CN103528890B - A kind of three-point bending beam test unit - Google Patents
A kind of three-point bending beam test unit Download PDFInfo
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- CN103528890B CN103528890B CN201310552574.5A CN201310552574A CN103528890B CN 103528890 B CN103528890 B CN 103528890B CN 201310552574 A CN201310552574 A CN 201310552574A CN 103528890 B CN103528890 B CN 103528890B
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- 238000012360 testing method Methods 0.000 title claims abstract description 91
- 238000013001 point bending Methods 0.000 title claims abstract description 27
- 238000009434 installation Methods 0.000 claims abstract description 76
- 230000007246 mechanism Effects 0.000 claims abstract description 57
- 239000000463 material Substances 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
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- 238000012512 characterization method Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The present invention relates to a kind of three-point bending beam test unit, comprise the first installing mechanism of the end for installation testing test specimen, for installing second installing mechanism of the other end of described test specimen, the loaded member that one end is fixedly connected with described second installing mechanism, be fixedly connected with described first installing mechanism and the limited block be slidably connected with described second installing mechanism, described limited block offers groove along its length, described second installing mechanism is positioned at described groove and slides along described groove, the other end of described loaded member passes described limited block and arranges slidably with described limited block, described first installing mechanism is at the central plane of Width, described second installing mechanism is at the central plane of Width, described limited block in the central plane of Width and described loaded member in the equal isoplanar of the central plane of Width.What three-point bending beam test unit of the present invention can realize under middle and high rate of strain tension test adds unloading continuously.
Description
Technical field
The present invention relates generally to a kind of three-point bending beam test unit, belongs to material mechanical performance testing and characterization field, for the industry such as automobile, aviation.
Background technology
In the mechanical test of the vehicle materials such as high-strength steel, macromolecular material, plastics, often need the uninstall feature of test material.At present, for the test of material uninstall feature, normally realizing closed-loop control by motor, the electronic universal tester that can realize adding continuously unloading completes.But electronic universal tester can only realize quasistatic or compared with the test under low strain dynamic rate.In reality, for vehicle materials such as high-strength steel, macromolecular material, plastics, what we more needed concern is then the mechanical characteristic of material under middle and high rate of strain loads.And for the middle and high fast cupping machine of middle and high rate of strain loading can be realized, be generally hydraulic system, carry out unidirectional loading by opened loop control, be difficult to realize adding unloading continuously.
Summary of the invention
Technical matters to be solved by this invention overcomes the deficiencies in the prior art, provides the three-point bending beam test unit that a kind of structure is simple, can realize adding continuously unloading under middle and high rate of strain.
For solving above technical matters, the present invention adopts following technical scheme:
A kind of three-point bending beam test unit, comprise the first installing mechanism of the end for installation testing test specimen, for installing second installing mechanism of the other end of described test specimen, the loaded member that one end is fixedly connected with described second installing mechanism, be fixedly connected with described first installing mechanism and the limited block be slidably connected with described second installing mechanism, described limited block offers groove along its length, described second installing mechanism is positioned at described groove and slides along described groove, the other end of described loaded member passes described limited block and arranges slidably with described limited block, described first installing mechanism is at the central plane of Width, described second installing mechanism is at the central plane of Width, described limited block in the central plane of Width and described loaded member in the equal isoplanar of the central plane of Width.
Described first installing mechanism comprises the first installation portion, described first installation portion offers the first mounting groove of the end for placing described test specimen along its length, in an end of described first installation portion the center line being positioned at described first installation portion Width offers the first breach, described first breach is communicated with described first mounting groove, the width of described first breach is less than the width of described first mounting groove, described first installing mechanism also comprises the first cover plate be arranged on above described first mounting groove, described first cover plate is close to the surface of described first installation portion and is fixedly connected with described first installation portion by multiple first securing member.
One end of described first installation portion is fixedly connected with described limited block, joint pin is arranged with in two sides of an end of described first installation portion, described limited block is offering connecting hole with the corresponding position of described joint pin, described joint pin has external thread, described joint pin is provided with nut, and described first installation portion is connected with described limited block with described nut through described connecting hole by described joint pin successively.
The two side faces that described limited block is symmetrical offers threaded hole, and described threaded hole is communicated with described connecting hole, is provided with the bolt for being fixedly connected with described joint pin by described limited block in described threaded hole.
Described two side faces offers multiple threaded hole along the length direction of described limited block, and each described threaded hole correspondence is provided with a bolt.
Described first installing mechanism also comprise be arranged between described first cover plate and an end of described test specimen for eliminate the gap between an end of described test specimen and described first cover plate the first pad, be arranged on bottom described first mounting groove for adjusting second pad of an end in described first mounting groove short transverse position of described test specimen.
Described second installing mechanism comprises the second installation portion, described second installation portion offers second mounting groove of the other end for placing described test specimen along its length, in an end of described second installation portion the center line being positioned at described second installation portion Width offers the second breach, described second breach is communicated with described second mounting groove, the width of described second breach is less than the width of described second mounting groove, described second installing mechanism also comprises the second cover plate be arranged on above described second mounting groove, described second cover plate is close to the surface of described second installation portion and is fixedly connected with described second installation portion by multiple second securing member.
Described second installation portion is fixedly connected with described loaded member, the one end part of described loaded member is in described second mounting groove, in the other end of described second installation portion the center line being positioned at described second installation portion Width offers the 3rd breach, described 3rd breach is communicated with described two mounting grooves, the width of described 3rd breach is less than the width of described second mounting groove, and described second installation portion is stretched out from described 3rd breach in the other end of described loaded member.
Described second installing mechanism also comprise be arranged between described second cover plate and the other end of described test specimen for eliminate the gap between the other end of described test specimen and described second cover plate the 3rd pad, be arranged on bottom described second mounting groove for adjusting four pad of the other end in described second mounting groove short transverse position of described test specimen.
Symmetrical two side faces on the position be not connected with described second installing mechanism of described loaded member offers the 4th breach.
Due to the enforcement of technique scheme, the present invention compared with prior art tool has the following advantages:
Three-point bending beam test unit of the present invention not only can realize the discharge mechanism of controlled displacement by the link position arranging limited block and the first installing mechanism for different materials for test, also can remove limited block, is reduced to simple power and controls discharge mechanism.
What three-point bending beam test unit of the present invention achieved tension test under middle and high rate of strain adds unloading continuously.
Three-point bending beam test unit structure of the present invention is simple, easy to operate, low cost of manufacture.
Accompanying drawing explanation
Fig. 1 is the front elevational schematic of three-point bending beam test unit of the present invention;
Fig. 2 be in Fig. 1 A-A to cross-sectional schematic;
Fig. 3 is that schematic diagram is looked on a left side for three-point bending beam test unit of the present invention;
Fig. 4 is axle schematic side view such as the grade (not showing test specimen and cover plate) of three-point bending beam test unit of the present invention;
In figure: 1, the first installation portion; 2, the first cover plate; 3, the first securing member; 4, the first breach; 5, the first mounting groove; 6, joint pin; 7, test specimen; 8, the second installation portion; 9, the second breach; 10, the second mounting groove; 11, the second cover plate; 12, the second securing member; 13, the 3rd breach; 14, limited block; 15, groove; 16, nut; 17, bolt; 18, loaded member; 19, the 4th breach; 20, the first pad; 21, the second pad; 22, the 3rd pad; 23, the 4th pad; 24, lug boss.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.
As shown in accompanying drawing 1 ~ 4, a kind of three-point bending beam test unit, comprise the first installing mechanism of the end for installation testing test specimen 7, for installing second installing mechanism of the other end of test specimen 7, the loaded member 18 that one end is fixedly connected with the second installing mechanism, be fixedly connected with the first installing mechanism and the limited block 14 be slidably connected with the second installing mechanism, limited block 14 offers groove 15 along its length, second installing mechanism is positioned at groove 15 and slides along groove 15, the other end of loaded member 18 passes limited block 14 and arranges slidably with limited block 14, first installing mechanism is at the central plane of Width, second installing mechanism is at the central plane of Width, limited block 14 in the central plane of Width and loaded member 18 in the equal isoplanar of the central plane of Width.Groove 15 is connected near the external world of one end of the first installing mechanism with limited block 14, and the other end of groove 15 has limiting section, and limiting section offers through hole, and limited block 14 is stretched out from this through hole in the other end of loaded member 18.
In the present embodiment, first installing mechanism comprises the first installation portion 1, first installation portion 1 offers the first mounting groove 5 of the end for placing test specimen 7 along its length, in an end of the first installation portion 1 and the width center line being positioned at the first installation portion 1 Width offering the first breach 4, first breach 4 is less than the width of the first mounting groove 5.The part of test specimen 7 stretches out the first installation portion 1 from the first breach 4.First installing mechanism is also comprised the first cover plate 2, first cover plate 2 be arranged on above the first mounting groove 5 and is close to the surface of the first installation portion 1 and is fixedly connected with the first installation portion 1 by multiple first securing member 3.
When specifically arranging, one end of the first installation portion 1 is fixedly connected with limited block 14, joint pin 6 is arranged with in two sides of an end of the first installation portion 1, limited block 14 offers connecting hole in the position corresponding with joint pin 6, joint pin 6 has external thread, joint pin 6 is provided with nut 16, and the first installation portion 1 is connected with limited block 14 with nut 16 through connecting hole by joint pin 6 successively.In order to make the connection between limited block 14 and the first installation portion 1 more stable, threaded hole is offered at limited block 14 symmetrical two side faces along its length, threaded hole is communicated with connecting hole, is provided with the bolt 17 for being fixedly connected with joint pin 6 by limited block 14 in threaded hole.Two side faces offers multiple threaded hole along the length direction of limited block 14, and each threaded hole correspondence is provided with a bolt.Particularly, each side is provided with 3 threaded holes.In order to this three-point bending beam test unit is more convenient for using, the other end of first installation portion 1 is provided with the lug boss 24 extended along the first installation portion 1 length direction, better, the width of the width of lug boss 24 and thickness and loaded member 18 and consistency of thickness, and be positioned on the extended line of loaded member 18 length direction.
First installing mechanism also comprise be arranged between the first cover plate 2 and an end of test specimen 7 for eliminate the gap between an end of test specimen 7 and the first cover plate 2 the first pad 20, be arranged on bottom the first mounting groove 5 for adjusting second pad 21 of an end in the first mounting groove 5 short transverse position of test specimen 7.
In the present embodiment, second installing mechanism comprises the second installation portion 8, second installation portion 8 offers second mounting groove 10 of the other end for placing test specimen 7 along its length, in an end of the second installation portion 8 center line being positioned at the second installation portion 8 Width offers the second breach 9, second breach 9 is communicated with the second mounting groove 10, and the width of the second breach 9 is less than the width of the second mounting groove 10.The part of test specimen 7 stretches out the second installation portion 8 from the second breach 9.Second installing mechanism is also comprised the second cover plate 11, second cover plate 11 be arranged on above the second mounting groove 10 and is close to the surface of the second installation portion 8 and is fixedly connected with the second installation portion 8 by multiple second securing member 12.
When specifically arranging, second installation portion 8 is fixedly connected with loaded member 18, the one end part of loaded member 18 is in the second mounting groove 10, in the other end of the second installation portion 8 center line being positioned at the second installation portion 8 Width offers the 3rd breach 13,3rd breach 13 is communicated with the second mounting groove 10, the width of the 3rd breach 13 is less than the width of the second mounting groove 10, and the second installation portion 8 is stretched out from the 3rd breach 13 in the other end of loaded member 18.
Second installing mechanism also comprise be arranged between the second cover plate 11 and test specimen 7 for eliminate the gap between the other end of test specimen 7 and the second cover plate 11 the 3rd pad 22, be arranged on bottom the second mounting groove 10 for adjusting four pad 23 of the other end in the second mounting groove 10 short transverse position of test specimen 7.
In the present embodiment, the symmetrical two side faces at the position be not connected with the second installing mechanism of loaded member 18 offers the 4th breach 19.Particularly, the 4th breach 19 symmetry offers 2.
In the present embodiment, the notch homonymy of groove 15, first mounting groove 5 and the second mounting groove 10 three.
When the present invention specifically uses, the process thickness of test specimen 7 and the thickness stack pile of loaded member 18, select the first pad 20, second pad 21, the 3rd pad 22 and the 4th pad 23, first an end of the first pad 20, test specimen 7 and the second pad 21 are put into the first mounting groove 5 successively, the center section of test specimen 7 stretches out the first installation portion 1 from the first breach 4, is then locked by the first securing member 3 and the first installation portion 1 by the first cover plate 2.Then the other end of the 3rd pad 22, test specimen 7, an end of loaded member 18 and the 4th pad 23 are put into the second mounting groove 10 successively, and is alignd in the other end of an end of loaded member 18 and test specimen 7, then the second cover plate 11 is locked by the second securing member 12 and the second installation portion 8.Then by joint pin 6 through connecting hole, allow the second installation portion 8 slip in groove 15 and allow the other end of loaded member 18 stretch out limited block 14 from the through hole in limited block 14 upper limit portion.Then the link position of adjustment limited block 14 and joint pin 6, screws on nut 16 and limited block 14 is fixed by bolt 17.In installation process, the central plane of loaded member 18 thickness direction need with the central plane coplanar of test specimen 7 thickness direction.
When measuring the unloading of test specimen 7, be installed on testing machine by three-point bending beam device of the present invention and test, particularly, be fixed in tester base by lug boss 24, the other end of loaded member 18 is fixed on the loading chuck of testing machine.When loaded member 18 is subject to loading, loading force will be transmitted to test specimen 7 by the second installation portion 8, and realize loading.When the first installation portion 8 rises to given displacement, due to the restriction of limited block 14, the second installation portion 8 stops rising, and test specimen 7 keeps former stress.On the other hand, along with the further increase of loading force, will there is fracture at the 4th breach 19 place in loaded member 18, thus realize the unloading to test specimen 7.
The loaded member 18 of three-point bending beam test unit of the present invention can control unloading force by adopting the 4th different breach 19 sizes, and the size of the 4th breach 19 can obtain the pulling strengrth of this material under different breach size by the tension test of a certain amount of breach size determines.
Three-point bending beam test unit of the present invention can be Bit andits control unloading, namely the sliding distance of the second installation portion 8 is controlled by the link position of limited block 14 on joint pin 6, when making test specimen 7 be stretched to certain displacement, test specimen 7 is no longer stretched, and loaded member 18 proceeds to stretch, last loaded member 18 ruptures and realizes unloading; Also can be that power controls unloading, namely remove limited block 14, the size near the 4th breach 19 in loaded member 18 controls the size of unloading force.
Above to invention has been detailed description; its object is to allow the personage being familiar with this art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; and the invention is not restricted to the embodiments described; the equivalence change that all Spirit Essences according to the present invention are done or modification, all should be encompassed within protection scope of the present invention.
Claims (10)
1. a three-point bending beam test unit, it is characterized in that, comprise the first installing mechanism of the end for installation testing test specimen, for installing second installing mechanism of the other end of described test specimen, the loaded member that one end is fixedly connected with described second installing mechanism, be fixedly connected with described first installing mechanism and the limited block be slidably connected with described second installing mechanism, described limited block offers groove along its length, described second installing mechanism is positioned at described groove and slides along described groove, the other end of described loaded member passes described limited block and arranges slidably with described limited block, described first installing mechanism is at the central plane of Width, described second installing mechanism is at the central plane of Width, described limited block in the central plane of Width and described loaded member in the equal isoplanar of the central plane of Width.
2. three-point bending beam test unit according to claim 1, it is characterized in that, described first installing mechanism comprises the first installation portion, described first installation portion offers the first mounting groove of the end for placing described test specimen along its length, in an end of described first installation portion the center line being positioned at described first installation portion Width offers the first breach, described first breach is communicated with described first mounting groove, the width of described first breach is less than the width of described first mounting groove, described first installing mechanism also comprises the first cover plate be arranged on above described first mounting groove, described first cover plate is close to the surface of described first installation portion and is fixedly connected with described first installation portion by multiple first securing member.
3. three-point bending beam test unit according to claim 2, it is characterized in that, one end of described first installation portion is fixedly connected with described limited block, joint pin is arranged with in two sides of an end of described first installation portion, described limited block is offering connecting hole with the corresponding position of described joint pin, described joint pin has external thread, described joint pin is provided with nut, and described first installation portion is connected with described limited block with described nut through described connecting hole by described joint pin successively.
4. three-point bending beam test unit according to claim 3, it is characterized in that, the two side faces that described limited block is symmetrical offers threaded hole, and described threaded hole is communicated with described connecting hole, is provided with the bolt for being fixedly connected with described joint pin by described limited block in described threaded hole.
5. three-point bending beam test unit according to claim 4, is characterized in that, described two side faces offers multiple threaded hole along the length direction of described limited block, and each described threaded hole correspondence is provided with a bolt.
6. three-point bending beam test unit according to claim 2, it is characterized in that, described first installing mechanism also comprise be arranged between described first cover plate and an end of described test specimen for eliminate the gap between an end of described test specimen and described first cover plate the first pad, be arranged on bottom described first mounting groove for adjusting second pad of an end in described first mounting groove short transverse position of described test specimen.
7. unloading test device according to claim 1, it is characterized in that, described second installing mechanism comprises the second installation portion, described second installation portion offers second mounting groove of the other end for placing described test specimen along its length, in an end of described second installation portion the center line being positioned at described second installation portion Width offers the second breach, described second breach is communicated with described second mounting groove, the width of described second breach is less than the width of described second mounting groove, described second installing mechanism also comprises the second cover plate be arranged on above described second mounting groove, described second cover plate is close to the surface of described second installation portion and is fixedly connected with described second installation portion by multiple second securing member.
8. three-point bending beam test unit according to claim 7, it is characterized in that, described second installation portion is fixedly connected with described loaded member, the one end part of described loaded member is in described second mounting groove, in the other end of described second installation portion the center line being positioned at described second installation portion Width offers the 3rd breach, described 3rd breach is communicated with described two mounting grooves, the width of described 3rd breach is less than the width of described second mounting groove, and described second installation portion is stretched out from described 3rd breach in the other end of described loaded member.
9. three-point bending beam test unit according to claim 7, it is characterized in that, described second installing mechanism also comprise be arranged between described second cover plate and the other end of described test specimen for eliminate the gap between the other end of described test specimen and described second cover plate the 3rd pad, be arranged on bottom described second mounting groove for adjusting four pad of the other end in described second mounting groove short transverse position of described test specimen.
10. three-point bending beam test unit according to claim 1, is characterized in that, the symmetrical two side faces on the position be not connected with described second installing mechanism of described loaded member offers the 4th breach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310552574.5A CN103528890B (en) | 2013-11-08 | 2013-11-08 | A kind of three-point bending beam test unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310552574.5A CN103528890B (en) | 2013-11-08 | 2013-11-08 | A kind of three-point bending beam test unit |
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| Publication Number | Publication Date |
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| CN103528890A CN103528890A (en) | 2014-01-22 |
| CN103528890B true CN103528890B (en) | 2015-10-21 |
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| CN201310552574.5A Active CN103528890B (en) | 2013-11-08 | 2013-11-08 | A kind of three-point bending beam test unit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237015B (en) * | 2014-10-17 | 2016-08-17 | 清华大学苏州汽车研究院（相城） | The device of high speed dynamic compressive test |
| CN104237016B (en) * | 2014-10-17 | 2016-08-24 | 清华大学苏州汽车研究院（相城） | High speed dynamic compressive test device |
| CN104237014B (en) * | 2014-10-17 | 2017-02-15 | 清华大学苏州汽车研究院（相城） | High-speed dynamic compression test device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2767993Y (en) * | 2004-12-28 | 2006-03-29 | 西北有色金属研究院 | Clamp for testing high temperature tensile property of thin-walled pipe |
| CN201034881Y (en) * | 2007-05-09 | 2008-03-12 | 南京天相软件有限公司 | Material tester automatic loading and unloading control device |
| KR20100072493A (en) * | 2008-12-22 | 2010-07-01 | 이천주 | Multiple measuring point type tension compression testing machine |
| JP2012002790A (en) * | 2010-06-15 | 2012-01-05 | Sanyo Densoku:Kk | Horseshoe type (two division and u-shape) tensile/compressive load meter, pressure receiving half-split chuck, and pressure unit |
| JP5375771B2 (en) * | 2010-08-27 | 2013-12-25 | 株式会社島津製作所 | Axis adjuster for material testing machine |
| CN203551387U (en) * | 2013-11-08 | 2014-04-16 | 清华大学苏州汽车研究院（相城） | Stretching-unloading testing device |
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