CN101776553A - Geosynthetic biaxial tension creep tester - Google Patents
Geosynthetic biaxial tension creep tester Download PDFInfo
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- CN101776553A CN101776553A CN201019026078A CN201019026078A CN101776553A CN 101776553 A CN101776553 A CN 101776553A CN 201019026078 A CN201019026078 A CN 201019026078A CN 201019026078 A CN201019026078 A CN 201019026078A CN 101776553 A CN101776553 A CN 101776553A
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Abstract
The invention provides a geosynthetic biaxial tension creep tester. The tester comprises a main frame platform and a cross-shaped tensile testing device arranged on the main frame platform, wherein the cross-shaped tensile testing device comprises four groups of clamping devices, four groups of guiding devices, four groups of displacement sensors and four force-applying devices; the clamping devices are used to clamp the four edges of a test-piece placed in the middle of the cross-shaped tensile testing device and separately connected with the four force-applying devices arranged at the four ends of the cross-shaped tensile testing device through steel cables; the four groups of clamping devices can slide to the force-applying devices separately along the four groups of guiding devices; and the displacement sensors are separately arranged between the clamping devices and the force-applying devices. The geosynthetic biaxial tension creep tester of the invention can be used to perform creep test in any complex stress-strain loading path under the action of biaxial tensile loading, and compared with the easy uniaxial tension test, the creep test is more similar to the actual stress-strain state in engineers.
Description
Technical field
The present invention relates to a kind of geosynthetic biaxial tension creep performance testing device, belong to the material property testing technical field.
Background technology
At present, test for geosynthetics creep mechanical property, adopt simple one directional tensile test to carry out always, its test findings and the material true stress strain regime in engineering is used differs bigger, can't be used for reflecting exactly the creep mechanical property of geosynthetics under long-term tensile load effect.
In the tension test of the plate shell class material of near field, the experimental technique that carries out two-way stretch is arranged, wherein, the cruciform pulling method is the most directly perceived, the most reliable a kind of, can directly reflect the method for plate shell class material biaxial stress state.The cruciform tensile test apparatus mainly contains two kinds of mechanical type and fluid pressure types.The mechanical biaxial tension test unit mainly is to come load application by means of universal testing machine, can't realize the stretching of any ess-strain ratio of twin shaft, and the device range of stretch is less, can only do the small deformation tension test, is not suitable for the test under the geosynthetics generation large deformation situation.The fluid pressure type bidirectional tensile tester applies the tensile load of twin shaft by hydrostatic control, and hydrostatic control will keep the twin shaft pulling force to equate or proportional very difficulty, when especially carrying out little tonnage tension test, can produce than mistake; In addition, when carrying out the long creep test of material, hydraulic-driven can not guarantee the long-time stability and the reliability of tensile load.
The geosynthetics creep test need adopt bigger specimen size to eliminate the influence of boundary effect usually, geosynthetics mostly is flexible material and easily produces moderate finite deformation when stretching in addition, therefore require test unit that very large-scale stretching space is arranged, the mechanical biaxial tension test unit can't be realized the creep test of bulk specimen large deformation.The geosynthetics deformation modulus is less, the general tensile load that only needs little tonnage, can produce than mistake when using the fluid pressure type bidirectional tensile tester during little tonnage tension test, and the geosynthetics creep test is lasted and is reached the several months, and hydraulic-driven can not guarantee the long-time stability and the reliability of tensile load.Therefore, the biaxial tension tester device of existing plate shell class material all can't directly be used for carrying out the biaxial tension creep test of geosynthetics.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of high efficiency, stable performance are provided, can satisfy the tester of two-way stretch large deformation creep test under the complex stress strain paths.
The object of the present invention is achieved like this: geosynthetic biaxial tension creep tester, comprise mainframe platform and the cruciform tensile test apparatus that is arranged on the described mainframe platform, the cruciform sample is positioned at the platform center, it is characterized in that: described cruciform tensile test apparatus comprises clamping device, guide piece, displacement transducer and force application apparatus, described clamping device is four groups, four limits that are placed on the middle test specimen of described cruciform tensile test apparatus in clamping, and are connected by the force application apparatus of cable wire with four ends that are arranged on described cruciform tensile test apparatus respectively; Described guide piece is four groups, and under the traction of pulling force load, four groups of clamping devices can slide to the force application apparatus direction along four assembly guidances respectively; Described displacement transducer is four groups, be separately positioned between described clamping device and the described force application apparatus, an end of displacement transducer links to each other with strap, is used for measuring the stretching displacement of sample, the other end of displacement transducer is connected on the force application apparatus, and sample is applied tensile load.Simple, the easy row of this loading method has higher stability and reliability than applying mode with hydraulic pressure and motor-driven load in long time creep test.
The anchor clamps that can select any routine for use of the clamping device among the present invention, preferred version is: every group of clamping device comprises strap and ambulatory splint, passes through bolt anchoring.
In order to make sample stressed even in clamping, the folder mouth of described strap and described ambulatory splint is a sinusoidal waveform.
Among the present invention, every assembly guidance comprises the roller that is arranged on corresponding clamping device bottom by the roller axle bed, and the guide rail that cooperates with roller.Roller in every assembly guidance is two, is symmetricly set on the both sides of every group of clamping device bottom; Described guide rail is two, and is parallel each other.Under the midplane extrusion load action, roller will roll along two guide rails, draw sample and be out of shape on two major axes orientations, and the position at sample center remains unchanged.
Every group of displacement transducer links to each other by data line and acquisition instrument and computing machine that data acquisition software is housed.When carrying out the creep test of material, data acquisition time is long at interval, can directly read on the data acquisition instrument.When carrying out the instantaneous biaxial tensile test of material, data acquisition time is shorter at interval, the data acquisition instrument can be connected to the data acquisition software in the computing machine, software can be gathered real-time displacement automatically, and draws stress strain curve according to the drawing stress that applies.
Described force application apparatus comprises pulley blocks and counterweight, and cable wire is connected with counterweight after walking around pulley blocks lower bearing and pulley blocks head bearing.Realize any stress ratio of twin shaft by the counterweight weight that changes both direction, vertical Weight gravity is transformed into level on the platform to pulling force by the deflection sheave group.The deflection sheave group realized drawing stress from vertically to level to transformation, thereby for sample level to large deformation more space is provided, can reduce the planar dimension of platform like this.Be more suitable for carrying out the big denatured test of geosynthetics at the tensile test apparatus of same direction than tensile load and sample deformation.
In order to make sample keep strain ratio arbitrarily at biaxially oriented, realize the two-way stretch under any complex stress strain paths, when needing in test sample deformation to reach any extensibility stretching is braked, thereby on pulley blocks, be provided with clamping device.
Clamping device among the present invention can adopt any suitable clamping device general in this area, preferred version is: described clamping device comprises brake disc and eccentric brake handle, described brake disc by on the wheel shaft that is enclosed within the pulley blocks head bearing and two circular steel disks that encase the bearing outer form, be provided with spring between two steel disks and make and do not draw close fully in the outer of pulley blocks head bearing but leave slit, described eccentric brake handle is arranged on the end of pulley blocks head bearing according to conventional method.Cable wire is walked around pulley blocks head bearing outer and is arranged in two slits between steel disk, and when upwards pulling eccentric brake handle, the spring between two steel disks is compressed, and cable wire is just drawn close and compress to two steel disks mutually, thereby realize braking.When pulling eccentric brake handle downwards, the recoil of spring between two steel disks, two steel disks separately, cable wire can move freely around bearing, the hardness of two steel disk materials is less than the hardness of cable wire, in order to avoid in the braking cable wire is caused damage.This brake switch is braked stretching when sample deformation reaches any extensibility in test.
For making full use of the space, improve creep test efficient, described mainframe platform is a upper, middle and lower-ranking, three platforms are the quadra structure about the sample symmetry, every layer of platform size and structural arrangement are identical, and the rail length on three layers of platform reduces successively, makes full use of the space, can carry out three groups of tests simultaneously, not disturb mutually.Three layers of platform are the quadra structure that angle steel is formed by connecting.
Before test, to check tensile load.The cable wire of transmission tensile load can produce friction force when being wrapped on the pulley blocks, also has certain friction force between roller in sample holder and the guide piece and the guide rail.Can eliminate the error that two kinds of friction force are brought in the following way.At first replace sample, be connected on two anchor clamps on the same direction, then, apply the counterweight of Different Weight, obtain the true tensile force under the various counterweight correspondences with displacement transducer.So can obtain relation curve corresponding between counterweight weight and the tensile force.The tensile force that can apply as required in the test is selected corresponding counterweight weight.
During test, at first sample is installed in the test platform center,, makes sample be in incipient extension state in the plane, and the pulley blocks on the four direction is all braked applying counterweight in a small amount.Tensile force as required applies the counterweight of corresponding weight then, and opens the data acquisition system (DAS) opening entry.The last brake switch of opening all directions is simultaneously realized two-way stretch.By selecting the counterweight weight ratio on the both direction can realize different drawing stress ratios; By selecting sample on both direction, to reach a certain displacement than constantly coming the brake sheave group can realize different strain ratioes.
Beneficial effect of the present invention is:
1, apparatus of the present invention can realize carrying out under the two-way stretch load action creep test under any complex stress strain load path, compared with simple one directional tensile test more near the stress-strain state in the engineering reality.
2, apparatus of the present invention make full use of mainframe platform solid space, three layers of platform are set can carry out three groups of tests simultaneously, do not disturb mutually, efficiently solve creep test length consuming time, and efficient is hanged down problem.
3, tensile load uses counterweight to apply in apparatus of the present invention, rather than loads with hydraulic pressure or motor-driven stress, in long creep test, guarantees that tensile load has higher long-time stability and reliability like this.
4, apparatus of the present invention utilize deflection sheave device that vertical Weight gravity load is transformed into horizontal stretch pulling force on the platform, make sample have bigger stretcher strain space, are fit to carry out the large deformation biaxial tensile test of geosynthetics.
Description of drawings
Fig. 1 is apparatus of the present invention front view.
Fig. 2 is apparatus of the present invention vertical view.
Fig. 3 is clamping part and a guide piece partial schematic diagram in apparatus of the present invention.
Fig. 4 is clamping part and a guide piece partial top view in apparatus of the present invention.
Fig. 5 is DATA REASONING and a harvester structural representation in apparatus of the present invention.
Fig. 6 is a force application apparatus structural representation in apparatus of the present invention.
Fig. 7 is a brake device structure synoptic diagram in apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the mode by embodiment is elaborated to technical solution of the present invention, but protection scope of the present invention is not limited to described embodiment.
Geosynthetic biaxial tension creep tester, comprise mainframe platform 1 and the cruciform tensile test apparatus 2 that is arranged on the described mainframe platform 1, described mainframe platform 1 is three layers, every layer of platform size and structural arrangement are identical, and described cruciform tensile test apparatus 2 comprises clamping device 3, guide piece 4, displacement transducer 5 and force application apparatus 6;
Described clamping device 4 is four groups, and every group of clamping device 3 comprises strap 9 and ambulatory splint 10, by bolt 11 anchorings; The folder mouth of described strap 9 and described ambulatory splint 10 is a sinusoidal waveform; Four limits of the test specimen 7 that is placed on described cruciform tensile test apparatus 2 centres in clamping device 4 clampings, and are connected by the force application apparatus 6 of cable wire 8 with four ends that are arranged on described cruciform tensile test apparatus 2 respectively;
Described guide piece 4 is four groups, and four groups of clamping devices 3 can slide to force application apparatus 6 directions along four assembly guidances 4 respectively; Every assembly guidance 4 comprises the roller 13 that is arranged on corresponding clamping device bottom by roller axle bed 12, and the guide rail 14 that cooperates with roller 13; Roller 13 in every assembly guidance is two, is symmetricly set on the both sides of strap 9 bottoms; Described guide rail 14 is two, and is parallel each other;
Described displacement transducer 5 is four groups, is separately positioned between described clamping device 3 and the described force application apparatus 6; Every group of displacement transducer 5 links to each other by data line 15 and acquisition instrument 16 and computing machine 17 that data acquisition software is housed;
Described force application apparatus comprises pulley blocks 18,19 and counterweight 20, and cable wire 8 is walked around pulley blocks lower bearing 18 and is connected with counterweight 20 with pulley blocks head bearing 19 backs; Pulley blocks 18, also be provided with clamping device on 19, described clamping device comprises brake disc 21 and eccentric brake handle 22, described brake disc 21 by on the wheel shaft that is enclosed within pulley blocks head bearing 19 and two circular steel disks that encase the bearing outer form, be provided with spring between two steel disks and make and do not draw close fully in the outer of pulley blocks head bearing but leave slit, described eccentric brake handle 22 is arranged on the end of pulley blocks head bearing 19.
Claims (10)
1. geosynthetic biaxial tension creep tester, comprise mainframe platform (1) and be arranged on cruciform tensile test apparatus (2) on the described mainframe platform (1), it is characterized in that: described cruciform tensile test apparatus (2) comprises clamping device (3), guide piece (4), displacement transducer (5) and force application apparatus (6), described clamping device (4) is four groups, four limits that are placed on the middle test specimen (7) of described cruciform tensile test apparatus (2) in clamping, and are connected with the force application apparatus (6) of four ends that are arranged on described cruciform tensile test apparatus (2) by cable wire (8) respectively; Described guide piece (4) is four groups, and four groups of clamping devices (3) can slide to force application apparatus (6) direction along four assembly guidances (4) respectively; Described displacement transducer (5) is four groups, is separately positioned between described clamping device (3) and the described force application apparatus (6).
2. geosynthetic biaxial tension creep tester according to claim 1 is characterized in that: every group of clamping device (3) comprises strap (9) and ambulatory splint (10), by bolt (11) anchoring.
3. geosynthetic biaxial tension creep tester according to claim 2 is characterized in that: the folder mouth of described strap (9) and described ambulatory splint (10) is a sinusoidal waveform.
4. geosynthetic biaxial tension creep tester according to claim 1, it is characterized in that: every assembly guidance (4) comprises the roller (13) that is arranged on corresponding clamping device bottom by roller axle bed (12), and the guide rail (14) that cooperates with roller (13).
5. geosynthetic biaxial tension creep tester according to claim 4 is characterized in that: the roller in every assembly guidance (13) is two, is symmetricly set on the both sides of every group of clamping device (4) bottom; Described guide rail (14) is two, and is parallel each other.
6. geosynthetic biaxial tension creep tester according to claim 1 is characterized in that: every group of displacement transducer (5) links to each other by data line (15) and acquisition instrument (16) and computing machine (17) that data acquisition software is housed.
7. geosynthetic biaxial tension creep tester according to claim 1, it is characterized in that: described force application apparatus comprises pulley blocks (18,19) and counterweight (20), cable wire (8) is walked around pulley blocks lower bearing (18) and is connected with counterweight (20) with pulley blocks head bearing (19) back.
8. geosynthetic biaxial tension creep tester according to claim 7 is characterized in that: pulley blocks also is provided with clamping device on (18,19).
9. geosynthetic biaxial tension creep tester according to claim 8, it is characterized in that: described clamping device comprises brake disc (21) and eccentric brake handle (22), described brake disc (21) by on the wheel shaft that is enclosed within pulley blocks head bearing (19) and two circular steel disks that encase the bearing outer form, be provided with spring between two steel disks and make and do not draw close fully in the outer of pulley blocks head bearing but leave slit, described eccentric brake handle (22) is arranged on the end of pulley blocks head bearing (19).
10. according to the described geosynthetic biaxial tension creep tester of arbitrary claim in the claim 1～9, it is characterized in that: described mainframe platform (1) is three layers, and every layer of platform size and structural arrangement are identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201019026078XA CN101776553B (en) | 2010-02-05 | 2010-02-05 | Geosynthetic biaxial tension creep tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201019026078XA CN101776553B (en) | 2010-02-05 | 2010-02-05 | Geosynthetic biaxial tension creep tester |
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| CN101776553A true CN101776553A (en) | 2010-07-14 |
| CN101776553B CN101776553B (en) | 2012-04-11 |
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| CN201019026078XA Expired - Fee Related CN101776553B (en) | 2010-02-05 | 2010-02-05 | Geosynthetic biaxial tension creep tester |
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| CN102005154A (en) * | 2010-10-19 | 2011-04-06 | 浙江大学 | Gradual cumulative damage simulation and demonstration instrument |
| CN102183414A (en) * | 2011-03-24 | 2011-09-14 | 同济大学 | Device for performing tensile test on geosynthetics in soil |
| CN102252909A (en) * | 2011-04-22 | 2011-11-23 | 上海交通大学 | Extension testing device |
| CN102353578A (en) * | 2011-09-30 | 2012-02-15 | 上海交通大学 | Testing device for two-way loading test of material |
| CN102980812A (en) * | 2012-11-08 | 2013-03-20 | 沈阳工业大学 | Reusable creeping device for changing stretch into compression |
| CN102998134A (en) * | 2012-11-21 | 2013-03-27 | 陈伟 | Dynamic load tester of electric warming pad |
| CN103398902A (en) * | 2013-08-01 | 2013-11-20 | 山东大学 | Test apparatus for flexible loading and instantaneously unloading of high geostress, and test method |
| CN103674509A (en) * | 2013-10-23 | 2014-03-26 | 芜湖市顺昌汽车配件有限公司 | Method for measuring loading capacity of clamp mechanism |
| CN104697855A (en) * | 2014-08-20 | 2015-06-10 | 南京大学（苏州）高新技术研究院 | Device and method for measuring fiber drawing creep |
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| CN108645712A (en) * | 2018-04-26 | 2018-10-12 | 石家庄铁道大学 | Geosynthetics tensile test apparatus based on soil medium |
| CN109374404A (en) * | 2018-11-02 | 2019-02-22 | 河海大学 | A kind of sample preparation device, method and the test method of geotechnique's tension test |
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2010
- 2010-02-05 CN CN201019026078XA patent/CN101776553B/en not_active Expired - Fee Related
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| CN102005154B (en) * | 2010-10-19 | 2011-12-21 | 浙江大学 | Gradual cumulative damage simulation and demonstration instrument |
| CN102005154A (en) * | 2010-10-19 | 2011-04-06 | 浙江大学 | Gradual cumulative damage simulation and demonstration instrument |
| CN102183414A (en) * | 2011-03-24 | 2011-09-14 | 同济大学 | Device for performing tensile test on geosynthetics in soil |
| CN102183414B (en) * | 2011-03-24 | 2012-08-22 | 同济大学 | Device for performing tensile test on geosynthetics in soil |
| CN102252909A (en) * | 2011-04-22 | 2011-11-23 | 上海交通大学 | Extension testing device |
| CN102353578A (en) * | 2011-09-30 | 2012-02-15 | 上海交通大学 | Testing device for two-way loading test of material |
| CN102980812B (en) * | 2012-11-08 | 2015-10-21 | 沈阳工业大学 | A kind of reusable by the creep device transferring compression to that stretches |
| CN102980812A (en) * | 2012-11-08 | 2013-03-20 | 沈阳工业大学 | Reusable creeping device for changing stretch into compression |
| CN102998134A (en) * | 2012-11-21 | 2013-03-27 | 陈伟 | Dynamic load tester of electric warming pad |
| CN103398902A (en) * | 2013-08-01 | 2013-11-20 | 山东大学 | Test apparatus for flexible loading and instantaneously unloading of high geostress, and test method |
| CN103398902B (en) * | 2013-08-01 | 2015-04-22 | 山东大学 | Test apparatus for flexible loading and instantaneously unloading of high geostress, and test method |
| CN103674509A (en) * | 2013-10-23 | 2014-03-26 | 芜湖市顺昌汽车配件有限公司 | Method for measuring loading capacity of clamp mechanism |
| CN104697855A (en) * | 2014-08-20 | 2015-06-10 | 南京大学（苏州）高新技术研究院 | Device and method for measuring fiber drawing creep |
| CN104697855B (en) * | 2014-08-20 | 2017-07-14 | 南京大学（苏州）高新技术研究院 | A kind of fibne pull-out creep test device and its method of testing |
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| CN105181460A (en) * | 2015-09-26 | 2015-12-23 | 哈尔滨工程大学 | Creep testing machine capable of achieving simultaneous multi-level loading |
| CN108645712A (en) * | 2018-04-26 | 2018-10-12 | 石家庄铁道大学 | Geosynthetics tensile test apparatus based on soil medium |
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| CN109932246A (en) * | 2019-04-22 | 2019-06-25 | 桂林电子科技大学 | A kind of geosynthetics press creep test device |
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| CN110595658A (en) * | 2019-09-27 | 2019-12-20 | 浙江工业大学 | Residual stress introducing device capable of keeping central position motionless |
| CN110728913A (en) * | 2019-10-31 | 2020-01-24 | 上海天马有机发光显示技术有限公司 | Display device |
| CN110728913B (en) * | 2019-10-31 | 2021-08-27 | 上海天马有机发光显示技术有限公司 | Display device |
| CN110658078A (en) * | 2019-11-25 | 2020-01-07 | 中国人民解放军火箭军工程大学 | Biaxial load adjustable tensile creep testing device and method |
| CN111307593A (en) * | 2020-04-04 | 2020-06-19 | 南京理工大学 | Testing arrangement suitable for two-way creep performance of flexible membrane material |
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