechanics test technology
And equipment technical field.
Background technique
Traditional one directional tensile test generallys use the test specimen of " I " fonts, as shown in Figure 1, using the examination of this shape
Part test piece deformation during simple tension is not visibly homogeneous, and deflection is bigger, and degree of irregularity is bigger.Disadvantage: so that material
Expect that the homogeneous deformation amount that can reach is limited；It processes complex, there is certain waste of material.
It is therefore proposed that a kind of be conveniently connected and fixed and measure, and it can be realized the homogeneous deformation of test specimen in experimentation.
It realizes that uniform simple tension plays an important role test specimen forming aspect, is not only able to reach drawing more unidirectional than tradition
It stretches and tests bigger deformation range, and the utilization rate of material is high.
Realizing to test specimen uniform simple tension can select the connector that has biggish frictional force with test specimen (connector is wanted
It is thicker than test specimen), test specimen upper and lower (Z-direction) and left and right (Y-direction) is fixed together with connector gluing respectively first (X, Y,
Z-direction is as shown in Figure 2), a push plate device (existing apparatus) is added in left and right (Y-direction) of connector, with push plate device by oil
Cylinder or motor control movement, then fixed upper and lower (Z-direction) connector of stretching device, want while simple tension
The data that the vertical direction (Y-direction) of the simple tension (X-direction) of connector is measured and fed back according to extensometer fill push plate
It sets and applies a suitable pressure, and stretching device and cylinder or motor move on a motion platform；Make specimen holder area
(the fixed test specimen part of gluing) width deformation is consistent with the width deformation amount of free zone, to guarantee test specimen in simple tension process
In homogeneous deformation.
Summary of the invention
In order to overcome the inhomogeneities of simple tension, the above problem existing for methods and techniques, the present invention provides one
Kind realizes uniform one directional tensile test method, it can realize the test method of uniform simple tension to test specimen of concern, can
The homogeneous deformation of test specimen is studied.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of test method for realizing uniform simple tension, it can be realized using feedback transmitter:
This method retightens test specimen in one directional tensile test equipment, to use on one directional tensile test device
Test specimen and connector have biggish friction, after be fixed together with seccotine is viscous, then for stretching device fixedly connected part, packet
Containing extensometer, force snesor, computer control system, motor or cylinder, it is characterised in that: in one directional tensile test, make to try
Part and connector gluing are fixed together to form close connection, and the transversely deforming amount (Y of test specimen free zone is measured using extensometer
Direction), computer control system is then fed back to, determination is applied in the push plate device of test specimen outer connectors left and right (Y-direction)
Add great pressure, thus guarantee so that the transversely deforming of the free zone of test specimen and transversely deforming (Y-direction) of clamp area are identical,
The Uniform Tension deformation to test specimen can be effectively realized by computer control system control simple tension device, that is, realizes examination
The unidirectional Uniform Tension of part.
One directional tensile test device (existing apparatus) includes two be located on two vertical direction (Y-direction) of test specimen
The identical stretching device of group, every group of stretching device are converted electric machine main shaft to mechanics sensor by a sets of transmission mechanism
Stretching, the other end of mechanics sensor is connected with clamping device, and the final movement for realizing clamping device carries out phase to test specimen
It is tested with load path.While using to test specimen simple tension, (Y-direction) left and right to test specimen outer connectors is filled with push plate
It sets and pressure is applied to connector, the size of pulling force and pressure can feed back to computer control system according to the reading result of extensometer
System is controlled.
In the method for the present invention, using test specimen and one directional tensile test device, realization proportional loading can be convenient.
In conclusion the present invention is a kind of test method for realizing uniform simple tension, specific step is as follows for this method:
Step 1: firstly, upper and lower (Z-direction) and connector of test specimen glue/are welded together to form close connection,
To be fixed together.To left and right (Y-direction) the same above-mentioned steps of test specimen, test specimen and connector are fixed together；It is connecting
Left and right (Y-direction) of part adds a push plate device (push plate device is existing apparatus).(connector is pushed, so that test specimen
Laterally deform.)
Step 2: clamping is carried out to test specimen, one directional tensile test device holding attachment (Z-direction connector) carries out single
To stretching, width (Y-direction) displacement data of test specimen free zone is measured using the extensometer for having certain gauge length and range.
Step 3: extensometer in step 2 is measured to width (Y-direction) displacement data of test specimen free zone, feeds back to calculating
Machine control system makes motor or the cylinder moving of one directional tensile test device to drive push plate by computer control system
Device (Y-direction) both direction (direction of power all points to the origin of coordinate system) left and right to connector applies suitable pressure, makes
The width deformation amount (Y-direction) of the width deformation amount and free zone that obtain clamp area is identical.
Step 4: the acquisition of real-time experimental data is carried out to width deformation amount using extensometer during the test.
Step 5: can measure test specimen after test, compare with the experimental data of acquisition, as a result coincide.
The present invention is a kind of to realize that uniform one directional tensile test method, advantage and effect are: carrying out uniformly unidirectional draw
Stretch in test, can carry out the real-time measurement strained in deformation process, test after neutralization test can very easily to strain into
Row measurement measures the data feedback of the transversely deforming of test specimen free zone to computer control system, then to push plate using extensometer
Device applies suitable pressure, keeps the deformation in the gluing fixed area Y-direction of test specimen consistent with the width displacement deformation of free zone,
To realize test specimen entirety homogeneous deformation, overcomes test specimen gluing fixed area and free zone in traditional one directional tensile test and deform not
Uniform defect.
Detailed description of the invention
Fig. 1 is test specimen schematic diagram used in traditional one directional tensile test.
Fig. 2 is using the method in the present invention, the schematic diagram in the direction of test specimen used.
Fig. 3 is that have a biggish friction using the method in the present invention with test specimen and connector, rear gluing be fixed together and
The structural schematic diagram of uniform one directional tensile test device for one directional tensile test device；Wherein, the same A of the configuration of B, C, D；
Note: A is the attachment device of cylinder 6 and push plate device 8, can use and commonly be bolted or weld, and B,
C, the device of D uses device identical with A.
Fig. 4 is that have biggish friction using the method in the present invention with test specimen and connector, and rear gluing is fixed together,
The partial enlargement test specimen figure of push plate device.
Label declaration as shown in the figure:
1, force snesor, 2, clamping device, 3, Z-direction connector, 4, computer control system,
5, Y-direction connector, 6, motor or cylinder, 7, test specimen, 8, push plate device,
9, extensometer, A, B, C, D, attachment device
Specific embodiment
Device provided by the present invention is described in detail is further described with reference to the accompanying drawing.
The present invention is a kind of to realize uniform one directional tensile test method, step 1: firstly, upper and lower (Z-direction) of test specimen and
Connector sticks together to form close connection, to be fixed together and (weld to fix stronger can use).To examination
Left and right (Y-direction) the same above-mentioned steps of part, are fixed together test specimen and connector；Add in left and right (Y-direction) of connector
Add a push plate device (push plate device is existing apparatus).(connector is pushed, so that test specimen laterally deforms.)
Step 2: carrying out clamping to test specimen, and one directional tensile test device clamps Z-direction connector, carries out simple tension, makes
Width (Y-direction) displacement data of test specimen free zone is measured with the extensometer for having certain gauge length and range.
Step 3: extensometer in step 2 is measured to width (Y-direction) displacement data of test specimen free zone, feeds back to calculating
Machine control system makes motor or the cylinder moving of one directional tensile test device to drive push plate by computer control system
Device (Y-direction) both direction (direction of power all points to the origin of coordinate system) left and right to connector applies suitable pressure, makes
The width deformation amount (Y-direction) of the width deformation amount and free zone that obtain clamp area is identical.
Step 4: the acquisition of real-time experimental data is carried out to width deformation amount using extensometer during the test.
Step 5: can measure test specimen after test, compare with the experimental data of acquisition, as a result coincide.
As shown in Figure 3, make to try using one directional tensile test device (existing device) using method proposed by the present invention
Part realizes the experimental rig of the test method of homogeneous deformation in simple tension, includes one directional tensile test device, force snesor
1, computer control system 4, motor or cylinder 6, push plate device 8, extensometer 9, wherein one directional tensile test device includes two groups
Identical stretching device, every group of stretching device all pass through a sets of transmission mechanism and convert electric machine main shaft to mechanics sensor
The other end of 1 stretching, mechanics sensor 1 is connected with clamping device 2, the final linear movement for realizing clamping device 2, to examination
Part 7 carries out tension test.
The data feedback measured using extensometer to computer control system 4, by computer control system 4 make motor or
Push plate device 8 applied force of the cylinder 6 to the outside of test specimen Y-direction connector 5；4 comprehensively control of computer control system is unidirectionally drawn
Experimental rig is stretched to the drawing process of rectangle test specimen, motor or cylinder 6 indirectly to clamp area (Y-direction connector 5) applied force.
Specific test process of the invention is as follows: upper and lower (Z-direction) and connector of test specimen are sticked together, and it is close to be formed
Connection；To left and right (Y-direction) the same above-mentioned steps of test specimen, test specimen and connector are fixed together；Connector a left side,
Right (Y-direction) adds a push plate device；The two of rectangle test specimen is clamped respectively with the clamping device in two groups of stretching devices first
End carries out identical load path test to rectangle test specimen, measures test specimen freedom using the extensometer 9 for having certain gauge length and range
Width (Y-direction) displacement data in area；Computer control system 4 receives the width displacement for the test specimen free zone that extensometer 9 measures
Then parameter controls motor or cylinder 6 along specified path and carries out applied force to clamp area (Y-direction connector 5) indirectly, makes to clamp
Region reaches and is maintained at preset width displacement range (i.e. the width displacement of the free zone that measures of extensometer)；Computer control system
System control one directional tensile test device carries out the simple tension of preset ratio and disproportional to rectangle test specimen, and passes through in real time
The parameters of material in drawing process are carried out sorting-out in statistics by force snesor, finally analyze material under different in width displacement
Simple tension mechanical performance index, realize the forming research of the test of uniform simple tension；Final realization is uniformly unidirectional
It stretches.
In conclusion proposed by the present invention is a kind of forming test method of test for realizing uniform simple tension, with biography
The forming test method of the one directional tensile test of system has very big difference.The connection of motor or cylinder and push plate device is introduced
Enter in equipment, to specimen holder area applied force, the width for occurring that test specimen in clamp area of concern (Y-direction) deflection with from
It is identical by sector width deflection, overcome clamp area in traditional one directional tensile test forming experiment method cannot deform and
The defects of waste of material, and the development to traditional one directional tensile test method, can effectively obtain material in identical load
Metal forming under state improves the utilization rate of material.
Claims (1)
1. a kind of test method for realizing uniform simple tension, is characterized in that: specific step is as follows for this method:
Step 1: the upper and lower and connector of test specimen glue/is welded together to form close connection, to be fixed together；It is right
The left and right same above-mentioned steps of test specimen, are fixed together test specimen and connector；In one push plate device of left and right addition of connector；
Step 2: clamping is carried out to test specimen, one directional tensile test device holding attachment carries out simple tension, certain using having
The extensometer of gauge length and range measures the width displacement data of test specimen free zone；
Extensometer in step 2: being measured the width displacement data of test specimen free zone, feeds back to computer control system by step 3,
By computer control system, make motor or the cylinder moving of one directional tensile test device to drive push plate device to connector
Left and right both direction applies suitable pressure, so that the width deformation amount of clamp area is identical with the width deformation amount of free zone；
Step 4: the acquisition of real-time experimental data is carried out to width deformation amount using extensometer during the test；
Step 5: measuring test specimen after test, compares with the experimental data of acquisition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611030156.XA CN106404539B (en) | 2016-11-15 | 2016-11-15 | Test method for realizing uniform unidirectional stretching |
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| CN201611030156.XA CN106404539B (en) | 2016-11-15 | 2016-11-15 | Test method for realizing uniform unidirectional stretching |
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| CN106404539A CN106404539A (en) | 2017-02-15 |
| CN106404539B true CN106404539B (en) | 2019-01-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110274830A (en) * | 2019-04-18 | 2019-09-24 | 防灾科技学院 | A kind of drift-sand Modified soil tensile characteristics test macro |
| CN110220785B (en) * | 2019-07-01 | 2021-08-13 | 上海交通大学 | Gel stretching device |
| US20210232735A1 (en) * | 2020-01-29 | 2021-07-29 | Disney Enterprises, Inc. | Simulation-Based Material Characterization |
| CN112414864B (en) * | 2021-01-22 | 2021-04-16 | 山东科技职业学院 | Building steel connecting piece high temperature structural strength testing arrangement |
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| US3859848A (en) * | 1972-08-11 | 1975-01-14 | Zwick & Co Kg | Test frame with selectively positionable specimen holders |
| CN1587964A (en) * | 2004-09-24 | 2005-03-02 | 东华大学 | Combined measuring method and device for stretching, compressing, bursting and prick-cut |
| CN202066749U (en) * | 2011-04-27 | 2011-12-07 | 常州市建筑科学研究院股份有限公司 | Test fixture for testing tensile strength |
| CN102645371A (en) * | 2012-04-12 | 2012-08-22 | 北方工业大学 | Biaxial material tensile test device and method applying same |
| CN205656070U (en) * | 2016-04-05 | 2016-10-19 | 西南交通大学 | Fibre tensile testing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61219850A (en) * | 1985-03-26 | 1986-09-30 | Shimadzu Corp | Method for measuring elongation strain |
| JP4207674B2 (en) * | 2003-06-09 | 2009-01-14 | 株式会社島津製作所 | Material testing machine |
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2016
- 2016-11-15 CN CN201611030156.XA patent/CN106404539B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3859848A (en) * | 1972-08-11 | 1975-01-14 | Zwick & Co Kg | Test frame with selectively positionable specimen holders |
| CN1587964A (en) * | 2004-09-24 | 2005-03-02 | 东华大学 | Combined measuring method and device for stretching, compressing, bursting and prick-cut |
| CN202066749U (en) * | 2011-04-27 | 2011-12-07 | 常州市建筑科学研究院股份有限公司 | Test fixture for testing tensile strength |
| CN102645371A (en) * | 2012-04-12 | 2012-08-22 | 北方工业大学 | Biaxial material tensile test device and method applying same |
| CN205656070U (en) * | 2016-04-05 | 2016-10-19 | 西南交通大学 | Fibre tensile testing device |
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