CN207991952U - A kind of free sticky experimental rig for rocks in direct tension experiment - Google Patents
A kind of free sticky experimental rig for rocks in direct tension experiment Download PDFInfo
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- CN207991952U CN207991952U CN201721523987.0U CN201721523987U CN207991952U CN 207991952 U CN207991952 U CN 207991952U CN 201721523987 U CN201721523987 U CN 201721523987U CN 207991952 U CN207991952 U CN 207991952U
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- inner support
- pull head
- support arm
- lower plate
- plate
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Abstract
The utility model provides a kind of free sticky experimental rig for rocks in direct tension experiment, including support arm and inner support, support arm and inner support are connected together by inner support pillar mounting hole and inner support pillar；The utility model overcomes since rock brittleness is strong in existing experimental method, when being attached experiment using bonding way would generally because of adhesive strength not enough, bonding agent thickness is irregular or end scaling and leads to the defect of test failure；Brittleness material test specimen is fixedly mounted by upper and lower pedestal, without high-strength glue sticking, when applying pressure, inner support and upper pull head are motionless, support arm moves down, and drives lower pull head to generate uniaxial direct tensile to brittleness material sample, convenient for observation, in drawing process, upper and lower pull head can be by rotating the bias to eliminate in test specimen drawing process by a small margin；Thus pressure can be converted to pulling force, realize the uniaxial direct tensile to the brittleness material test specimen such as rock.
Description
Technical field
The utility model belongs to rock mechanics or field of material testing, more particularly to a kind of suitable for brittleness material test specimen
（Rock, concrete etc.）Conversion equipment is drawn in the free sticky pressing of direct tensile test.
Background technology
Rock, concrete are materials common in infrastructure construction.This two classes material all has good compressive property,
But brittleness is strong, and tensile strength is low, thus, the tensile strength of such material is accurately measured to rationally determining design parameter, to keeping away
The brittleness catastrophic failure for exempting from engineering structure has extremely important effect.
There are two main classes for the test method of measurement Tensile Strength of Rock at present：Indirect method and direct method.Indirect method is one
Under conditions of fixed simplified hypothesis, obtained indirectly by the analysis to test specimen inside stressing conditions using test specimen of different shapes
The tensile strength of measured material, such as Brazilian disc split the law, three-point bending beam method.Such method is although easy to operate, but by
Idealization hypothesis that is complicated in stress, being related to is more thus more sensitive to Specimen Shape, boundary condition, loading form etc.,
The usual variability of test result is larger, and the tensile strength parameter and direct method measured is not consistent.Traditional uniaxial direct tensile method is logical
Often directly testing machine is used to apply pulling force to test specimen, the tensile strength of material is calculated in load when being broken by test specimen.It should
There are the difficult points of two aspects for class method：First, uniform stress is generated on requirement testing section, therefore to test specimen axis and examination
The direction of pull requirement for testing machine application is completely the same, and this point is difficult to accomplish and be difficult to quantitative evaluation；Second is that fragile material is difficult to
Clamping easily generates stress concentration at both ends fixture and test specimen interaction, leads to test failure.
In order to solve difficult point present in direct tensile test, its simplicity, repeatability and accuracy, correlation neck are improved
The researcher in domain proposes a variety of methods.Such as Shandong University Zhang Qiangyong（The patent No.：201310289705.5
201310507021.8）Have developed the rocks in direct tension experimental rig of sleeve bonding, including bonding sleeve, gluing centralising device
With stretching centralising device, the eccentric bias in drawing process during rock sample gluing can be substantially eliminated.Tongji University
Summer is just elementary（The patent No.：200510111986.0）A kind of pressure drawing conversion for rock sample piece direct tensile test is invented
Pressure conversion can be pressure, so as to carry out direct tensile test using forcing press, it is direct to greatly reduce development by device
The difficulty of tension test（Forcing press ownership is significantly higher than Universal motor）, but test specimen still needs to be pasted onto on experimental rig, and it is inconvenient
In directly observing and measuring.
Utility model content
The shortcomings that technical problem to be solved in the utility model is, overcomes the prior art provides a kind of straight for rock
The free sticky experimental rig of tension test is connect, the utility model overcomes since rock brittleness is strong in existing experimental method, using viscous
The mode of connecing when being attached experiment would generally because of adhesive strength not enough, bonding agent thickness is irregular or end scaling and causes to test
The defect of failure；Brittleness material test specimen is fixedly mounted by using upper and lower pedestal in the utility model, is not required to high-strength gluing
It connects, when testing machine applies pressure to device, inner support and motionless by the upper pull head of welded closure, support arm moves down,
It drives lower pull head to generate uniaxial direct tensile to brittleness material sample, convenient for intuitive observation, measures, in drawing process, upper and lower pull head
By rotating the bias to eliminate in test specimen drawing process by a small margin.Thus the pressure of universal testing machine can be converted to drawing
Power realizes the uniaxial direct tensile to the brittleness material test specimen such as rock.
In order to solve the above technical problems, the utility model provides a kind of free sticky experiment for rocks in direct tension experiment
Device, including support arm and inner support, support arm and inner support are socketed in by inner support pillar mounting hole and inner support pillar
Together, support arm includes support arm upper plate disposed in parallel and support arm lower plate, is hung down between support arm upper plate and support arm lower plate
The straight upper and lower plate of support arm is equipped with support arm pillar, and support arm lower plate is equipped with inner support pillar mounting hole, support arm lower plate
The center position of upper surface is equipped with lower pull head installation hole；Inner support includes under inner support upper plate and inner support disposed in parallel
Plate, the upper and lower plate of vertical inner support is equipped with inner support pillar between inner support upper plate and inner support lower plate, inner support pillar with it is interior
Stent strut mounting hole is corresponding, and the center position of inner support upper plate lower surface is equipped with upper pull head installation hole；
Lower pull head is installed in lower pull head installation hole, pull head is installed in upper pull head installation hole, upper pull head passes through
Bolt is fixedly mounted on top base, and lower pull head is mounted by means of bolts on bottom base, is pacified between top base and bottom base
Brittleness material test specimen is filled, both ends and the top base and bottom base contact portion of brittleness material test specimen are equipped with flexible cushion.
The technical solution that the utility model further limits is：
Preferably, aforementioned upper pull head includes that the fixed part of a spheroid connects the peace of an oblate cylinder with lower pull head
Dress portion.
Preferably, be centrosymmetric three support arm branch of distributing installation between aforementioned support arm upper plate and support arm lower plate
Column.
Preferably, be centrosymmetric three inner support branch of distributing installation between aforementioned inner support upper plate and inner support lower plate
Column, three inner support pillars are corresponding with set three inner support pillar mounting holes in support arm lower plate.
Preferably, the fixed part of aforementioned upper pull head is mounted in the upper pull head installation hole of elliposoidal, the fixation of lower pull head
Portion is mounted in the lower pull head installation hole of elliposoidal.Upper pull head and lower pull head can be freely rotated inside hole, to eliminate
It is that may be present to heart deviation, avoid causing to bias.
Preferably, foregoing soft bed course is fabricated from a flexible material, and foregoing soft bed course is made of rubber mass flexible material, with
It is adversely affected caused by eliminating stress concentration.
Further,
The utility model additionally provides a kind of free sticky test method for rocks in direct tension experiment, including following specific
Step：
（One）Support arm lower plate center position is reserved with the lower pull head installation hole of endless totally enclosed elliposoidal, will under
The fixed part of pull head is mounted in it, is similarly mounted on upper pull head endless totally-enclosed at inner support upper plate medial center position
Elliposoidal upper pull head installation hole in；Support arm upper plate and support arm lower plate are welded by support arm pillar later and combined
At an entirety；Inner support pillar passes through the inner support pillar mounting hole in support arm lower plate, then by inner support upper plate and Nei Zhi
Frame lower plate is combined into inner support by the welding of inner support pillar；
（Two）Top base and bottom base are opened, the both ends of the brittleness material test specimen of dumbbell shape are mounted on and are covered with flexible pad
In the upper and lower pedestal of layer, tightens fastening bolt and be fixed；
（Three）Top base and bottom base are bolted on to the mounting portion of upper pull head and lower pull head respectively, and will be above-mentioned
The device integral installation of test specimen is installed on universal testing machine, and by support arm and inner support and the concentric tune of testing machine engine base
It is whole good；
（Four）Pressure is applied to the support arm of the device using universal testing machine, inner support and upper pull head are then fixed,
Support arm moves down, and drives lower pull head to generate uniaxial direct tensile to sample, reaches the test objective to rocks in direct tension.
The utility model has the beneficial effects that：
It in the utility model experiment when installing the brittleness material samples such as rock, is fixed, is not required to height by upper bottom base
Strong rubber is bonded, and when universal testing machine applies pressure to the device, inner support and upper pull head are motionless, and support arm moves down, band
Dynamic lower pull head generates uniaxial direct tensile to sample, and thus the pressure of universal testing machine can be converted to pulling force, realized to rock etc.
The uniaxial direct tensile of brittleness material test specimen.The device and corresponding test method are easy to operate, low to testing machine requirement, convenient for observation
Test, particularly without gluing, avoiding troublesome operation and bonding fracture, end scaling of bonding test specimen etc. easily causes to test
The factor of failure, substantially increases the simplicity and success rate of direct tensile test.
Description of the drawings
Attached drawing 1 is the utility model tension and compression conversion device structure schematic diagram；
Attached drawing 2 is the outline drawing of three pillar support arms；
Attached drawing 3 is the outline drawing of three pillar inner supports；
Attached drawing 4 is the outline drawing of upper pull head；
Attached drawing 5 is the outline drawing of lower pull head；
Attached drawing 6 is the outline drawing of top base；
Attached drawing 7 is the outline drawing of bottom base；
Wherein, 1- support arms, 101- support arm upper plates, 102- support arm lower plates, 103- support arm pillars, 104- inner supports
Pillar mounting hole, pull head installation hole under 105-, the upper pull heads of 2-, 3- brittleness material test specimens, 4- flexible cushions, 5- inner supports,
501- inner support upper plates, 502- inner support lower plates, 503- inner support pillars, the upper pull head installation holes of 504-, 6- top bases, under 7-
Pedestal, pull head under 8-.
Specific implementation mode
Embodiment 1
The present embodiment provides a kind of free sticky experimental rigs for rocks in direct tension experiment, as shown in Figure 1, including outer branch
Frame 1 and inner support 5, as shown in Fig. 2, support arm 1 and inner support 5 pass through inner support pillar mounting hole 104 and inner support pillar 503
It connects together, support arm 1 includes support arm upper plate 101 disposed in parallel and support arm lower plate 102,101 He of support arm upper plate
The upper and lower plate of vertical support arm is equipped with support arm pillar 103 between support arm lower plate 102, and support arm lower plate 102 is equipped with interior branch
The center position of post setting mounting hole 104, the upper surface of support arm lower plate 102 is equipped with lower pull head installation hole 105；Such as Fig. 3
Shown, inner support 5 includes inner support upper plate 501 disposed in parallel and inner support lower plate 502, inner support upper plate 501 and inner support
The upper and lower plate of vertical inner support is equipped with inner support pillar 503 between lower plate 502, and inner support pillar 503 is installed with inner support pillar
Hole 104 is corresponding, and the center position of 501 lower surface of inner support upper plate is equipped with upper pull head installation hole 504；Lower pull head mounting hole
Lower pull head 8 is installed in hole 105, pull head 2 is installed in upper pull head installation hole 504, upper pull head 2 is bolted installation
On top base 6, lower pull head 8 is mounted by means of bolts on bottom base 7, and brittleness material is installed between top base 6 and bottom base 7
Matter test specimen 3, both ends and the top base 6 and 7 contact portion of bottom base of brittleness material test specimen 3 are equipped with flexible cushion 4.
As shown in FIG. 4,5,6, 7, aforementioned upper pull head 2 connects one with the fixed part including a spheroid of lower pull head 8
The mounting portion of oblate cylinder.The distributing installation three that is centrosymmetric between aforementioned support arm upper plate 101 and support arm lower plate 102 is outer
Stent strut 103.Be centrosymmetric three inner supports of distributing installation between aforementioned inner support upper plate 501 and inner support lower plate 502
Pillar 503, three inner support pillars 503 are corresponding with set three inner support pillar mounting holes 104 in support arm lower plate 102.
The fixed part of aforementioned upper pull head 2 is mounted in the upper pull head installation hole 504 of elliposoidal, and the fixed part of lower pull head 8 is mounted on ellipse
In spherical lower pull head installation hole 105.Upper pull head and lower pull head can be freely rotated inside hole, with eliminate there may be
To heart deviation, avoid causing to bias.Foregoing soft bed course 4 is fabricated from a flexible material, and foregoing soft bed course is by rubber mass flexibility
Material is made, adverse effect caused by eliminate stress concentration.
Embodiment 2
Present embodiments provide a kind of free sticky test method for rocks in direct tension experiment, including following specific step
Suddenly：
（One）102 center position of support arm lower plate is reserved with the lower pull head installation hole of endless totally enclosed elliposoidal
105, the fixed part of lower pull head 8 is mounted in it, upper pull head 2 is similarly mounted on 501 medial center position of inner support upper plate
In the upper pull head installation hole 504 of the endless totally enclosed elliposoidal at place；Later by support arm upper plate 101 and support arm lower plate
102 are combined into an entirety by the welding of support arm pillar 103；Inner support pillar 503 passes through the interior branch in support arm lower plate 102
Post setting mounting hole 104, then in inner support upper plate 501 and inner support lower plate 502 be combined by the welding of inner support pillar 503
Holder 5；
（Two）Top base 6 and bottom base 7 are opened, the both ends of the brittleness material test specimen 3 of dumbbell shape are soft mounted on being covered with
In the upper and lower pedestal of property bed course 4, tightens fastening bolt and be fixed；
（Three）Top base 6 and bottom base 7 are bolted on to the mounting portion of upper pull head 2 and lower pull head 8 respectively, and will
The above-mentioned device integral installation for installing test specimen is and same by support arm 1 and inner support 5 and testing machine engine base on universal testing machine
It adjusts in axle center；
（Four）Pressure is applied to the support arm 1 of the device using universal testing machine, inner support 5 and upper pull head 2 are then fixed not
Dynamic, support arm 1 moves down, and drives lower pull head 8 to generate uniaxial direct tensile to sample, reaches the experiment mesh to rocks in direct tension
's.
In the present embodiment when installing the brittleness material samples such as rock, is fixed, be not required to high-strength gluing by upper bottom base
It connects, when universal testing machine applies pressure to the device, inner support and upper pull head are motionless, and support arm moves down, and drive drop-down
Head generates uniaxial direct tensile to sample, thus the pressure of universal testing machine can be converted to pulling force, realizes to the brittleness material such as rock
The uniaxial direct tensile of matter test specimen.The device and corresponding test method are easy to operate, low to testing machine requirement, are tested convenient for observation,
Particularly without gluing, avoiding troublesome operation and bonding fracture, end scaling of bonding test specimen etc. easily leads to test failure
Factor, substantially increase the simplicity and success rate of direct tensile test.
Above example is only to illustrate the technological thought of the utility model, and the protection model of the utility model cannot be limited with this
Enclose, it is every according to the utility model proposes technological thought, any change done on the basis of technical solution each falls within this reality
Within the scope of novel protected.
Claims (6)
1. a kind of free sticky experimental rig for rocks in direct tension experiment, including support arm（1）And inner support（5）, feature
It is, the support arm（1）And inner support（5）Pass through inner support pillar mounting hole（104）With inner support pillar（503）It is socketed in
Together, the support arm（1）Including support arm upper plate disposed in parallel（101）With support arm lower plate（102）, on the support arm
Plate（101）With support arm lower plate（102）Between vertical support arm upper and lower plate support arm pillar is installed（103）, the support arm
Lower plate（102）It is equipped with inner support pillar mounting hole（104）, the support arm lower plate（102）Upper surface center position
Equipped with lower pull head installation hole（105）；The inner support（5）Including inner support upper plate disposed in parallel（501）Under inner support
Plate（502）, the inner support upper plate（501）With inner support lower plate（502）Between vertical inner support upper and lower plate inner support is installed
Pillar（503）, the inner support pillar（503）With inner support pillar mounting hole（104）It is corresponding, the inner support upper plate
（501）The center position of lower surface is equipped with upper pull head installation hole（504）；
The lower pull head installation hole（105）Lower pull head is inside installed（8）, the upper pull head installation hole（504）Inside it is equipped with
Upper pull head（2）, the upper pull head（2）It is mounted by means of bolts on top base（6）On, the lower pull head（8）It is solid by bolt
Dingan County is mounted in bottom base（7）On, the top base（6）And bottom base（7）Between install brittleness material test specimen（3）, the brittleness
Material test specimen（3）Both ends and top base（6）And bottom base（7）Contact portion is equipped with flexible cushion（4）.
2. the free sticky experimental rig according to claim 1 for rocks in direct tension experiment, which is characterized in that on described
Pull head（2）With lower pull head（8）Include that the fixed part of a spheroid connects the mounting portion of an oblate cylinder.
3. the free sticky experimental rig according to claim 1 for rocks in direct tension experiment, which is characterized in that described outer
Holder upper plate（101）With support arm lower plate（102）Between be centrosymmetric three support arm pillars of distributing installation（103）.
4. the free sticky experimental rig according to claim 1 for rocks in direct tension experiment, which is characterized in that in described
Holder upper plate（501）With inner support lower plate（502）Between be centrosymmetric three inner support pillars of distributing installation（503）, three
Inner support pillar（503）With support arm lower plate（102）Upper set three inner support pillar mounting holes（104）It is corresponding.
5. the free sticky experimental rig according to claim 2 for rocks in direct tension experiment, which is characterized in that on described
Pull head（2）Fixed part be mounted on elliposoidal upper pull head installation hole（504）In, lower pull head（8）Fixed part be mounted on it is ellipse
Spherical lower pull head installation hole（105）In.
6. the free sticky experimental rig according to claim 1 for rocks in direct tension experiment, which is characterized in that described soft
Property bed course（4）It is fabricated from a flexible material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721523987.0U CN207991952U (en) | 2017-11-15 | 2017-11-15 | A kind of free sticky experimental rig for rocks in direct tension experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721523987.0U CN207991952U (en) | 2017-11-15 | 2017-11-15 | A kind of free sticky experimental rig for rocks in direct tension experiment |
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| Publication Number | Publication Date |
|---|---|
| CN207991952U true CN207991952U (en) | 2018-10-19 |
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| CN201721523987.0U Expired - Fee Related CN207991952U (en) | 2017-11-15 | 2017-11-15 | A kind of free sticky experimental rig for rocks in direct tension experiment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727503A (en) * | 2017-11-15 | 2018-02-23 | 中国人民解放军陆军工程大学 | A kind of free sticky experimental rig and method for rocks in direct tension experiment |
| CN113188906A (en) * | 2021-04-25 | 2021-07-30 | 重庆科技学院 | Rock uniaxial tension test device and method |
-
2017
- 2017-11-15 CN CN201721523987.0U patent/CN207991952U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727503A (en) * | 2017-11-15 | 2018-02-23 | 中国人民解放军陆军工程大学 | A kind of free sticky experimental rig and method for rocks in direct tension experiment |
| CN113188906A (en) * | 2021-04-25 | 2021-07-30 | 重庆科技学院 | Rock uniaxial tension test device and method |
| CN113188906B (en) * | 2021-04-25 | 2022-05-20 | 重庆科技学院 | Rock uniaxial tension test device and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181019 Termination date: 20211115 |